update dockerclient -> v1.6.6

Makefile: Add CGO_ENABLED=0 to generate statically linked binaries

.circleci/config.yml

@@ -7,7 +7,7 @@ jobs:
     steps:
       - checkout
       - setup_remote_docker:
-          version: 17.05.0-ce
+          version: 19.03.13
       - run: make image
       - deploy: 
           command: |

.gitignore

@@ -1,2 +1,3 @@
 ctop
 .idea
+/vendor/

Dockerfile

@@ -1,16 +1,17 @@
-FROM quay.io/vektorcloud/go:1.9
+FROM quay.io/vektorcloud/go:1.13
 
 RUN apk add --no-cache make
 
-COPY Gopkg.* /go/src/github.com/bcicen/ctop/
-WORKDIR /go/src/github.com/bcicen/ctop/
-RUN dep ensure -vendor-only
+WORKDIR /app
+COPY go.mod .
+RUN go mod download
 
-COPY . /go/src/github.com/bcicen/ctop
+COPY . .
 RUN make build && \
     mkdir -p /go/bin && \
     mv -v ctop /go/bin/
 
 FROM scratch
+ENV TERM=linux
 COPY --from=0 /go/bin/ctop /ctop
 ENTRYPOINT ["/ctop"]

Gopkg.lock

@@ -1,159 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  name = "github.com/Azure/go-ansiterm"
-  packages = [".","winterm"]
-  revision = "fa152c58bc15761d0200cb75fe958b89a9d4888e"
-
-[[projects]]
-  name = "github.com/Microsoft/go-winio"
-  packages = ["."]
-  revision = "fff283ad5116362ca252298cfc9b95828956d85d"
-  version = "v0.3.8"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/Nvveen/Gotty"
-  packages = ["."]
-  revision = "cd527374f1e5bff4938207604a14f2e38a9cf512"
-
-[[projects]]
-  name = "github.com/Sirupsen/logrus"
-  packages = ["."]
-  revision = "26709e2714106fb8ad40b773b711ebce25b78914"
-
-[[projects]]
-  name = "github.com/c9s/goprocinfo"
-  packages = ["linux"]
-  revision = "b34328d6e0cd139894ea7347d2624ccf31fa3c58"
-
-[[projects]]
-  name = "github.com/coreos/go-systemd"
-  packages = ["dbus","util"]
-  revision = "b4a58d95188dd092ae20072bac14cece0e67c388"
-  version = "v4"
-
-[[projects]]
-  name = "github.com/docker/docker"
-  packages = ["api/types","api/types/blkiodev","api/types/container","api/types/filters","api/types/mount","api/types/network","api/types/registry","api/types/strslice","api/types/swarm","api/types/versions","opts","pkg/archive","pkg/fileutils","pkg/homedir","pkg/idtools","pkg/ioutils","pkg/jsonlog","pkg/jsonmessage","pkg/longpath","pkg/mount","pkg/pools","pkg/promise","pkg/stdcopy","pkg/symlink","pkg/system","pkg/term","pkg/term/windows"]
-  revision = "90d35abf7b3535c1c319c872900fbd76374e521c"
-  version = "v17.05.0-ce-rc3"
-
-[[projects]]
-  name = "github.com/docker/go-connections"
-  packages = ["nat"]
-  revision = "a2afab9802043837035592f1c24827fb70766de9"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/docker/go-units"
-  packages = ["."]
-  revision = "0dadbb0345b35ec7ef35e228dabb8de89a65bf52"
-
-[[projects]]
-  name = "github.com/fsouza/go-dockerclient"
-  packages = ["."]
-  revision = "318513eb1ab27495afbc67f671ba1080513d8aa0"
-
-[[projects]]
-  branch = "barchart-numfmt"
-  name = "github.com/gizak/termui"
-  packages = ["."]
-  revision = "ea10e6ccee219e572ffad0ac1909f1a17f6db7d6"
-  source = "https://github.com/bcicen/termui"
-
-[[projects]]
-  name = "github.com/godbus/dbus"
-  packages = ["."]
-  revision = "c7fdd8b5cd55e87b4e1f4e372cdb1db61dd6c66f"
-  version = "v3"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/golang/protobuf"
-  packages = ["proto"]
-  revision = "0a4f71a498b7c4812f64969510bcb4eca251e33a"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/hashicorp/go-cleanhttp"
-  packages = ["."]
-  revision = "3573b8b52aa7b37b9358d966a898feb387f62437"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/jgautheron/codename-generator"
-  packages = ["."]
-  revision = "16d037c7cc3c9b552fe4af9828b7338d752dbaf9"
-
-[[projects]]
-  name = "github.com/maruel/panicparse"
-  packages = ["stack"]
-  revision = "25bcac0d793cf4109483505a0d66e066a3a90a80"
-
-[[projects]]
-  name = "github.com/mattn/go-runewidth"
-  packages = ["."]
-  revision = "14207d285c6c197daabb5c9793d63e7af9ab2d50"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/mitchellh/go-wordwrap"
-  packages = ["."]
-  revision = "ad45545899c7b13c020ea92b2072220eefad42b8"
-
-[[projects]]
-  name = "github.com/nsf/termbox-go"
-  packages = ["."]
-  revision = "91bae1bb5fa9ee504905ecbe7043fa30e92feaa3"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/nu7hatch/gouuid"
-  packages = ["."]
-  revision = "179d4d0c4d8d407a32af483c2354df1d2c91e6c3"
-
-[[projects]]
-  name = "github.com/op/go-logging"
-  packages = ["."]
-  revision = "b2cb9fa56473e98db8caba80237377e83fe44db5"
-  version = "v1"
-
-[[projects]]
-  name = "github.com/opencontainers/runc"
-  packages = ["libcontainer","libcontainer/apparmor","libcontainer/cgroups","libcontainer/cgroups/fs","libcontainer/cgroups/systemd","libcontainer/configs","libcontainer/configs/validate","libcontainer/criurpc","libcontainer/keys","libcontainer/label","libcontainer/seccomp","libcontainer/selinux","libcontainer/stacktrace","libcontainer/system","libcontainer/user","libcontainer/utils"]
-  revision = "baf6536d6259209c3edfa2b22237af82942d3dfa"
-  version = "v0.1.1"
-
-[[projects]]
-  name = "github.com/seccomp/libseccomp-golang"
-  packages = ["."]
-  revision = "1b506fc7c24eec5a3693cdcbed40d9c226cfc6a1"
-
-[[projects]]
-  name = "github.com/syndtr/gocapability"
-  packages = ["capability"]
-  revision = "2c00daeb6c3b45114c80ac44119e7b8801fdd852"
-
-[[projects]]
-  name = "github.com/vishvananda/netlink"
-  packages = [".","nl"]
-  revision = "1e2e08e8a2dcdacaae3f14ac44c5cfa31361f270"
-
-[[projects]]
-  name = "golang.org/x/net"
-  packages = ["context","context/ctxhttp"]
-  revision = "a6577fac2d73be281a500b310739095313165611"
-
-[[projects]]
-  name = "golang.org/x/sys"
-  packages = ["unix","windows"]
-  revision = "99f16d856c9836c42d24e7ab64ea72916925fa97"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "cf4dacc32111b22d72ac23189b826c8316ec265e55bf987338c7a00633af788e"
-  solver-name = "gps-cdcl"
-  solver-version = 1

Gopkg.toml

@@ -1,47 +0,0 @@
-
-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#  name = "github.com/x/y"
-#  version = "2.4.0"
-
-
-[[constraint]]
-  name = "github.com/fsouza/go-dockerclient"
-  revision = "318513eb1ab27495afbc67f671ba1080513d8aa0"
-
-[[constraint]]
-  branch = "barchart-numfmt"
-  name = "github.com/gizak/termui"
-  source = "https://github.com/bcicen/termui"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/jgautheron/codename-generator"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/nu7hatch/gouuid"
-
-[[constraint]]
-  name = "github.com/op/go-logging"
-  version = "1.0.0"
-
-[[constraint]]
-  name = "github.com/opencontainers/runc"
-  version = "0.1.1"

Makefile

@@ -1,27 +1,29 @@
 NAME=ctop
 VERSION=$(shell cat VERSION)
 BUILD=$(shell git rev-parse --short HEAD)
-EXT_LD_FLAGS="-Wl,--allow-multiple-definition"
-LD_FLAGS="-w -X main.version=$(VERSION) -X main.build=$(BUILD) -extldflags=$(EXT_LD_FLAGS)"
+LD_FLAGS="-w -X main.version=$(VERSION) -X main.build=$(BUILD)"
 
 clean:
 	rm -rf _build/ release/
 
 build:
-	dep ensure
+	go mod download
 	CGO_ENABLED=0 go build -tags release -ldflags $(LD_FLAGS) -o ctop
 
-build-dev:
-	go build -ldflags "-w -X main.version=$(VERSION)-dev -X main.build=$(BUILD) -extldflags=$(EXT_LD_FLAGS)"
-
 build-all:
 	mkdir -p _build
-	GOOS=darwin GOARCH=amd64 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-darwin-amd64
-	GOOS=linux  GOARCH=amd64 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-linux-amd64
-	GOOS=linux  GOARCH=arm   go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-linux-arm
-	GOOS=linux  GOARCH=arm64 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-linux-arm64
+	GOOS=darwin  GOARCH=amd64 CGO_ENABLED=0 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-darwin-amd64
+	GOOS=linux   GOARCH=amd64 CGO_ENABLED=0 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-linux-amd64
+	GOOS=linux   GOARCH=arm   CGO_ENABLED=0 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-linux-arm
+	GOOS=linux   GOARCH=arm64 CGO_ENABLED=0 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-linux-arm64
+	GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -tags release -ldflags $(LD_FLAGS) -o _build/ctop-$(VERSION)-windows-amd64
 	cd _build; sha256sum * > sha256sums.txt
 
+run-dev:
+	rm -f ctop.sock ctop
+	go build -ldflags $(LD_FLAGS) -o ctop
+	CTOP_DEBUG=1 ./ctop
+
 image:
 	docker build -t ctop -f Dockerfile .
 

README.md

@@ -9,7 +9,7 @@ Top-like interface for container metrics
 `ctop` provides a concise and condensed overview of real-time metrics for multiple containers:
 <p align="center"><img src="_docs/img/grid.gif" alt="ctop"/></p>
 
-as well as an [single container view][single_view] for inspecting a specific container.
+as well as a [single container view][single_view] for inspecting a specific container.
 
 `ctop` comes with built-in support for Docker and runC; connectors for other container and cluster systems are planned for future releases.
 
@@ -20,7 +20,7 @@ Fetch the [latest release](https://github.com/bcicen/ctop/releases) for your pla
 #### Linux
 
 ```bash
-sudo wget https://github.com/bcicen/ctop/releases/download/v0.7/ctop-0.7-linux-amd64 -O /usr/local/bin/ctop
+sudo wget https://github.com/bcicen/ctop/releases/download/v0.7.4/ctop-0.7.4-linux-amd64 -O /usr/local/bin/ctop
 sudo chmod +x /usr/local/bin/ctop
 ```
 
@@ -31,7 +31,7 @@ brew install ctop
 ```
 or
 ```bash
-sudo curl -Lo /usr/local/bin/ctop https://github.com/bcicen/ctop/releases/download/v0.7/ctop-0.7-darwin-amd64
+sudo curl -Lo /usr/local/bin/ctop https://github.com/bcicen/ctop/releases/download/v0.7.4/ctop-0.7.4-darwin-amd64
 sudo chmod +x /usr/local/bin/ctop
 ```
 
@@ -40,7 +40,7 @@ sudo chmod +x /usr/local/bin/ctop
 ```bash
 docker run --rm -ti \
   --name=ctop \
-  -v /var/run/docker.sock:/var/run/docker.sock \
+  --volume /var/run/docker.sock:/var/run/docker.sock:ro \
   quay.io/vektorlab/ctop:latest
 ```
 
@@ -56,36 +56,41 @@ Build steps can be found [here][build].
 
 ### Config file
 
-While running, use `S` to save the current filters, sort field, and other options to a default config path. These settings will be loaded and applied the next time `ctop` is started.
+While running, use `S` to save the current filters, sort field, and other options to a default config path (`~/.config/ctop/config` on XDG systems, else `~/.ctop`).
+
+Config file values will be loaded and applied the next time `ctop` is started.
 
 ### Options
 
 Option | Description
 --- | ---
--a	| show active containers only
--f <string> | set an initial filter string
--h	| display help dialog
--i  | invert default colors
--r	| reverse container sort order
--s  | select initial container sort field
--scale-cpu	| show cpu as % of system total
--v	| output version information and exit
+`-a`	| show active containers only
+`-f <string>` | set an initial filter string
+`-h`	| display help dialog
+`-i`  | invert default colors
+`-r`	| reverse container sort order
+`-s`  | select initial container sort field
+`-scale-cpu`	| show cpu as % of system total
+`-v`	| output version information and exit
+`-shell` | exec shell to use (default: sh)
 
 ### Keybindings
 
-Key | Action
---- | ---
-<enter> | Open container menu
-a | Toggle display of all (running and non-running) containers
-f | Filter displayed containers (`esc` to clear when open)
-H | Toggle ctop header
-h | Open help dialog
-s | Select container sort field
-r | Reverse container sort order
-o | Open single view
-l | View container logs (`t` to toggle timestamp when open)
-S | Save current configuration to file
-q | Quit ctop
+|           Key            | Action                                                     |
+| :----------------------: | ---------------------------------------------------------- |
+| <kbd>&lt;ENTER&gt;</kbd> | Open container menu                                        |
+|       <kbd>a</kbd>       | Toggle display of all (running and non-running) containers |
+|       <kbd>f</kbd>       | Filter displayed containers (`esc` to clear when open)     |
+|       <kbd>H</kbd>       | Toggle ctop header                                         |
+|       <kbd>h</kbd>       | Open help dialog                                           |
+|       <kbd>s</kbd>       | Select container sort field                                |
+|       <kbd>r</kbd>       | Reverse container sort order                               |
+|       <kbd>o</kbd>       | Open single view                                           |
+|       <kbd>l</kbd>       | View container logs (`t` to toggle timestamp when open)    |
+|       <kbd>e</kbd>       | Exec Shell                                                 |
+|       <kbd>c</kbd>       | Configure columns                                          |
+|       <kbd>S</kbd>       | Save current configuration to file                         |
+|       <kbd>q</kbd>       | Quit ctop                                                  |
 
 [build]: _docs/build.md
 [connectors]: _docs/connectors.md

VERSION

@@ -1 +1 @@
-0.7
+0.7.4

_docs/build.md

@@ -1,10 +1,8 @@
 # Build
 
-To build `ctop` from source, ensure you have [dep](https://github.com/golang/dep) installed and run:
+To build `ctop` from source, simply clone the repo and run:
 
 ```bash
-go get github.com/bcicen/ctop && \
-cd $GOPATH/src/github.com/bcicen/ctop && \
 make build
 ```
 
@@ -16,5 +14,8 @@ make image
 Now you can run your local image:
 
 ```bash
-docker run -ti --name ctop --rm -v /var/run/docker.sock:/var/run/docker.sock ctop
+docker run --rm -ti \
+  --name ctop \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  ctop:latest
 ```

_docs/connectors.md

@@ -1,4 +1,4 @@
-# connectors
+# Connectors
 
 `ctop` comes with the below native connectors, enabled via the `--connector` option.
 

_docs/status.md

@@ -0,0 +1,30 @@
+# Status Indicator
+
+The `ctop` grid view provides a compact status indicator to convey container state
+
+<img width="200px" src="img/status.png" alt="ctop"/>
+
+### Status
+
+<span align="center">
+
+Appearance | Description
+--- | ---
+red | container is stopped
+green | container is running
+▮▮ | container is paused
+
+</span>
+
+### Health
+If the container is configured with a health check, a `+` will appear next to the indicator
+
+<span align="center">
+
+Appearance | Description
+--- | ---
+red | health check in failed state
+yellow | health check in starting state
+green | health check in OK state
+
+</span>

colors.go

@@ -52,7 +52,7 @@ var ColorMap = map[string]ui.Attribute{
 
 func InvertColorMap() {
 	re := regexp.MustCompile(".*.fg")
-	for k, _ := range ColorMap {
+	for k := range ColorMap {
 		if re.FindAllString(k, 1) != nil {
 			ColorMap[k] = ui.ColorBlack
 		}

config/columns.go

@@ -0,0 +1,145 @@
+package config
+
+import (
+	"strings"
+)
+
+// defaults
+var defaultColumns = []Column{
+	Column{
+		Name:    "status",
+		Label:   "Status Indicator",
+		Enabled: true,
+	},
+	Column{
+		Name:    "name",
+		Label:   "Container Name",
+		Enabled: true,
+	},
+	Column{
+		Name:    "id",
+		Label:   "Container ID",
+		Enabled: true,
+	},
+	Column{
+		Name:    "cpu",
+		Label:   "CPU Usage",
+		Enabled: true,
+	},
+	Column{
+		Name:    "mem",
+		Label:   "Memory Usage",
+		Enabled: true,
+	},
+	Column{
+		Name:    "net",
+		Label:   "Network RX/TX",
+		Enabled: true,
+	},
+	Column{
+		Name:    "io",
+		Label:   "Disk IO Read/Write",
+		Enabled: true,
+	},
+	Column{
+		Name:    "pids",
+		Label:   "Container PID Count",
+		Enabled: true,
+	},
+}
+
+type Column struct {
+	Name    string
+	Label   string
+	Enabled bool
+}
+
+// ColumnsString returns an ordered and comma-delimited string of currently enabled Columns
+func ColumnsString() string { return strings.Join(EnabledColumns(), ",") }
+
+// EnabledColumns returns an ordered array of enabled column names
+func EnabledColumns() (a []string) {
+	lock.RLock()
+	defer lock.RUnlock()
+	for _, col := range GlobalColumns {
+		if col.Enabled {
+			a = append(a, col.Name)
+		}
+	}
+	return a
+}
+
+// ColumnToggle toggles the enabled status of a given column name
+func ColumnToggle(name string) {
+	col := GlobalColumns[colIndex(name)]
+	col.Enabled = !col.Enabled
+	log.Noticef("config change [column-%s]: %t -> %t", col.Name, !col.Enabled, col.Enabled)
+}
+
+// ColumnLeft moves the column with given name up one position, if possible
+func ColumnLeft(name string) {
+	idx := colIndex(name)
+	if idx > 0 {
+		swapCols(idx, idx-1)
+	}
+}
+
+// ColumnRight moves the column with given name up one position, if possible
+func ColumnRight(name string) {
+	idx := colIndex(name)
+	if idx < len(GlobalColumns)-1 {
+		swapCols(idx, idx+1)
+	}
+}
+
+// Set Column order and enabled status from one or more provided Column names
+func SetColumns(names []string) {
+	var (
+		n          int
+		curColStr  = ColumnsString()
+		newColumns = make([]*Column, len(GlobalColumns))
+	)
+
+	lock.Lock()
+
+	// add enabled columns by name
+	for _, name := range names {
+		newColumns[n] = popColumn(name)
+		newColumns[n].Enabled = true
+		n++
+	}
+
+	// extend with omitted columns as disabled
+	for _, col := range GlobalColumns {
+		newColumns[n] = col
+		newColumns[n].Enabled = false
+		n++
+	}
+
+	GlobalColumns = newColumns
+	lock.Unlock()
+
+	log.Noticef("config change [columns]: %s -> %s", curColStr, ColumnsString())
+}
+
+func swapCols(i, j int) { GlobalColumns[i], GlobalColumns[j] = GlobalColumns[j], GlobalColumns[i] }
+
+func popColumn(name string) *Column {
+	idx := colIndex(name)
+	if idx < 0 {
+		panic("no such column name: " + name)
+	}
+	col := GlobalColumns[idx]
+	GlobalColumns = append(GlobalColumns[:idx], GlobalColumns[idx+1:]...)
+	return col
+}
+
+// return index of column with given name, if any
+func colIndex(name string) int {
+	for n, c := range GlobalColumns {
+		if c.Name == name {
+			return n
+		}
+	}
+	return -1
+}

config/file.go

@@ -13,27 +13,36 @@ var (
 	xdgRe = regexp.MustCompile("^XDG_*")
 )
 
-type ConfigFile struct {
+type File struct {
 	Options map[string]string `toml:"options"`
 	Toggles map[string]bool   `toml:"toggles"`
 }
 
-func exportConfig() ConfigFile {
-	c := ConfigFile{
+func exportConfig() File {
+	// update columns param from working config
+	Update("columns", ColumnsString())
+
+	lock.RLock()
+	defer lock.RUnlock()
+
+	c := File{
 		Options: make(map[string]string),
 		Toggles: make(map[string]bool),
 	}
+
 	for _, p := range GlobalParams {
 		c.Options[p.Key] = p.Val
 	}
 	for _, sw := range GlobalSwitches {
 		c.Toggles[sw.Key] = sw.Val
 	}
+
 	return c
 }
 
+//
 func Read() error {
-	var config ConfigFile
+	var config File
 
 	path, err := getConfigPath()
 	if err != nil {
@@ -43,13 +52,26 @@ func Read() error {
 	if _, err := toml.DecodeFile(path, &config); err != nil {
 		return err
 	}
-
 	for k, v := range config.Options {
 		Update(k, v)
 	}
 	for k, v := range config.Toggles {
 		UpdateSwitch(k, v)
 	}
+
+	// set working column config, if provided
+	colStr := GetVal("columns")
+	if len(colStr) > 0 {
+		var colNames []string
+		for _, s := range strings.Split(colStr, ",") {
+			s = strings.TrimSpace(s)
+			if s != "" {
+				colNames = append(colNames, strings.TrimSpace(s))
+			}
+		}
+		SetColumns(colNames)
+	}
+
 	return nil
 }
 
@@ -68,6 +90,13 @@ func Write() (path string, err error) {
 		}
 	}
 
+	// remove prior to writing new file
+	if err := os.Remove(path); err != nil {
+		if !os.IsNotExist(err) {
+			return path, err
+		}
+	}
+
 	file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0644)
 	if err != nil {
 		return path, fmt.Errorf("failed to open config for writing: %s", err)

config/main.go

@@ -3,6 +3,7 @@ package config
 import (
 	"fmt"
 	"os"
+	"sync"
 
 	"github.com/bcicen/ctop/logging"
 )
@@ -10,17 +11,24 @@ import (
 var (
 	GlobalParams   []*Param
 	GlobalSwitches []*Switch
+	GlobalColumns  []*Column
+	lock           sync.RWMutex
 	log            = logging.Init()
 )
 
 func Init() {
-	for _, p := range params {
+	for _, p := range defaultParams {
 		GlobalParams = append(GlobalParams, p)
-		log.Infof("loaded config param: %s: %s", quote(p.Key), quote(p.Val))
+		log.Infof("loaded default config param [%s]: %s", quote(p.Key), quote(p.Val))
 	}
-	for _, s := range switches {
+	for _, s := range defaultSwitches {
 		GlobalSwitches = append(GlobalSwitches, s)
-		log.Infof("loaded config switch: %s: %t", quote(s.Key), s.Val)
+		log.Infof("loaded default config switch [%s]: %t", quote(s.Key), s.Val)
+	}
+	for _, c := range defaultColumns {
+		x := c
+		GlobalColumns = append(GlobalColumns, &x)
+		log.Infof("loaded default widget config [%s]: %t", quote(x.Name), x.Enabled)
 	}
 }
 

config/param.go

@@ -1,7 +1,7 @@
 package config
 
 // defaults
-var params = []*Param{
+var defaultParams = []*Param{
 	&Param{
 		Key:   "filterStr",
 		Val:   "",
@@ -12,6 +12,16 @@ var params = []*Param{
 		Val:   "state",
 		Label: "Container Sort Field",
 	},
+	&Param{
+		Key:   "shell",
+		Val:   "sh",
+		Label: "Shell",
+	},
+	&Param{
+		Key:   "columns",
+		Val:   "status,name,id,cpu,mem,net,io,pids",
+		Label: "Enabled Columns",
+	},
 }
 
 type Param struct {
@@ -22,6 +32,9 @@ type Param struct {
 
 // Get Param by key
 func Get(k string) *Param {
+	lock.RLock()
+	defer lock.RUnlock()
+
 	for _, p := range GlobalParams {
 		if p.Key == k {
 			return p
@@ -30,7 +43,7 @@ func Get(k string) *Param {
 	return &Param{} // default
 }
 
-// Get Param value by key
+// GetVal gets Param value by key
 func GetVal(k string) string {
 	return Get(k).Val
 }
@@ -38,7 +51,10 @@ func GetVal(k string) string {
 // Set param value
 func Update(k, v string) {
 	p := Get(k)
-	log.Noticef("config change: %s: %s -> %s", k, quote(p.Val), quote(v))
+	log.Noticef("config change [%s]: %s -> %s", k, quote(p.Val), quote(v))
+
+	lock.Lock()
+	defer lock.Unlock()
 	p.Val = v
 	// log.Errorf("ignoring update for non-existant parameter: %s", k)
 }

config/switch.go

@@ -1,21 +1,26 @@
 package config
 
 // defaults
-var switches = []*Switch{
+var defaultSwitches = []*Switch{
 	&Switch{
 		Key:   "sortReversed",
 		Val:   false,
-		Label: "Reverse Sort Order",
+		Label: "Reverse sort order",
 	},
 	&Switch{
 		Key:   "allContainers",
 		Val:   true,
-		Label: "Show All Containers",
+		Label: "Show all containers",
+	},
+	&Switch{
+		Key:   "fullRowCursor",
+		Val:   true,
+		Label: "Highlight entire cursor row (vs. name only)",
 	},
 	&Switch{
 		Key:   "enableHeader",
 		Val:   true,
-		Label: "Enable Status Header",
+		Label: "Enable status header",
 	},
 	&Switch{
 		Key:   "scaleCpu",
@@ -30,8 +35,11 @@ type Switch struct {
 	Label string
 }
 
-// Return Switch by key
+// GetSwitch returns Switch by key
 func GetSwitch(k string) *Switch {
+	lock.RLock()
+	defer lock.RUnlock()
+
 	for _, sw := range GlobalSwitches {
 		if sw.Key == k {
 			return sw
@@ -40,15 +48,19 @@ func GetSwitch(k string) *Switch {
 	return &Switch{} // default
 }
 
-// Return Switch value by key
+// GetSwitchVal returns Switch value by key
 func GetSwitchVal(k string) bool {
 	return GetSwitch(k).Val
 }
 
 func UpdateSwitch(k string, val bool) {
 	sw := GetSwitch(k)
+
+	lock.Lock()
+	defer lock.Unlock()
+
 	if sw.Val != val {
-		log.Noticef("config change: %s: %t -> %t", k, sw.Val, val)
+		log.Noticef("config change [%s]: %t -> %t", k, sw.Val, val)
 		sw.Val = val
 	}
 }
@@ -56,8 +68,11 @@ func UpdateSwitch(k string, val bool) {
 // Toggle a boolean switch
 func Toggle(k string) {
 	sw := GetSwitch(k)
-	newVal := sw.Val != true
-	log.Noticef("config change: %s: %t -> %t", k, sw.Val, newVal)
-	sw.Val = newVal
+
+	lock.Lock()
+	defer lock.Unlock()
+
+	sw.Val = !sw.Val
+	log.Noticef("config change [%s]: %t -> %t", k, !sw.Val, sw.Val)
 	//log.Errorf("ignoring toggle for non-existant switch: %s", k)
 }

connector/collector/docker.go

@@ -114,10 +114,10 @@ func (c *Docker) ReadIO(stats *api.Stats) {
 	var read, write int64
 	for _, blk := range stats.BlkioStats.IOServiceBytesRecursive {
 		if blk.Op == "Read" {
-			read = int64(blk.Value)
+			read += int64(blk.Value)
 		}
 		if blk.Op == "Write" {
-			write = int64(blk.Value)
+			write += int64(blk.Value)
 		}
 	}
 	c.IOBytesRead, c.IOBytesWrite = read, write

connector/collector/docker_logs.go

@@ -34,12 +34,13 @@ func (l *DockerLogs) Stream() chan models.Log {
 		Context:      ctx,
 		Container:    l.id,
 		OutputStream: w,
-		ErrorStream:  w,
-		Stdout:       true,
-		Stderr:       true,
-		Tail:         "10",
-		Follow:       true,
-		Timestamps:   true,
+		//ErrorStream:  w,
+		Stdout:      true,
+		Stderr:      true,
+		Tail:        "20",
+		Follow:      true,
+		Timestamps:  true,
+		RawTerminal: true,
 	}
 
 	// read io pipe into channel
@@ -48,7 +49,7 @@ func (l *DockerLogs) Stream() chan models.Log {
 		for scanner.Scan() {
 			parts := strings.Split(scanner.Text(), " ")
 			ts := l.parseTime(parts[0])
-			logCh <- models.Log{ts, strings.Join(parts[1:], " ")}
+			logCh <- models.Log{Timestamp: ts, Message: strings.Join(parts[1:], " ")}
 		}
 	}()
 
@@ -62,10 +63,8 @@ func (l *DockerLogs) Stream() chan models.Log {
 	}()
 
 	go func() {
-		select {
-		case <-l.done:
-			cancel()
-		}
+		<-l.done
+		cancel()
 	}()
 
 	log.Infof("log reader started for container: %s", l.id)
@@ -76,9 +75,25 @@ func (l *DockerLogs) Stop() { l.done <- true }
 
 func (l *DockerLogs) parseTime(s string) time.Time {
 	ts, err := time.Parse("2006-01-02T15:04:05.000000000Z", s)
-	if err != nil {
-		log.Errorf("failed to parse container log: %s", err)
-		ts = time.Now()
+	if err == nil {
+		return ts
 	}
-	return ts
+
+	ts, err2 := time.Parse("2006-01-02T15:04:05.000000000Z", l.stripPfx(s))
+	if err2 == nil {
+		return ts
+	}
+
+	log.Errorf("failed to parse container log: %s", err)
+	log.Errorf("failed to parse container log2: %s", err2)
+	return time.Now()
+}
+
+// attempt to strip message header prefix from a given raw docker log string
+func (l *DockerLogs) stripPfx(s string) string {
+	b := []byte(s)
+	if len(b) > 8 {
+		return string(b[8:])
+	}
+	return s
 }

connector/collector/mock_logs.go

@@ -20,7 +20,7 @@ func (l *MockLogs) Stream() chan models.Log {
 			case <-l.done:
 				break
 			default:
-				logCh <- models.Log{time.Now(), mockLog}
+				logCh <- models.Log{Timestamp: time.Now(), Message: mockLog}
 				time.Sleep(250 * time.Millisecond)
 			}
 		}

connector/collector/proc.go

@@ -1,16 +1,17 @@
-// +build !darwin
+// +build linux
 
 package collector
 
 import (
 	linuxproc "github.com/c9s/goprocinfo/linux"
-	"github.com/opencontainers/runc/libcontainer/system"
 )
 
 var sysMemTotal = getSysMemTotal()
-var clockTicksPerSecond = uint64(system.GetClockTicks())
 
-const nanoSecondsPerSecond = 1e9
+const (
+	clockTicksPerSecond  uint64 = 100
+	nanoSecondsPerSecond        = 1e9
+)
 
 func getSysMemTotal() int64 {
 	stat, err := linuxproc.ReadMemInfo("/proc/meminfo")

connector/collector/runc.go

@@ -1,14 +1,16 @@
-// +build !darwin
+// +build linux
 
 package collector
 
 import (
 	"time"
 
-	"github.com/bcicen/ctop/config"
-	"github.com/bcicen/ctop/models"
 	"github.com/opencontainers/runc/libcontainer"
 	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/types"
+
+	"github.com/bcicen/ctop/config"
+	"github.com/bcicen/ctop/models"
 )
 
 // Runc collector
@@ -112,7 +114,7 @@ func (c *Runc) ReadMem(stats *cgroups.Stats) {
 	c.MemPercent = percent(float64(c.MemUsage), float64(c.MemLimit))
 }
 
-func (c *Runc) ReadNet(interfaces []*libcontainer.NetworkInterface) {
+func (c *Runc) ReadNet(interfaces []*types.NetworkInterface) {
 	var rx, tx int64
 	for _, network := range interfaces {
 		rx += int64(network.RxBytes)

connector/docker.go

@@ -11,31 +11,51 @@ import (
 	api "github.com/fsouza/go-dockerclient"
 )
 
+func init() { enabled["docker"] = NewDocker }
+
 type Docker struct {
 	client       *api.Client
 	containers   map[string]*container.Container
 	needsRefresh chan string // container IDs requiring refresh
+	closed       chan struct{}
 	lock         sync.RWMutex
 }
 
-func NewDocker() Connector {
+func NewDocker() (Connector, error) {
 	// init docker client
 	client, err := api.NewClientFromEnv()
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
 	cm := &Docker{
 		client:       client,
 		containers:   make(map[string]*container.Container),
 		needsRefresh: make(chan string, 60),
+		closed:       make(chan struct{}),
 		lock:         sync.RWMutex{},
 	}
+
+	// query info as pre-flight healthcheck
+	info, err := client.Info()
+	if err != nil {
+		return nil, err
+	}
+
+	log.Debugf("docker-connector ID: %s", info.ID)
+	log.Debugf("docker-connector Driver: %s", info.Driver)
+	log.Debugf("docker-connector Images: %d", info.Images)
+	log.Debugf("docker-connector Name: %s", info.Name)
+	log.Debugf("docker-connector ServerVersion: %s", info.ServerVersion)
+
 	go cm.Loop()
 	cm.refreshAll()
 	go cm.watchEvents()
-	return cm
+	return cm, nil
 }
 
+// Docker implements Connector
+func (cm *Docker) Wait() struct{} { return <-cm.closed }
+
 // Docker events watcher
 func (cm *Docker) watchEvents() {
 	log.Info("docker event listener starting")
@@ -58,6 +78,8 @@ func (cm *Docker) watchEvents() {
 			cm.delByID(e.ID)
 		}
 	}
+	log.Info("docker event listener exited")
+	close(cm.closed)
 }
 
 func portsFormat(ports map[api.Port][]api.PortBinding) string {
@@ -78,6 +100,17 @@ func portsFormat(ports map[api.Port][]api.PortBinding) string {
 	return strings.Join(append(exposed, published...), "\n")
 }
 
+func ipsFormat(networks map[string]api.ContainerNetwork) string {
+	var ips []string
+
+	for k, v := range networks {
+		s := fmt.Sprintf("%s:%s", k, v.IPAddress)
+		ips = append(ips, s)
+	}
+
+	return strings.Join(ips, "\n")
+}
+
 func (cm *Docker) refresh(c *container.Container) {
 	insp := cm.inspect(c.Id)
 	// remove container if no longer exists
@@ -87,17 +120,21 @@ func (cm *Docker) refresh(c *container.Container) {
 	}
 	c.SetMeta("name", shortName(insp.Name))
 	c.SetMeta("image", insp.Config.Image)
+	c.SetMeta("IPs", ipsFormat(insp.NetworkSettings.Networks))
 	c.SetMeta("ports", portsFormat(insp.NetworkSettings.Ports))
 	c.SetMeta("created", insp.Created.Format("Mon Jan 2 15:04:05 2006"))
 	c.SetMeta("health", insp.State.Health.Status)
+	for _, env := range insp.Config.Env {
+		c.SetMeta("[ENV-VAR]", env)
+	}
 	c.SetState(insp.State.Status)
 }
 
 func (cm *Docker) inspect(id string) *api.Container {
 	c, err := cm.client.InspectContainer(id)
 	if err != nil {
-		if _, ok := err.(*api.NoSuchContainer); ok == false {
-			log.Errorf(err.Error())
+		if _, ok := err.(*api.NoSuchContainer); !ok {
+			log.Errorf("%s (%T)", err.Error(), err)
 		}
 	}
 	return c
@@ -108,7 +145,8 @@ func (cm *Docker) refreshAll() {
 	opts := api.ListContainersOptions{All: true}
 	allContainers, err := cm.client.ListContainers(opts)
 	if err != nil {
-		panic(err)
+		log.Errorf("%s (%T)", err.Error(), err)
+		return
 	}
 
 	for _, i := range allContainers {
@@ -120,13 +158,18 @@ func (cm *Docker) refreshAll() {
 }
 
 func (cm *Docker) Loop() {
-	for id := range cm.needsRefresh {
-		c := cm.MustGet(id)
-		cm.refresh(c)
+	for {
+		select {
+		case id := <-cm.needsRefresh:
+			c := cm.MustGet(id)
+			cm.refresh(c)
+		case <-cm.closed:
+			return
+		}
 	}
 }
 
-// Get a single container, creating one anew if not existing
+// MustGet gets a single container, creating one anew if not existing
 func (cm *Docker) MustGet(id string) *container.Container {
 	c, ok := cm.Get(id)
 	// append container struct for new containers
@@ -144,7 +187,7 @@ func (cm *Docker) MustGet(id string) *container.Container {
 	return c
 }
 
-// Get a single container, by ID
+// Docker implements Connector
 func (cm *Docker) Get(id string) (*container.Container, bool) {
 	cm.lock.Lock()
 	c, ok := cm.containers[id]
@@ -160,7 +203,7 @@ func (cm *Docker) delByID(id string) {
 	log.Infof("removed dead container: %s", id)
 }
 
-// Return array of all containers, sorted by field
+// Docker implements Connector
 func (cm *Docker) All() (containers container.Containers) {
 	cm.lock.Lock()
 	for _, c := range cm.containers {

connector/enabled_darwin.go

@@ -1,7 +0,0 @@
-// +build !linux
-
-package connector
-
-var enabled = map[string]func() Connector{
-	"docker": NewDocker,
-}

connector/enabled_linux.go

@@ -1,8 +0,0 @@
-// +build !darwin
-
-package connector
-
-var enabled = map[string]func() Connector{
-	"docker": NewDocker,
-	"runc":   NewRunc,
-}

connector/main.go

@@ -2,25 +2,103 @@ package connector
 
 import (
 	"fmt"
+	"sort"
+	"sync"
+	"time"
 
 	"github.com/bcicen/ctop/container"
 	"github.com/bcicen/ctop/logging"
 )
 
-var log = logging.Init()
+var (
+	log     = logging.Init()
+	enabled = make(map[string]ConnectorFn)
+)
 
-func ByName(s string) (Connector, error) {
-	if _, ok := enabled[s]; !ok {
-		msg := fmt.Sprintf("invalid connector type \"%s\"\nconnector must be one of:", s)
-		for k, _ := range enabled {
-			msg += fmt.Sprintf("\n  %s", k)
-		}
-		return nil, fmt.Errorf(msg)
-	}
-	return enabled[s](), nil
-}
+type ConnectorFn func() (Connector, error)
 
 type Connector interface {
+	// All returns a pre-sorted container.Containers of all discovered containers
 	All() container.Containers
+	// Get returns a single container.Container by ID
 	Get(string) (*container.Container, bool)
+	// Wait blocks until the underlying connection is lost
+	Wait() struct{}
+}
+
+// ConnectorSuper provides initial connection and retry on failure for
+// an undlerying Connector type
+type ConnectorSuper struct {
+	conn   Connector
+	connFn ConnectorFn
+	err    error
+	lock   sync.RWMutex
+}
+
+func NewConnectorSuper(connFn ConnectorFn) *ConnectorSuper {
+	cs := &ConnectorSuper{
+		connFn: connFn,
+		err:    fmt.Errorf("connecting..."),
+	}
+	go cs.loop()
+	return cs
+}
+
+// Get returns the underlying Connector, or nil and an error
+// if the Connector is not yet initialized or is disconnected.
+func (cs *ConnectorSuper) Get() (Connector, error) {
+	cs.lock.RLock()
+	defer cs.lock.RUnlock()
+	if cs.err != nil {
+		return nil, cs.err
+	}
+	return cs.conn, nil
+}
+
+func (cs *ConnectorSuper) setError(err error) {
+	cs.lock.Lock()
+	defer cs.lock.Unlock()
+	cs.err = err
+}
+
+func (cs *ConnectorSuper) loop() {
+	const interval = 3
+	for {
+		log.Infof("initializing connector")
+
+		conn, err := cs.connFn()
+		if err != nil {
+			cs.setError(err)
+			log.Errorf("failed to initialize connector: %s (%T)", err, err)
+			log.Errorf("retrying in %ds", interval)
+			time.Sleep(interval * time.Second)
+		} else {
+			cs.conn = conn
+			cs.setError(nil)
+			log.Infof("successfully initialized connector")
+
+			// wait until connection closed
+			cs.conn.Wait()
+			cs.setError(fmt.Errorf("attempting to reconnect..."))
+			log.Infof("connector closed")
+		}
+	}
+}
+
+// Enabled returns names for all enabled connectors on the current platform
+func Enabled() (a []string) {
+	for k, _ := range enabled {
+		a = append(a, k)
+	}
+	sort.Strings(a)
+	return a
+}
+
+// ByName returns a ConnectorSuper for a given name, or error if the connector
+// does not exists on the current platform
+func ByName(s string) (*ConnectorSuper, error) {
+	if cfn, ok := enabled[s]; ok {
+		return NewConnectorSuper(cfn), nil
+	}
+	return nil, fmt.Errorf("invalid connector type \"%s\"", s)
 }

connector/manager/docker.go

@@ -3,6 +3,9 @@ package manager
 import (
 	"fmt"
 	api "github.com/fsouza/go-dockerclient"
+	"github.com/pkg/errors"
+	"io"
+	"os"
 )
 
 type Docker struct {
@@ -17,6 +20,88 @@ func NewDocker(client *api.Client, id string) *Docker {
 	}
 }
 
+// Do not allow to close reader (i.e. /dev/stdin which docker client tries to close after command execution)
+type noClosableReader struct {
+	io.Reader
+}
+
+func (w *noClosableReader) Read(p []byte) (n int, err error) {
+	return w.Reader.Read(p)
+}
+
+const (
+	STDIN  = 0
+	STDOUT = 1
+	STDERR = 2
+)
+
+var wrongFrameFormat = errors.New("Wrong frame format")
+
+// A frame has a Header and a Payload
+// Header: [8]byte{STREAM_TYPE, 0, 0, 0, SIZE1, SIZE2, SIZE3, SIZE4}
+// STREAM_TYPE can be:
+//    0: stdin (is written on stdout)
+//    1: stdout
+//    2: stderr
+// SIZE1, SIZE2, SIZE3, SIZE4 are the four bytes of the uint32 size encoded as big endian.
+// But we don't use size, because we don't need to find the end of frame.
+type frameWriter struct {
+	stdout io.Writer
+	stderr io.Writer
+	stdin  io.Writer
+}
+
+func (w *frameWriter) Write(p []byte) (n int, err error) {
+	// drop initial empty frames
+	if len(p) == 0 {
+		return 0, nil
+	}
+
+	if len(p) > 8 {
+		var targetWriter io.Writer
+		switch p[0] {
+		case STDIN:
+			targetWriter = w.stdin
+			break
+		case STDOUT:
+			targetWriter = w.stdout
+			break
+		case STDERR:
+			targetWriter = w.stderr
+			break
+		default:
+			return 0, wrongFrameFormat
+		}
+
+		n, err := targetWriter.Write(p[8:])
+		return n + 8, err
+	}
+
+	return 0, wrongFrameFormat
+}
+
+func (dc *Docker) Exec(cmd []string) error {
+	execCmd, err := dc.client.CreateExec(api.CreateExecOptions{
+		AttachStdin:  true,
+		AttachStdout: true,
+		AttachStderr: true,
+		Cmd:          cmd,
+		Container:    dc.id,
+		Tty:          true,
+	})
+
+	if err != nil {
+		return err
+	}
+
+	return dc.client.StartExec(execCmd.ID, api.StartExecOptions{
+		InputStream:  &noClosableReader{os.Stdin},
+		OutputStream: &frameWriter{os.Stdout, os.Stderr, os.Stdin},
+		ErrorStream:  os.Stderr,
+		RawTerminal:  true,
+	})
+}
+
 func (dc *Docker) Start() error {
 	c, err := dc.client.InspectContainer(dc.id)
 	if err != nil {
@@ -42,3 +127,24 @@ func (dc *Docker) Remove() error {
 	}
 	return nil
 }
+
+func (dc *Docker) Pause() error {
+	if err := dc.client.PauseContainer(dc.id); err != nil {
+		return fmt.Errorf("cannot pause container: %v", err)
+	}
+	return nil
+}
+
+func (dc *Docker) Unpause() error {
+	if err := dc.client.UnpauseContainer(dc.id); err != nil {
+		return fmt.Errorf("cannot unpause container: %v", err)
+	}
+	return nil
+}
+
+func (dc *Docker) Restart() error {
+	if err := dc.client.RestartContainer(dc.id, 3); err != nil {
+		return fmt.Errorf("cannot restart container: %v", err)
+	}
+	return nil
+}

connector/manager/main.go

@@ -1,7 +1,15 @@
 package manager
 
+import "errors"
+
+var ActionNotImplErr = errors.New("action not implemented")
+
 type Manager interface {
 	Start() error
 	Stop() error
 	Remove() error
+	Pause() error
+	Unpause() error
+	Restart() error
+	Exec(cmd []string) error
 }

connector/manager/mock.go

@@ -7,13 +7,29 @@ func NewMock() *Mock {
 }
 
 func (m *Mock) Start() error {
-	return nil
+	return ActionNotImplErr
 }
 
 func (m *Mock) Stop() error {
-	return nil
+	return ActionNotImplErr
 }
 
 func (m *Mock) Remove() error {
-	return nil
+	return ActionNotImplErr
+}
+
+func (m *Mock) Pause() error {
+	return ActionNotImplErr
+}
+
+func (m *Mock) Unpause() error {
+	return ActionNotImplErr
+}
+
+func (m *Mock) Restart() error {
+	return ActionNotImplErr
+}
+
+func (m *Mock) Exec(cmd []string) error {
+	return ActionNotImplErr
 }

connector/manager/runc.go

@@ -7,13 +7,29 @@ func NewRunc() *Runc {
 }
 
 func (rc *Runc) Start() error {
-	return nil
+	return ActionNotImplErr
 }
 
 func (rc *Runc) Stop() error {
-	return nil
+	return ActionNotImplErr
 }
 
 func (rc *Runc) Remove() error {
-	return nil
+	return ActionNotImplErr
+}
+
+func (rc *Runc) Pause() error {
+	return ActionNotImplErr
+}
+
+func (rc *Runc) Unpause() error {
+	return ActionNotImplErr
+}
+
+func (rc *Runc) Restart() error {
+	return ActionNotImplErr
+}
+
+func (rc *Runc) Exec(cmd []string) error {
+	return ActionNotImplErr
 }

connector/mock.go

@@ -14,15 +14,17 @@ import (
 	"github.com/nu7hatch/gouuid"
 )
 
+func init() { enabled["mock"] = NewMock }
+
 type Mock struct {
 	containers container.Containers
 }
 
-func NewMock() *Mock {
+func NewMock() (Connector, error) {
 	cs := &Mock{}
 	go cs.Init()
 	go cs.Loop()
-	return cs
+	return cs, nil
 }
 
 // Create Mock containers
@@ -30,21 +32,46 @@ func (cs *Mock) Init() {
 	rand.Seed(int64(time.Now().Nanosecond()))
 
 	for i := 0; i < 4; i++ {
-		cs.makeContainer(3)
+		cs.makeContainer(3, true)
 	}
 
 	for i := 0; i < 16; i++ {
-		cs.makeContainer(1)
+		cs.makeContainer(1, false)
 	}
 
 }
 
-func (cs *Mock) makeContainer(aggression int64) {
+func (cs *Mock) Wait() struct{} {
+	ch := make(chan struct{})
+	go func() {
+		time.Sleep(30 * time.Second)
+		close(ch)
+	}()
+	return <-ch
+}
+
+var healthStates = []string{"starting", "healthy", "unhealthy"}
+
+func (cs *Mock) makeContainer(aggression int64, health bool) {
 	collector := collector.NewMock(aggression)
 	manager := manager.NewMock()
 	c := container.New(makeID(), collector, manager)
 	c.SetMeta("name", makeName())
 	c.SetState(makeState())
+	if health {
+		var i int
+		c.SetMeta("health", healthStates[i])
+		go func() {
+			for {
+				i++
+				if i >= len(healthStates) {
+					i = 0
+				}
+				c.SetMeta("health", healthStates[i])
+				time.Sleep(12 * time.Second)
+			}
+		}()
+	}
 	cs.containers = append(cs.containers, c)
 }
 
@@ -71,7 +98,7 @@ func (cs *Mock) Get(id string) (*container.Container, bool) {
 	return nil, false
 }
 
-// Return array of all containers, sorted by field
+// All returns array of all containers, sorted by field
 func (cs *Mock) All() container.Containers {
 	cs.containers.Sort()
 	cs.containers.Filter()

connector/runc.go

@@ -1,4 +1,4 @@
-// +build !darwin
+// +build linux
 
 package connector
 
@@ -17,6 +17,8 @@ import (
 	"github.com/opencontainers/runc/libcontainer/cgroups/systemd"
 )
 
+func init() { enabled["runc"] = NewRunc }
+
 type RuncOpts struct {
 	root           string // runc root path
 	systemdCgroups bool   // use systemd cgroups
@@ -52,35 +54,44 @@ type Runc struct {
 	factory       libcontainer.Factory
 	containers    map[string]*container.Container
 	libContainers map[string]libcontainer.Container
+	closed        chan struct{}
 	needsRefresh  chan string // container IDs requiring refresh
 	lock          sync.RWMutex
 }
 
-func NewRunc() Connector {
+func NewRunc() (Connector, error) {
 	opts, err := NewRuncOpts()
-	runcFailOnErr(err)
+	if err != nil {
+		return nil, err
+	}
 
 	factory, err := getFactory(opts)
-	runcFailOnErr(err)
+	if err != nil {
+		return nil, err
+	}
 
 	cm := &Runc{
 		opts:          opts,
 		factory:       factory,
 		containers:    make(map[string]*container.Container),
 		libContainers: make(map[string]libcontainer.Container),
-		needsRefresh:  make(chan string, 60),
+		closed:        make(chan struct{}),
 		lock:          sync.RWMutex{},
 	}
 
 	go func() {
 		for {
-			cm.refreshAll()
-			time.Sleep(5 * time.Second)
+			select {
+			case <-cm.closed:
+				return
+			case <-time.After(5 * time.Second):
+				cm.refreshAll()
+			}
 		}
 	}()
 	go cm.Loop()
 
-	return cm
+	return cm, nil
 }
 
 func (cm *Runc) GetLibc(id string) libcontainer.Container {
@@ -139,7 +150,11 @@ func (cm *Runc) refresh(id string) {
 // Read runc root, creating any new containers
 func (cm *Runc) refreshAll() {
 	list, err := ioutil.ReadDir(cm.opts.root)
-	runcFailOnErr(err)
+	if err != nil {
+		log.Errorf("%s (%T)", err.Error(), err)
+		close(cm.closed)
+		return
+	}
 
 	for _, i := range list {
 		if i.IsDir() {
@@ -166,7 +181,7 @@ func (cm *Runc) Loop() {
 	}
 }
 
-// Get a single ctop container in the map matching libc container, creating one anew if not existing
+// MustGet gets a single ctop container in the map matching libc container, creating one anew if not existing
 func (cm *Runc) MustGet(id string) *container.Container {
 	c, ok := cm.Get(id)
 	if !ok {
@@ -197,14 +212,6 @@ func (cm *Runc) MustGet(id string) *container.Container {
 	return c
 }
 
-// Get a single container, by ID
-func (cm *Runc) Get(id string) (*container.Container, bool) {
-	cm.lock.Lock()
-	defer cm.lock.Unlock()
-	c, ok := cm.containers[id]
-	return c, ok
-}
-
 // Remove containers by ID
 func (cm *Runc) delByID(id string) {
 	cm.lock.Lock()
@@ -214,7 +221,18 @@ func (cm *Runc) delByID(id string) {
 	log.Infof("removed dead container: %s", id)
 }
 
-// Return array of all containers, sorted by field
+// Runc implements Connector
+func (cm *Runc) Wait() struct{} { return <-cm.closed }
+
+// Runc implements Connector
+func (cm *Runc) Get(id string) (*container.Container, bool) {
+	cm.lock.Lock()
+	defer cm.lock.Unlock()
+	c, ok := cm.containers[id]
+	return c, ok
+}
+
+// Runc implements Connector
 func (cm *Runc) All() (containers container.Containers) {
 	cm.lock.Lock()
 	for _, c := range cm.containers {
@@ -229,7 +247,7 @@ func (cm *Runc) All() (containers container.Containers) {
 func getFactory(opts RuncOpts) (libcontainer.Factory, error) {
 	cgroupManager := libcontainer.Cgroupfs
 	if opts.systemdCgroups {
-		if systemd.UseSystemd() {
+		if systemd.IsRunningSystemd() {
 			cgroupManager = libcontainer.SystemdCgroups
 		} else {
 			return nil, fmt.Errorf("systemd cgroup enabled, but systemd support for managing cgroups is not available")
@@ -237,9 +255,3 @@ func getFactory(opts RuncOpts) (libcontainer.Factory, error) {
 	}
 	return libcontainer.New(opts.root, cgroupManager)
 }
-
-func runcFailOnErr(err error) {
-	if err != nil {
-		panic(fmt.Errorf("fatal runc error: %s", err))
-	}
-}

container/main.go

@@ -13,12 +13,16 @@ var (
 	log = logging.Init()
 )
 
+const (
+	running = "running"
+)
+
 // Metrics and metadata representing a container
 type Container struct {
 	models.Metrics
 	Id        string
-	Meta      map[string]string
-	Widgets   *compact.Compact
+	Meta      models.Meta
+	Widgets   *compact.CompactRow
 	Display   bool // display this container in compact view
 	updater   cwidgets.WidgetUpdater
 	collector collector.Collector
@@ -26,11 +30,11 @@ type Container struct {
 }
 
 func New(id string, collector collector.Collector, manager manager.Manager) *Container {
-	widgets := compact.NewCompact(id)
+	widgets := compact.NewCompactRow()
 	return &Container{
 		Metrics:   models.NewMetrics(),
 		Id:        id,
-		Meta:      make(map[string]string),
+		Meta:      models.NewMeta("id", id),
 		Widgets:   widgets,
 		updater:   widgets,
 		collector: collector,
@@ -38,39 +42,40 @@ func New(id string, collector collector.Collector, manager manager.Manager) *Con
 	}
 }
 
+func (c *Container) RecreateWidgets() {
+	c.SetUpdater(cwidgets.NullWidgetUpdater{})
+	c.Widgets = compact.NewCompactRow()
+	c.SetUpdater(c.Widgets)
+}
+
 func (c *Container) SetUpdater(u cwidgets.WidgetUpdater) {
 	c.updater = u
-	for k, v := range c.Meta {
-		c.updater.SetMeta(k, v)
-	}
+	c.updater.SetMeta(c.Meta)
 }
 
 func (c *Container) SetMeta(k, v string) {
 	c.Meta[k] = v
-	c.updater.SetMeta(k, v)
+	c.updater.SetMeta(c.Meta)
 }
 
 func (c *Container) GetMeta(k string) string {
-	if v, ok := c.Meta[k]; ok {
-		return v
-	}
-	return ""
+	return c.Meta.Get(k)
 }
 
 func (c *Container) SetState(s string) {
 	c.SetMeta("state", s)
 	// start collector, if needed
-	if s == "running" && !c.collector.Running() {
+	if s == running && !c.collector.Running() {
 		c.collector.Start()
 		c.Read(c.collector.Stream())
 	}
 	// stop collector, if needed
-	if s != "running" && c.collector.Running() {
+	if s != running && c.collector.Running() {
 		c.collector.Stop()
 	}
 }
 
-// Return container log collector
+// Logs returns container log collector
 func (c *Container) Logs() collector.LogCollector {
 	return c.collector.Logs()
 }
@@ -90,18 +95,18 @@ func (c *Container) Read(stream chan models.Metrics) {
 }
 
 func (c *Container) Start() {
-	if c.Meta["state"] != "running" {
+	if c.Meta["state"] != running {
 		if err := c.manager.Start(); err != nil {
 			log.Warningf("container %s: %v", c.Id, err)
 			log.StatusErr(err)
 			return
 		}
-		c.SetState("running")
+		c.SetState(running)
 	}
 }
 
 func (c *Container) Stop() {
-	if c.Meta["state"] == "running" {
+	if c.Meta["state"] == running {
 		if err := c.manager.Stop(); err != nil {
 			log.Warningf("container %s: %v", c.Id, err)
 			log.StatusErr(err)
@@ -117,3 +122,39 @@ func (c *Container) Remove() {
 		log.StatusErr(err)
 	}
 }
+
+func (c *Container) Pause() {
+	if c.Meta["state"] == running {
+		if err := c.manager.Pause(); err != nil {
+			log.Warningf("container %s: %v", c.Id, err)
+			log.StatusErr(err)
+			return
+		}
+		c.SetState("paused")
+	}
+}
+
+func (c *Container) Unpause() {
+	if c.Meta["state"] == "paused" {
+		if err := c.manager.Unpause(); err != nil {
+			log.Warningf("container %s: %v", c.Id, err)
+			log.StatusErr(err)
+			return
+		}
+		c.SetState(running)
+	}
+}
+
+func (c *Container) Restart() {
+	if c.Meta["state"] == running {
+		if err := c.manager.Restart(); err != nil {
+			log.Warningf("container %s: %v", c.Id, err)
+			log.StatusErr(err)
+			return
+		}
+	}
+}
+
+func (c *Container) Exec(cmd []string) error {
+	return c.manager.Exec(cmd)
+}

cursor.go

@@ -11,7 +11,7 @@ import (
 type GridCursor struct {
 	selectedID  string // id of currently selected container
 	filtered    container.Containers
-	cSource     connector.Connector
+	cSuper      *connector.ConnectorSuper
 	isScrolling bool // toggled when actively scrolling
 }
 
@@ -25,14 +25,20 @@ func (gc *GridCursor) Selected() *container.Container {
 	return nil
 }
 
-// Refresh containers from source
-func (gc *GridCursor) RefreshContainers() (lenChanged bool) {
+// Refresh containers from source, returning whether the quantity of
+// containers has changed and any error
+func (gc *GridCursor) RefreshContainers() (bool, error) {
 	oldLen := gc.Len()
-
-	// Containers filtered by display bool
 	gc.filtered = container.Containers{}
+
+	cSource, err := gc.cSuper.Get()
+	if err != nil {
+		return true, err
+	}
+
+	// filter Containers by display bool
 	var cursorVisible bool
-	for _, c := range gc.cSource.All() {
+	for _, c := range cSource.All() {
 		if c.Display {
 			if c.Id == gc.selectedID {
 				cursorVisible = true
@@ -41,31 +47,30 @@ func (gc *GridCursor) RefreshContainers() (lenChanged bool) {
 		}
 	}
 
-	if oldLen != gc.Len() {
-		lenChanged = true
+	if !cursorVisible || gc.selectedID == "" {
+		gc.Reset()
 	}
 
-	if !cursorVisible {
-		gc.Reset()
-	}
-	if gc.selectedID == "" {
-		gc.Reset()
-	}
-	return lenChanged
+	return oldLen != gc.Len(), nil
 }
 
 // Set an initial cursor position, if possible
 func (gc *GridCursor) Reset() {
-	for _, c := range gc.cSource.All() {
-		c.Widgets.Name.UnHighlight()
+	cSource, err := gc.cSuper.Get()
+	if err != nil {
+		return
+	}
+
+	for _, c := range cSource.All() {
+		c.Widgets.UnHighlight()
 	}
 	if gc.Len() > 0 {
 		gc.selectedID = gc.filtered[0].Id
-		gc.filtered[0].Widgets.Name.Highlight()
+		gc.filtered[0].Widgets.Highlight()
 	}
 }
 
-// Return current cursor index
+// Idx returns current cursor index
 func (gc *GridCursor) Idx() int {
 	for n, c := range gc.filtered {
 		if c.Id == gc.selectedID {
@@ -109,9 +114,9 @@ func (gc *GridCursor) Up() {
 	active := gc.filtered[idx]
 	next := gc.filtered[idx-1]
 
-	active.Widgets.Name.UnHighlight()
+	active.Widgets.UnHighlight()
 	gc.selectedID = next.Id
-	next.Widgets.Name.Highlight()
+	next.Widgets.Highlight()
 
 	gc.ScrollPage()
 	ui.Render(cGrid)
@@ -128,9 +133,9 @@ func (gc *GridCursor) Down() {
 	active := gc.filtered[idx]
 	next := gc.filtered[idx+1]
 
-	active.Widgets.Name.UnHighlight()
+	active.Widgets.UnHighlight()
 	gc.selectedID = next.Id
-	next.Widgets.Name.Highlight()
+	next.Widgets.Highlight()
 
 	gc.ScrollPage()
 	ui.Render(cGrid)
@@ -151,9 +156,9 @@ func (gc *GridCursor) PgUp() {
 	active := gc.filtered[idx]
 	next := gc.filtered[nextidx]
 
-	active.Widgets.Name.UnHighlight()
+	active.Widgets.UnHighlight()
 	gc.selectedID = next.Id
-	next.Widgets.Name.Highlight()
+	next.Widgets.Highlight()
 
 	cGrid.Align()
 	ui.Render(cGrid)
@@ -174,9 +179,9 @@ func (gc *GridCursor) PgDown() {
 	active := gc.filtered[idx]
 	next := gc.filtered[nextidx]
 
-	active.Widgets.Name.UnHighlight()
+	active.Widgets.UnHighlight()
 	gc.selectedID = next.Id
-	next.Widgets.Name.Highlight()
+	next.Widgets.Highlight()
 
 	cGrid.Align()
 	ui.Render(cGrid)

cwidgets/compact/column.go

@@ -0,0 +1,49 @@
+package compact
+
+import (
+	"github.com/bcicen/ctop/config"
+	"github.com/bcicen/ctop/models"
+
+	ui "github.com/gizak/termui"
+)
+
+var (
+	allCols = map[string]NewCompactColFn{
+		"status": NewStatus,
+		"name":   NewNameCol,
+		"id":     NewCIDCol,
+		"cpu":    NewCPUCol,
+		"mem":    NewMemCol,
+		"net":    NewNetCol,
+		"io":     NewIOCol,
+		"pids":   NewPIDCol,
+	}
+)
+
+type NewCompactColFn func() CompactCol
+
+func newRowWidgets() []CompactCol {
+	enabled := config.EnabledColumns()
+	cols := make([]CompactCol, len(enabled))
+
+	for n, name := range enabled {
+		wFn, ok := allCols[name]
+		if !ok {
+			panic("no such widget name: %s" + name)
+		}
+		cols[n] = wFn()
+	}
+
+	return cols
+}
+
+type CompactCol interface {
+	ui.GridBufferer
+	Reset()
+	Header() string  // header text to display for column
+	FixedWidth() int // fixed width size. if == 0, width is automatically calculated
+	Highlight()
+	UnHighlight()
+	SetMeta(models.Meta)
+	SetMetrics(models.Metrics)
+}

cwidgets/compact/gauge.go

@@ -1,21 +1,60 @@
 package compact
 
 import (
+	"fmt"
+
+	"github.com/bcicen/ctop/cwidgets"
+	"github.com/bcicen/ctop/models"
+
 	ui "github.com/gizak/termui"
 )
 
-type GaugeCol struct {
-	*ui.Gauge
+type CPUCol struct {
+	*GaugeCol
 }
 
-func NewGaugeCol() *GaugeCol {
-	g := ui.NewGauge()
+func NewCPUCol() CompactCol {
+	return &CPUCol{NewGaugeCol("CPU")}
+}
+
+func (w *CPUCol) SetMetrics(m models.Metrics) {
+	val := m.CPUUtil
+	w.BarColor = colorScale(val)
+	w.Label = fmt.Sprintf("%d%%", val)
+
+	if val > 100 {
+		val = 100
+	}
+	w.Percent = val
+}
+
+type MemCol struct {
+	*GaugeCol
+}
+
+func NewMemCol() CompactCol {
+	return &MemCol{NewGaugeCol("MEM")}
+}
+
+func (w *MemCol) SetMetrics(m models.Metrics) {
+	w.BarColor = ui.ThemeAttr("gauge.bar.bg")
+	w.Label = fmt.Sprintf("%s / %s", cwidgets.ByteFormat64Short(m.MemUsage), cwidgets.ByteFormat64Short(m.MemLimit))
+	w.Percent = m.MemPercent
+}
+
+type GaugeCol struct {
+	*ui.Gauge
+	header string
+	fWidth int
+}
+
+func NewGaugeCol(header string) *GaugeCol {
+	g := &GaugeCol{ui.NewGauge(), header, 0}
 	g.Height = 1
 	g.Border = false
-	g.Percent = 0
 	g.PaddingBottom = 0
-	g.Label = "-"
-	return &GaugeCol{g}
+	g.Reset()
+	return g
 }
 
 func (w *GaugeCol) Reset() {
@@ -23,6 +62,35 @@ func (w *GaugeCol) Reset() {
 	w.Percent = 0
 }
 
+func (w *GaugeCol) Buffer() ui.Buffer {
+	// if bar would not otherwise be visible, set a minimum
+	// percentage value and low-contrast color for structure
+	if w.Percent < 5 {
+		w.Percent = 5
+		w.BarColor = ui.ColorBlack
+	}
+
+	return w.Gauge.Buffer()
+}
+
+// GaugeCol implements CompactCol
+func (w *GaugeCol) SetMeta(models.Meta)       {}
+func (w *GaugeCol) SetMetrics(models.Metrics) {}
+func (w *GaugeCol) Header() string            { return w.header }
+func (w *GaugeCol) FixedWidth() int           { return w.fWidth }
+
+// GaugeCol implements CompactCol
+func (w *GaugeCol) Highlight() {
+	w.Bg = ui.ThemeAttr("par.text.fg")
+	w.PercentColor = ui.ThemeAttr("par.text.hi")
+}
+
+// GaugeCol implements CompactCol
+func (w *GaugeCol) UnHighlight() {
+	w.Bg = ui.ThemeAttr("par.text.bg")
+	w.PercentColor = ui.ThemeAttr("par.text.bg")
+}
+
 func colorScale(n int) ui.Attribute {
 	if n > 70 {
 		return ui.ThemeAttr("status.danger")

cwidgets/compact/grid.go

@@ -4,11 +4,11 @@ import (
 	ui "github.com/gizak/termui"
 )
 
-var header *CompactHeader
-
 type CompactGrid struct {
 	ui.GridBufferer
-	Rows   []ui.GridBufferer
+	header *CompactHeader
+	cols   []CompactCol // reference columns
+	Rows   []RowBufferer
 	X, Y   int
 	Width  int
 	Height int
@@ -16,37 +16,64 @@ type CompactGrid struct {
 }
 
 func NewCompactGrid() *CompactGrid {
-	header = NewCompactHeader() // init column header
-	return &CompactGrid{}
+	cg := &CompactGrid{header: NewCompactHeader()}
+	cg.rebuildHeader()
+	return cg
 }
 
 func (cg *CompactGrid) Align() {
 	y := cg.Y
 
-	if cg.Offset >= len(cg.Rows) {
-		cg.Offset = 0
-	}
-	if cg.Offset < 0 {
+	if cg.Offset >= len(cg.Rows) || cg.Offset < 0 {
 		cg.Offset = 0
 	}
 
 	// update row ypos, width recursively
+	colWidths := cg.calcWidths()
 	for _, r := range cg.pageRows() {
 		r.SetY(y)
 		y += r.GetHeight()
-		r.SetWidth(cg.Width)
+		r.SetWidths(cg.Width, colWidths)
 	}
 }
 
-func (cg *CompactGrid) Clear()         { cg.Rows = []ui.GridBufferer{} }
-func (cg *CompactGrid) GetHeight() int { return len(cg.Rows) + header.Height }
+func (cg *CompactGrid) Clear() {
+	cg.Rows = []RowBufferer{}
+	cg.rebuildHeader()
+}
+
+func (cg *CompactGrid) GetHeight() int { return len(cg.Rows) + cg.header.Height }
 func (cg *CompactGrid) SetX(x int)     { cg.X = x }
 func (cg *CompactGrid) SetY(y int)     { cg.Y = y }
 func (cg *CompactGrid) SetWidth(w int) { cg.Width = w }
-func (cg *CompactGrid) MaxRows() int   { return ui.TermHeight() - header.Height - cg.Y }
+func (cg *CompactGrid) MaxRows() int   { return ui.TermHeight() - cg.header.Height - cg.Y }
 
-func (cg *CompactGrid) pageRows() (rows []ui.GridBufferer) {
-	rows = append(rows, header)
+// calculate and return per-column width
+func (cg *CompactGrid) calcWidths() []int {
+	var autoCols int
+	width := cg.Width
+	colWidths := make([]int, len(cg.cols))
+
+	for n, w := range cg.cols {
+		colWidths[n] = w.FixedWidth()
+		width -= w.FixedWidth()
+		if w.FixedWidth() == 0 {
+			autoCols++
+		}
+	}
+
+	spacing := colSpacing * len(cg.cols)
+	autoWidth := (width - spacing) / autoCols
+	for n, val := range colWidths {
+		if val == 0 {
+			colWidths[n] = autoWidth
+		}
+	}
+	return colWidths
+}
+
+func (cg *CompactGrid) pageRows() (rows []RowBufferer) {
+	rows = append(rows, cg.header)
 	rows = append(rows, cg.Rows[cg.Offset:]...)
 	return rows
 }
@@ -59,8 +86,14 @@ func (cg *CompactGrid) Buffer() ui.Buffer {
 	return buf
 }
 
-func (cg *CompactGrid) AddRows(rows ...ui.GridBufferer) {
-	for _, r := range rows {
-		cg.Rows = append(cg.Rows, r)
+func (cg *CompactGrid) AddRows(rows ...RowBufferer) {
+	cg.Rows = append(cg.Rows, rows...)
+}
+
+func (cg *CompactGrid) rebuildHeader() {
+	cg.cols = newRowWidgets()
+	cg.header.clearFieldPars()
+	for _, col := range cg.cols {
+		cg.header.addFieldPar(col.Header())
 	}
 }

cwidgets/compact/header.go

@@ -8,63 +8,59 @@ type CompactHeader struct {
 	X, Y   int
 	Width  int
 	Height int
+	cols   []CompactCol
+	widths []int
 	pars   []*ui.Par
 }
 
 func NewCompactHeader() *CompactHeader {
-	fields := []string{"", "NAME", "CID", "CPU", "MEM", "NET RX/TX", "IO R/W", "PIDS"}
-	ch := &CompactHeader{}
-	ch.Height = 2
-	for _, f := range fields {
-		ch.addFieldPar(f)
+	return &CompactHeader{
+		X:      rowPadding,
+		Height: 2,
 	}
-	return ch
 }
 
-func (ch *CompactHeader) GetHeight() int {
-	return ch.Height
+func (row *CompactHeader) GetHeight() int {
+	return row.Height
 }
 
-func (ch *CompactHeader) SetWidth(w int) {
-	x := ch.X
-	autoWidth := calcWidth(w)
-	for n, col := range ch.pars {
-		// set column to static width
-		if colWidths[n] != 0 {
-			col.SetX(x)
-			col.SetWidth(colWidths[n])
-			x += colWidths[n]
-			continue
-		}
-		col.SetX(x)
-		col.SetWidth(autoWidth)
-		x += autoWidth + colSpacing
+func (row *CompactHeader) SetWidths(totalWidth int, widths []int) {
+	x := row.X
+
+	for n, w := range row.pars {
+		w.SetX(x)
+		w.SetWidth(widths[n])
+		x += widths[n] + colSpacing
 	}
-	ch.Width = w
+	row.Width = totalWidth
 }
 
-func (ch *CompactHeader) SetX(x int) {
-	ch.X = x
+func (row *CompactHeader) SetX(x int) {
+	row.X = x
 }
 
-func (ch *CompactHeader) SetY(y int) {
-	for _, p := range ch.pars {
+func (row *CompactHeader) SetY(y int) {
+	for _, p := range row.pars {
 		p.SetY(y)
 	}
-	ch.Y = y
+	row.Y = y
 }
 
-func (ch *CompactHeader) Buffer() ui.Buffer {
+func (row *CompactHeader) Buffer() ui.Buffer {
 	buf := ui.NewBuffer()
-	for _, p := range ch.pars {
+	for _, p := range row.pars {
 		buf.Merge(p.Buffer())
 	}
 	return buf
 }
 
-func (ch *CompactHeader) addFieldPar(s string) {
-	p := ui.NewPar(s)
-	p.Height = ch.Height
-	p.Border = false
-	ch.pars = append(ch.pars, p)
+func (row *CompactHeader) clearFieldPars() {
+	row.pars = []*ui.Par{}
+}
+
+func (row *CompactHeader) addFieldPar(s string) {
+	p := ui.NewPar(s)
+	p.Height = row.Height
+	p.Border = false
+	row.pars = append(row.pars, p)
 }

cwidgets/compact/main.go

@@ -1,144 +0,0 @@
-package compact
-
-import (
-	"github.com/bcicen/ctop/logging"
-	"github.com/bcicen/ctop/models"
-	ui "github.com/gizak/termui"
-)
-
-var log = logging.Init()
-
-type Compact struct {
-	Status *Status
-	Name   *TextCol
-	Cid    *TextCol
-	Cpu    *GaugeCol
-	Mem    *GaugeCol
-	Net    *TextCol
-	IO     *TextCol
-	Pids   *TextCol
-	X, Y   int
-	Width  int
-	Height int
-}
-
-func NewCompact(id string) *Compact {
-	// truncate container id
-	if len(id) > 12 {
-		id = id[:12]
-	}
-	row := &Compact{
-		Status: NewStatus(),
-		Name:   NewTextCol("-"),
-		Cid:    NewTextCol(id),
-		Cpu:    NewGaugeCol(),
-		Mem:    NewGaugeCol(),
-		Net:    NewTextCol("-"),
-		IO:     NewTextCol("-"),
-		Pids:   NewTextCol("-"),
-		X:      1,
-		Height: 1,
-	}
-	return row
-}
-
-//func (row *Compact) ToggleExpand() {
-//if row.Height == 1 {
-//row.Height = 4
-//} else {
-//row.Height = 1
-//}
-//}
-
-func (row *Compact) SetMeta(k, v string) {
-	switch k {
-	case "name":
-		row.Name.Set(v)
-	case "state":
-		row.Status.Set(v)
-	case "health":
-		row.Status.SetHealth(v)
-	}
-}
-
-func (row *Compact) SetMetrics(m models.Metrics) {
-	row.SetCPU(m.CPUUtil)
-	row.SetNet(m.NetRx, m.NetTx)
-	row.SetMem(m.MemUsage, m.MemLimit, m.MemPercent)
-	row.SetIO(m.IOBytesRead, m.IOBytesWrite)
-	row.SetPids(m.Pids)
-}
-
-// Set gauges, counters to default unread values
-func (row *Compact) Reset() {
-	row.Cpu.Reset()
-	row.Mem.Reset()
-	row.Net.Reset()
-	row.IO.Reset()
-	row.Pids.Reset()
-}
-
-func (row *Compact) GetHeight() int {
-	return row.Height
-}
-
-func (row *Compact) SetX(x int) {
-	row.X = x
-}
-
-func (row *Compact) SetY(y int) {
-	if y == row.Y {
-		return
-	}
-	for _, col := range row.all() {
-		col.SetY(y)
-	}
-	row.Y = y
-}
-
-func (row *Compact) SetWidth(width int) {
-	if width == row.Width {
-		return
-	}
-	x := row.X
-	autoWidth := calcWidth(width)
-	for n, col := range row.all() {
-		if colWidths[n] != 0 {
-			col.SetX(x)
-			col.SetWidth(colWidths[n])
-			x += colWidths[n]
-			continue
-		}
-		col.SetX(x)
-		col.SetWidth(autoWidth)
-		x += autoWidth + colSpacing
-	}
-	row.Width = width
-}
-
-func (row *Compact) Buffer() ui.Buffer {
-	buf := ui.NewBuffer()
-
-	buf.Merge(row.Status.Buffer())
-	buf.Merge(row.Name.Buffer())
-	buf.Merge(row.Cid.Buffer())
-	buf.Merge(row.Cpu.Buffer())
-	buf.Merge(row.Mem.Buffer())
-	buf.Merge(row.Net.Buffer())
-	buf.Merge(row.IO.Buffer())
-	buf.Merge(row.Pids.Buffer())
-	return buf
-}
-
-func (row *Compact) all() []ui.GridBufferer {
-	return []ui.GridBufferer{
-		row.Status,
-		row.Name,
-		row.Cid,
-		row.Cpu,
-		row.Mem,
-		row.Net,
-		row.IO,
-		row.Pids,
-	}
-}

cwidgets/compact/row.go

@@ -0,0 +1,129 @@
+package compact
+
+import (
+	"github.com/bcicen/ctop/config"
+	"github.com/bcicen/ctop/logging"
+	"github.com/bcicen/ctop/models"
+
+	ui "github.com/gizak/termui"
+)
+
+const rowPadding = 1
+
+var log = logging.Init()
+
+type RowBufferer interface {
+	SetY(int)
+	SetWidths(int, []int)
+	GetHeight() int
+	Buffer() ui.Buffer
+}
+
+type CompactRow struct {
+	Bg     *RowBg
+	Cols   []CompactCol
+	X, Y   int
+	Height int
+	widths []int // column widths
+}
+
+func NewCompactRow() *CompactRow {
+	row := &CompactRow{
+		Bg:     NewRowBg(),
+		Cols:   newRowWidgets(),
+		X:      rowPadding,
+		Height: 1,
+	}
+
+	return row
+}
+
+func (row *CompactRow) SetMeta(m models.Meta) {
+	for _, w := range row.Cols {
+		w.SetMeta(m)
+	}
+}
+
+func (row *CompactRow) SetMetrics(m models.Metrics) {
+	for _, w := range row.Cols {
+		w.SetMetrics(m)
+	}
+}
+
+// Set gauges, counters, etc. to default unread values
+func (row *CompactRow) Reset() {
+	for _, w := range row.Cols {
+		w.Reset()
+	}
+}
+
+func (row *CompactRow) GetHeight() int { return row.Height }
+
+//func (row *CompactRow) SetX(x int)     { row.X = x }
+
+func (row *CompactRow) SetY(y int) {
+	if y == row.Y {
+		return
+	}
+
+	row.Bg.Y = y
+	for _, w := range row.Cols {
+		w.SetY(y)
+	}
+	row.Y = y
+}
+
+func (row *CompactRow) SetWidths(totalWidth int, widths []int) {
+	x := row.X
+
+	row.Bg.SetX(x)
+	row.Bg.SetWidth(totalWidth)
+
+	for n, w := range row.Cols {
+		w.SetX(x)
+		w.SetWidth(widths[n])
+		x += widths[n] + colSpacing
+	}
+}
+
+func (row *CompactRow) Buffer() ui.Buffer {
+	buf := ui.NewBuffer()
+	buf.Merge(row.Bg.Buffer())
+	for _, w := range row.Cols {
+		buf.Merge(w.Buffer())
+	}
+	return buf
+}
+
+func (row *CompactRow) Highlight() {
+	row.Cols[1].Highlight()
+	if config.GetSwitchVal("fullRowCursor") {
+		for _, w := range row.Cols {
+			w.Highlight()
+		}
+	}
+}
+
+func (row *CompactRow) UnHighlight() {
+	row.Cols[1].UnHighlight()
+	if config.GetSwitchVal("fullRowCursor") {
+		for _, w := range row.Cols {
+			w.UnHighlight()
+		}
+	}
+}
+
+type RowBg struct {
+	*ui.Par
+}
+
+func NewRowBg() *RowBg {
+	bg := ui.NewPar("")
+	bg.Height = 1
+	bg.Border = false
+	bg.Bg = ui.ThemeAttr("par.text.bg")
+	return &RowBg{bg}
+}
+
+func (w *RowBg) Highlight()   { w.Bg = ui.ThemeAttr("par.text.fg") }
+func (w *RowBg) UnHighlight() { w.Bg = ui.ThemeAttr("par.text.bg") }

cwidgets/compact/setters.go

@@ -1,48 +0,0 @@
-package compact
-
-import (
-	"fmt"
-	"strconv"
-
-	"github.com/bcicen/ctop/cwidgets"
-	ui "github.com/gizak/termui"
-)
-
-func (row *Compact) SetNet(rx int64, tx int64) {
-	label := fmt.Sprintf("%s / %s", cwidgets.ByteFormat(rx), cwidgets.ByteFormat(tx))
-	row.Net.Set(label)
-}
-
-func (row *Compact) SetIO(read int64, write int64) {
-	label := fmt.Sprintf("%s / %s", cwidgets.ByteFormat(read), cwidgets.ByteFormat(write))
-	row.IO.Set(label)
-}
-
-func (row *Compact) SetPids(val int) {
-	label := fmt.Sprintf("%s", strconv.Itoa(val))
-	row.Pids.Set(label)
-}
-
-func (row *Compact) SetCPU(val int) {
-	row.Cpu.BarColor = colorScale(val)
-	row.Cpu.Label = fmt.Sprintf("%s%%", strconv.Itoa(val))
-	if val < 5 {
-		val = 5
-		row.Cpu.BarColor = ui.ThemeAttr("gauge.bar.bg")
-	}
-	if val > 100 {
-		val = 100
-	}
-	row.Cpu.Percent = val
-}
-
-func (row *Compact) SetMem(val int64, limit int64, percent int) {
-	row.Mem.Label = fmt.Sprintf("%s / %s", cwidgets.ByteFormat(val), cwidgets.ByteFormat(limit))
-	if percent < 5 {
-		percent = 5
-		row.Mem.BarColor = ui.ColorBlack
-	} else {
-		row.Mem.BarColor = ui.ThemeAttr("gauge.bar.bg")
-	}
-	row.Mem.Percent = percent
-}

cwidgets/compact/status.go

@@ -1,12 +1,14 @@
 package compact
 
 import (
+	"github.com/bcicen/ctop/models"
+
 	ui "github.com/gizak/termui"
 )
 
 const (
-	mark       = string('\u25C9')
-	healthMark = string('\u207A')
+	mark       = "◉"
+	healthMark = "✚"
 	vBar       = string('\u25AE') + string('\u25AE')
 )
 
@@ -17,29 +19,46 @@ type Status struct {
 	health []ui.Cell
 }
 
-func NewStatus() *Status {
-	s := &Status{Block: ui.NewBlock()}
+func NewStatus() CompactCol {
+	s := &Status{
+		Block:  ui.NewBlock(),
+		health: []ui.Cell{{Ch: ' '}},
+	}
 	s.Height = 1
 	s.Border = false
-	s.Set("")
+	s.setState("")
 	return s
 }
 
 func (s *Status) Buffer() ui.Buffer {
 	buf := s.Block.Buffer()
 	x := 0
-	for _, c := range s.status {
+	for _, c := range s.health {
 		buf.Set(s.InnerX()+x, s.InnerY(), c)
 		x += c.Width()
 	}
-	for _, c := range s.health {
+	x += 1
+	for _, c := range s.status {
 		buf.Set(s.InnerX()+x, s.InnerY(), c)
 		x += c.Width()
 	}
 	return buf
 }
 
-func (s *Status) Set(val string) {
+func (s *Status) SetMeta(m models.Meta) {
+	s.setState(m.Get("state"))
+	s.setHealth(m.Get("health"))
+}
+
+// Status implements CompactCol
+func (s *Status) Reset()                    {}
+func (s *Status) SetMetrics(models.Metrics) {}
+func (s *Status) Highlight()                {}
+func (s *Status) UnHighlight()              {}
+func (s *Status) Header() string            { return "" }
+func (s *Status) FixedWidth() int           { return 3 }
+
+func (s *Status) setState(val string) {
 	// defaults
 	text := mark
 	color := ui.ColorDefault
@@ -53,31 +72,25 @@ func (s *Status) Set(val string) {
 		text = vBar
 	}
 
-	var cells []ui.Cell
-	for _, ch := range text {
-		cells = append(cells, ui.Cell{Ch: ch, Fg: color})
-	}
-	s.status = cells
+	s.status = ui.TextCells(text, color, ui.ColorDefault)
 }
 
-func (s *Status) SetHealth(val string) {
-	if val == "" {
-		return
-	}
+func (s *Status) setHealth(val string) {
 	color := ui.ColorDefault
+	mark := healthMark
 
 	switch val {
+	case "":
+		return
 	case "healthy":
 		color = ui.ThemeAttr("status.ok")
 	case "unhealthy":
 		color = ui.ThemeAttr("status.danger")
 	case "starting":
 		color = ui.ThemeAttr("status.warn")
+	default:
+		log.Warningf("unknown health state string: \"%v\"", val)
 	}
 
-	var cells []ui.Cell
-	for _, ch := range healthMark {
-		cells = append(cells, ui.Cell{Ch: ch, Fg: color})
-	}
-	s.health = cells
+	s.health = ui.TextCells(mark, color, ui.ColorDefault)
 }

cwidgets/compact/text.go

@@ -1,35 +1,113 @@
 package compact
 
 import (
+	"fmt"
+
+	"github.com/bcicen/ctop/cwidgets"
+	"github.com/bcicen/ctop/models"
+
 	ui "github.com/gizak/termui"
 )
 
-type TextCol struct {
-	*ui.Par
+type NameCol struct {
+	*TextCol
 }
 
-func NewTextCol(s string) *TextCol {
-	p := ui.NewPar(s)
+func NewNameCol() CompactCol {
+	return &NameCol{NewTextCol("NAME")}
+}
+
+func (w *NameCol) SetMeta(m models.Meta) {
+	w.Text = m.Get("name")
+	// truncate container id
+	if len(w.Text) > 12 {
+		w.Text = w.Text[:12]
+	}
+}
+
+type CIDCol struct {
+	*TextCol
+}
+
+func NewCIDCol() CompactCol {
+	return &CIDCol{NewTextCol("CID")}
+}
+
+func (w *CIDCol) SetMeta(m models.Meta) {
+	w.Text = m.Get("id")
+	if len(w.Text) > 12 {
+		w.Text = w.Text[:12]
+	}
+}
+
+type NetCol struct {
+	*TextCol
+}
+
+func NewNetCol() CompactCol {
+	return &NetCol{NewTextCol("NET RX/TX")}
+}
+
+func (w *NetCol) SetMetrics(m models.Metrics) {
+	label := fmt.Sprintf("%s / %s", cwidgets.ByteFormat64Short(m.NetRx), cwidgets.ByteFormat64Short(m.NetTx))
+	w.Text = label
+}
+
+type IOCol struct {
+	*TextCol
+}
+
+func NewIOCol() CompactCol {
+	return &IOCol{NewTextCol("IO R/W")}
+}
+
+func (w *IOCol) SetMetrics(m models.Metrics) {
+	label := fmt.Sprintf("%s / %s", cwidgets.ByteFormat64Short(m.IOBytesRead), cwidgets.ByteFormat64Short(m.IOBytesWrite))
+	w.Text = label
+}
+
+type PIDCol struct {
+	*TextCol
+}
+
+func NewPIDCol() CompactCol {
+	w := &PIDCol{NewTextCol("PIDS")}
+	w.fWidth = 4
+	return w
+}
+
+func (w *PIDCol) SetMetrics(m models.Metrics) {
+	w.Text = fmt.Sprintf("%d", m.Pids)
+}
+
+type TextCol struct {
+	*ui.Par
+	header string
+	fWidth int
+}
+
+func NewTextCol(header string) *TextCol {
+	p := ui.NewPar("-")
 	p.Border = false
 	p.Height = 1
 	p.Width = 20
-	return &TextCol{p}
+	return &TextCol{p, header, 0}
 }
 
 func (w *TextCol) Highlight() {
+	w.Bg = ui.ThemeAttr("par.text.fg")
 	w.TextFgColor = ui.ThemeAttr("par.text.hi")
 	w.TextBgColor = ui.ThemeAttr("par.text.fg")
 }
 
 func (w *TextCol) UnHighlight() {
+	w.Bg = ui.ThemeAttr("par.text.bg")
 	w.TextFgColor = ui.ThemeAttr("par.text.fg")
 	w.TextBgColor = ui.ThemeAttr("par.text.bg")
 }
 
-func (w *TextCol) Reset() {
-	w.Text = "-"
-}
-
-func (w *TextCol) Set(s string) {
-	w.Text = s
-}
+func (w *TextCol) Reset()                    { w.Text = "-" }
+func (w *TextCol) SetMeta(models.Meta)       {}
+func (w *TextCol) SetMetrics(models.Metrics) {}
+func (w *TextCol) Header() string            { return w.header }
+func (w *TextCol) FixedWidth() int           { return w.fWidth }

cwidgets/compact/util.go

@@ -4,36 +4,12 @@ package compact
 
 import (
 	"fmt"
+
 	ui "github.com/gizak/termui"
 )
 
 const colSpacing = 1
 
-// per-column width. 0 == auto width
-var colWidths = []int{
-	3, // status
-	0, // name
-	0, // cid
-	0, // cpu
-	0, // memory
-	0, // net
-	0, // io
-	4, // pids
-}
-
-// Calculate per-column width, given total width
-func calcWidth(width int) int {
-	spacing := colSpacing * len(colWidths)
-	var staticCols int
-	for _, w := range colWidths {
-		width -= w
-		if w == 0 {
-			staticCols += 1
-		}
-	}
-	return (width - spacing) / staticCols
-}
-
 func centerParText(p *ui.Par) {
 	var text string
 	var padding string

cwidgets/main.go

@@ -8,6 +8,14 @@ import (
 var log = logging.Init()
 
 type WidgetUpdater interface {
-	SetMeta(string, string)
+	SetMeta(models.Meta)
 	SetMetrics(models.Metrics)
 }
+
+type NullWidgetUpdater struct{}
+
+// NullWidgetUpdater implements WidgetUpdater
+func (wu NullWidgetUpdater) SetMeta(models.Meta) {}
+
+// NullWidgetUpdater implements WidgetUpdater
+func (wu NullWidgetUpdater) SetMetrics(models.Metrics) {}

cwidgets/single/env.go

@@ -0,0 +1,36 @@
+package single
+
+import (
+	ui "github.com/gizak/termui"
+	"regexp"
+)
+
+var envPattern = regexp.MustCompile(`(?P<KEY>[^=]+)=(?P<VALUJE>.*)`)
+
+type Env struct {
+	*ui.Table
+	data map[string]string
+}
+
+func NewEnv() *Env {
+	p := ui.NewTable()
+	p.Height = 4
+	p.Width = colWidth[0]
+	p.FgColor = ui.ThemeAttr("par.text.fg")
+	p.Separator = false
+	i := &Env{p, make(map[string]string)}
+	i.BorderLabel = "Env"
+	return i
+}
+
+func (w *Env) Set(k, v string) {
+	match := envPattern.FindStringSubmatch(v)
+	key := match[1]
+	value := match[2]
+	w.data[key] = value
+
+	w.Rows = [][]string{}
+	w.Rows = append(w.Rows, mkInfoRows(key, value)...)
+
+	w.Height = len(w.Rows) + 2
+}

cwidgets/single/info.go

@@ -6,7 +6,7 @@ import (
 	ui "github.com/gizak/termui"
 )
 
-var displayInfo = []string{"id", "name", "image", "ports", "state", "created", "health"}
+var displayInfo = []string{"id", "name", "image", "ports", "IPs", "state", "created", "health"}
 
 type Info struct {
 	*ui.Table
@@ -45,7 +45,7 @@ func mkInfoRows(k, v string) (rows [][]string) {
 	// initial row with field name
 	rows = append(rows, []string{k, lines[0]})
 
-	// append any additional lines in seperate row
+	// append any additional lines in separate row
 	if len(lines) > 1 {
 		for _, line := range lines[1:] {
 			if line != "" {

cwidgets/single/io.go

@@ -42,10 +42,10 @@ func (w *IO) Update(read int64, write int64) {
 	var rate string
 
 	w.readHist.Append(int(read))
-	rate = strings.ToLower(cwidgets.ByteFormatInt(w.readHist.Val))
+	rate = strings.ToLower(cwidgets.ByteFormatShort(w.readHist.Val))
 	w.Lines[0].Title = fmt.Sprintf("read [%s/s]", rate)
 
 	w.writeHist.Append(int(write))
-	rate = strings.ToLower(cwidgets.ByteFormatInt(w.writeHist.Val))
+	rate = strings.ToLower(cwidgets.ByteFormatShort(w.writeHist.Val))
 	w.Lines[1].Title = fmt.Sprintf("write [%s/s]", rate)
 }

cwidgets/single/main.go

@@ -18,6 +18,7 @@ type Single struct {
 	Cpu   *Cpu
 	Mem   *Mem
 	IO    *IO
+	Env   *Env
 	X, Y  int
 	Width int
 }
@@ -32,6 +33,7 @@ func NewSingle(id string) *Single {
 		Cpu:   NewCpu(),
 		Mem:   NewMem(),
 		IO:    NewIO(),
+		Env:   NewEnv(),
 		Width: ui.TermWidth(),
 	}
 }
@@ -52,8 +54,16 @@ func (e *Single) Down() {
 	}
 }
 
-func (e *Single) SetWidth(w int)      { e.Width = w }
-func (e *Single) SetMeta(k, v string) { e.Info.Set(k, v) }
+func (e *Single) SetWidth(w int) { e.Width = w }
+func (e *Single) SetMeta(m models.Meta) {
+	for k, v := range m {
+		if k == "[ENV-VAR]" {
+			e.Env.Set(k, v)
+		} else {
+			e.Info.Set(k, v)
+		}
+	}
+}
 
 func (e *Single) SetMetrics(m models.Metrics) {
 	e.Cpu.Update(m.CPUUtil)
@@ -62,13 +72,14 @@ func (e *Single) SetMetrics(m models.Metrics) {
 	e.IO.Update(m.IOBytesRead, m.IOBytesWrite)
 }
 
-// Return total column height
+// GetHeight returns total column height
 func (e *Single) GetHeight() (h int) {
 	h += e.Info.Height
 	h += e.Net.Height
 	h += e.Cpu.Height
 	h += e.Mem.Height
 	h += e.IO.Height
+	h += e.Env.Height
 	return h
 }
 
@@ -103,6 +114,7 @@ func (e *Single) Buffer() ui.Buffer {
 	buf.Merge(e.Mem.Buffer())
 	buf.Merge(e.Net.Buffer())
 	buf.Merge(e.IO.Buffer())
+	buf.Merge(e.Env.Buffer())
 	return buf
 }
 
@@ -113,6 +125,7 @@ func (e *Single) all() []ui.GridBufferer {
 		e.Mem,
 		e.Net,
 		e.IO,
+		e.Env,
 	}
 }
 

cwidgets/single/mem.go

@@ -70,7 +70,7 @@ func newMemChart() *ui.MBarChart {
 	mbar.BarColor[1] = ui.ColorBlack
 	mbar.NumColor[1] = ui.ColorBlack
 
-	mbar.NumFmt = cwidgets.ByteFormatInt
+	mbar.NumFmt = cwidgets.ByteFormatShort
 	//mbar.ShowScale = true
 	return mbar
 }
@@ -78,6 +78,6 @@ func newMemChart() *ui.MBarChart {
 func (w *Mem) Update(val int, limit int) {
 	w.valHist.Append(val)
 	w.limitHist.Append(limit - val)
-	w.InnerLabel.Text = fmt.Sprintf("%v / %v", cwidgets.ByteFormatInt(val), cwidgets.ByteFormatInt(limit))
+	w.InnerLabel.Text = fmt.Sprintf("%v / %v", cwidgets.ByteFormatShort(val), cwidgets.ByteFormatShort(limit))
 	//w.Data[0] = w.hist.data
 }

cwidgets/single/net.go

@@ -42,10 +42,10 @@ func (w *Net) Update(rx int64, tx int64) {
 	var rate string
 
 	w.rxHist.Append(int(rx))
-	rate = strings.ToLower(cwidgets.ByteFormatInt(w.rxHist.Val))
+	rate = strings.ToLower(cwidgets.ByteFormat(w.rxHist.Val))
 	w.Lines[0].Title = fmt.Sprintf("RX [%s/s]", rate)
 
 	w.txHist.Append(int(tx))
-	rate = strings.ToLower(cwidgets.ByteFormatInt(w.txHist.Val))
+	rate = strings.ToLower(cwidgets.ByteFormat(w.txHist.Val))
 	w.Lines[1].Title = fmt.Sprintf("TX [%s/s]", rate)
 }

cwidgets/util.go

@@ -1,53 +1,74 @@
 package cwidgets
 
 import (
-	"fmt"
 	"strconv"
 )
 
 const (
-	kb = 1024
-	mb = kb * 1024
-	gb = mb * 1024
-	tb = gb * 1024
+	// byte ratio constants
+	_           = iota
+	kib float64 = 1 << (10 * iota)
+	mib
+	gib
+	tib
+	pib
 )
 
-// convenience method
-func ByteFormatInt(n int) string {
-	return ByteFormat(int64(n))
+var (
+	units = []float64{
+		1,
+		kib,
+		mib,
+		gib,
+		tib,
+		pib,
+	}
+
+	// short, full unit labels
+	labels = [][2]string{
+		[2]string{"B", "B"},
+		[2]string{"K", "KiB"},
+		[2]string{"M", "MiB"},
+		[2]string{"G", "GiB"},
+		[2]string{"T", "TiB"},
+		[2]string{"P", "PiB"},
+	}
+)
+
+// convenience methods
+func ByteFormat(n int) string          { return byteFormat(float64(n), false) }
+func ByteFormatShort(n int) string     { return byteFormat(float64(n), true) }
+func ByteFormat64(n int64) string      { return byteFormat(float64(n), false) }
+func ByteFormat64Short(n int64) string { return byteFormat(float64(n), true) }
+
+func byteFormat(n float64, short bool) string {
+	i := len(units) - 1
+
+	for i > 0 {
+		if n >= units[i] {
+			n /= units[i]
+			break
+		}
+		i--
+	}
+
+	if short {
+		return unpadFloat(n, 0) + labels[i][0]
+	}
+	return unpadFloat(n, 2) + labels[i][1]
 }
 
-func ByteFormat(n int64) string {
-	if n < kb {
-		return fmt.Sprintf("%sB", strconv.FormatInt(n, 10))
-	}
-	if n < mb {
-		n = n / kb
-		return fmt.Sprintf("%sK", strconv.FormatInt(n, 10))
-	}
-	if n < gb {
-		n = n / mb
-		return fmt.Sprintf("%sM", strconv.FormatInt(n, 10))
-	}
-	if n < tb {
-		nf := float64(n) / gb
-		return fmt.Sprintf("%sG", unpadFloat(nf))
-	}
-	nf := float64(n) / tb
-	return fmt.Sprintf("%sT", unpadFloat(nf))
+func unpadFloat(f float64, maxp int) string {
+	return strconv.FormatFloat(f, 'f', getPrecision(f, maxp), 64)
 }
 
-func unpadFloat(f float64) string {
-	return strconv.FormatFloat(f, 'f', getPrecision(f), 64)
-}
-
-func getPrecision(f float64) int {
+func getPrecision(f float64, maxp int) int {
 	frac := int((f - float64(int(f))) * 100)
-	if frac == 0 {
+	if frac == 0 || maxp == 0 {
 		return 0
 	}
-	if frac%10 == 0 {
+	if frac%10 == 0 || maxp < 2 {
 		return 1
 	}
-	return 2 // default precision
+	return maxp
 }

go.mod

@@ -0,0 +1,21 @@
+module github.com/bcicen/ctop
+
+require (
+	github.com/BurntSushi/toml v0.3.1
+	github.com/c9s/goprocinfo v0.0.0-20170609001544-b34328d6e0cd
+	github.com/fsouza/go-dockerclient v1.6.6
+	github.com/gizak/termui v2.3.0+incompatible
+	github.com/jgautheron/codename-generator v0.0.0-20150829203204-16d037c7cc3c
+	github.com/mattn/go-runewidth v0.0.0-20170201023540-14207d285c6c // indirect
+	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
+	github.com/nsf/termbox-go v0.0.0-20180303152453-e2050e41c884
+	github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d
+	github.com/op/go-logging v0.0.0-20160211212156-b2cb9fa56473
+	github.com/opencontainers/runc v1.0.0-rc92
+	github.com/pkg/errors v0.9.1
+	github.com/stretchr/testify v1.4.0
+)
+
+replace github.com/gizak/termui => github.com/bcicen/termui v0.0.0-20180326052246-4eb80249d3f5
+
+go 1.15

go.sum

@@ -0,0 +1,280 @@
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+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
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grid.go

@@ -6,6 +6,44 @@ import (
 	ui "github.com/gizak/termui"
 )
 
+func ShowConnError(err error) (exit bool) {
+	ui.Clear()
+	ui.DefaultEvtStream.ResetHandlers()
+	defer ui.DefaultEvtStream.ResetHandlers()
+
+	setErr := func(err error) {
+		errView.Append(err.Error())
+		errView.Append("attempting to reconnect...")
+		ui.Render(errView)
+	}
+
+	HandleKeys("exit", func() {
+		exit = true
+		ui.StopLoop()
+	})
+
+	ui.Handle("/timer/1s", func(ui.Event) {
+		_, err := cursor.RefreshContainers()
+		if err == nil {
+			ui.StopLoop()
+			return
+		}
+		setErr(err)
+	})
+
+	ui.Handle("/sys/wnd/resize", func(e ui.Event) {
+		errView.Resize()
+		ui.Clear()
+		ui.Render(errView)
+		log.Infof("RESIZE")
+	})
+
+	errView.Resize()
+	setErr(err)
+	ui.Loop()
+	return exit
+}
+
 func RedrawRows(clr bool) {
 	// reinit body rows
 	cGrid.Clear()
@@ -33,7 +71,6 @@ func RedrawRows(clr bool) {
 	}
 	cGrid.Align()
 	ui.Render(cGrid)
-
 }
 
 func SingleView() MenuFn {
@@ -68,16 +105,21 @@ func SingleView() MenuFn {
 	return nil
 }
 
-func RefreshDisplay() {
+func RefreshDisplay() error {
 	// skip display refresh during scroll
 	if !cursor.isScrolling {
-		needsClear := cursor.RefreshContainers()
+		needsClear, err := cursor.RefreshContainers()
+		if err != nil {
+			return err
+		}
 		RedrawRows(needsClear)
 	}
+	return nil
 }
 
 func Display() bool {
 	var menu MenuFn
+	var connErr error
 
 	cGrid.SetWidth(ui.TermWidth())
 	ui.DefaultEvtStream.Hook(logEvent)
@@ -104,17 +146,32 @@ func Display() bool {
 		menu = ContainerMenu
 		ui.StopLoop()
 	})
+	ui.Handle("/sys/kbd/<left>", func(ui.Event) {
+		menu = LogMenu
+		ui.StopLoop()
+	})
+	ui.Handle("/sys/kbd/<right>", func(ui.Event) {
+		menu = SingleView
+		ui.StopLoop()
+	})
 	ui.Handle("/sys/kbd/l", func(ui.Event) {
 		menu = LogMenu
 		ui.StopLoop()
 	})
+	ui.Handle("/sys/kbd/e", func(ui.Event) {
+		menu = ExecShell
+		ui.StopLoop()
+	})
 	ui.Handle("/sys/kbd/o", func(ui.Event) {
 		menu = SingleView
 		ui.StopLoop()
 	})
 	ui.Handle("/sys/kbd/a", func(ui.Event) {
 		config.Toggle("allContainers")
-		RefreshDisplay()
+		connErr = RefreshDisplay()
+		if connErr != nil {
+			ui.StopLoop()
+		}
 	})
 	ui.Handle("/sys/kbd/D", func(ui.Event) {
 		dumpContainer(cursor.Selected())
@@ -134,6 +191,10 @@ func Display() bool {
 		menu = SortMenu
 		ui.StopLoop()
 	})
+	ui.Handle("/sys/kbd/c", func(ui.Event) {
+		menu = ColumnsMenu
+		ui.StopLoop()
+	})
 	ui.Handle("/sys/kbd/S", func(ui.Event) {
 		path, err := config.Write()
 		if err == nil {
@@ -148,7 +209,10 @@ func Display() bool {
 		if log.StatusQueued() {
 			ui.StopLoop()
 		}
-		RefreshDisplay()
+		connErr = RefreshDisplay()
+		if connErr != nil {
+			ui.StopLoop()
+		}
 	})
 
 	ui.Handle("/sys/wnd/resize", func(e ui.Event) {
@@ -162,6 +226,10 @@ func Display() bool {
 
 	ui.Loop()
 
+	if connErr != nil {
+		return ShowConnError(connErr)
+	}
+
 	if log.StatusQueued() {
 		for sm := range log.FlushStatus() {
 			if sm.IsError {

install.sh

@@ -5,6 +5,10 @@ KERNEL=$(uname -s)
 
 function output() { echo -e "\033[32mctop-install\033[0m $@"; }
 
+function command_exists() {
+  command -v "$@" > /dev/null 2>&1
+}
+
 # extract github download url matching pattern
 function extract_url() {
   match=$1; shift
@@ -28,6 +32,26 @@ case $KERNEL in
     ;;
 esac
 
+for req in curl wget; do
+  command_exists $req || {
+    output "missing required $req binary"
+    req_failed=1
+  }
+done
+[ "$req_failed" == 1 ] && exit 1
+
+sh_c='sh -c'
+if [ "$CURRENT_USER" != 'root' ]; then
+  if command_exists sudo; then
+    sh_c='sudo -E sh -c'
+  elif command_exists su; then
+    sh_c='su -c'
+  else
+    output "Error: this installer needs the ability to run commands as root. We are unable to find either "sudo" or "su" available to make this happen."
+    exit 1
+  fi
+fi
+
 TMP=$(mktemp -d "${TMPDIR:-/tmp}/ctop.XXXXX")
 cd ${TMP}
 
@@ -55,6 +79,6 @@ wget -q --show-progress $url
 
 output "installing to /usr/local/bin"
 chmod +x ctop-*
-sudo mv ctop-* /usr/local/bin/ctop
+$sh_c "mv ctop-* /usr/local/bin/ctop"
 
 output "done!"

logging/server.go

@@ -2,6 +2,7 @@ package logging
 
 import (
 	"fmt"
+	"io"
 	"net"
 	"sync"
 )
@@ -56,13 +57,13 @@ func StopServer() {
 	}
 }
 
-func handler(conn net.Conn) {
+func handler(wc io.WriteCloser) {
 	server.wg.Add(1)
 	defer server.wg.Done()
-	defer conn.Close()
+	defer wc.Close()
 	for msg := range Log.tail() {
 		msg = fmt.Sprintf("%s\n", msg)
-		conn.Write([]byte(msg))
+		wc.Write([]byte(msg))
 	}
-	conn.Write([]byte("bye\n"))
+	wc.Write([]byte("bye\n"))
 }

main.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"runtime"
+	"strings"
 
 	"github.com/bcicen/ctop/config"
 	"github.com/bcicen/ctop/connector"
@@ -21,11 +22,12 @@ var (
 	version   = "dev-build"
 	goVersion = runtime.Version()
 
-	log    *logging.CTopLogger
-	cursor *GridCursor
-	cGrid  *compact.CompactGrid
-	header *widgets.CTopHeader
-	status *widgets.StatusLine
+	log     *logging.CTopLogger
+	cursor  *GridCursor
+	cGrid   *compact.CompactGrid
+	header  *widgets.CTopHeader
+	status  *widgets.StatusLine
+	errView *widgets.ErrorView
 
 	versionStr = fmt.Sprintf("ctop version %v, build %v %v", version, build, goVersion)
 )
@@ -44,6 +46,7 @@ func main() {
 		invertFlag      = flag.Bool("i", false, "invert default colors")
 		scaleCpu        = flag.Bool("scale-cpu", false, "show cpu as % of system total")
 		connectorFlag   = flag.String("connector", "docker", "container connector to use")
+		defaultShell    = flag.String("shell", "sh", "exec shell to use")
 	)
 	flag.Parse()
 
@@ -62,7 +65,9 @@ func main() {
 
 	// init global config and read config file if exists
 	config.Init()
-	config.Read()
+	if err := config.Read(); err != nil {
+		log.Warningf("reading config: %s", err)
+	}
 
 	// override default config values with command line flags
 	if *filterFlag != "" {
@@ -86,6 +91,10 @@ func main() {
 		config.Toggle("scaleCpu")
 	}
 
+	if *defaultShell != "" {
+		config.Update("shell", *defaultShell)
+	}
+
 	// init ui
 	if *invertFlag {
 		InvertColorMap()
@@ -94,17 +103,19 @@ func main() {
 	if err := ui.Init(); err != nil {
 		panic(err)
 	}
+	tm.SetInputMode(tm.InputAlt)
 
 	defer Shutdown()
 	// init grid, cursor, header
-	conn, err := connector.ByName(*connectorFlag)
+	cSuper, err := connector.ByName(*connectorFlag)
 	if err != nil {
 		panic(err)
 	}
-	cursor = &GridCursor{cSource: conn}
+	cursor = &GridCursor{cSuper: cSuper}
 	cGrid = compact.NewCompactGrid()
 	header = widgets.NewCTopHeader()
 	status = widgets.NewStatusLine()
+	errView = widgets.NewErrorView()
 
 	for {
 		exit := Display()
@@ -133,12 +144,13 @@ func validSort(s string) {
 func panicExit() {
 	if r := recover(); r != nil {
 		Shutdown()
+		panic(r)
 		fmt.Printf("error: %s\n", r)
 		os.Exit(1)
 	}
 }
 
-var helpMsg = `ctop - container metric viewer
+var helpMsg = `ctop - interactive container viewer
 
 usage: ctop [options]
 
@@ -148,4 +160,6 @@ options:
 func printHelp() {
 	fmt.Println(helpMsg)
 	flag.PrintDefaults()
+	fmt.Printf("\navailable connectors: ")
+	fmt.Println(strings.Join(connector.Enabled(), ", "))
 }

menus.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/bcicen/ctop/config"
@@ -25,6 +26,8 @@ var helpDialog = []menu.Item{
 	{"[r] - reverse container sort order", ""},
 	{"[o] - open single view", ""},
 	{"[l] - view container logs ([t] to toggle timestamp when open)", ""},
+	{"[e] - exec shell", ""},
+	{"[c] - configure columns", ""},
 	{"[S] - save current configuration to file", ""},
 	{"[q] - exit ctop", ""},
 }
@@ -37,7 +40,10 @@ func HelpMenu() MenuFn {
 	m := menu.NewMenu()
 	m.BorderLabel = "Help"
 	m.AddItems(helpDialog...)
-	ui.Render(m)
+	ui.Handle("/sys/wnd/resize", func(e ui.Event) {
+		ui.Clear()
+		ui.Render(m)
+	})
 	ui.Handle("/sys/kbd/", func(ui.Event) {
 		ui.StopLoop()
 	})
@@ -100,7 +106,90 @@ func SortMenu() MenuFn {
 	HandleKeys("exit", ui.StopLoop)
 
 	ui.Handle("/sys/kbd/<enter>", func(ui.Event) {
-		config.Update("sortField", m.SelectedItem().Val)
+		config.Update("sortField", m.SelectedValue())
+		ui.StopLoop()
+	})
+
+	ui.Render(m)
+	ui.Loop()
+	return nil
+}
+
+func ColumnsMenu() MenuFn {
+	const (
+		enabledStr  = "[X]"
+		disabledStr = "[ ]"
+		padding     = 2
+	)
+
+	ui.Clear()
+	ui.DefaultEvtStream.ResetHandlers()
+	defer ui.DefaultEvtStream.ResetHandlers()
+
+	m := menu.NewMenu()
+	m.Selectable = true
+	m.SortItems = false
+	m.BorderLabel = "Columns"
+	//m.SubText = "Enabled Columns"
+
+	rebuild := func() {
+		// get padding for right alignment of enabled status
+		var maxLen int
+		for _, col := range config.GlobalColumns {
+			if len(col.Label) > maxLen {
+				maxLen = len(col.Label)
+			}
+		}
+		maxLen += padding
+
+		// rebuild menu items
+		m.ClearItems()
+		for _, col := range config.GlobalColumns {
+			txt := col.Label + strings.Repeat(" ", maxLen-len(col.Label))
+			if col.Enabled {
+				txt += enabledStr
+			} else {
+				txt += disabledStr
+			}
+			m.AddItems(menu.Item{col.Name, txt})
+		}
+	}
+
+	upFn := func() {
+		config.ColumnLeft(m.SelectedValue())
+		m.Up()
+		rebuild()
+	}
+
+	downFn := func() {
+		config.ColumnRight(m.SelectedValue())
+		m.Down()
+		rebuild()
+	}
+
+	toggleFn := func() {
+		config.ColumnToggle(m.SelectedValue())
+		rebuild()
+	}
+
+	rebuild()
+
+	HandleKeys("up", m.Up)
+	HandleKeys("down", m.Down)
+	HandleKeys("enter", toggleFn)
+	HandleKeys("pgup", upFn)
+	HandleKeys("pgdown", downFn)
+
+	ui.Handle("/sys/kbd/x", func(ui.Event) { toggleFn() })
+	ui.Handle("/sys/kbd/<enter>", func(ui.Event) { toggleFn() })
+
+	HandleKeys("exit", func() {
+		cSource, err := cursor.cSuper.Get()
+		if err == nil {
+			for _, c := range cSource.All() {
+				c.RecreateWidgets()
+			}
+		}
 		ui.StopLoop()
 	})
 
@@ -123,44 +212,111 @@ func ContainerMenu() MenuFn {
 	m.BorderLabel = "Menu"
 
 	items := []menu.Item{
-		menu.Item{Val: "single", Label: "single view"},
-		menu.Item{Val: "logs", Label: "log view"},
+		menu.Item{Val: "single", Label: "[o] single view"},
+		menu.Item{Val: "logs", Label: "[l] log view"},
 	}
 
 	if c.Meta["state"] == "running" {
-		items = append(items, menu.Item{Val: "stop", Label: "stop"})
+		items = append(items, menu.Item{Val: "stop", Label: "[s] stop"})
+		items = append(items, menu.Item{Val: "pause", Label: "[p] pause"})
+		items = append(items, menu.Item{Val: "restart", Label: "[r] restart"})
+		items = append(items, menu.Item{Val: "exec", Label: "[e] exec shell"})
 	}
 	if c.Meta["state"] == "exited" || c.Meta["state"] == "created" {
-		items = append(items, menu.Item{Val: "start", Label: "start"})
-		items = append(items, menu.Item{Val: "remove", Label: "remove"})
+		items = append(items, menu.Item{Val: "start", Label: "[s] start"})
+		items = append(items, menu.Item{Val: "remove", Label: "[R] remove"})
 	}
-	items = append(items, menu.Item{Val: "cancel", Label: "cancel"})
+	if c.Meta["state"] == "paused" {
+		items = append(items, menu.Item{Val: "unpause", Label: "[p] unpause"})
+	}
+	items = append(items, menu.Item{Val: "cancel", Label: "[c] cancel"})
 
 	m.AddItems(items...)
 	ui.Render(m)
 
-	var nextMenu MenuFn
 	HandleKeys("up", m.Up)
 	HandleKeys("down", m.Down)
+
+	var selected string
+
+	// shortcuts
+	ui.Handle("/sys/kbd/o", func(ui.Event) {
+		selected = "single"
+		ui.StopLoop()
+	})
+	ui.Handle("/sys/kbd/l", func(ui.Event) {
+		selected = "logs"
+		ui.StopLoop()
+	})
+	if c.Meta["state"] != "paused" {
+		ui.Handle("/sys/kbd/s", func(ui.Event) {
+			if c.Meta["state"] == "running" {
+				selected = "stop"
+			} else {
+				selected = "start"
+			}
+			ui.StopLoop()
+		})
+	}
+	if c.Meta["state"] != "exited" || c.Meta["state"] != "created" {
+		ui.Handle("/sys/kbd/p", func(ui.Event) {
+			if c.Meta["state"] == "paused" {
+				selected = "unpause"
+			} else {
+				selected = "pause"
+			}
+			ui.StopLoop()
+		})
+	}
+	if c.Meta["state"] == "running" {
+		ui.Handle("/sys/kbd/e", func(ui.Event) {
+			selected = "exec"
+			ui.StopLoop()
+		})
+		ui.Handle("/sys/kbd/r", func(ui.Event) {
+			selected = "restart"
+			ui.StopLoop()
+		})
+	}
+	ui.Handle("/sys/kbd/R", func(ui.Event) {
+		selected = "remove"
+		ui.StopLoop()
+	})
+	ui.Handle("/sys/kbd/c", func(ui.Event) {
+		ui.StopLoop()
+	})
+
 	ui.Handle("/sys/kbd/<enter>", func(ui.Event) {
-		switch m.SelectedItem().Val {
-		case "single":
-			nextMenu = SingleView
-		case "logs":
-			nextMenu = LogMenu
-		case "start":
-			nextMenu = Confirm(confirmTxt("start", c.GetMeta("name")), c.Start)
-		case "stop":
-			nextMenu = Confirm(confirmTxt("stop", c.GetMeta("name")), c.Stop)
-		case "remove":
-			nextMenu = Confirm(confirmTxt("remove", c.GetMeta("name")), c.Remove)
-		}
+		selected = m.SelectedValue()
 		ui.StopLoop()
 	})
 	ui.Handle("/sys/kbd/", func(ui.Event) {
 		ui.StopLoop()
 	})
 	ui.Loop()
+
+	var nextMenu MenuFn
+	switch selected {
+	case "single":
+		nextMenu = SingleView
+	case "logs":
+		nextMenu = LogMenu
+	case "exec":
+		nextMenu = ExecShell
+	case "start":
+		nextMenu = Confirm(confirmTxt("start", c.GetMeta("name")), c.Start)
+	case "stop":
+		nextMenu = Confirm(confirmTxt("stop", c.GetMeta("name")), c.Stop)
+	case "remove":
+		nextMenu = Confirm(confirmTxt("remove", c.GetMeta("name")), c.Remove)
+	case "pause":
+		nextMenu = Confirm(confirmTxt("pause", c.GetMeta("name")), c.Pause)
+	case "unpause":
+		nextMenu = Confirm(confirmTxt("unpause", c.GetMeta("name")), c.Unpause)
+	case "restart":
+		nextMenu = Confirm(confirmTxt("restart", c.GetMeta("name")), c.Restart)
+	}
+
 	return nextMenu
 }
 
@@ -176,7 +332,7 @@ func LogMenu() MenuFn {
 
 	logs, quit := logReader(c)
 	m := widgets.NewTextView(logs)
-	m.BorderLabel = "Logs"
+	m.BorderLabel = fmt.Sprintf("Logs [%s]", c.GetMeta("name"))
 	ui.Render(m)
 
 	ui.Handle("/sys/wnd/resize", func(e ui.Event) {
@@ -193,6 +349,24 @@ func LogMenu() MenuFn {
 	return nil
 }
 
+func ExecShell() MenuFn {
+	c := cursor.Selected()
+
+	if c == nil {
+		return nil
+	}
+
+	ui.DefaultEvtStream.ResetHandlers()
+	defer ui.DefaultEvtStream.ResetHandlers()
+
+	shell := config.Get("shell")
+	if err := c.Exec([]string{shell.Val, "-c", "printf '\\e[0m\\e[?25h' && clear && " + shell.Val}); err != nil {
+		log.Fatal(err)
+	}
+
+	return nil
+}
+
 // Create a confirmation dialog with a given description string and
 // func to perform if confirmed
 func Confirm(txt string, fn func()) MenuFn {
@@ -232,7 +406,7 @@ func Confirm(txt string, fn func()) MenuFn {
 		ui.Handle("/sys/kbd/y", func(ui.Event) { yes() })
 
 		ui.Handle("/sys/kbd/<enter>", func(ui.Event) {
-			switch m.SelectedItem().Val {
+			switch m.SelectedValue() {
 			case "cancel":
 				no()
 			case "yes":

models/main.go

@@ -7,6 +7,29 @@ type Log struct {
 	Message   string
 }
 
+type Meta map[string]string
+
+// NewMeta returns an initialized Meta map.
+// An optional series of key, values may be provided to populate the map prior to returning
+func NewMeta(kvs ...string) Meta {
+	m := make(Meta)
+
+	var i int
+	for i < len(kvs)-1 {
+		m[kvs[i]] = kvs[i+1]
+		i += 2
+	}
+
+	return m
+}
+
+func (m Meta) Get(k string) string {
+	if s, ok := m[k]; ok {
+		return s
+	}
+	return ""
+}
+
 type Metrics struct {
 	CPUUtil      int
 	NetTx        int64

widgets/error.go

@@ -0,0 +1,60 @@
+package widgets
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	ui "github.com/gizak/termui"
+)
+
+type ErrorView struct {
+	*ui.Par
+	lines []string
+}
+
+func NewErrorView() *ErrorView {
+	const yPad = 1
+	const xPad = 2
+
+	p := ui.NewPar("")
+	p.X = xPad
+	p.Y = yPad
+	p.Border = true
+	p.Height = 10
+	p.Width = 20
+	p.PaddingTop = yPad
+	p.PaddingBottom = yPad
+	p.PaddingLeft = xPad
+	p.PaddingRight = xPad
+	p.BorderLabel = " ctop - error "
+	p.Bg = ui.ThemeAttr("bg")
+	p.TextFgColor = ui.ThemeAttr("status.warn")
+	p.TextBgColor = ui.ThemeAttr("menu.text.bg")
+	p.BorderFg = ui.ThemeAttr("status.warn")
+	p.BorderLabelFg = ui.ThemeAttr("status.warn")
+	return &ErrorView{p, make([]string, 0, 50)}
+}
+
+func (w *ErrorView) Append(s string) {
+	if len(w.lines)+2 >= cap(w.lines) {
+		w.lines = append(w.lines[:0], w.lines[2:]...)
+	}
+	ts := time.Now().Local().Format("15:04:05 MST")
+	w.lines = append(w.lines, fmt.Sprintf("[%s] %s", ts, s))
+	w.lines = append(w.lines, "")
+}
+
+func (w *ErrorView) Buffer() ui.Buffer {
+	offset := len(w.lines) - w.InnerHeight()
+	if offset < 0 {
+		offset = 0
+	}
+	w.Text = strings.Join(w.lines[offset:len(w.lines)], "\n")
+	return w.Par.Buffer()
+}
+
+func (w *ErrorView) Resize() {
+	w.Height = ui.TermHeight() - (w.PaddingTop + w.PaddingBottom)
+	w.SetWidth(ui.TermWidth() - (w.PaddingLeft + w.PaddingRight))
+}

widgets/header.go

@@ -16,7 +16,7 @@ type CTopHeader struct {
 
 func NewCTopHeader() *CTopHeader {
 	return &CTopHeader{
-		Time:   headerPar(2, timeStr()),
+		Time:   headerPar(2, ""),
 		Count:  headerPar(24, "-"),
 		Filter: headerPar(40, ""),
 		bg:     headerBg(),

widgets/input.go

@@ -77,7 +77,7 @@ func (i *Input) KeyPress(e ui.Event) {
 	if len(i.Data) >= i.MaxLen {
 		return
 	}
-	if strings.Index(input_chars, ch) > -1 {
+	if strings.Contains(input_chars, ch) {
 		i.Data += ch
 		i.stream <- i.Data
 		ui.Render(i)

widgets/menu/main.go

@@ -11,13 +11,14 @@ type Padding [2]int // x,y padding
 type Menu struct {
 	ui.Block
 	SortItems   bool   // enable automatic sorting of menu items
+	Selectable  bool   // whether menu is navigable
 	SubText     string // optional text to display before items
 	TextFgColor ui.Attribute
 	TextBgColor ui.Attribute
-	Selectable  bool
 	cursorPos   int
 	items       Items
 	padding     Padding
+	toolTip     *ToolTip
 }
 
 func NewMenu() *Menu {
@@ -42,7 +43,7 @@ func (m *Menu) AddItems(items ...Item) {
 	m.refresh()
 }
 
-// Remove menu item by value or label
+// DelItem removes menu item by value or label
 func (m *Menu) DelItem(s string) (success bool) {
 	for n, i := range m.items {
 		if i.Val == s || i.Label == s {
@@ -55,6 +56,11 @@ func (m *Menu) DelItem(s string) (success bool) {
 	return success
 }
 
+// ClearItems removes all current menu items
+func (m *Menu) ClearItems() {
+	m.items = m.items[:0]
+}
+
 // Move cursor to an position by Item value or label
 func (m *Menu) SetCursor(s string) (success bool) {
 	for n, i := range m.items {
@@ -66,19 +72,19 @@ func (m *Menu) SetCursor(s string) (success bool) {
 	return false
 }
 
-// Sort menu items(if enabled) and re-calculate window size
-func (m *Menu) refresh() {
-	if m.SortItems {
-		sort.Sort(m.items)
-	}
-	m.calcSize()
-	ui.Render(m)
+// SetToolTip sets an optional tooltip string to show at bottom of screen
+func (m *Menu) SetToolTip(lines ...string) {
+	m.toolTip = NewToolTip(lines...)
 }
 
 func (m *Menu) SelectedItem() Item {
 	return m.items[m.cursorPos]
 }
 
+func (m *Menu) SelectedValue() string {
+	return m.items[m.cursorPos].Val
+}
+
 func (m *Menu) Buffer() ui.Buffer {
 	var cell ui.Cell
 	buf := m.Block.Buffer()
@@ -108,6 +114,10 @@ func (m *Menu) Buffer() ui.Buffer {
 		}
 	}
 
+	if m.toolTip != nil {
+		buf.Merge(m.toolTip.Buffer())
+	}
+
 	return buf
 }
 
@@ -125,6 +135,15 @@ func (m *Menu) Down() {
 	}
 }
 
+// Sort menu items(if enabled) and re-calculate window size
+func (m *Menu) refresh() {
+	if m.SortItems {
+		sort.Sort(m.items)
+	}
+	m.calcSize()
+	ui.Render(m)
+}
+
 // Set width and height based on menu items
 func (m *Menu) calcSize() {
 	m.Width = 7 // minimum width

widgets/menu/tooltip.go

@@ -0,0 +1,55 @@
+package menu
+
+import (
+	ui "github.com/gizak/termui"
+)
+
+type ToolTip struct {
+	ui.Block
+	Lines       []string
+	TextFgColor ui.Attribute
+	TextBgColor ui.Attribute
+	padding     Padding
+}
+
+func NewToolTip(lines ...string) *ToolTip {
+	t := &ToolTip{
+		Block:       *ui.NewBlock(),
+		Lines:       lines,
+		TextFgColor: ui.ThemeAttr("menu.text.fg"),
+		TextBgColor: ui.ThemeAttr("menu.text.bg"),
+		padding:     Padding{2, 1},
+	}
+	t.BorderFg = ui.ThemeAttr("menu.border.fg")
+	t.BorderLabelFg = ui.ThemeAttr("menu.label.fg")
+	t.X = 1
+	t.Align()
+	return t
+}
+
+func (t *ToolTip) Buffer() ui.Buffer {
+	var cell ui.Cell
+	buf := t.Block.Buffer()
+
+	y := t.Y + t.padding[1]
+
+	for n, line := range t.Lines {
+		x := t.X + t.padding[0]
+		for _, ch := range line {
+			cell = ui.Cell{Ch: ch, Fg: t.TextFgColor, Bg: t.TextBgColor}
+			buf.Set(x, y+n, cell)
+			x++
+		}
+	}
+
+	return buf
+}
+
+// Set width and height based on screen size
+func (t *ToolTip) Align() {
+	t.Width = ui.TermWidth() - (t.padding[0] * 2)
+	t.Height = len(t.Lines) + (t.padding[1] * 2)
+	t.Y = ui.TermHeight() - t.Height
+
+	t.Block.Align()
+}