Shell

godoc

import "barista.run/modules/shell"

Show the output of a shell command on the bar: shell.New("sh", "-c", "whoami").
Show the last line of output from a long-running shell command: shell.Tail("dmesg").

Configuration

• Output(func(string) bar.Output): Sets the output format. For New(), this function is given the complete, trimmed output from the command. For Tail() it is given a single line from the output.

• Every(time.Duration): Only for New(), sets the interval at which the command should be repeated. If not set, or set to a zero duration, disables automatic refresh.

• Refresh: Refreshes the output. For New(), also re-runs the command. For Tail() re-uses the last line of output. Can be used if the output format has a time, or in click handlers, e.g.

  s.Output(func (in string) bar.Output {
  	return outputs.Text(in).OnClick(ifLeft(s.Refresh))
  })
  

Examples

8 chrome procs

Show a count of chrome processes, refreshed every second:

chromeCount := shell.New("pgrep", "-c", "chrome").
	Every(time.Second).
	Output(func(count string) bar.Output {
		return outputs.Textf("%s chrome procs", count)
	})

(22m15s ago) wlp60s0: associated

Show the last line of dmesg output, with human readable time deltas:

var dmesgFormat = regexp.MustCompile(`^\[([0-9\.]+)\] (.*)$`)
dmesg := shell.Tail("dmesg", "-w").Output(func(line string) bar.Output {
	res := dmesgFormat.FindStringSubmatch(line) // res[1] = time, res[2] = message
	timeOfMsg, _ := strconv.ParseFloat(res[1], 64)
	outLine := res[2]
	if len(outLine) > 20 {
		outLine = outLine[0:19] + "…"
	}

	return outputs.Repeat(func(time.Time) bar.Output {
		uptimeStr, _ := ioutil.ReadFile("/proc/uptime") // uptimeStr = "$uptime $cputime"
		timeNow, _ := strconv.ParseFloat(strings.Split(string(uptimeStr), " ")[0], 64)
		delta := time.Duration(uint64(timeNow-timeOfMsg)) * time.Second
		return outputs.Textf("(%v ago) %s", delta, outLine)
	}).Every(time.Second)
})