~/.bin/working-time.go: Notify about break duration

This also adds a permanent notification if you're taking a break, so you
don't forget to end it.

.bin/working-time.go

	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"path"
	"time"
)
			dur := now.Sub(*day.BreakStart)
			day.Break += dur
			day.BreakStart = nil
			notifyCompletion(fmt.Sprintf("took a %s break", dur), 0)
			fmt.Fprintf(os.Stderr, "took a %s break\n", dur)
		} else {
			day.BreakStart = &now
			notifyCompletion("taking a break", 10*time.Hour)
		}
		writeDay(dayFile, day)
	}
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		notifyCompletion(fmt.Sprintf("took a %s break", dur), 0)
		fmt.Fprintf(os.Stderr, "took a %s break\n", dur)
		day.Break += dur
		writeDay(dayFile, day)
		os.Exit(1)
	}
}
func notifyCompletion(msg string, dur time.Duration) {
	args := make([]string, 0, 1)
	if dur != 0 {
		args = append(args, "--expire-time", fmt.Sprintf("%d", int(dur.Seconds()*1000)))
	}
	args = append(args, msg)
	notifyCmd := exec.Command("notify-send", args...)
	notifyCmd.Run()
}