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|
#!/usr/bin/env yaegi
// # Documentation
// we try to read a file pointed to by WAYBAR_TODO_FILE.
// While no particular format is assumed, we recommend
// Markdown.
// We extract the todos from the top-level list items
// (listings start with a `*` character).
//
// # Usage:
// go build -o waybar-todo todo.go
package main
import (
"bufio"
"encoding/json"
"log"
"os"
"os/signal"
"regexp"
"runtime"
"strings"
"time"
"github.com/fsnotify/fsnotify"
"golang.org/x/sys/unix"
)
const (
TODO_INACTIVE_STRING string = ""
TODO_LABEL_REGEX string = `\[\[!(.*)\]\]`
)
var (
active = true
todofile = os.Getenv("WAYBAR_TODO_FILE")
cookiefile = os.ExpandEnv("${XDG_RUNTIME_DIR}/waybar-todo.cookie")
labelFilter = os.Getenv("WAYBAR_TODO_FILTER")
)
func printJson(text, tooltip string, class []string, alt string, percentage int) error {
return json.NewEncoder(os.Stdout).Encode(map[string]interface{}{
"text": text,
"tooltip": tooltip,
"class": class,
"alt": alt,
"percentage": percentage,
})
}
type todoItem struct {
text string
label string
}
func readTodofile2(path string) ([]todoItem, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
var todos []todoItem
for lr := bufio.NewScanner(f); lr.Scan(); {
skip := 0
switch {
case strings.HasPrefix(lr.Text(), "*"):
skip = 2
case strings.HasPrefix(lr.Text(), "- [ ]"):
skip = 6
case strings.HasPrefix(lr.Text(), "- [x]"):
fallthrough
default:
continue
}
ti := todoItem{text: lr.Text()[skip:]}
matches := labelre.FindAllStringSubmatch(ti.text, -1)
if matches != nil && len(matches) > 0 {
ti.label = matches[0][1]
ti.text = strings.TrimSpace(
strings.Replace(ti.text, matches[0][0], "", 1))
}
todos = append(todos, ti)
}
return todos, nil
}
func setCookie(active bool) error {
if !active {
_, err := os.Create(cookiefile)
return err
}
return os.Remove(cookiefile)
}
func update() error {
if _, err := os.Stat(cookiefile); err == nil {
log.Printf("cookie set, we're inactive")
active = false
}
if !active {
return printJson(TODO_INACTIVE_STRING, "* inactive *", []string{"off"}, "off", 0)
}
todos, err := readTodofile2(todofile)
if err != nil {
return err
}
var (
text string
tooltip []string
extraClass string
)
for _, item := range todos {
if labelFilter != "" && strings.Contains(labelFilter, item.label) {
continue
}
if text == "" {
text = item.text
extraClass = item.label
continue
}
// render out the rest of the todos into the tooltip
tooltip = append(tooltip, item.text)
}
return printJson(text, strings.Join(tooltip, "\n"), []string{"on", extraClass}, "on", 1)
}
var labelre *regexp.Regexp
func init() {
labelre = regexp.MustCompile(TODO_LABEL_REGEX)
}
func main() {
runtime.GOMAXPROCS(1)
var (
updateC = make(chan os.Signal, 1)
cancelC = make(chan os.Signal, 1)
)
signal.Notify(updateC, unix.SIGUSR1, unix.SIGUSR2, unix.SIGHUP)
signal.Notify(cancelC, unix.SIGTERM, unix.SIGINT)
var err error
// we will receive a SIGTERM if our parent dies
err = unix.Prctl(unix.PR_SET_PDEATHSIG, uintptr(unix.SIGTERM), 0, 0, 0)
if err != nil {
log.Fatalf("error: setting prctl: %v", err)
}
if todofile == "" {
panic("missing TODO file")
// // get from nb(1)
// nb := exec.Command("sh", "-c", "nb show --no-color --path todo")
// nb_output, err := nb.Output()
// if err != nil {
// e := err.(*exec.ExitError)
// log.Fatalf("error: finding todofile via nb: %s", e.Stderr)
// }
// todofile = strings.TrimSpace(string(nb_output))
}
log.Printf("watching %q", todofile)
w, err := fsnotify.NewWatcher()
if err != nil {
log.Fatalf("error: creating watcher: %v", err)
}
defer w.Close()
if err := w.Add(todofile); err != nil {
log.Fatalf("error: adding watch: %v", err)
}
if err := update(); err != nil {
// fail here because it's the first time we
// try to read the todofile.
log.Fatalf("error: %v", err)
}
for {
select {
case evt, ok := <-w.Events:
if !ok {
return
}
// see https://github.com/fsnotify/fsnotify/issues/94
// https://github.com/gohugoio/hugo/pull/4720
if evt.Op&fsnotify.Remove == fsnotify.Remove {
counter := 0
for w.Add(todofile) != nil {
counter++
if counter >= 1000 {
log.Panic("error: unable to add file watcher")
}
time.Sleep(100 * time.Millisecond)
}
}
goto force_update
case err, ok := <-w.Errors:
if !ok {
return
}
log.Printf("error: from watcher: %v", err)
case sig := <-updateC:
switch sig {
case unix.SIGUSR1: // on
active = !active
if err := setCookie(active); err != nil {
log.Printf("err: %v", err)
}
goto force_update
case unix.SIGUSR2: //
if strings.Contains(labelFilter, "work") {
labelFilter = strings.Trim(strings.ReplaceAll(labelFilter, "work", ""), ",")
} else {
labelFilter = strings.Join([]string{labelFilter, "work"}, ",")
}
continue
case unix.SIGHUP: // force update
log.Println("force update")
goto force_update
}
case <-cancelC:
log.Printf("%s exiting", os.Args[0])
os.Exit(0)
}
force_update:
_ = update()
}
}
|
