1 // acmetag is a tool to programmatically interact with acme(1) tag
2 // bar.  It provides two flag:
3 //
4 // 	* -g prints the tag content (mnemonic: get)
5 // 	* -c clears the tag content (mnemonic: clear)
6 //
7 // Any other argument (if passed) will be appended to the tag bar.
8 //
9 // Of course, you can combine the flags:
10 //
11 // 	acmetag -g -c fmt
12 package main
13 
14 // BUG(op) it cannot change the text before the | character.
15 
16 import (
17 	"flag"
18 	"fmt"
19 	"log"
20 	"os"
21 	"strconv"
22 
23 	"9fans.net/go/acme"
24 )
25 
26 var (
27 	cl = flag.Bool("c", false, `Clear the tag`)
28 	gt = flag.Bool("g", false, `Get the content of the tag`)
29 )
30 
31 func open() (*acme.Win, error) {
32 	winid := os.Getenv("winid")
33 	id, err := strconv.Atoi(winid)
34 	if err != nil {
35 		return nil, err
36 	}
37 	win, err := acme.Open(id, nil)
38 	return win, err
39 }
40 
41 func usage() {
42 	me := os.Args[0]
43 	fmt.Println(me, "- manage acme(1) tag")
44 	fmt.Println("Usage:", me, " [-cg] [entries...]")
45 	fmt.Println(" where entries are words to be added to the acme tag bar")
46 	flag.PrintDefaults()
47 	os.Exit(1)
48 }
49 
50 func main() {
51 	flag.Usage = usage
52 	flag.Parse()
53 
54 	win, err := open()
55 	if err != nil {
56 		os.Exit(1)
57 	}
58 	defer win.CloseFiles()
59 
60 	if *gt {
61 		tag, err := win.ReadAll("tag")
62 		if err != nil {
63 			log.Fatalln(err)
64 		}
65 		fmt.Println(string(tag))
66 	}
67 
68 	if *cl {
69 		win.Ctl("cleartag")
70 	}
71 
72 	sep := ""
73 	for _, arg := range flag.Args() {
74 		_, err = win.Write("tag", []byte(sep+arg))
75 		sep = " "
76 	}
77 }