misc/sortac: add tool to sort the AUTHORS and CONTRIBUTORS files

I keep losing this utility, used as part of other tools to auto-update
the AUTHORS and CONTRIBUTORS files.  Check it in to the repo so I
don't lose it, and so others can use it as well.

Updates #12042

Change-Id: Ib5886b85799087aaaddcec4c81169e2726322c05
Reviewed-on: https://go-review.googlesource.com/16824
Reviewed-by: Russ Cox <rsc@golang.org>

diff --git a/misc/sortac/sortac.go b/misc/sortac/sortac.go
new file mode 100644 (file)
index 0000000..f61aa96
--- /dev/null
+++ b/misc/sortac/sortac.go
@@ -0,0 +1,79 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Sortac sorts the AUTHORS and CONTRIBUTORS files.
+//
+// Usage:
+//
+//    sortac [file...]
+//
+// Sortac sorts the named files in place.
+// If given no arguments, it sorts standard input to standard output.
+package main
+
+import (
+       "bufio"
+       "bytes"
+       "flag"
+       "fmt"
+       "io"
+       "io/ioutil"
+       "log"
+       "os"
+
+       "golang.org/x/text/collate"
+       "golang.org/x/text/language"
+)
+
+func main() {
+       log.SetFlags(0)
+       log.SetPrefix("sortac: ")
+       flag.Parse()
+
+       args := flag.Args()
+       if len(args) == 0 {
+               os.Stdout.Write(sortAC(os.Stdin))
+       } else {
+               for _, arg := range args {
+                       f, err := os.Open(arg)
+                       if err != nil {
+                               log.Fatal(err)
+                       }
+                       sorted := sortAC(f)
+                       f.Close()
+                       if err := ioutil.WriteFile(arg, sorted, 0644); err != nil {
+                               log.Fatal(err)
+                       }
+               }
+       }
+}
+
+func sortAC(r io.Reader) []byte {
+       bs := bufio.NewScanner(r)
+       var header []string
+       var lines []string
+       for bs.Scan() {
+               t := bs.Text()
+               lines = append(lines, t)
+               if t == "# Please keep the list sorted." {
+                       header = lines
+                       lines = nil
+                       continue
+               }
+       }
+       if err := bs.Err(); err != nil {
+               log.Fatal(err)
+       }
+
+       var out bytes.Buffer
+       c := collate.New(language.Und, collate.Loose)
+       c.SortStrings(lines)
+       for _, l := range header {
+               fmt.Fprintln(&out, l)
+       }
+       for _, l := range lines {
+               fmt.Fprintln(&out, l)
+       }
+       return out.Bytes()
+}