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// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
// +build ignore
package main
import (
"bufio"
"flag"
"fmt"
"io"
"log"
"os"
"regexp"
"strings"
"text/tabwriter"
)
func main() {
flag.Parse()
file := flag.Arg(0)
in, err := os.Open(file)
if err != nil {
log.Fatal(err)
}
out, err := os.Create(file + ".tmp")
if err != nil {
log.Fatal(err)
}
if err := formatProto(in, out); err != nil {
log.Fatal(err)
}
in.Close()
out.Close()
if err := os.Rename(file+".tmp", file); err != nil {
log.Fatal(err)
}
}
func formatProto(in io.Reader, out io.Writer) error {
sc := bufio.NewScanner(in)
lineExp := regexp.MustCompile(`([^=]+)\s+([^=\s]+?)\s*=(.+)`)
var tw *tabwriter.Writer
for sc.Scan() {
line := sc.Text()
if strings.HasPrefix(line, "//") {
if _, err := fmt.Fprintln(out, line); err != nil {
return err
}
continue
}
ms := lineExp.FindStringSubmatch(line)
for i := range ms {
ms[i] = strings.TrimSpace(ms[i])
}
if len(ms) == 4 && ms[1] != "option" {
typ := strings.Join(strings.Fields(ms[1]), " ")
name := ms[2]
id := ms[3]
if tw == nil {
tw = tabwriter.NewWriter(out, 4, 4, 1, ' ', 0)
}
if typ == "" {
// We're in an enum
fmt.Fprintf(tw, "\t%s\t= %s\n", name, id)
} else {
// Message
fmt.Fprintf(tw, "\t%s\t%s\t= %s\n", typ, name, id)
}
} else {
if tw != nil {
if err := tw.Flush(); err != nil {
return err
}
tw = nil
}
if _, err := fmt.Fprintln(out, line); err != nil {
return err
}
}
}
return nil
}
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