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// Copyright (C) 2014 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 https://mozilla.org/MPL/2.0/.
// +build ignore
package main
import (
"bytes"
"compress/gzip"
"flag"
"fmt"
"go/format"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"text/template"
"time"
)
var tpl = template.Must(template.New("assets").Parse(`// Code generated by genassets.go - DO NOT EDIT.
package auto
const Generated int64 = {{.Generated}}
func Assets() map[string][]byte {
var assets = make(map[string][]byte, {{.Assets | len}})
{{range $asset := .Assets}}
assets["{{$asset.Name}}"] = {{$asset.Data}}{{end}}
return assets
}
`))
type asset struct {
Name string
Data string
}
var assets []asset
func walkerFor(basePath string) filepath.WalkFunc {
return func(name string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if strings.HasPrefix(filepath.Base(name), ".") {
// Skip dotfiles
return nil
}
if info.Mode().IsRegular() {
fd, err := os.Open(name)
if err != nil {
return err
}
var buf bytes.Buffer
gw := gzip.NewWriter(&buf)
io.Copy(gw, fd)
fd.Close()
gw.Flush()
gw.Close()
name, _ = filepath.Rel(basePath, name)
assets = append(assets, asset{
Name: filepath.ToSlash(name),
Data: fmt.Sprintf("[]byte(%q)", buf.String()),
})
}
return nil
}
}
type templateVars struct {
Assets []asset
Generated int64
}
func main() {
outfile := flag.String("o", "", "Name of output file (default stdout)")
flag.Parse()
filepath.Walk(flag.Arg(0), walkerFor(flag.Arg(0)))
var buf bytes.Buffer
// Generated time is now, except if the SOURCE_DATE_EPOCH environment
// variable is set (for reproducible builds).
generated := time.Now().Unix()
if s, _ := strconv.ParseInt(os.Getenv("SOURCE_DATE_EPOCH"), 10, 64); s > 0 {
generated = s
}
tpl.Execute(&buf, templateVars{
Assets: assets,
Generated: generated,
})
bs, err := format.Source(buf.Bytes())
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
out := io.Writer(os.Stdout)
if *outfile != "" {
out, err = os.Create(*outfile)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
out.Write(bs)
}
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