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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/.
//go:build ignore
// +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
import (
"time"
"github.com/syncthing/syncthing/lib/assets"
)
func Assets() map[string]assets.Asset {
var ret = make(map[string]assets.Asset, {{.Assets | len}})
t := time.Unix({{.Generated}}, 0)
{{range $asset := .Assets}}
ret["{{$asset.Name}}"] = assets.Asset{
Content: {{$asset.Data}},
Gzipped: {{$asset.Gzipped}},
Length: {{$asset.Length}},
Filename: {{$asset.Name | printf "%q"}},
Modified: t,
}
{{end}}
return ret
}
`))
type asset struct {
Name string
Data string
Length int
Gzipped bool
}
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() {
data, err := os.ReadFile(name)
if err != nil {
return err
}
length := len(data)
var buf bytes.Buffer
gw, _ := gzip.NewWriterLevel(&buf, gzip.BestCompression)
gw.Write(data)
gw.Close()
// Only replace asset by gzipped version if it is smaller.
// In practice, this means HTML, CSS, SVG etc. get compressed,
// while PNG and WOFF files are left uncompressed.
// lib/assets detects gzip and sets headers/decompresses.
gzipped := buf.Len() < len(data)
if gzipped {
data = buf.Bytes()
}
name, _ = filepath.Rel(basePath, name)
assets = append(assets, asset{
Name: filepath.ToSlash(name),
Data: fmt.Sprintf("%q", string(data)),
Length: length,
Gzipped: gzipped,
})
}
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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