syncthing/cmd/genassets/main.go

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// Copyright (C) 2014 The Syncthing Authors.
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//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
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// +build ignore
package main
import (
"bytes"
"compress/gzip"
"encoding/base64"
"flag"
"go/format"
"io"
"os"
"path/filepath"
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"strings"
"text/template"
)
var tpl = template.Must(template.New("assets").Parse(`package auto
import (
"bytes"
"compress/gzip"
"encoding/base64"
"io/ioutil"
)
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func Assets() map[string][]byte {
var assets = make(map[string][]byte, {{.assets | len}})
var bs []byte
var gr *gzip.Reader
{{range $asset := .assets}}
bs, _ = base64.StdEncoding.DecodeString("{{$asset.Data}}")
gr, _ = gzip.NewReader(bytes.NewBuffer(bs))
bs, _ = ioutil.ReadAll(gr)
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assets["{{$asset.Name}}"] = bs
{{end}}
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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
}
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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: base64.StdEncoding.EncodeToString(buf.Bytes()),
})
}
return nil
}
}
func main() {
flag.Parse()
filepath.Walk(flag.Arg(0), walkerFor(flag.Arg(0)))
var buf bytes.Buffer
tpl.Execute(&buf, map[string][]asset{"assets": assets})
bs, err := format.Source(buf.Bytes())
if err != nil {
panic(err)
}
os.Stdout.Write(bs)
}