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https://github.com/golang/go
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562e4faeca
Add godoc/vfs/mapfs package for serving baked files. Fixes golang/go#6010. R=golang-dev, bradfitz, r, arnehormann, rsc CC=golang-dev https://golang.org/cl/12978043
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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// Command bake takes a list of file names and writes a Go source file to
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// standard output that declares a map of string constants containing the input files.
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//
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// For example, the command
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// bake foo.html bar.txt
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// produces a source file in package main that declares the variable bakedFiles
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// that is a map with keys "foo.html" and "bar.txt" that contain the contents
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// of foo.html and bar.txt.
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package main
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import (
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"bufio"
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"unicode/utf8"
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)
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func main() {
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if err := bake(os.Args[1:]); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func bake(files []string) error {
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w := bufio.NewWriter(os.Stdout)
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fmt.Fprintf(w, "%v\n\npackage main\n\n", warning)
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fmt.Fprintf(w, "var bakedFiles = map[string]string{\n")
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for _, fn := range files {
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b, err := ioutil.ReadFile(fn)
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if err != nil {
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return err
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}
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if !utf8.Valid(b) {
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return fmt.Errorf("file %s is not valid UTF-8", fn)
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}
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fmt.Fprintf(w, "\t%q: `%s`,\n", filepath.Base(fn), sanitize(b))
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}
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fmt.Fprintln(w, "}")
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return w.Flush()
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}
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// sanitize prepares a string as a raw string constant.
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func sanitize(b []byte) []byte {
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// Replace ` with `+"`"+`
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b = bytes.Replace(b, []byte("`"), []byte("`+\"`\"+`"), -1)
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// Replace BOM with `+"\xEF\xBB\xBF"+`
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// (A BOM is valid UTF-8 but not permitted in Go source files.
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// I wouldn't bother handling this, but for some insane reason
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// jquery.js has a BOM somewhere in the middle.)
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return bytes.Replace(b, []byte("\xEF\xBB\xBF"), []byte("`+\"\\xEF\\xBB\\xBF\"+`"), -1)
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}
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const warning = "// DO NOT EDIT ** This file was generated with the bake tool ** DO NOT EDIT //"
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