miniflux/generate.go

// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

// +build ignore

package main

import (
	"crypto/sha256"
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"os"
	"path"
	"path/filepath"
	"strings"
	"text/template"

	"github.com/tdewolff/minify"
	"github.com/tdewolff/minify/css"
	"github.com/tdewolff/minify/js"
)

const tpl = `// Code generated by go generate; DO NOT EDIT.

package {{ .Package }}

var {{ .Map }} = map[string]string{
{{ range $constant, $content := .Files }}` + "\t" + `"{{ $constant }}": ` + "`{{ $content }}`" + `,
{{ end }}}

var {{ .Map }}Checksums = map[string]string{
{{ range $constant, $content := .Checksums }}` + "\t" + `"{{ $constant }}": "{{ $content }}",
{{ end }}}
`

var bundleTpl = template.Must(template.New("").Parse(tpl))

type Bundle struct {
	Package, Map string
	Files        map[string]string
	Checksums    map[string]string
}

func (b *Bundle) Write(filename string) {
	f, err := os.Create(filename)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	bundleTpl.Execute(f, b)
}

func NewBundle(pkg, mapName string) *Bundle {
	return &Bundle{
		Package:   pkg,
		Map:       mapName,
		Files:     make(map[string]string),
		Checksums: make(map[string]string),
	}
}

func readFile(filename string) []byte {
	data, err := ioutil.ReadFile(filename)
	if err != nil {
		panic(err)
	}
	return data
}

func checksum(data []byte) string {
	return fmt.Sprintf("%x", sha256.Sum256(data))
}

func basename(filename string) string {
	return path.Base(filename)
}

func stripExtension(filename string) string {
	filename = strings.TrimSuffix(filename, filepath.Ext(filename))
	return strings.Replace(filename, " ", "_", -1)
}

func glob(pattern string) []string {
	files, _ := filepath.Glob(pattern)
	return files
}

func concat(files []string) string {
	var b strings.Builder
	for _, file := range files {
		b.Write(readFile(file))
	}
	return b.String()
}

func generateJSBundle(bundleFile string, srcFiles []string) {
	var b strings.Builder
	b.WriteString("(function() {'use strict';")
	b.WriteString(concat(srcFiles))
	b.WriteString("})();")

	m := minify.New()
	m.AddFunc("text/javascript", js.Minify)

	output, err := m.String("text/javascript", b.String())
	if err != nil {
		panic(err)
	}

	bundle := NewBundle("static", "Javascript")
	bundle.Files["app"] = output
	bundle.Checksums["app"] = checksum([]byte(output))
	bundle.Write(bundleFile)
}

func generateCSSBundle(bundleFile string, themes map[string][]string) {
	bundle := NewBundle("static", "Stylesheets")
	m := minify.New()
	m.AddFunc("text/css", css.Minify)

	for theme, srcFiles := range themes {
		data := concat(srcFiles)
		minifiedData, err := m.String("text/css", data)
		if err != nil {
			panic(err)
		}

		bundle.Files[theme] = minifiedData
		bundle.Checksums[theme] = checksum([]byte(minifiedData))
	}

	bundle.Write(bundleFile)
}

func generateBinaryBundle(bundleFile string, srcFiles []string) {
	bundle := NewBundle("static", "Binaries")

	for _, srcFile := range srcFiles {
		data := readFile(srcFile)
		filename := basename(srcFile)
		encodedData := base64.StdEncoding.EncodeToString(data)

		bundle.Files[filename] = string(encodedData)
		bundle.Checksums[filename] = checksum(data)
	}

	bundle.Write(bundleFile)
}

func generateBundle(bundleFile, pkg, mapName string, srcFiles []string) {
	bundle := NewBundle(pkg, mapName)

	for _, srcFile := range srcFiles {
		data := readFile(srcFile)
		filename := stripExtension(basename(srcFile))

		bundle.Files[filename] = string(data)
		bundle.Checksums[filename] = checksum(data)
	}

	bundle.Write(bundleFile)
}

func main() {
	generateJSBundle("ui/static/js.go", []string{
		"ui/static/js/dom_helper.js",
		"ui/static/js/touch_handler.js",
		"ui/static/js/keyboard_handler.js",
		"ui/static/js/mouse_handler.js",
		"ui/static/js/form_handler.js",
		"ui/static/js/request_builder.js",
		"ui/static/js/unread_counter_handler.js",
		"ui/static/js/entry_handler.js",
		"ui/static/js/confirm_handler.js",
		"ui/static/js/menu_handler.js",
		"ui/static/js/modal_handler.js",
		"ui/static/js/nav_handler.js",
		"ui/static/js/bootstrap.js",
	})

	generateCSSBundle("ui/static/css.go", map[string][]string{
		"default":   []string{"ui/static/css/common.css"},
		"black":     []string{"ui/static/css/common.css", "ui/static/css/black.css"},
		"sansserif": []string{"ui/static/css/common.css", "ui/static/css/sansserif.css"},
	})

	generateBinaryBundle("ui/static/bin.go", glob("ui/static/bin/*"))

	generateBundle("sql/sql.go", "sql", "SqlMap", glob("sql/*.sql"))
	generateBundle("template/views.go", "template", "templateViewsMap", glob("template/html/*.html"))
	generateBundle("template/common.go", "template", "templateCommonMap", glob("template/html/common/*.html"))
	generateBundle("locale/translations.go", "locale", "translations", glob("locale/translations/*.json"))
}