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// Copyright 2017 Marc-Antoine Ruel. All rights reserved.
// Use of this source code is governed under the Apache License, Version 2.0
// that can be found in the LICENSE file.
//go:build tools
// +build tools
package main
import (
"bytes"
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"regexp"
"strconv"
"text/template"
)
const content = `// Code generated by regen.go. DO NOT EDIT.
package stack
import (
"html/template"
)
const indexHTML = {{.IndexHTML}}
// favicon is the bomb emoji U+1F4A3 in Noto Emoji as a 128x128 base64 encoded
// PNG.
//
// See README.md for license and how to retrieve it.
const favicon template.HTML = "{{.Favicon}}"
`
// loadGoroutines returns "goroutines.tpl" slightly processed for density.
func loadGoroutines() ([]byte, error) {
htmlRaw, err := ioutil.ReadFile("goroutines.tpl")
if err != nil {
return nil, err
}
// Strip out leading whitespace.
re := regexp.MustCompile("(\\n[ \\t]*)+")
htmlRaw = re.ReplaceAll(htmlRaw, []byte("\n"))
return htmlRaw, nil
}
func mainImpl() error {
htmlRaw, err := loadGoroutines()
if err != nil {
return err
}
// See README.md how to generate it.
iconRaw, err := ioutil.ReadFile("emoji_u1f4a3_64.gif")
if err != nil {
return err
}
t, err := template.New("t").Parse(content)
if err != nil {
return err
}
data := map[string]string{
"IndexHTML": strconv.Quote(string(htmlRaw)),
"Favicon": base64.StdEncoding.EncodeToString(iconRaw),
}
b := bytes.Buffer{}
if err := t.Execute(&b, data); err != nil {
return err
}
return ioutil.WriteFile("data.go", b.Bytes(), 0666)
}
func main() {
if err := mainImpl(); err != nil {
fmt.Fprintf(os.Stderr, "Failed: %s\n", err)
os.Exit(1)
}
}
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