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build.go
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build.go
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package main
import (
"bytes"
"crypto/sha1"
"encoding/hex"
"html/template"
"io"
"io/fs"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"golang.org/x/net/html"
)
func build() error {
log.Println("building")
_ = os.RemoveAll(filepath.Join(".", "build"))
err := os.MkdirAll(filepath.Join(".", "build", "pygments-cache"), 0755)
if err != nil {
return err
}
// copy assets
assetRoot := filepath.Join(".", "assets")
err = filepath.Walk(assetRoot, func(p string, fi fs.FileInfo, err error) error {
if err != nil {
return err
}
if fi.IsDir() {
return nil
}
dstPath := filepath.Join(".", "build", "assets", p[len(assetRoot):])
err = os.MkdirAll(filepath.Dir(dstPath), 0755)
if err != nil {
return err
}
dst, err := os.Create(dstPath)
if err != nil {
return err
}
defer dst.Close()
src, err := os.Open(p)
if err != nil {
return err
}
defer src.Close()
_, err = io.Copy(dst, src)
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
// compile pages
tplRoot := filepath.Join(".", "tpl")
err = filepath.Walk(tplRoot, func(p string, fi fs.FileInfo, err error) error {
if err != nil {
return err
}
if fi.IsDir() {
return nil
}
if filepath.Ext(p) != ".gohtml" {
return nil
}
nm := p[len(tplRoot):]
nm = nm[:len(nm)-len(filepath.Ext(nm))]
if strings.HasPrefix(nm, string(filepath.Separator)) {
nm = nm[1:]
}
dstPath := filepath.Join(".", "build", nm+".html")
err = os.MkdirAll(filepath.Dir(dstPath), 0755)
if err != nil {
return err
}
dst, err := os.Create(dstPath)
if err != nil {
return err
}
defer dst.Close()
contents, err := compileTemplate(nm, map[string]string{
"StackVersion": StackVersion,
})
if err != nil {
return err
}
_, err = io.WriteString(dst, contents)
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
return nil
}
func hash(data []byte) string {
h := sha1.New()
h.Write(data)
return hex.EncodeToString(h.Sum(nil))
}
func compileCodeBlock(lexer string, src string) (string, error) {
nm := filepath.Join(".", "build", "pygments-cache", hash([]byte(lexer+"|"+src)))
f, err := os.Open(nm)
if err == nil {
bs, err := ioutil.ReadAll(f)
f.Close()
if err == nil {
return string(bs), nil
}
}
src = strings.TrimSpace(src)
var codeResult bytes.Buffer
cmd := exec.Command("pygmentize", "-f", "html", "-l", lexer)
cmd.Stdin = strings.NewReader(src)
cmd.Stdout = &codeResult
err = cmd.Run()
if err != nil {
return "", err
}
err = os.WriteFile(nm, codeResult.Bytes(), 0777)
if err != nil {
return "", err
}
return codeResult.String(), nil
}
func compileTemplate(name string, data interface{}) (string, error) {
files := []string{}
err := filepath.Walk("tpl", func(p string, fi os.FileInfo, err error) error {
if strings.HasSuffix(p, ".gohtml") {
files = append(files, p)
}
return err
})
if err != nil {
return "", err
}
tpl, err := template.New("template").Funcs(template.FuncMap{
"asset_url": assetURL,
}).ParseFiles(files...)
if err != nil {
return "", err
}
var buf bytes.Buffer
err = tpl.ExecuteTemplate(&buf, name, data)
if err != nil {
return "", err
}
body := buf.String()
buf.Reset()
err = tpl.ExecuteTemplate(&buf, "layout", map[string]interface{}{
"Body": template.HTML(body),
})
if err != nil {
return "", err
}
var out bytes.Buffer
inCode := false
codeLang := "text"
codeText := ""
z := html.NewTokenizer(&buf)
loop:
for {
tt := z.Next()
switch tt {
case html.ErrorToken:
break loop
case html.TextToken:
if inCode {
codeText += string(z.Text())
} else {
out.Write(z.Text())
}
case html.StartTagToken:
tag, hasAttr := z.TagName()
attrs := make(map[string]string)
for hasAttr {
var key, val []byte
key, val, hasAttr = z.TagAttr()
attrs[string(key)] = string(val)
}
if bytes.Equal(tag, []byte("code")) && attrs["data-lexer"] != "" {
inCode = true
codeLang = attrs["data-lexer"]
codeText = ""
} else {
out.WriteString("<")
out.Write(tag)
for k, v := range attrs {
out.WriteString(" ")
out.WriteString(k)
out.WriteString("=\"")
out.WriteString(strings.Replace(v, "\"", """, -1))
out.WriteString("\"")
}
out.WriteString(">")
}
case html.EndTagToken:
if inCode {
code, err := compileCodeBlock(codeLang, codeText)
if err != nil {
return "", err
}
out.WriteString(code)
inCode = false
} else {
out.WriteString(z.Token().String())
}
case html.SelfClosingTagToken:
out.WriteString(z.Token().String())
case html.CommentToken:
case html.DoctypeToken:
out.WriteString(z.Token().String())
}
}
return out.String(), nil
}