package main import ( "bytes" "fmt" "io" "io/ioutil" "log" "os" "os/exec" "path" "path/filepath" "strings" "time" "github.com/russross/blackfriday" ) const ( ZSDIR = ".zs" PUBDIR = ".pub" ) type EvalFn func(args []string, vars map[string]string) (string, error) func split2(s, delim string) (string, string) { parts := strings.SplitN(s, delim, 2) if len(parts) == 2 { return parts[0], parts[1] } else { return parts[0], "" } } func md(path, s string) (map[string]string, string) { url := path[:len(path)-len(filepath.Ext(path))] + ".html" v := map[string]string{ "file": path, "url": url, "output": filepath.Join(PUBDIR, url), "layout": "index.html", } if strings.Index(s, "\n\n") == -1 { return map[string]string{}, s } header, body := split2(s, "\n\n") for _, line := range strings.Split(header, "\n") { key, value := split2(line, ":") v[strings.ToLower(strings.TrimSpace(key))] = strings.TrimSpace(value) } if strings.HasPrefix(v["url"], "./") { v["url"] = v["url"][2:] } return v, body } func render(s string, vars map[string]string, eval EvalFn) (string, error) { delim_open := "{{" delim_close := "}}" out := bytes.NewBuffer(nil) for { if from := strings.Index(s, delim_open); from == -1 { out.WriteString(s) return out.String(), nil } else { if to := strings.Index(s, delim_close); to == -1 { return "", fmt.Errorf("Close delim not found") } else { out.WriteString(s[:from]) cmd := s[from+len(delim_open) : to] s = s[to+len(delim_close):] m := strings.Fields(cmd) if len(m) == 1 { if v, ok := vars[m[0]]; ok { out.WriteString(v) continue } } if res, err := eval(m, vars); err == nil { out.WriteString(res) } else { log.Println(err) // silent } } } } } func env(vars map[string]string) []string { env := []string{"ZS=" + os.Args[0], "ZS_OUTDIR=" + PUBDIR} env = append(env, os.Environ()...) if vars != nil { for k, v := range vars { env = append(env, "ZS_"+strings.ToUpper(k)+"="+v) } } return env } func run(cmd string, args []string, vars map[string]string, output io.Writer) error { var errbuf bytes.Buffer c := exec.Command(cmd, args...) c.Env = env(vars) c.Stdout = output c.Stderr = &errbuf err := c.Run() if errbuf.Len() > 0 { log.Println(errbuf.String()) } if err != nil { return err } return nil } func eval(cmd []string, vars map[string]string) (string, error) { outbuf := bytes.NewBuffer(nil) err := run(path.Join(ZSDIR, cmd[0]), cmd[1:], vars, outbuf) if err != nil { if _, ok := err.(*exec.ExitError); ok { return "", err } outbuf = bytes.NewBuffer(nil) err := run(cmd[0], cmd[1:], vars, outbuf) // Return exit errors, but ignore if the command was not found if _, ok := err.(*exec.ExitError); ok { return "", err } } return outbuf.String(), nil } func buildMarkdown(path string) error { b, err := ioutil.ReadFile(path) if err != nil { return err } v, body := md(path, string(b)) content, err := render(body, v, eval) if err != nil { return err } v["content"] = string(blackfriday.MarkdownBasic([]byte(content))) return buildPlain(filepath.Join(ZSDIR, v["layout"]), v) } func buildPlain(path string, vars map[string]string) error { b, err := ioutil.ReadFile(path) if err != nil { return err } content, err := render(string(b), vars, eval) if err != nil { return err } output := filepath.Join(PUBDIR, path) if s, ok := vars["output"]; ok { output = s } err = ioutil.WriteFile(output, []byte(content), 0666) if err != nil { return err } return nil } func copyFile(path string) (err error) { var in, out *os.File if in, err = os.Open(path); err == nil { defer in.Close() if out, err = os.Create(filepath.Join(PUBDIR, path)); err == nil { defer out.Close() _, err = io.Copy(out, in) } } return err } func buildAll(once bool) { lastModified := time.Unix(0, 0) modified := false for { os.Mkdir(PUBDIR, 0755) err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error { // ignore hidden files and directories if filepath.Base(path)[0] == '.' || strings.HasPrefix(path, ".") { return nil } if info.IsDir() { os.Mkdir(filepath.Join(PUBDIR, path), 0755) return nil } else if info.ModTime().After(lastModified) { if !modified { // About to be modified, so run pre-build hook run(filepath.Join(ZSDIR, "pre"), []string{}, nil, nil) modified = true } ext := filepath.Ext(path) if ext == ".md" || ext == ".mkd" { log.Println("mkd: ", path) return buildMarkdown(path) } else if ext == ".html" || ext == ".xml" { return buildPlain(path, map[string]string{}) } else { log.Println("raw: ", path) return copyFile(path) } } return nil }) if err != nil { log.Println("ERROR:", err) } if modified { // Something was modified, so post-build hook run(filepath.Join(ZSDIR, "post"), []string{}, nil, nil) modified = false } lastModified = time.Now() if once { break } time.Sleep(1 * time.Second) } } func main() { if len(os.Args) == 1 { fmt.Println(os.Args[0], " [args]") return } cmd := os.Args[1] args := os.Args[2:] switch cmd { case "build": buildAll(true) case "watch": buildAll(false) // pass duration case "var": if len(args) == 0 { log.Println("ERROR: filename expected") return } if b, err := ioutil.ReadFile(args[0]); err == nil { vars, _ := md(args[0], string(b)) if len(args) > 1 { for _, a := range args[1:] { fmt.Println(vars[a]) } } else { for k, v := range vars { fmt.Println(k + ":" + v) } } } else { log.Println(err) } default: err := run(path.Join(ZSDIR, cmd), args, map[string]string{}, os.Stdout) if err != nil { log.Println(err) } } }