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(s string) (map[string]string, string) { v := map[string]string{} 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) } return v, body } func render(s string, vars map[string]string, eval EvalFn) (string, error) { b := []byte(s) delim_open := []byte("{{") delim_close := []byte("}}") out := bytes.NewBuffer(nil) for { if from := bytes.Index(b, delim_open); from == -1 { out.Write(b) return out.String(), nil } else { to := bytes.Index(b, delim_close) if to == -1 { return "", fmt.Errorf("Close delim not found") } else { out.Write(b[:from]) cmd := b[from+len(delim_open) : to] b = b[to+len(delim_close):] m := strings.Fields(string(cmd)) if len(m) == 1 { if v, ok := vars[m[0]]; ok { out.Write([]byte(v)) continue } } if res, err := eval(m, vars); err == nil { out.Write([]byte(res)) } else { log.Println(err) // silent } } } } } func eval(cmd []string, vars map[string]string) (string, error) { var outbuf, errbuf bytes.Buffer c := exec.Command(path.Join(ZSDIR, cmd[0]), cmd[1:]...) env := []string{"ZS=" + os.Args[0]} for k, v := range vars { env = append(env, "ZS_"+strings.ToUpper(k)+"="+v) } c.Env = append(c.Env, env...) c.Stdout = &outbuf c.Stderr = &errbuf if err := c.Run(); err != nil { log.Println(err) c := exec.Command(path.Join(cmd[0]), cmd[1:]...) c.Env = append(c.Env, env...) c.Stdout = &outbuf c.Stderr = &errbuf if err := c.Run(); err != nil { return "", err } } if errbuf.Len() > 0 { log.Println(errbuf.String()) } return outbuf.String(), nil } func buildMarkdown(path string) error { b, err := ioutil.ReadFile(path) if err != nil { return err } v, body := md(string(b)) defaultVars(v, path) content, err := render(body, v, eval) if err != nil { return err } v["content"] = string(blackfriday.MarkdownBasic([]byte(content))) b, err = ioutil.ReadFile(filepath.Join(ZSDIR, v["layout"])) if err != nil { return err } content, err = render(string(b), v, eval) if err != nil { return err } err = ioutil.WriteFile(v["output"], []byte(content), 0666) if err != nil { return err } return nil } func defaultVars(vars map[string]string, path string) { if _, ok := vars["file"]; !ok { vars["file"] = path } if _, ok := vars["url"]; !ok { vars["url"] = path[:len(path)-len(filepath.Ext(path))] + ".html" if strings.HasPrefix(vars["url"], "./") { vars["url"] = vars["url"][2:] } } if _, ok := vars["outdir"]; !ok { vars["outdir"] = PUBDIR } if _, ok := vars["output"]; !ok { vars["output"] = filepath.Join(PUBDIR, vars["url"]) } if _, ok := vars["layout"]; !ok { vars["layout"] = "index.html" } } func copyFile(path string) error { if in, err := os.Open(path); err != nil { return err } else { defer in.Close() if stat, err := in.Stat(); err != nil { return err } else { // Directory? if stat.Mode().IsDir() { os.Mkdir(filepath.Join(PUBDIR, path), 0755) return nil } if !stat.Mode().IsRegular() { return nil } } if out, err := os.Create(filepath.Join(PUBDIR, path)); err != nil { return err } else { defer out.Close() _, err = io.Copy(out, in) return err } } } func buildAll(once bool) { lastModified := time.Unix(0, 0) 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.ModTime().After(lastModified) { ext := filepath.Ext(path) if ext == ".md" || ext == "mkd" { log.Println("mkd: ", path) return buildMarkdown(path) } else { log.Println("raw: ", path) return copyFile(path) } } return nil }) if err != nil { log.Println("ERROR:", err) } 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(string(b)) defaultVars(vars, args[0]) 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: cmd := exec.Command(path.Join(ZSDIR, cmd), args...) cmd.Env = append(cmd.Env, "ZS="+os.Args[0]) cmd.Stdout = os.Stdout cmd.Stderr = os.Stderr if err := cmd.Run(); err != nil { log.Println(err) } } }