package main import ( "bytes" "fmt" "io" "io/ioutil" "log" "os" "os/exec" "path" "path/filepath" "strings" "text/template" "time" "github.com/russross/blackfriday" "github.com/yosssi/gcss" "github.com/zserge/amber" ) const ( ZSDIR = ".zs" PUBDIR = ".pub" ) type Vars map[string]string // Splits a string in exactly two parts by delimiter // If no delimiter is found - the second string is be empty 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], "" } } // Parses markdown content. Returns parsed header variables and content func md(path string, globals Vars) (Vars, string, error) { b, err := ioutil.ReadFile(path) if err != nil { return nil, "", err } s := string(b) url := path[:len(path)-len(filepath.Ext(path))] + ".html" v := Vars{ "file": path, "url": url, "output": filepath.Join(PUBDIR, url), } if _, err := os.Stat(filepath.Join(ZSDIR, "layout.amber")); err == nil { v["layout"] = "layout.amber" } else { v["layout"] = "layout.html" } if info, err := os.Stat(path); err == nil { v["date"] = info.ModTime().Format("02-01-2006") } for name, value := range globals { v[name] = value } if strings.Index(s, "\n\n") == -1 { return v, s, nil } 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, nil } // Use standard Go templates func render(s string, funcs template.FuncMap, vars Vars) (string, error) { f := template.FuncMap{} for k, v := range funcs { f[k] = v } for k, v := range vars { f[k] = varFunc(v) } tmpl, err := template.New("").Funcs(f).Parse(s) if err != nil { return "", err } out := &bytes.Buffer{} if err := tmpl.Execute(out, vars); err != nil { return "", err } return string(out.Bytes()), nil } // Converts zs markdown variables into environment variables func env(vars Vars) []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 } // Runs command with given arguments and variables, intercepts stderr and // redirects stdout into the given writer func run(cmd string, args []string, vars Vars, 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("ERROR:", errbuf.String()) } if err != nil { return err } return nil } // Expands macro: either replacing it with the variable value, or // running the plugin command and replacing it with the command's output func eval(cmd []string, vars Vars) (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 } // Renders markdown with the given layout into html expanding all the macros func buildMarkdown(path string, funcs template.FuncMap, vars Vars) error { v, body, err := md(path, vars) if err != nil { return err } content, err := render(body, funcs, v) if err != nil { return err } v["content"] = string(blackfriday.MarkdownBasic([]byte(content))) if strings.HasSuffix(v["layout"], ".amber") { return buildAmber(filepath.Join(ZSDIR, v["layout"]), renameExt(path, "", ".html"), funcs, v) } else { return buildPlain(filepath.Join(ZSDIR, v["layout"]), renameExt(path, "", ".html"), funcs, v) } } // Renders text file expanding all variable macros inside it func buildPlain(in, out string, funcs template.FuncMap, vars Vars) error { b, err := ioutil.ReadFile(in) if err != nil { return err } content, err := render(string(b), funcs, vars) if err != nil { return err } output := filepath.Join(PUBDIR, out) if s, ok := vars["output"]; ok { output = s } err = ioutil.WriteFile(output, []byte(content), 0666) if err != nil { return err } return nil } // Renders .amber file into .html func buildAmber(in, out string, funcs template.FuncMap, vars Vars) error { a := amber.New() err := a.ParseFile(in) if err != nil { return err } t, err := a.Compile() if err != nil { return err } //amber.FuncMap = amber.FuncMap f, err := os.Create(filepath.Join(PUBDIR, out)) if err != nil { return err } defer f.Close() return t.Execute(f, vars) } // Compiles .gcss into .css func buildGCSS(path string) error { f, err := os.Open(path) if err != nil { return err } s := strings.TrimSuffix(path, ".gcss") + ".css" css, err := os.Create(filepath.Join(PUBDIR, s)) if err != nil { return err } defer f.Close() defer css.Close() _, err = gcss.Compile(css, f) return err } // Copies file from working directory into public directory 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 varFunc(s string) func() string { return func() string { return s } } func pluginFunc(cmd string) func() string { return func() string { return "Not implemented yet" } } func createFuncs() template.FuncMap { // Builtin functions funcs := template.FuncMap{ "exec": func(s ...string) string { // Run external command with arguments return "" }, "zs": func(args ...string) string { // Run zs with arguments return "" }, } // Plugin functions files, _ := ioutil.ReadDir(ZSDIR) for _, f := range files { if !f.IsDir() { name := f.Name() if !strings.HasSuffix(name, ".html") && !strings.HasSuffix(name, ".amber") { funcs[strings.TrimSuffix(name, filepath.Ext(name))] = pluginFunc(name) } } } return funcs } func renameExt(path, from, to string) string { if from == "" { from = filepath.Ext(path) } return strings.TrimSuffix(path, from) + to } func globals() Vars { vars := Vars{} for _, e := range os.Environ() { pair := strings.Split(e, "=") if strings.HasPrefix(pair[0], "ZS_") { vars[strings.ToLower(pair[0][3:])] = pair[1] } } return vars } func buildAll(once bool) { lastModified := time.Unix(0, 0) modified := false vars := globals() for { os.Mkdir(PUBDIR, 0755) funcs := createFuncs() 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 // FIXME on windows it might not work well run(filepath.Join(ZSDIR, "pre"), []string{}, nil, nil) modified = true } ext := filepath.Ext(path) if ext == ".md" || ext == ".mkd" { log.Println("md: ", path) return buildMarkdown(path, funcs, vars) } else if ext == ".html" || ext == ".xml" { log.Println("html: ", path) return buildPlain(path, path, funcs, vars) } else if ext == ".amber" { log.Println("html: ", path) return buildAmber(path, renameExt(path, ".amber", ".html"), funcs, vars) } else if ext == ".gcss" { log.Println("css: ", path) return buildGCSS(path) } 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 // FIXME on windows it might not work well 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 vars, _, err := md(args[0], globals()); err == nil { 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("ERROR:", err) } default: err := run(path.Join(ZSDIR, cmd), args, Vars{}, os.Stdout) if err != nil { log.Println("ERROR:", err) } } }