commit fe8ba46281f15f3575ee39f35385234734e54ae5
Author: Serge A. Zaitsev <zaitsev.serge@gmail.com>
Date:   Fri Dec 5 18:59:56 2014 +0200

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..470733c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+zs
diff --git a/zs.go b/zs.go
new file mode 100644
index 0000000..eb241f3
--- /dev/null
+++ b/zs.go
@@ -0,0 +1,256 @@
+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"
+)
+
+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{}
+	// FIXME: if no header?
+	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
+}
+
+type EvalFn func(args []string, vars map[string]string) (string, error)
+
+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], "<command> [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 {
+			// print error
+			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 {
+			// print error
+		}
+	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)
+		}
+	}
+}
diff --git a/zs_test.go b/zs_test.go
new file mode 100644
index 0000000..0dbd68a
--- /dev/null
+++ b/zs_test.go
@@ -0,0 +1,66 @@
+package main
+
+import "testing"
+
+func TestSplit2(t *testing.T) {
+	if a, b := split2("a:b", ":"); a != "a" || b != "b" {
+		t.Fail()
+	}
+	if a, b := split2(":b", ":"); a != "" || b != "b" {
+		t.Fail()
+	}
+	if a, b := split2("a:", ":"); a != "a" || b != "" {
+		t.Fail()
+	}
+	if a, b := split2(":", ":"); a != "" || b != "" {
+		t.Fail()
+	}
+	if a, b := split2("a", ":"); a != "a" || b != "" {
+		t.Fail()
+	}
+	if a, b := split2("", ":"); a != "" || b != "" {
+		t.Fail()
+	}
+}
+
+func TestMD(t *testing.T) {
+	v, body := md(`
+	title: Hello, world!
+	keywords: foo, bar, baz
+	empty:
+	bayan: [:|||:]
+
+this: is a content`)
+	if v["title"] != "Hello, world!" {
+		t.Error()
+	}
+	if v["keywords"] != "foo, bar, baz" {
+		t.Error()
+	}
+	if s, ok := v["empty"]; !ok || len(s) != 0 {
+		t.Error()
+	}
+	if v["bayan"] != "[:|||:]" {
+		t.Error()
+	}
+	if body != "this: is a content" {
+		t.Error(body)
+	}
+}
+
+func TestRender(t *testing.T) {
+	eval := func(a []string) ([]byte, error) {
+		return []byte("hello"), nil
+	}
+	vars := map[string]string{"foo": "bar"}
+
+	if s, err := render("plain text", vars, eval); err != nil || s != "plain text" {
+		t.Error()
+	}
+	if s, err := render("a {{greet}} text", vars, eval); err != nil || s != "a hello text" {
+		t.Error()
+	}
+	if s, err := render("{{greet}} x{{foo}}z", vars, eval); err != nil || s != "hello xbarz" {
+		t.Error()
+	}
+}