zs/zs.go

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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)
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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], ""
}
}
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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",
}
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if strings.Index(s, "\n\n") == -1 {
return map[string]string{}, s
}
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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)
}
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if strings.HasPrefix(v["url"], "./") {
v["url"] = v["url"][2:]
}
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return v, body
}
func render(s string, vars map[string]string, eval EvalFn) (string, error) {
delim_open := "{{"
delim_close := "}}"
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out := bytes.NewBuffer(nil)
for {
if from := strings.Index(s, delim_open); from == -1 {
out.WriteString(s)
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return out.String(), nil
} else {
if to := strings.Index(s, delim_close); to == -1 {
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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)
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if len(m) == 1 {
if v, ok := vars[m[0]]; ok {
out.WriteString(v)
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continue
}
}
if res, err := eval(m, vars); err == nil {
out.WriteString(res)
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} 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)
}
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}
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
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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 {
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if _, ok := err.(*exec.ExitError); ok {
return "", err
}
outbuf = bytes.NewBuffer(nil)
err := run(cmd[0], cmd[1:], vars, outbuf)
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// Return exit errors, but ignore if the command was not found
if _, ok := err.(*exec.ExitError); ok {
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return "", err
}
}
return outbuf.String(), nil
}
func buildMarkdown(path string) error {
b, err := ioutil.ReadFile(path)
if err != nil {
return err
}
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v, body := md(path, string(b))
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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 copyFile(path string) (err error) {
var in, out *os.File
if in, err = os.Open(path); err == nil {
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defer in.Close()
if out, err = os.Create(filepath.Join(PUBDIR, path)); err == nil {
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defer out.Close()
_, err = io.Copy(out, in)
}
}
return err
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}
func buildAll(once bool) {
lastModified := time.Unix(0, 0)
modified := false
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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
}
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ext := filepath.Ext(path)
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if ext == ".md" || ext == ".mkd" {
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log.Println("mkd: ", path)
return buildMarkdown(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
run(filepath.Join(ZSDIR, "post"), []string{}, nil, nil)
modified = false
}
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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 {
log.Println("ERROR: filename expected")
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return
}
if b, err := ioutil.ReadFile(args[0]); err == nil {
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vars, _ := md(args[0], string(b))
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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)
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}
default:
err := run(path.Join(ZSDIR, cmd), args, map[string]string{}, os.Stdout)
if err != nil {
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log.Println(err)
}
}
}