| 1 | package main
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| 2 |
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| 3 | import (
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| 4 | "bytes"
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| 5 | "fmt"
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| 6 | "io"
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| 7 | "io/ioutil"
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| 8 | "log"
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| 9 | "os"
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| 10 | "os/exec"
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| 11 | "path"
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| 12 | "path/filepath"
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| 13 | "strings"
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| 14 | "time"
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| 15 |
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| 16 | "github.com/eknkc/amber"
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| 17 | "github.com/russross/blackfriday"
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| 18 | "github.com/yosssi/gcss"
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| 19 | )
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| 20 |
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| 21 | const (
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| 22 | ZSDIR = ".zs"
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| 23 | PUBDIR = ".pub"
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| 24 | )
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| 25 |
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| 26 | type Vars map[string]string
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| 27 |
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| 28 | type EvalFn func(args []string, vars Vars) (string, error)
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| 29 |
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| 30 | // Splits a string in exactly two parts by delimiter
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| 31 | // If no delimiter is found - the second string is be empty
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| 32 | func split2(s, delim string) (string, string) {
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| 33 | parts := strings.SplitN(s, delim, 2)
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| 34 | if len(parts) == 2 {
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| 35 | return parts[0], parts[1]
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| 36 | } else {
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| 37 | return parts[0], ""
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| 38 | }
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| 39 | }
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| 40 |
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| 41 | // Parses markdown content. Returns parsed header variables and content
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| 42 | func md(path string) (Vars, string, error) {
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| 43 | b, err := ioutil.ReadFile(path)
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| 44 | if err != nil {
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| 45 | return nil, "", err
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| 46 | }
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| 47 | s := string(b)
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| 48 | url := path[:len(path)-len(filepath.Ext(path))] + ".html"
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| 49 | v := Vars{
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| 50 | "file": path,
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| 51 | "url": url,
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| 52 | "output": filepath.Join(PUBDIR, url),
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| 53 | "layout": "index.html",
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| 54 | }
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| 55 | if strings.Index(s, "\n\n") == -1 {
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| 56 | return Vars{}, s, nil
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| 57 | }
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| 58 | header, body := split2(s, "\n\n")
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| 59 | for _, line := range strings.Split(header, "\n") {
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| 60 | key, value := split2(line, ":")
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| 61 | v[strings.ToLower(strings.TrimSpace(key))] = strings.TrimSpace(value)
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| 62 | }
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| 63 | if strings.HasPrefix(v["url"], "./") {
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| 64 | v["url"] = v["url"][2:]
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| 65 | }
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| 66 | return v, body, nil
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| 67 | }
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| 68 |
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| 69 | func render(s string, vars Vars, eval EvalFn) (string, error) {
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| 70 | delim_open := "{{"
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| 71 | delim_close := "}}"
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| 72 |
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| 73 | out := bytes.NewBuffer(nil)
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| 74 | for {
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| 75 | if from := strings.Index(s, delim_open); from == -1 {
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| 76 | out.WriteString(s)
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| 77 | return out.String(), nil
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| 78 | } else {
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| 79 | if to := strings.Index(s, delim_close); to == -1 {
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| 80 | return "", fmt.Errorf("Close delim not found")
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| 81 | } else {
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| 82 | out.WriteString(s[:from])
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| 83 | cmd := s[from+len(delim_open) : to]
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| 84 | s = s[to+len(delim_close):]
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| 85 | m := strings.Fields(cmd)
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| 86 | if len(m) == 1 {
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| 87 | if v, ok := vars[m[0]]; ok {
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| 88 | out.WriteString(v)
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| 89 | continue
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| 90 | }
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| 91 | }
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| 92 | if res, err := eval(m, vars); err == nil {
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| 93 | out.WriteString(res)
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| 94 | } else {
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| 95 | log.Println(err) // silent
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| 96 | }
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| 97 | }
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| 98 | }
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | // Converts zs markdown variables into environment variables
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| 103 | func env(vars Vars) []string {
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| 104 | env := []string{"ZS=" + os.Args[0], "ZS_OUTDIR=" + PUBDIR}
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| 105 | env = append(env, os.Environ()...)
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| 106 | if vars != nil {
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| 107 | for k, v := range vars {
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| 108 | env = append(env, "ZS_"+strings.ToUpper(k)+"="+v)
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| 109 | }
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| 110 | }
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| 111 | return env
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| 112 | }
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| 113 |
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| 114 | // Runs command with given arguments and variables, intercepts stderr and
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| 115 | // redirects stdout into the given writer
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| 116 | func run(cmd string, args []string, vars Vars, output io.Writer) error {
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| 117 | var errbuf bytes.Buffer
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| 118 | c := exec.Command(cmd, args...)
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| 119 | c.Env = env(vars)
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| 120 | c.Stdout = output
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| 121 | c.Stderr = &errbuf
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| 122 |
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| 123 | err := c.Run()
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| 124 |
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| 125 | if errbuf.Len() > 0 {
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| 126 | log.Println(errbuf.String())
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| 127 | }
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| 128 |
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| 129 | if err != nil {
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| 130 | return err
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| 131 | }
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| 132 | return nil
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| 133 | }
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| 134 |
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| 135 | func eval(cmd []string, vars Vars) (string, error) {
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| 136 | outbuf := bytes.NewBuffer(nil)
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| 137 | err := run(path.Join(ZSDIR, cmd[0]), cmd[1:], vars, outbuf)
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| 138 | if err != nil {
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| 139 | if _, ok := err.(*exec.ExitError); ok {
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| 140 | return "", err
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| 141 | }
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| 142 | outbuf = bytes.NewBuffer(nil)
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| 143 | err := run(cmd[0], cmd[1:], vars, outbuf)
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| 144 | // Return exit errors, but ignore if the command was not found
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| 145 | if _, ok := err.(*exec.ExitError); ok {
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| 146 | return "", err
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| 147 | }
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| 148 | }
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| 149 | return outbuf.String(), nil
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| 150 | }
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| 151 |
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| 152 | func buildMarkdown(path string) error {
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| 153 | v, body, err := md(path)
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| 154 | if err != nil {
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| 155 | return err
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| 156 | }
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| 157 | content, err := render(body, v, eval)
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| 158 | if err != nil {
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| 159 | return err
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| 160 | }
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| 161 | v["content"] = string(blackfriday.MarkdownBasic([]byte(content)))
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| 162 | return buildPlain(filepath.Join(ZSDIR, v["layout"]), v)
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| 163 | }
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| 164 |
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| 165 | func buildPlain(path string, vars Vars) error {
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| 166 | b, err := ioutil.ReadFile(path)
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| 167 | if err != nil {
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| 168 | return err
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| 169 | }
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| 170 | content, err := render(string(b), vars, eval)
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| 171 | if err != nil {
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| 172 | return err
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| 173 | }
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| 174 | output := filepath.Join(PUBDIR, path)
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| 175 | if s, ok := vars["output"]; ok {
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| 176 | output = s
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| 177 | }
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| 178 | err = ioutil.WriteFile(output, []byte(content), 0666)
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| 179 | if err != nil {
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| 180 | return err
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| 181 | }
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| 182 | return nil
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| 183 | }
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| 184 |
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| 185 | func buildGCSS(path string) error {
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| 186 | f, err := os.Open(path)
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| 187 | if err != nil {
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| 188 | return err
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| 189 | }
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| 190 | s := strings.TrimSuffix(path, ".gcss") + ".css"
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| 191 | log.Println(s)
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| 192 | css, err := os.Create(filepath.Join(PUBDIR, s))
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| 193 | if err != nil {
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| 194 | return err
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| 195 | }
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| 196 |
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| 197 | defer f.Close()
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| 198 | defer css.Close()
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| 199 |
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| 200 | _, err = gcss.Compile(css, f)
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| 201 | return err
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| 202 | }
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| 203 |
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| 204 | func buildAmber(path string, vars Vars) error {
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| 205 | a := amber.New()
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| 206 | err := a.ParseFile(path)
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| 207 | if err != nil {
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| 208 | return err
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| 209 | }
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| 210 | t, err := a.Compile()
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| 211 | if err != nil {
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| 212 | return err
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| 213 | }
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| 214 | //amber.FuncMap = amber.FuncMap
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| 215 | s := strings.TrimSuffix(path, ".amber") + ".html"
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| 216 | f, err := os.Create(filepath.Join(PUBDIR, s))
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| 217 | if err != nil {
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| 218 | return err
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| 219 | }
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| 220 | defer f.Close()
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| 221 | return t.Execute(f, vars)
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| 222 | }
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| 223 |
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| 224 | func copyFile(path string) (err error) {
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| 225 | var in, out *os.File
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| 226 | if in, err = os.Open(path); err == nil {
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| 227 | defer in.Close()
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| 228 | if out, err = os.Create(filepath.Join(PUBDIR, path)); err == nil {
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| 229 | defer out.Close()
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| 230 | _, err = io.Copy(out, in)
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| 231 | }
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| 232 | }
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| 233 | return err
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| 234 | }
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| 235 |
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| 236 | func buildAll(once bool) {
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| 237 | lastModified := time.Unix(0, 0)
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| 238 | modified := false
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| 239 | for {
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| 240 | os.Mkdir(PUBDIR, 0755)
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| 241 | err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
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| 242 | // ignore hidden files and directories
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| 243 | if filepath.Base(path)[0] == '.' || strings.HasPrefix(path, ".") {
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| 244 | return nil
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| 245 | }
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| 246 |
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| 247 | if info.IsDir() {
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| 248 | os.Mkdir(filepath.Join(PUBDIR, path), 0755)
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| 249 | return nil
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| 250 | } else if info.ModTime().After(lastModified) {
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| 251 | if !modified {
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| 252 | // About to be modified, so run pre-build hook
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| 253 | run(filepath.Join(ZSDIR, "pre"), []string{}, nil, nil)
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| 254 | modified = true
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| 255 | }
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| 256 | ext := filepath.Ext(path)
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| 257 | if ext == ".md" || ext == ".mkd" {
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| 258 | log.Println("md: ", path)
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| 259 | return buildMarkdown(path)
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| 260 | } else if ext == ".html" || ext == ".xml" {
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| 261 | log.Println("html: ", path)
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| 262 | return buildPlain(path, Vars{})
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| 263 | } else if ext == ".amber" {
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| 264 | log.Println("html: ", path)
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| 265 | return buildAmber(path, Vars{})
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| 266 | } else if ext == ".gcss" {
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| 267 | log.Println("css: ", path)
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| 268 | return buildGCSS(path)
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| 269 | } else {
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| 270 | log.Println("raw: ", path)
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| 271 | return copyFile(path)
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| 272 | }
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| 273 | }
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| 274 | return nil
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| 275 | })
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| 276 | if err != nil {
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| 277 | log.Println("ERROR:", err)
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| 278 | }
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| 279 | if modified {
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| 280 | // Something was modified, so post-build hook
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| 281 | run(filepath.Join(ZSDIR, "post"), []string{}, nil, nil)
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| 282 | modified = false
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| 283 | }
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| 284 | lastModified = time.Now()
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| 285 | if once {
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| 286 | break
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| 287 | }
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| 288 | time.Sleep(1 * time.Second)
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| 289 | }
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| 290 | }
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| 291 |
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| 292 | func main() {
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| 293 | if len(os.Args) == 1 {
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| 294 | fmt.Println(os.Args[0], "<command> [args]")
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| 295 | return
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| 296 | }
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| 297 | cmd := os.Args[1]
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| 298 | args := os.Args[2:]
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| 299 | switch cmd {
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| 300 | case "build":
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| 301 | buildAll(true)
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| 302 | case "watch":
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| 303 | buildAll(false) // pass duration
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| 304 | case "var":
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| 305 | if len(args) == 0 {
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| 306 | log.Println("ERROR: filename expected")
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| 307 | return
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| 308 | }
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| 309 | if vars, _, err := md(args[0]); err == nil {
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| 310 | if len(args) > 1 {
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| 311 | for _, a := range args[1:] {
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| 312 | fmt.Println(vars[a])
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| 313 | }
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| 314 | } else {
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| 315 | for k, v := range vars {
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| 316 | fmt.Println(k + ":" + v)
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| 317 | }
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| 318 | }
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| 319 | } else {
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| 320 | log.Println(err)
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| 321 | }
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| 322 | default:
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| 323 | err := run(path.Join(ZSDIR, cmd), args, Vars{}, os.Stdout)
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| 324 | if err != nil {
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| 325 | log.Println(err)
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| 326 | }
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| 327 | }
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| 328 | }
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