| [48] | 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/filepath"
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| 12 | "strings"
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| 13 | "text/template"
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| 14 | "time"
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| 15 |
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| 16 | "github.com/russross/blackfriday/v2"
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| 17 | "gopkg.in/yaml.v2"
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| 18 | )
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| 19 |
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| 20 | const (
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| 21 | ZSDIR = ".zs"
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| 22 | PUBDIR = ".pub"
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| 23 | )
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| 24 |
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| 25 | type Vars map[string]string
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| 26 |
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| 27 | // renameExt renames extension (if any) from oldext to newext
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| 28 | // If oldext is an empty string - extension is extracted automatically.
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| 29 | // If path has no extension - new extension is appended
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| 30 | func renameExt(path, oldext, newext string) string {
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| 31 | if oldext == "" {
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| 32 | oldext = filepath.Ext(path)
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| 33 | }
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| 34 | if oldext == "" || strings.HasSuffix(path, oldext) {
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| 35 | return strings.TrimSuffix(path, oldext) + newext
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| 36 | } else {
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| 37 | return path
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| 38 | }
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| 39 | }
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| 40 |
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| 41 | // globals returns list of global OS environment variables that start
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| 42 | // with ZS_ prefix as Vars, so the values can be used inside templates
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| 43 | func globals() Vars {
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| 44 | vars := Vars{}
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| 45 | for _, e := range os.Environ() {
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| 46 | pair := strings.Split(e, "=")
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| 47 | if strings.HasPrefix(pair[0], "ZS_") {
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| 48 | vars[strings.ToLower(pair[0][3:])] = pair[1]
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| 49 | }
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| 50 | }
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| 51 | return vars
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| 52 | }
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| 53 |
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| 54 | // run executes a command or a script. Vars define the command environment,
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| 55 | // each zs var is converted into OS environemnt variable with ZS_ prefix
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| 56 | // prepended. Additional variable $ZS contains path to the zs binary. Command
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| 57 | // stderr is printed to zs stderr, command output is returned as a string.
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| 58 | func run(vars Vars, cmd string, args ...string) (string, error) {
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| 59 | // First check if partial exists (.html)
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| 60 | if b, err := ioutil.ReadFile(filepath.Join(ZSDIR, cmd+".html")); err == nil {
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| 61 | return string(b), nil
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| 62 | }
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| 63 |
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| 64 | var errbuf, outbuf bytes.Buffer
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| 65 | c := exec.Command(cmd, args...)
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| 66 | env := []string{"ZS=" + os.Args[0], "ZS_OUTDIR=" + PUBDIR}
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| 67 | env = append(env, os.Environ()...)
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| 68 | for k, v := range vars {
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| 69 | env = append(env, "ZS_"+strings.ToUpper(k)+"="+v)
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| 70 | }
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| 71 | c.Env = env
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| 72 | c.Stdout = &outbuf
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| 73 | c.Stderr = &errbuf
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| 74 |
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| 75 | err := c.Run()
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| 76 |
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| 77 | if errbuf.Len() > 0 {
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| 78 | log.Println("ERROR:", errbuf.String())
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| 79 | }
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| 80 | if err != nil {
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| 81 | return "", err
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| 82 | }
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| 83 | return string(outbuf.Bytes()), nil
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| 84 | }
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| 85 |
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| 86 | // getVars returns list of variables defined in a text file and actual file
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| 87 | // content following the variables declaration. Header is separated from
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| 88 | // content by an empty line. Header can be either YAML or JSON.
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| 89 | // If no empty newline is found - file is treated as content-only.
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| 90 | func getVars(path string, globals Vars) (Vars, string, error) {
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| 91 | b, err := ioutil.ReadFile(path)
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| 92 | if err != nil {
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| 93 | return nil, "", err
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| 94 | }
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| 95 | s := string(b)
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| 96 |
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| 97 | // Pick some default values for content-dependent variables
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| 98 | v := Vars{}
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| 99 | title := strings.Replace(strings.Replace(path, "_", " ", -1), "-", " ", -1)
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| 100 | v["title"] = strings.ToTitle(title)
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| 101 | v["description"] = ""
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| 102 | v["file"] = path
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| 103 | v["url"] = path[:len(path)-len(filepath.Ext(path))] + ".html"
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| 104 | v["output"] = filepath.Join(PUBDIR, v["url"])
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| 105 |
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| 106 | // Override default values with globals
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| 107 | for name, value := range globals {
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| 108 | v[name] = value
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| 109 | }
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| 110 |
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| 111 | // Add layout if none is specified
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| 112 | if _, ok := v["layout"]; !ok {
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| 113 | v["layout"] = "layout.html"
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| 114 | }
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| 115 |
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| 116 | delim := "\n---\n"
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| 117 | if sep := strings.Index(s, delim); sep == -1 {
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| 118 | return v, s, nil
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| 119 | } else {
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| 120 | header := s[:sep]
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| 121 | body := s[sep+len(delim):]
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| 122 |
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| 123 | vars := Vars{}
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| 124 | if err := yaml.Unmarshal([]byte(header), &vars); err != nil {
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| 125 | fmt.Println("ERROR: failed to parse header", err)
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| 126 | return nil, "", err
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| 127 | } else {
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| 128 | // Override default values + globals with the ones defines in the file
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| 129 | for key, value := range vars {
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| 130 | v[key] = value
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| 131 | }
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| 132 | }
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| 133 | if strings.HasPrefix(v["url"], "./") {
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| 134 | v["url"] = v["url"][2:]
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| 135 | }
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| 136 | return v, body, nil
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | // Render expanding zs plugins and variables
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| 141 | func render(s string, vars Vars) (string, error) {
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| 142 | delim_open := "{{"
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| 143 | delim_close := "}}"
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| 144 |
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| 145 | out := &bytes.Buffer{}
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| 146 | for {
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| 147 | if from := strings.Index(s, delim_open); from == -1 {
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| 148 | out.WriteString(s)
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| 149 | return out.String(), nil
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| 150 | } else {
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| 151 | if to := strings.Index(s, delim_close); to == -1 {
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| 152 | return "", fmt.Errorf("Close delim not found")
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| 153 | } else {
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| 154 | out.WriteString(s[:from])
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| 155 | cmd := s[from+len(delim_open) : to]
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| 156 | s = s[to+len(delim_close):]
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| 157 | m := strings.Fields(cmd)
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| 158 | if len(m) == 1 {
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| 159 | if v, ok := vars[m[0]]; ok {
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| 160 | out.WriteString(v)
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| 161 | continue
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| 162 | }
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| 163 | }
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| 164 | if res, err := run(vars, m[0], m[1:]...); err == nil {
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| 165 | out.WriteString(res)
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| 166 | } else {
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| 167 | fmt.Println(err)
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| 168 | }
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| 169 | }
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| 170 | }
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| 171 | }
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| 172 | return s, nil
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| 173 | }
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| 174 |
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| 175 | // Renders markdown with the given layout into html expanding all the macros
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| 176 | func buildMarkdown(path string, w io.Writer, vars Vars) error {
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| 177 | v, body, err := getVars(path, vars)
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| 178 | if err != nil {
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| 179 | return err
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| 180 | }
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| 181 | content, err := render(body, v)
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| 182 | if err != nil {
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| 183 | return err
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| 184 | }
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| [52] | 185 | v["content"] = string(blackfriday.Run(
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| 186 | []byte(content),
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| 187 | blackfriday.WithExtensions(blackfriday.CommonExtensions|blackfriday.AutoHeadingIDs),
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| 188 | ))
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| [48] | 189 | if w == nil {
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| 190 | out, err := os.Create(filepath.Join(PUBDIR, renameExt(path, "", ".html")))
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| 191 | if err != nil {
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| 192 | return err
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| 193 | }
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| 194 | defer out.Close()
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| 195 | w = out
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| 196 | }
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| 197 | return buildHTML(filepath.Join(ZSDIR, v["layout"]), w, v)
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| 198 | }
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| 199 |
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| 200 | // Renders text file expanding all variable macros inside it
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| 201 | func buildHTML(path string, w io.Writer, vars Vars) error {
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| 202 | v, body, err := getVars(path, vars)
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| 203 | if err != nil {
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| 204 | return err
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| 205 | }
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| 206 | if body, err = render(body, v); err != nil {
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| 207 | return err
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| 208 | }
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| 209 | tmpl, err := template.New("").Delims("<%", "%>").Parse(body)
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| 210 | if err != nil {
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| 211 | return err
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| 212 | }
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| 213 | if w == nil {
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| 214 | f, err := os.Create(filepath.Join(PUBDIR, path))
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| 215 | if err != nil {
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| 216 | return err
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| 217 | }
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| 218 | defer f.Close()
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| 219 | w = f
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| 220 | }
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| 221 | return tmpl.Execute(w, vars)
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| 222 | }
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| 223 |
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| 224 | // Copies file as is from path to writer
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| 225 | func buildRaw(path string, w io.Writer) error {
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| 226 | in, err := os.Open(path)
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| 227 | if err != nil {
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| 228 | return err
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| 229 | }
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| 230 | defer in.Close()
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| 231 | if w == nil {
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| 232 | if out, err := os.Create(filepath.Join(PUBDIR, path)); err != nil {
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| 233 | return err
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| 234 | } else {
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| 235 | defer out.Close()
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| 236 | w = out
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| 237 | }
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| 238 | }
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| 239 | _, err = io.Copy(w, in)
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| 240 | return err
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| 241 | }
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| 242 |
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| 243 | func build(path string, w io.Writer, vars Vars) error {
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| 244 | ext := filepath.Ext(path)
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| 245 | if ext == ".md" || ext == ".mkd" {
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| 246 | return buildMarkdown(path, w, vars)
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| 247 | } else if ext == ".html" || ext == ".xml" {
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| 248 | return buildHTML(path, w, vars)
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| 249 | } else {
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| 250 | return buildRaw(path, w)
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| 251 | }
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| 252 | }
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| 253 |
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| 254 | func buildAll(watch bool) {
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| 255 | lastModified := time.Unix(0, 0)
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| 256 | modified := false
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| 257 |
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| 258 | vars := globals()
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| 259 | for {
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| 260 | os.Mkdir(PUBDIR, 0755)
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| 261 | filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
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| 262 | // ignore hidden files and directories
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| 263 | if filepath.Base(path)[0] == '.' || strings.HasPrefix(path, ".") {
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| 264 | return nil
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| 265 | }
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| 266 | // inform user about fs walk errors, but continue iteration
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| 267 | if err != nil {
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| 268 | fmt.Println("error:", err)
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| 269 | return nil
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| 270 | }
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| 271 |
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| 272 | if info.IsDir() {
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| 273 | os.Mkdir(filepath.Join(PUBDIR, path), 0755)
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| 274 | return nil
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| 275 | } else if info.ModTime().After(lastModified) {
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| 276 | if !modified {
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| 277 | // First file in this build cycle is about to be modified
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| 278 | run(vars, "prehook")
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| 279 | modified = true
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| 280 | }
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| 281 | log.Println("build:", path)
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| 282 | return build(path, nil, vars)
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| 283 | }
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| 284 | return nil
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| 285 | })
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| 286 | if modified {
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| 287 | // At least one file in this build cycle has been modified
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| 288 | run(vars, "posthook")
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| 289 | modified = false
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| 290 | }
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| 291 | if !watch {
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| 292 | break
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| 293 | }
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| 294 | lastModified = time.Now()
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| 295 | time.Sleep(1 * time.Second)
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| 296 | }
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| 297 | }
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| 298 |
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| 299 | func init() {
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| 300 | // prepend .zs to $PATH, so plugins will be found before OS commands
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| 301 | p := os.Getenv("PATH")
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| 302 | p = ZSDIR + ":" + p
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| 303 | os.Setenv("PATH", p)
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| 304 | }
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| 305 |
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| 306 | func main() {
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| 307 | if len(os.Args) == 1 {
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| 308 | fmt.Println(os.Args[0], "<command> [args]")
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| 309 | return
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| 310 | }
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| 311 | cmd := os.Args[1]
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| 312 | args := os.Args[2:]
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| 313 | switch cmd {
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| 314 | case "build":
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| 315 | if len(args) == 0 {
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| 316 | buildAll(false)
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| 317 | } else if len(args) == 1 {
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| 318 | if err := build(args[0], os.Stdout, globals()); err != nil {
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| 319 | fmt.Println("ERROR: " + err.Error())
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| 320 | }
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| 321 | } else {
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| 322 | fmt.Println("ERROR: too many arguments")
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| 323 | }
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| 324 | case "watch":
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| 325 | buildAll(true)
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| 326 | case "var":
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| 327 | if len(args) == 0 {
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| 328 | fmt.Println("var: filename expected")
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| 329 | } else {
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| 330 | s := ""
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| 331 | if vars, _, err := getVars(args[0], Vars{}); err != nil {
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| 332 | fmt.Println("var: " + err.Error())
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| 333 | } else {
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| 334 | if len(args) > 1 {
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| 335 | for _, a := range args[1:] {
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| 336 | s = s + vars[a] + "\n"
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| 337 | }
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| 338 | } else {
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| 339 | for k, v := range vars {
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| 340 | s = s + k + ":" + v + "\n"
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| 341 | }
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| 342 | }
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| 343 | }
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| 344 | fmt.Println(strings.TrimSpace(s))
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| 345 | }
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| 346 | default:
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| 347 | if s, err := run(globals(), cmd, args...); err != nil {
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| 348 | fmt.Println(err)
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| 349 | } else {
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| 350 | fmt.Println(s)
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| 351 | }
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| 352 | }
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| 353 | }
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