Mercurial > yakumo_izuru > aya

annotate zs.go @ 33:e3c902a7380d draft

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rewritten using zs templates, allowing go templates using <% %> delimiters
author zaitsev.serge
date Wed, 02 Sep 2015 17:05:09 +0000
parents 75822e38c3e0
children ed40ca93db1e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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f5627d4212a3 restored the original amber since my issue has been fixed
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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 "gopkg.in/yaml.v1"
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20 )
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21
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22 const (
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23 ZSDIR = ".zs"
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24 PUBDIR = ".pub"
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25 )
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26
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27 type Vars map[string]string
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28
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29 // renameExt renames extension (if any) from oldext to newext
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30 // If oldext is an empty string - extension is extracted automatically.
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31 // If path has no extension - new extension is appended
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32 func renameExt(path, oldext, newext string) string {
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33 if oldext == "" {
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34 oldext = filepath.Ext(path)
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35 }
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36 if oldext == "" || strings.HasSuffix(path, oldext) {
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37 return strings.TrimSuffix(path, oldext) + newext
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38 } else {
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39 return path
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40 }
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41 }
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42
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43 // globals returns list of global OS environment variables that start
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44 // with ZS_ prefix as Vars, so the values can be used inside templates
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45 func globals() Vars {
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46 vars := Vars{}
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47 for _, e := range os.Environ() {
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48 pair := strings.Split(e, "=")
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49 if strings.HasPrefix(pair[0], "ZS_") {
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50 vars[strings.ToLower(pair[0][3:])] = pair[1]
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51 }
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52 }
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53 return vars
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54 }
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55
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56 // run executes a command or a script. Vars define the command environment,
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57 // each zs var is converted into OS environemnt variable with ZS_ prefix
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58 // prepended. Additional variable $ZS contains path to the zs binary. Command
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59 // stderr is printed to zs stderr, command output is returned as a string.
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60 func run(vars Vars, cmd string, args ...string) (string, error) {
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61 // First check if partial exists (.amber or .html)
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62 if b, err := ioutil.ReadFile(filepath.Join(ZSDIR, cmd+".amber")); err == nil {
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63 return string(b), nil
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64 }
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65 if b, err := ioutil.ReadFile(filepath.Join(ZSDIR, cmd+".html")); err == nil {
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66 return string(b), nil
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67 }
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68
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69 var errbuf, outbuf bytes.Buffer
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70 c := exec.Command(cmd, args...)
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71 env := []string{"ZS=" + os.Args[0], "ZS_OUTDIR=" + PUBDIR}
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72 env = append(env, os.Environ()...)
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73 for k, v := range vars {
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74 env = append(env, "ZS_"+strings.ToUpper(k)+"="+v)
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75 }
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76 c.Env = env
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77 c.Stdout = &outbuf
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78 c.Stderr = &errbuf
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79
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80 err := c.Run()
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81
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82 if errbuf.Len() > 0 {
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83 log.Println("ERROR:", errbuf.String())
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84 }
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85 if err != nil {
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86 return "", err
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87 }
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88 return string(outbuf.Bytes()), nil
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89 }
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90
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91 // getVars returns list of variables defined in a text file and actual file
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92 // content following the variables declaration. Header is separated from
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93 // content by an empty line. Header can be either YAML or JSON.
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94 // If no empty newline is found - file is treated as content-only.
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95 func getVars(path string, globals Vars) (Vars, string, error) {
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96 b, err := ioutil.ReadFile(path)
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97 if err != nil {
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98 return nil, "", err
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99 }
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100 s := string(b)
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101
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102 // Copy globals first
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103 v := Vars{}
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104 for name, value := range globals {
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105 v[name] = value
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106 }
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107
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108 // Override them by default values extracted from file name/path
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109 if _, err := os.Stat(filepath.Join(ZSDIR, "layout.amber")); err == nil {
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110 v["layout"] = "layout.amber"
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111 } else {
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112 v["layout"] = "layout.html"
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113 }
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114 v["file"] = path
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115 v["url"] = path[:len(path)-len(filepath.Ext(path))] + ".html"
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116 v["output"] = filepath.Join(PUBDIR, v["url"])
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117
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118 if sep := strings.Index(s, "\n\n"); sep == -1 {
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119 return v, s, nil
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120 } else {
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121 header := s[:sep]
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122 body := s[sep+len("\n\n"):]
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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 } else {
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127 for key, value := range vars {
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128 v[key] = value
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129 }
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130 }
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131 if strings.HasPrefix(v["url"], "./") {
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132 v["url"] = v["url"][2:]
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133 }
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134 return v, body, nil
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135 }
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136 }
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137
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138 // Render expanding zs plugins and variables
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139 func render(s string, vars Vars) (string, error) {
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140 delim_open := "{{"
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141 delim_close := "}}"
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142
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143 out := &bytes.Buffer{}
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144 for {
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145 if from := strings.Index(s, delim_open); from == -1 {
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146 out.WriteString(s)
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147 return out.String(), nil
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148 } else {
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149 if to := strings.Index(s, delim_close); to == -1 {
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150 return "", fmt.Errorf("Close delim not found")
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151 } else {
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152 out.WriteString(s[:from])
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153 cmd := s[from+len(delim_open) : to]
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154 s = s[to+len(delim_close):]
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155 m := strings.Fields(cmd)
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156 if len(m) == 1 {
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157 if v, ok := vars[m[0]]; ok {
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158 out.WriteString(v)
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159 continue
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160 }
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161 }
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162 if res, err := run(vars, m[0], m[1:]...); err == nil {
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163 out.WriteString(res)
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164 } else {
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165 fmt.Println(err)
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166 }
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167 }
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168 }
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169 }
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170 return s, nil
0
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171 }
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172
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173 // Renders markdown with the given layout into html expanding all the macros
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174 func buildMarkdown(path string, w io.Writer, vars Vars) error {
33
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175 v, body, err := getVars(path, vars)
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176 if err != nil {
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177 return err
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178 }
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179 content, err := render(body, v)
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180 if err != nil {
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181 return err
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182 }
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183 v["content"] = string(blackfriday.MarkdownCommon([]byte(content)))
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184 if w == nil {
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185 out, err := os.Create(filepath.Join(PUBDIR, renameExt(path, "", ".html")))
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186 if err != nil {
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187 return err
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188 }
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189 defer out.Close()
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190 w = out
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191 }
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192 if strings.HasSuffix(v["layout"], ".amber") {
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193 return buildAmber(filepath.Join(ZSDIR, v["layout"]), w, v)
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194 } else {
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195 return buildHTML(filepath.Join(ZSDIR, v["layout"]), w, v)
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196 }
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197 }
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198
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199 // Renders text file expanding all variable macros inside it
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200 func buildHTML(path string, w io.Writer, vars Vars) error {
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201 v, body, err := getVars(path, vars)
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202 if err != nil {
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203 return err
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204 }
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205 if body, err = render(body, v); err != nil {
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206 return err
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207 }
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208 tmpl, err := template.New("").Delims("<%", "%>").Parse(body)
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209 if err != nil {
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210 return err
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211 }
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212 if w == nil {
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213 f, err := os.Create(filepath.Join(PUBDIR, path))
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214 if err != nil {
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215 return err
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216 }
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217 defer f.Close()
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218 w = f
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219 }
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220 return tmpl.Execute(w, vars)
0
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221 }
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222
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223 // Renders .amber file into .html
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224 func buildAmber(path string, w io.Writer, vars Vars) error {
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225 v, body, err := getVars(path, vars)
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226 if err != nil {
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227 return err
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228 }
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229 if body, err = render(body, v); err != nil {
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230 return err
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231 }
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232
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233 a := amber.New()
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234 if err := a.Parse(body); err != nil {
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235 return err
24
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236 }
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237
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238 t, err := a.Compile()
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239 if err != nil {
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240 return err
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241 }
23
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242 if w == nil {
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243 f, err := os.Create(filepath.Join(PUBDIR, renameExt(path, ".amber", ".html")))
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244 if err != nil {
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245 return err
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246 }
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247 defer f.Close()
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248 w = f
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249 }
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250 return t.Execute(w, vars)
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251 }
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252
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253 // Compiles .gcss into .css
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254 func buildGCSS(path string, w io.Writer) error {
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255 f, err := os.Open(path)
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256 if err != nil {
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257 return err
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258 }
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259 defer f.Close()
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260
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261 if w == nil {
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262 s := strings.TrimSuffix(path, ".gcss") + ".css"
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263 css, err := os.Create(filepath.Join(PUBDIR, s))
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264 if err != nil {
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265 return err
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266 }
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267 defer css.Close()
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268 w = css
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269 }
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270 _, err = gcss.Compile(w, f)
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271 return err
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272 }
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273
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274 // Copies file as is from path to writer
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275 func buildRaw(path string, w io.Writer) error {
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276 in, err := os.Open(path)
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277 if err != nil {
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278 return err
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279 }
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280 defer in.Close()
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281 if w == nil {
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282 if out, err := os.Create(filepath.Join(PUBDIR, path)); err != nil {
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283 return err
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284 } else {
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285 defer out.Close()
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286 w = out
0
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287 }
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288 }
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289 _, err = io.Copy(w, in)
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290 return err
0
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291 }
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292
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293 func build(path string, w io.Writer, vars Vars) error {
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294 ext := filepath.Ext(path)
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295 if ext == ".md" || ext == ".mkd" {
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296 return buildMarkdown(path, w, vars)
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297 } else if ext == ".html" || ext == ".xml" {
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298 return buildHTML(path, w, vars)
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299 } else if ext == ".amber" {
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300 return buildAmber(path, w, vars)
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301 } else if ext == ".gcss" {
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302 return buildGCSS(path, w)
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303 } else {
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304 return buildRaw(path, w)
18
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305 }
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306 }
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307
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308 func buildAll(watch bool) {
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309 lastModified := time.Unix(0, 0)
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310 modified := false
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311
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312 vars := globals()
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313 for {
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314 os.Mkdir(PUBDIR, 0755)
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315 err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
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316 // ignore hidden files and directories
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317 if filepath.Base(path)[0] == '.' || strings.HasPrefix(path, ".") {
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318 return nil
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319 }
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320 // inform user about fs walk errors, but continue iteration
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321 if err != nil {
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322 log.Println("ERROR:", err)
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323 return nil
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324 }
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325
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326 if info.IsDir() {
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327 os.Mkdir(filepath.Join(PUBDIR, path), 0755)
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328 return nil
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329 } else if info.ModTime().After(lastModified) {
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330 if !modified {
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331 // First file in this build cycle is about to be modified
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332 run(vars, "prehook")
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333 modified = true
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334 }
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335 log.Println("build:", path)
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336 return build(path, nil, vars)
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337 }
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338 return nil
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339 })
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340 if err != nil {
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341 log.Println("ERROR:", err)
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342 }
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343 if modified {
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344 // At least one file in this build cycle has been modified
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345 run(vars, "posthook")
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346 modified = false
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347 }
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348 if !watch {
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349 break
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350 }
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351 lastModified = time.Now()
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352 time.Sleep(1 * time.Second)
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353 }
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354 }
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355
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356 func init() {
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357 // prepend .zs to $PATH, so plugins will be found before OS commands
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358 p := os.Getenv("PATH")
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359 p = ZSDIR + ":" + p
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360 os.Setenv("PATH", p)
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361 }
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362
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363 func main() {
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364 if len(os.Args) == 1 {
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365 fmt.Println(os.Args[0], "<command> [args]")
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366 return
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367 }
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368 cmd := os.Args[1]
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369 args := os.Args[2:]
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370 switch cmd {
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371 case "build":
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372 if len(args) == 0 {
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373 buildAll(false)
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374 } else if len(args) == 1 {
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375 if err := build(args[0], os.Stdout, globals()); err != nil {
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376 fmt.Println("ERROR: " + err.Error())
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377 }
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378 } else {
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379 fmt.Println("ERROR: too many arguments")
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380 }
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381 case "watch":
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382 buildAll(true)
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383 case "var":
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384 if len(args) == 0 {
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385 fmt.Println("var: filename expected")
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386 } else {
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387 s := ""
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388 if vars, _, err := getVars(args[0], globals()); err != nil {
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389 fmt.Println("var: " + err.Error())
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390 } else {
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391 if len(args) > 1 {
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392 for _, a := range args[1:] {
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393 s = s + vars[a] + "\n"
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394 }
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395 } else {
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396 for k, v := range vars {
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397 s = s + k + ":" + v + "\n"
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398 }
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399 }
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400 }
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401 fmt.Println(strings.TrimSpace(s))
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402 }
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403 default:
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404 if s, err := run(globals(), cmd, args...); err != nil {
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405 fmt.Println(err)
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406 } else {
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407 fmt.Println(s)
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408 }
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409 }
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410 }