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| 1 | +// Copyright 2012 The Go Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +package main |
| 6 | + |
| 7 | +import ( |
| 8 | + "html/template" |
| 9 | + "io" |
| 10 | + "log" |
| 11 | + "net/http" |
| 12 | + "os" |
| 13 | + "path/filepath" |
| 14 | + "sort" |
| 15 | + |
| 16 | + "golang.org/x/tools/present" |
| 17 | +) |
| 18 | + |
| 19 | +func init() { |
| 20 | + http.HandleFunc("/", dirHandler) |
| 21 | +} |
| 22 | + |
| 23 | +// dirHandler serves a directory listing for the requested path, rooted at basePath. |
| 24 | +func dirHandler(w http.ResponseWriter, r *http.Request) { |
| 25 | + if r.URL.Path == "/favicon.ico" { |
| 26 | + http.Error(w, "not found", 404) |
| 27 | + return |
| 28 | + } |
| 29 | + const base = "." |
| 30 | + name := filepath.Join(base, r.URL.Path) |
| 31 | + if isDoc(name) { |
| 32 | + err := renderDoc(w, name) |
| 33 | + if err != nil { |
| 34 | + log.Println(err) |
| 35 | + http.Error(w, err.Error(), 500) |
| 36 | + } |
| 37 | + return |
| 38 | + } |
| 39 | + if isDir, err := dirList(w, name); err != nil { |
| 40 | + log.Println(err) |
| 41 | + http.Error(w, err.Error(), 500) |
| 42 | + return |
| 43 | + } else if isDir { |
| 44 | + return |
| 45 | + } |
| 46 | + http.FileServer(http.Dir(base)).ServeHTTP(w, r) |
| 47 | +} |
| 48 | + |
| 49 | +func isDoc(path string) bool { |
| 50 | + _, ok := contentTemplate[filepath.Ext(path)] |
| 51 | + return ok |
| 52 | +} |
| 53 | + |
| 54 | +var ( |
| 55 | + // dirListTemplate holds the front page template. |
| 56 | + dirListTemplate *template.Template |
| 57 | + |
| 58 | + // contentTemplate maps the presentable file extensions to the |
| 59 | + // template to be executed. |
| 60 | + contentTemplate map[string]*template.Template |
| 61 | +) |
| 62 | + |
| 63 | +func initTemplates(base string) error { |
| 64 | + // Locate the template file. |
| 65 | + actionTmpl := filepath.Join(base, "templates/action.tmpl") |
| 66 | + |
| 67 | + contentTemplate = make(map[string]*template.Template) |
| 68 | + |
| 69 | + for ext, contentTmpl := range map[string]string{ |
| 70 | + ".slide": "slides.tmpl", |
| 71 | + ".article": "article.tmpl", |
| 72 | + } { |
| 73 | + contentTmpl = filepath.Join(base, "templates", contentTmpl) |
| 74 | + |
| 75 | + // Read and parse the input. |
| 76 | + tmpl := present.Template() |
| 77 | + tmpl = tmpl.Funcs(template.FuncMap{"playable": playable}) |
| 78 | + if _, err := tmpl.ParseFiles(actionTmpl, contentTmpl); err != nil { |
| 79 | + return err |
| 80 | + } |
| 81 | + contentTemplate[ext] = tmpl |
| 82 | + } |
| 83 | + |
| 84 | + var err error |
| 85 | + dirListTemplate, err = template.ParseFiles(filepath.Join(base, "templates/dir.tmpl")) |
| 86 | + if err != nil { |
| 87 | + return err |
| 88 | + } |
| 89 | + |
| 90 | + return nil |
| 91 | +} |
| 92 | + |
| 93 | +// renderDoc reads the present file, gets its template representation, |
| 94 | +// and executes the template, sending output to w. |
| 95 | +func renderDoc(w io.Writer, docFile string) error { |
| 96 | + // Read the input and build the doc structure. |
| 97 | + doc, err := parse(docFile, 0) |
| 98 | + if err != nil { |
| 99 | + return err |
| 100 | + } |
| 101 | + |
| 102 | + // Find which template should be executed. |
| 103 | + tmpl := contentTemplate[filepath.Ext(docFile)] |
| 104 | + |
| 105 | + // Execute the template. |
| 106 | + return doc.Render(w, tmpl) |
| 107 | +} |
| 108 | + |
| 109 | +func parse(name string, mode present.ParseMode) (*present.Doc, error) { |
| 110 | + f, err := os.Open(name) |
| 111 | + if err != nil { |
| 112 | + return nil, err |
| 113 | + } |
| 114 | + defer f.Close() |
| 115 | + return present.Parse(f, name, 0) |
| 116 | +} |
| 117 | + |
| 118 | +// dirList scans the given path and writes a directory listing to w. |
| 119 | +// It parses the first part of each .slide file it encounters to display the |
| 120 | +// presentation title in the listing. |
| 121 | +// If the given path is not a directory, it returns (isDir == false, err == nil) |
| 122 | +// and writes nothing to w. |
| 123 | +func dirList(w io.Writer, name string) (isDir bool, err error) { |
| 124 | + f, err := os.Open(name) |
| 125 | + if err != nil { |
| 126 | + return false, err |
| 127 | + } |
| 128 | + defer f.Close() |
| 129 | + fi, err := f.Stat() |
| 130 | + if err != nil { |
| 131 | + return false, err |
| 132 | + } |
| 133 | + if isDir = fi.IsDir(); !isDir { |
| 134 | + return false, nil |
| 135 | + } |
| 136 | + fis, err := f.Readdir(0) |
| 137 | + if err != nil { |
| 138 | + return false, err |
| 139 | + } |
| 140 | + d := &dirListData{Path: name} |
| 141 | + for _, fi := range fis { |
| 142 | + // skip the golang.org directory |
| 143 | + if name == "." && fi.Name() == "golang.org" { |
| 144 | + continue |
| 145 | + } |
| 146 | + e := dirEntry{ |
| 147 | + Name: fi.Name(), |
| 148 | + Path: filepath.ToSlash(filepath.Join(name, fi.Name())), |
| 149 | + } |
| 150 | + if fi.IsDir() && showDir(e.Name) { |
| 151 | + d.Dirs = append(d.Dirs, e) |
| 152 | + continue |
| 153 | + } |
| 154 | + if isDoc(e.Name) { |
| 155 | + if p, err := parse(e.Path, present.TitlesOnly); err != nil { |
| 156 | + log.Println(err) |
| 157 | + } else { |
| 158 | + e.Title = p.Title |
| 159 | + } |
| 160 | + switch filepath.Ext(e.Path) { |
| 161 | + case ".article": |
| 162 | + d.Articles = append(d.Articles, e) |
| 163 | + case ".slide": |
| 164 | + d.Slides = append(d.Slides, e) |
| 165 | + } |
| 166 | + } else if showFile(e.Name) { |
| 167 | + d.Other = append(d.Other, e) |
| 168 | + } |
| 169 | + } |
| 170 | + if d.Path == "." { |
| 171 | + d.Path = "" |
| 172 | + } |
| 173 | + sort.Sort(d.Dirs) |
| 174 | + sort.Sort(d.Slides) |
| 175 | + sort.Sort(d.Articles) |
| 176 | + sort.Sort(d.Other) |
| 177 | + return true, dirListTemplate.Execute(w, d) |
| 178 | +} |
| 179 | + |
| 180 | +// showFile reports whether the given file should be displayed in the list. |
| 181 | +func showFile(n string) bool { |
| 182 | + switch filepath.Ext(n) { |
| 183 | + case ".pdf": |
| 184 | + case ".html": |
| 185 | + case ".go": |
| 186 | + default: |
| 187 | + return isDoc(n) |
| 188 | + } |
| 189 | + return true |
| 190 | +} |
| 191 | + |
| 192 | +// showDir reports whether the given directory should be displayed in the list. |
| 193 | +func showDir(n string) bool { |
| 194 | + if len(n) > 0 && (n[0] == '.' || n[0] == '_') || n == "present" { |
| 195 | + return false |
| 196 | + } |
| 197 | + return true |
| 198 | +} |
| 199 | + |
| 200 | +type dirListData struct { |
| 201 | + Path string |
| 202 | + Dirs, Slides, Articles, Other dirEntrySlice |
| 203 | +} |
| 204 | + |
| 205 | +type dirEntry struct { |
| 206 | + Name, Path, Title string |
| 207 | +} |
| 208 | + |
| 209 | +type dirEntrySlice []dirEntry |
| 210 | + |
| 211 | +func (s dirEntrySlice) Len() int { return len(s) } |
| 212 | +func (s dirEntrySlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] } |
| 213 | +func (s dirEntrySlice) Less(i, j int) bool { return s[i].Name < s[j].Name } |
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