|
| 1 | +package ui |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "embed" |
| 6 | + "html/template" |
| 7 | + "io/fs" |
| 8 | + "net/http" |
| 9 | + "strings" |
| 10 | + |
| 11 | + "github.com/FileFormatInfo/svgan/internal/common" |
| 12 | +) |
| 13 | + |
| 14 | +//go:embed partials |
| 15 | +var partialsFS embed.FS |
| 16 | + |
| 17 | +//go:embed all:views |
| 18 | +var viewsFS embed.FS |
| 19 | + |
| 20 | +type TemplateFunc func(data any) (string, error) |
| 21 | + |
| 22 | +type TemplateData map[string]any |
| 23 | + |
| 24 | +var templateCache = initTemplates() |
| 25 | + |
| 26 | +func initTemplates() map[string]TemplateFunc { |
| 27 | + |
| 28 | + funcMap := template.FuncMap{ |
| 29 | + "dec": func(i int) int { |
| 30 | + return i - 1 |
| 31 | + }, |
| 32 | + "inc": func(i int) int { |
| 33 | + return i + 1 |
| 34 | + }, |
| 35 | + "loop": func(from, to int) []int { |
| 36 | + result := []int{} |
| 37 | + for i := from; i < to; i++ { |
| 38 | + result = append(result, i) |
| 39 | + } |
| 40 | + return result |
| 41 | + }, |
| 42 | + } |
| 43 | + |
| 44 | + theCache := make(map[string]TemplateFunc) |
| 45 | + |
| 46 | + var partials bytes.Buffer |
| 47 | + |
| 48 | + partialErr := fs.WalkDir(partialsFS, ".", func(path string, d fs.DirEntry, err error) error { |
| 49 | + if err != nil { |
| 50 | + return err |
| 51 | + } |
| 52 | + if !d.IsDir() { |
| 53 | + // read the partials file and append to partials |
| 54 | + content, readErr := fs.ReadFile(partialsFS, path) |
| 55 | + if readErr != nil { |
| 56 | + common.Logger.Error("unable to read partials file", "err", readErr, "filename", path) |
| 57 | + return err |
| 58 | + } |
| 59 | + partials.Write(content) |
| 60 | + } |
| 61 | + return nil |
| 62 | + }) |
| 63 | + if partialErr != nil { |
| 64 | + common.Logger.Error("unable to register partials", "err", partialErr) |
| 65 | + } |
| 66 | + |
| 67 | + viewErr := fs.WalkDir(viewsFS, ".", func(path string, d fs.DirEntry, err error) error { |
| 68 | + if err != nil { |
| 69 | + common.Logger.Error("walkdir error", "err", err) |
| 70 | + return err |
| 71 | + } |
| 72 | + if !d.IsDir() { |
| 73 | + common.Logger.Debug("registering view", "filename", path) |
| 74 | + content, readErr := fs.ReadFile(viewsFS, path) |
| 75 | + if readErr != nil { |
| 76 | + common.Logger.Error("unable to read view file", "err", readErr, "filename", path) |
| 77 | + return err |
| 78 | + } |
| 79 | + name := path[len("views/"):] |
| 80 | + |
| 81 | + var templateBuffer bytes.Buffer |
| 82 | + templateBuffer.Write(content) |
| 83 | + templateBuffer.Write(partials.Bytes()) |
| 84 | + t := template.New(name).Funcs(funcMap) |
| 85 | + template, parseErr := t.Parse(templateBuffer.String()) |
| 86 | + if parseErr != nil { |
| 87 | + common.Logger.Error("unable to parse template", "err", parseErr, "filename", path, "content", string(content)) |
| 88 | + return parseErr |
| 89 | + } |
| 90 | + theCache[name] = func(data any) (string, error) { |
| 91 | + var buf bytes.Buffer |
| 92 | + err := template.Execute(&buf, data) |
| 93 | + if err != nil { |
| 94 | + common.Logger.Error("unable to execute template", "err", err, "filename", path, "content", string(content)) |
| 95 | + return "", err |
| 96 | + } |
| 97 | + return buf.String(), nil |
| 98 | + } |
| 99 | + } |
| 100 | + return nil |
| 101 | + }) |
| 102 | + if viewErr != nil { |
| 103 | + common.Logger.Error("unable to register views", "err", viewErr) |
| 104 | + } |
| 105 | + |
| 106 | + return theCache |
| 107 | +} |
| 108 | + |
| 109 | +type CrumbtrailEntry struct { |
| 110 | + Text string |
| 111 | + URL string |
| 112 | +} |
| 113 | + |
| 114 | +func makeCrumbtrail(r *http.Request) []CrumbtrailEntry { |
| 115 | + crumbtrail := []CrumbtrailEntry{} |
| 116 | + |
| 117 | + // Add additional entries based on the request path |
| 118 | + path := r.URL.Path |
| 119 | + segments := strings.Split(path, "/") |
| 120 | + for i := 1; i < len(segments); i++ { |
| 121 | + entry := CrumbtrailEntry{ |
| 122 | + Text: segments[i], |
| 123 | + URL: strings.Join(segments[0:i+1], "/"), |
| 124 | + } |
| 125 | + crumbtrail = append(crumbtrail, entry) |
| 126 | + } |
| 127 | + |
| 128 | + return crumbtrail |
| 129 | +} |
| 130 | + |
| 131 | +func RunTemplate(w http.ResponseWriter, r *http.Request, templateName string, data TemplateData) { |
| 132 | + |
| 133 | + fn := templateCache[templateName] |
| 134 | + if fn == nil { |
| 135 | + http.NotFound(w, r) |
| 136 | + return |
| 137 | + } |
| 138 | + if data == nil { |
| 139 | + data = make(map[string]any) |
| 140 | + } |
| 141 | + data["crumbtrail"] = makeCrumbtrail(r) |
| 142 | + |
| 143 | + result, execErr := fn(data) |
| 144 | + if execErr != nil { |
| 145 | + common.Logger.Error("template failed", "err", execErr, "template", templateName) |
| 146 | + http.Error(w, "Internal Server Error", http.StatusInternalServerError) |
| 147 | + return |
| 148 | + } |
| 149 | + w.Write([]byte(result)) |
| 150 | +} |
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