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import ( "crypto/hmac" "crypto/sha256" "encoding/hex" "errors" "fmt" "html" "html/template" "log" "math" "net/url" "path/filepath" "reflect" "strings" "time"
"github.com/dustin/go-humanize" "github.com/microcosm-cc/bluemonday" "tangled.sh/tangled.sh/core/appview/filetree" "tangled.sh/tangled.sh/core/appview/pages/markup")
func (p *Pages) funcMap() template.FuncMap { return template.FuncMap{ "split": func(s string) []string { return strings.Split(s, "\n") }, "truncateAt30": func(s string) string { if len(s) <= 30 { return s } return s[:30] + "…" }, "splitOn": func(s, sep string) []string { return strings.Split(s, sep) }, "int64": func(a int) int64 { return int64(a) }, "add": func(a, b int) int { return a + b }, "now": func() time.Time { return time.Now() }, // the absolute state of go templates "add64": func(a, b int64) int64 { return a + b }, "sub": func(a, b int) int { return a - b }, "f64": func(a int) float64 { return float64(a) }, "addf64": func(a, b float64) float64 { return a + b }, "subf64": func(a, b float64) float64 { return a - b }, "mulf64": func(a, b float64) float64 { return a * b }, "divf64": func(a, b float64) float64 { if b == 0 { return 0 } return a / b }, "negf64": func(a float64) float64 { return -a }, "cond": func(cond interface{}, a, b string) string { if cond == nil { return b }
if boolean, ok := cond.(bool); boolean && ok { return a }
return b }, "didOrHandle": func(did, handle string) string { if handle != "" { return fmt.Sprintf("@%s", handle) } else { return did } }, "assoc": func(values ...string) ([][]string, error) { if len(values)%2 != 0 { return nil, fmt.Errorf("invalid assoc call, must have an even number of arguments") } pairs := make([][]string, 0) for i := 0; i < len(values); i += 2 { pairs = append(pairs, []string{values[i], values[i+1]}) } return pairs, nil }, "append": func(s []string, values ...string) []string { s = append(s, values...) return s }, "timeFmt": humanize.Time, "longTimeFmt": func(t time.Time) string { return t.Format("2006-01-02 * 3:04 PM") }, "commaFmt": humanize.Comma, "shortTimeFmt": func(t time.Time) string { return humanize.CustomRelTime(t, time.Now(), "", "", []humanize.RelTimeMagnitude{ {time.Second, "now", time.Second}, {2 * time.Second, "1s %s", 1}, {time.Minute, "%ds %s", time.Second}, {2 * time.Minute, "1min %s", 1}, {time.Hour, "%dmin %s", time.Minute}, {2 * time.Hour, "1hr %s", 1}, {humanize.Day, "%dhrs %s", time.Hour}, {2 * humanize.Day, "1d %s", 1}, {20 * humanize.Day, "%dd %s", humanize.Day}, {8 * humanize.Week, "%dw %s", humanize.Week}, {humanize.Year, "%dmo %s", humanize.Month}, {18 * humanize.Month, "1y %s", 1}, {2 * humanize.Year, "2y %s", 1}, {humanize.LongTime, "%dy %s", humanize.Year}, {math.MaxInt64, "a long while %s", 1}, }) }, "durationFmt": func(duration time.Duration) string { days := int64(duration.Hours() / 24) hours := int64(math.Mod(duration.Hours(), 24)) minutes := int64(math.Mod(duration.Minutes(), 60)) seconds := int64(math.Mod(duration.Seconds(), 60))
chunks := []struct { name string amount int64 }{ {"d", days}, {"hr", hours}, {"min", minutes}, {"s", seconds}, }
parts := []string{}
for _, chunk := range chunks { if chunk.amount != 0 { parts = append(parts, fmt.Sprintf("%d%s", chunk.amount, chunk.name)) } }
return strings.Join(parts, " ") }, "byteFmt": humanize.Bytes, "length": func(slice any) int { v := reflect.ValueOf(slice) if v.Kind() == reflect.Slice || v.Kind() == reflect.Array { return v.Len() } return 0 }, "splitN": func(s, sep string, n int) []string { return strings.SplitN(s, sep, n) }, "escapeHtml": func(s string) template.HTML { if s == "" { return template.HTML("<br>") } return template.HTML(s) }, "unescapeHtml": func(s string) string { return html.UnescapeString(s) }, "nl2br": func(text string) template.HTML { return template.HTML(strings.Replace(template.HTMLEscapeString(text), "\n", "<br>", -1)) }, "unwrapText": func(text string) string { paragraphs := strings.Split(text, "\n\n")
for i, p := range paragraphs { lines := strings.Split(p, "\n") paragraphs[i] = strings.Join(lines, " ") }
return strings.Join(paragraphs, "\n\n") }, "sequence": func(n int) []struct{} { return make([]struct{}, n) }, // take atmost N items from this slice "take": func(slice any, n int) any { v := reflect.ValueOf(slice) if v.Kind() != reflect.Slice && v.Kind() != reflect.Array { return nil } if v.Len() == 0 { return nil } return v.Slice(0, min(n, v.Len()-1)).Interface() },
"markdown": func(text string) template.HTML { rctx := &markup.RenderContext{RendererType: markup.RendererTypeDefault} return template.HTML(bluemonday.UGCPolicy().Sanitize(rctx.RenderMarkdown(text))) }, "isNil": func(t any) bool { // returns false for other "zero" values return t == nil }, "list": func(args ...any) []any { return args }, "dict": func(values ...any) (map[string]any, error) { if len(values)%2 != 0 { return nil, errors.New("invalid dict call") } dict := make(map[string]any, len(values)/2) for i := 0; i < len(values); i += 2 { key, ok := values[i].(string) if !ok { return nil, errors.New("dict keys must be strings") } dict[key] = values[i+1] } return dict, nil }, "deref": func(v any) any { val := reflect.ValueOf(v) if val.Kind() == reflect.Ptr && !val.IsNil() { return val.Elem().Interface() } return nil }, "i": func(name string, classes ...string) template.HTML { data, err := icon(name, classes) if err != nil { log.Printf("icon %s does not exist", name) data, _ = icon("airplay", classes) } return template.HTML(data) }, "cssContentHash": CssContentHash, "fileTree": filetree.FileTree, "pathUnescape": func(s string) string { u, _ := url.PathUnescape(s) return u },
"tinyAvatar": p.tinyAvatar, }}
func (p *Pages) tinyAvatar(handle string) string { handle = strings.TrimPrefix(handle, "@") secret := p.avatar.SharedSecret h := hmac.New(sha256.New, []byte(secret)) h.Write([]byte(handle)) signature := hex.EncodeToString(h.Sum(nil)) return fmt.Sprintf("%s/%s/%s?size=tiny", p.avatar.Host, signature, handle)}
func icon(name string, classes []string) (template.HTML, error) { iconPath := filepath.Join("static", "icons", name)
if filepath.Ext(name) == "" { iconPath += ".svg" }
data, err := Files.ReadFile(iconPath) if err != nil { return "", fmt.Errorf("icon %s not found: %w", name, err) }
// Convert SVG data to string svgStr := string(data)
svgTagEnd := strings.Index(svgStr, ">") if svgTagEnd == -1 { return "", fmt.Errorf("invalid SVG format for icon %s", name) }
classTag := ` class="` + strings.Join(classes, " ") + `"`
modifiedSVG := svgStr[:svgTagEnd] + classTag + svgStr[svgTagEnd:] return template.HTML(modifiedSVG), nil}