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Monorepo for Tangled forked from tangled.org/core
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Go
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import ( "bytes" "context" "crypto/hmac" "crypto/sha256" "encoding/hex" "errors" "fmt" "html" "html/template" "log" "math" "net/url" "path/filepath" "reflect" "strings" "time"
"github.com/alecthomas/chroma/v2" chromahtml "github.com/alecthomas/chroma/v2/formatters/html" "github.com/alecthomas/chroma/v2/lexers" "github.com/alecthomas/chroma/v2/styles" "github.com/bluesky-social/indigo/atproto/syntax" "github.com/dustin/go-humanize" "github.com/go-enry/go-enry/v2" "github.com/yuin/goldmark" "tangled.org/core/appview/filetree" "tangled.org/core/appview/pages/markup" "tangled.org/core/crypto")
func (p *Pages) funcMap() template.FuncMap { return template.FuncMap{ "split": func(s string) []string { return strings.Split(s, "\n") }, "trimPrefix": func(s, prefix string) string { return strings.TrimPrefix(s, prefix) }, "join": func(elems []string, sep string) string { return strings.Join(elems, sep) }, "contains": func(s string, target string) bool { return strings.Contains(s, target) }, "stripPort": func(hostname string) string { if strings.Contains(hostname, ":") { return strings.Split(hostname, ":")[0] } return hostname }, "mapContains": func(m any, key any) bool { mapValue := reflect.ValueOf(m) if mapValue.Kind() != reflect.Map { return false } keyValue := reflect.ValueOf(key) return mapValue.MapIndex(keyValue).IsValid() }, "resolve": func(s string) string { identity, err := p.resolver.ResolveIdent(context.Background(), s)
if err != nil { return s }
if identity.Handle.IsInvalidHandle() { return "handle.invalid" }
return identity.Handle.String() }, "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) }, "string": func(v any) string { return fmt.Sprint(v) }, "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 }, "mul": func(a, b int) int { return a * b }, "div": func(a, b int) int { return a / b }, "mod": 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 any, 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 != "" && handle != syntax.HandleInvalid.String() { return 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 }, "commaFmt": humanize.Comma, "relTimeFmt": humanize.Time, "shortRelTimeFmt": func(t time.Time) string { return humanize.CustomRelTime(t, time.Now(), "", "", []humanize.RelTimeMagnitude{ {D: time.Second, Format: "now", DivBy: time.Second}, {D: 2 * time.Second, Format: "1s %s", DivBy: 1}, {D: time.Minute, Format: "%ds %s", DivBy: time.Second}, {D: 2 * time.Minute, Format: "1min %s", DivBy: 1}, {D: time.Hour, Format: "%dmin %s", DivBy: time.Minute}, {D: 2 * time.Hour, Format: "1hr %s", DivBy: 1}, {D: humanize.Day, Format: "%dhrs %s", DivBy: time.Hour}, {D: 2 * humanize.Day, Format: "1d %s", DivBy: 1}, {D: 20 * humanize.Day, Format: "%dd %s", DivBy: humanize.Day}, {D: 8 * humanize.Week, Format: "%dw %s", DivBy: humanize.Week}, {D: humanize.Year, Format: "%dmo %s", DivBy: humanize.Month}, {D: 18 * humanize.Month, Format: "1y %s", DivBy: 1}, {D: 2 * humanize.Year, Format: "2y %s", DivBy: 1}, {D: humanize.LongTime, Format: "%dy %s", DivBy: humanize.Year}, {D: math.MaxInt64, Format: "a long while %s", DivBy: 1}, }) }, "longTimeFmt": func(t time.Time) string { return t.Format("Jan 2, 2006, 3:04 PM MST") }, "iso8601DateTimeFmt": func(t time.Time) string { return t.Format("2006-01-02T15:04:05-07:00") }, "iso8601DurationFmt": 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)) return fmt.Sprintf("P%dD%dH%dM%dS", days, hours, minutes, seconds) }, "durationFmt": func(duration time.Duration) string { return durationFmt(duration, [4]string{"d", "hr", "min", "s"}) }, "longDurationFmt": func(duration time.Duration) string { return durationFmt(duration, [4]string{"days", "hours", "minutes", "seconds"}) }, "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.ReplaceAll(template.HTMLEscapeString(text), "\n", "<br>")) }, "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())).Interface() }, "markdown": func(text string) template.HTML { p.rctx.RendererType = markup.RendererTypeDefault htmlString := p.rctx.RenderMarkdown(text) sanitized := p.rctx.SanitizeDefault(htmlString) return template.HTML(sanitized) }, "description": func(text string) template.HTML { p.rctx.RendererType = markup.RendererTypeDefault htmlString := p.rctx.RenderMarkdownWith(text, goldmark.New()) sanitized := p.rctx.SanitizeDescription(htmlString) return template.HTML(sanitized) }, "readme": func(text string) template.HTML { p.rctx.RendererType = markup.RendererTypeRepoMarkdown htmlString := p.rctx.RenderMarkdown(text) sanitized := p.rctx.SanitizeDefault(htmlString) return template.HTML(sanitized) }, "code": func(content, path string) string { var style *chroma.Style = styles.Get("catpuccin-latte") formatter := chromahtml.New( chromahtml.InlineCode(false), chromahtml.WithLineNumbers(true), chromahtml.WithLinkableLineNumbers(true, "L"), chromahtml.Standalone(false), chromahtml.WithClasses(true), )
lexer := lexers.Get(filepath.Base(path)) if lexer == nil { lexer = lexers.Fallback }
iterator, err := lexer.Tokenise(nil, content) if err != nil { p.logger.Error("chroma tokenize", "err", "err") return "" }
var code bytes.Buffer err = formatter.Format(&code, style, iterator) if err != nil { p.logger.Error("chroma format", "err", "err") return "" }
return code.String() }, "trimUriScheme": func(text string) string { text = strings.TrimPrefix(text, "https://") text = strings.TrimPrefix(text, "http://") return 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 := p.icon(name, classes) if err != nil { log.Printf("icon %s does not exist", name) data, _ = p.icon("airplay", classes) } return template.HTML(data) }, "cssContentHash": p.CssContentHash, "fileTree": filetree.FileTree, "pathEscape": func(s string) string { return url.PathEscape(s) }, "pathUnescape": func(s string) string { u, _ := url.PathUnescape(s) return u }, "safeUrl": func(s string) template.URL { return template.URL(s) }, "tinyAvatar": func(handle string) string { return p.AvatarUrl(handle, "tiny") }, "fullAvatar": func(handle string) string { return p.AvatarUrl(handle, "") }, "langColor": enry.GetColor, "layoutSide": func() string { return "col-span-1 md:col-span-2 lg:col-span-3" }, "layoutCenter": func() string { return "col-span-1 md:col-span-8 lg:col-span-6" },
"normalizeForHtmlId": func(s string) string { normalized := strings.ReplaceAll(s, ":", "_") normalized = strings.ReplaceAll(normalized, ".", "_") return normalized }, "sshFingerprint": func(pubKey string) string { fp, err := crypto.SSHFingerprint(pubKey) if err != nil { return "error" } return fp }, }}
func (p *Pages) AvatarUrl(handle, size 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))
sizeArg := "" if size != "" { sizeArg = fmt.Sprintf("size=%s", size) } return fmt.Sprintf("%s/%s/%s?%s", p.avatar.Host, signature, handle, sizeArg)}
func (p *Pages) 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}
func durationFmt(duration time.Duration, names [4]string) 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 }{ {names[0], days}, {names[1], hours}, {names[2], minutes}, {names[3], 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, " ")}