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internal/core/funcs.go
8d1bb5bfdd2cba82488775b46308efed740132a8
· 3.8 KB · 137 lines
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| 1 | package core |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "html/template" |
| 6 | "strings" |
| 7 | "time" |
| 8 | ) |
| 9 | |
| 10 | // FuncMap is bound to a single Ctx at render time. `mod` is the only |
| 11 | // entry point a template needs; everything else is sugar. |
| 12 | func FuncMap(c *Ctx) template.FuncMap { |
| 13 | return template.FuncMap{ |
| 14 | // mod runs a module. A template that calls it is what *causes* |
| 15 | // the work -- views that don't ask, don't pay. |
| 16 | "mod": func(name string, args ...string) (any, error) { |
| 17 | return c.Mod(name, args...) |
| 18 | }, |
| 19 | // modOr swallows the error, for optional modules (no README, etc). |
| 20 | "modOr": func(name string, args ...string) any { |
| 21 | v, err := c.Mod(name, args...) |
| 22 | if err != nil { |
| 23 | return nil |
| 24 | } |
| 25 | return v |
| 26 | }, |
| 27 | "has": func(name string) bool { |
| 28 | v, err := c.Mod(name) |
| 29 | return err == nil && v != nil |
| 30 | }, |
| 31 | "url": func(parts ...string) string { |
| 32 | return "/" + strings.Trim(strings.Join(parts, "/"), "/") |
| 33 | }, |
| 34 | // static builds a cache-busting asset URL, e.g. "css/base.css" -> |
| 35 | // "/static/css/base.css?v=<tag>". The `v` param is what lets |
| 36 | // main.go's static handler hand out a year-long immutable |
| 37 | // Cache-Control instead of a short one -- a URL without it is |
| 38 | // still served, just not frozen for a year. |
| 39 | "static": func(p string) string { |
| 40 | return "/static/" + p + "?v=" + c.StaticTag |
| 41 | }, |
| 42 | "dict": dict, |
| 43 | "date": func(t time.Time) string { |
| 44 | if t.IsZero() { |
| 45 | return "" |
| 46 | } |
| 47 | return t.Format("2006-01-02 15:04") |
| 48 | }, |
| 49 | "rfc3339": func(t time.Time) string { return t.Format(time.RFC3339) }, |
| 50 | "trunc": func(n int, s string) string { |
| 51 | if len(s) <= n { |
| 52 | return s |
| 53 | } |
| 54 | return s[:n] + "…" |
| 55 | }, |
| 56 | "bytes": humanBytes, |
| 57 | "patch": renderPatch, |
| 58 | "slug": slugify, |
| 59 | "bytes64": func(n int) string { return humanBytes(int64(n)) }, |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | // slugify makes a section name usable as a fragment id. |
| 64 | func slugify(s string) string { |
| 65 | var b strings.Builder |
| 66 | prevDash := false |
| 67 | for _, r := range strings.ToLower(s) { |
| 68 | switch { |
| 69 | case (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9'): |
| 70 | b.WriteRune(r) |
| 71 | prevDash = false |
| 72 | case !prevDash && b.Len() > 0: |
| 73 | b.WriteByte('-') |
| 74 | prevDash = true |
| 75 | } |
| 76 | } |
| 77 | return strings.TrimRight(b.String(), "-") |
| 78 | } |
| 79 | |
| 80 | // renderPatch tags each diff line so the stylesheet can colour it. Doing |
| 81 | // this here rather than in CSS lets the gutter carry the signal instead of |
| 82 | // flooding whole rows with green and red. |
| 83 | func renderPatch(p string) template.HTML { |
| 84 | var b strings.Builder |
| 85 | b.WriteString(`<div class="patch">`) |
| 86 | for _, ln := range strings.Split(strings.TrimRight(p, "\n"), "\n") { |
| 87 | cls := "ctx" |
| 88 | switch { |
| 89 | case strings.HasPrefix(ln, "+++"), strings.HasPrefix(ln, "---"), |
| 90 | strings.HasPrefix(ln, "diff "), strings.HasPrefix(ln, "index "), |
| 91 | strings.HasPrefix(ln, "new file"), strings.HasPrefix(ln, "deleted file"), |
| 92 | strings.HasPrefix(ln, "similarity"), strings.HasPrefix(ln, "rename "): |
| 93 | cls = "meta" |
| 94 | case strings.HasPrefix(ln, "@@"): |
| 95 | cls = "hunk" |
| 96 | case strings.HasPrefix(ln, "+"): |
| 97 | cls = "add" |
| 98 | case strings.HasPrefix(ln, "-"): |
| 99 | cls = "del" |
| 100 | } |
| 101 | b.WriteString(`<div class="pl ` + cls + `">`) |
| 102 | b.WriteString(template.HTMLEscapeString(ln)) |
| 103 | b.WriteString("</div>") |
| 104 | } |
| 105 | b.WriteString(`</div>`) |
| 106 | return template.HTML(b.String()) |
| 107 | } |
| 108 | |
| 109 | // dict builds a map for passing named args to partials, mirroring Hugo's |
| 110 | // dict so shared partials stay portable later. |
| 111 | func dict(kv ...any) (map[string]any, error) { |
| 112 | if len(kv)%2 != 0 { |
| 113 | return nil, fmt.Errorf("dict: odd number of arguments") |
| 114 | } |
| 115 | m := make(map[string]any, len(kv)/2) |
| 116 | for i := 0; i < len(kv); i += 2 { |
| 117 | k, ok := kv[i].(string) |
| 118 | if !ok { |
| 119 | return nil, fmt.Errorf("dict: key %d is not a string", i) |
| 120 | } |
| 121 | m[k] = kv[i+1] |
| 122 | } |
| 123 | return m, nil |
| 124 | } |
| 125 | |
| 126 | func humanBytes(n int64) string { |
| 127 | const unit = 1024 |
| 128 | if n < unit { |
| 129 | return fmt.Sprintf("%d B", n) |
| 130 | } |
| 131 | div, exp := int64(unit), 0 |
| 132 | for x := n / unit; x >= unit; x /= unit { |
| 133 | div *= unit |
| 134 | exp++ |
| 135 | } |
| 136 | return fmt.Sprintf("%.1f %cB", float64(n)/float64(div), "KMGT"[exp]) |
| 137 | } |