mmdflux 2.1.0

Render Mermaid diagrams as Unicode text, ASCII, SVG, and MMDS JSON.
Documentation 
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#!/usr/bin/env bash
# Generate a side-by-side before/after gallery of changed SVG snapshots.
#
# Usage:
#   scripts/svg-gallery-diff              # diff against main
#   scripts/svg-gallery-diff <base-ref>   # diff against any ref
#   scripts/svg-gallery-diff --no-open    # don't auto-open browser

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"

BASE_REF="main"
AUTO_OPEN=1

while [[ $# -gt 0 ]]; do
  case "$1" in
    --no-open) AUTO_OPEN=0; shift ;;
    --base) BASE_REF="$2"; shift 2 ;;
    -*) printf 'Unknown flag: %s\n' "$1" >&2; exit 1 ;;
    *) BASE_REF="$1"; shift ;;
  esac
done

OUT_DIR="$REPO_ROOT/scripts/out/svg-diff-$(date +%Y%m%d-%H%M%S)"
mkdir -p "$OUT_DIR/before" "$OUT_DIR/after"

# Collect changed SVG snapshots
CHANGED=()
while IFS= read -r line; do
  [[ -n "$line" ]] && CHANGED+=("$line")
done < <(
  git -C "$REPO_ROOT" diff "$BASE_REF" --name-only -- tests/svg-snapshots/ \
    | grep '\.svg$' \
    | sort
)

if [[ ${#CHANGED[@]} -eq 0 ]]; then
  printf 'No changed SVG snapshots vs %s.\n' "$BASE_REF"
  exit 0
fi

n_files="${#CHANGED[@]}"
printf '%d changed SVG snapshots vs %s\n\n' "$n_files" "$BASE_REF"

# Extract before/after versions and build a manifest
MANIFEST_FILE="$(mktemp)"
trap 'rm -f "$MANIFEST_FILE"' EXIT

for relpath in "${CHANGED[@]}"; do
  slug="${relpath#tests/svg-snapshots/}"
  dir="$(dirname "$slug")"
  name="$(basename "$slug" .svg)"
  file_slug="$(echo "$slug" | tr '/' '__')"

  # Derive preset label from directory
  case "$dir" in
    flowchart)            preset="default (basis)" ;;
    flowchart-*)          preset="${dir#flowchart-}" ;;
    class)                preset="class" ;;
    *)                    preset="$dir" ;;
  esac

  # Copy after version
  if [[ -f "$REPO_ROOT/$relpath" ]]; then
    cp "$REPO_ROOT/$relpath" "$OUT_DIR/after/$file_slug"
  fi

  # Extract before version (may not exist for new files)
  has_before=0
  if git -C "$REPO_ROOT" show "$BASE_REF:$relpath" >"$OUT_DIR/before/$file_slug" 2>/dev/null; then
    has_before=1
  else
    rm -f "$OUT_DIR/before/$file_slug"
  fi

  # Append to manifest: fixture_name|preset|file_slug|has_before
  printf '%s|%s|%s|%d\n' "$name" "$preset" "$file_slug" "$has_before" >> "$MANIFEST_FILE"
done

# Get sorted unique fixture names
FIXTURE_NAMES="$(cut -d'|' -f1 "$MANIFEST_FILE" | sort -u)"
n_fixtures="$(echo "$FIXTURE_NAMES" | wc -l | tr -d ' ')"

# --- Generate HTML ---

GALLERY_HTML="$OUT_DIR/gallery.html"

cat > "$GALLERY_HTML" <<'HTML_HEAD'
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>SVG Snapshot Diff</title>
  <style>
    :root { --bg: #0b1020; --fg: #e8ebf3; --muted: #98a1b3;
            --card: #141a2b; --border: #2a334c; --new: #065f4622; --new-b: #10b981; }
    * { box-sizing: border-box; }
    body { margin: 0; background: var(--bg); color: var(--fg);
           font: 14px/1.5 ui-sans-serif, -apple-system, Segoe UI, sans-serif; }
    header { padding: 16px 20px 12px; max-width: 1600px; margin: 0 auto; }
    h1 { margin: 0 0 4px; font-size: 22px; }
    .subtitle { color: var(--muted); margin: 0; font-size: 13px; }
    .controls { display: flex; gap: 10px; align-items: center;
                padding: 10px 20px; max-width: 1600px; margin: 0 auto;
                border-bottom: 1px solid var(--border); }
    .controls input[type=text] {
      background: #111827; color: var(--fg); border: 1px solid var(--border);
      border-radius: 8px; padding: 6px 10px; min-width: 240px; }
    .controls label { color: var(--muted); display: flex; align-items: center; gap: 4px;
                      cursor: pointer; user-select: none; font-size: 13px; }
    .count { color: var(--muted); font-size: 12px; margin-left: auto; }
    main { max-width: 1600px; margin: 0 auto; padding: 14px 20px; }
    .fixture { margin-bottom: 28px; }
    .fixture-name { font-family: ui-monospace, monospace; font-size: 16px;
                    font-weight: 600; margin: 0 0 10px; }
    .variants { display: flex; flex-direction: column; gap: 10px; }
    .variant { background: var(--card); border: 1px solid var(--border);
               border-radius: 10px; overflow: hidden; }
    .variant.is-new { border-color: var(--new-b); background: var(--new); }
    .variant-label { padding: 6px 10px; font-size: 12px; font-family: ui-monospace, monospace;
                     color: var(--muted); border-bottom: 1px solid var(--border);
                     display: flex; justify-content: space-between; align-items: center; }
    .variant-label .tag-new { color: var(--new-b); font-weight: 700; font-size: 10px;
                              text-transform: uppercase; letter-spacing: .4px; }
    .compare { display: grid; grid-template-columns: 1fr 1fr; }
    .compare.new-only { grid-template-columns: 1fr; }
    .side { line-height: 0; }
    .side-header { line-height: 1.5; padding: 4px 10px; font-size: 11px;
                   font-weight: 600; text-transform: uppercase; letter-spacing: .5px;
                   color: var(--muted); background: #0d1117; }
    .side-header.before { color: #f87171; }
    .side-header.after  { color: #34d399; }
    .side img { width: 100%; background: #fff; display: block; }
    .hidden { display: none !important; }
  </style>
</head>
<body>
<header>
  <h1>SVG Snapshot Diff</h1>
HTML_HEAD

printf '  <p class="subtitle">%d fixtures changed (%d SVG files) vs %s</p>\n' \
  "$n_fixtures" "$n_files" "$BASE_REF" >> "$GALLERY_HTML"

cat >> "$GALLERY_HTML" <<'HTML_CONTROLS'
</header>
<div class="controls">
  <input id="search" type="text" placeholder="Filter fixture name…" oninput="applyFilters()" />
  <label><input type="checkbox" id="collapse-presets" onchange="applyFilters()"> Show only default preset</label>
  <span class="count" id="count"></span>
</div>
<main id="main">
HTML_CONTROLS

# Emit cards grouped by fixture
echo "$FIXTURE_NAMES" | while IFS= read -r fixture; do
  printf '<div class="fixture" data-fixture="%s">\n' "$fixture" >> "$GALLERY_HTML"
  printf '  <h2 class="fixture-name">%s</h2>\n' "$fixture" >> "$GALLERY_HTML"
  printf '  <div class="variants">\n' >> "$GALLERY_HTML"

  grep "^${fixture}|" "$MANIFEST_FILE" | while IFS='|' read -r _name preset file_slug has_before; do
    is_new=""
    compare_class="compare"
    if [[ "$has_before" -eq 0 ]]; then
      is_new="is-new"
      compare_class="compare new-only"
    fi

    printf '    <div class="variant %s" data-preset="%s">\n' "$is_new" "$preset" >> "$GALLERY_HTML"
    printf '      <div class="variant-label">\n' >> "$GALLERY_HTML"
    printf '        <span>%s</span>\n' "$preset" >> "$GALLERY_HTML"
    if [[ -n "$is_new" ]]; then
      printf '        <span class="tag-new">new</span>\n' >> "$GALLERY_HTML"
    fi
    printf '      </div>\n' >> "$GALLERY_HTML"
    printf '      <div class="%s">\n' "$compare_class" >> "$GALLERY_HTML"

    if [[ "$has_before" -eq 1 ]]; then
      printf '        <div class="side">\n' >> "$GALLERY_HTML"
      printf '          <div class="side-header before">Before (%s)</div>\n' "$BASE_REF" >> "$GALLERY_HTML"
      printf '          <img src="before/%s" />\n' "$file_slug" >> "$GALLERY_HTML"
      printf '        </div>\n' >> "$GALLERY_HTML"
    fi

    printf '        <div class="side">\n' >> "$GALLERY_HTML"
    printf '          <div class="side-header after">After</div>\n' >> "$GALLERY_HTML"
    printf '          <img src="after/%s" />\n' "$file_slug" >> "$GALLERY_HTML"
    printf '        </div>\n' >> "$GALLERY_HTML"

    printf '      </div>\n    </div>\n' >> "$GALLERY_HTML"
  done

  printf '  </div>\n</div>\n' >> "$GALLERY_HTML"
done

cat >> "$GALLERY_HTML" <<HTML_FOOT
</main>
<script>
  const totalFixtures = $n_fixtures;

  function applyFilters() {
    const search = document.getElementById('search').value.trim().toLowerCase();
    const collapsePresets = document.getElementById('collapse-presets').checked;
    let visible = 0;

    document.querySelectorAll('.fixture').forEach(fix => {
      const name = fix.dataset.fixture;
      const matchesSearch = !search || name.includes(search);
      fix.classList.toggle('hidden', !matchesSearch);
      if (matchesSearch) visible++;

      if (collapsePresets) {
        fix.querySelectorAll('.variant').forEach(v => {
          const p = v.dataset.preset;
          const isDefault = p === 'default (basis)' || p === 'class';
          v.classList.toggle('hidden', !isDefault);
        });
      } else {
        fix.querySelectorAll('.variant').forEach(v => v.classList.remove('hidden'));
      }
    });

    document.getElementById('count').textContent = visible + ' / ' + totalFixtures + ' fixtures';
  }

  applyFilters();
</script>
</body>
</html>
HTML_FOOT

printf '\nGallery: %s\n' "$GALLERY_HTML"

if [[ $AUTO_OPEN -eq 1 ]]; then
  if command -v open &>/dev/null; then
    open "$GALLERY_HTML"
  elif command -v xdg-open &>/dev/null; then
    xdg-open "$GALLERY_HTML"
  fi
fi