loader: warn when links.json parses fail instead of silently using example

- Project card: optional `repo` field renders a git icon corner link
  (github.com / bitbucket.org / Gitea URLs supported).
- All cards: `.card__title` and `.card__desc` are now display:block, so
  the description always starts on its own line.
- Added data/links.schema.json (JSON Schema 2020-12) describing the
  full content model. Both data files reference it via `$schema` for
  github.dev / VS Code autocomplete.
- New GitHub Action validates data/links.json on every push/PR:
  jq syntax check + ajv-cli schema validation.

.github/workflows/validate-data.yml

@@ -0,0 +1,37 @@
+name: Validate links data
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "data/links.example.json"
+      - "data/links.schema.json"
+      - ".github/workflows/validate-data.yml"
+  pull_request:
+    paths:
+      - "data/links.example.json"
+      - "data/links.schema.json"
+      - ".github/workflows/validate-data.yml"
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: JSON syntax (jq)
+        run: |
+          set -e
+          # data/links.json is gitignored (personal content); only validate what's tracked.
+          for f in data/links.example.json data/links.schema.json; do
+            echo "Checking $f"
+            jq empty "$f"
+          done
+
+      - name: Schema validation (ajv)
+        run: |
+          npx --yes ajv-cli@5 validate \
+            --spec=draft2020 \
+            --strict=false \
+            -s data/links.schema.json \
+            -d data/links.example.json

README.md

@@ -187,6 +187,7 @@ Bigger, prose-friendly card with tags.
   "type": "card",
   "title": "CoVote",
   "url": "https://covote.org",
+  "repo": "https://github.com/covote/covote",  // optional — adds a git icon in the corner
   "description": "Anonymous election platform for co-ops.",
   "tags": ["democracy", "co-ops"],
   "featured": true                             // optional — makes it the hero card
@@ -196,7 +197,8 @@ Bigger, prose-friendly card with tags.
 | field         | required? | notes |
 |---------------|-----------|-------|
 | `title`       | yes       | Serif headline (Fraunces in editorial; Archivo 900 caps in Swiss). |
-| `url`         | no        | If present, the card becomes a link. |
+| `url`         | no        | If present, the title becomes a link. |
+| `repo`        | no        | Optional secondary link to the project's source repository. Renders a small git icon in the top-right corner. Supports `github.com`, `bitbucket.org`, and Gitea/self-hosted URLs. When set, the card is no longer wrapped in a single anchor — the title is the primary link, the icon is the secondary. |
 | `description` | no        | Paragraph under the title. |
 | `tags`        | no        | Array of strings — small monospaced chips. |
 | `featured`    | no        | When `true`, card spans 8/12 columns AND fills with the accent color (paper text on vermilion). Use sparingly — one per section. |

assets/css/styles.css

@@ -345,8 +345,8 @@ main > .section:first-child { margin-top: var(--space-3xl); }
 .card--link .favicon img { width: 100%; height: 100%; object-fit: cover; }
 .card--link .favicon img.is-favicon { width: 44px; height: 44px; object-fit: contain; }
 .card--link .favicon[data-fallback] { font-family: var(--display); font-weight: 500; font-size: 1.7rem; color: var(--ink); }
-.card__title { font-weight: 540; letter-spacing: -0.005em; line-height: 1.25; }
-.card__desc  { color: var(--muted); font-size: var(--fs-sm); }
+.card__title { display: block; font-weight: 540; letter-spacing: -0.005em; line-height: 1.25; }
+.card__desc  { display: block; color: var(--muted); font-size: var(--fs-sm); }
 .card__host  { font-family: var(--mono); font-size: var(--fs-mini); color: var(--muted); text-transform: lowercase; }
 .card__meta  { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.4rem 0.8rem; margin-top: 0.2rem; }
 .card__date  { font-family: var(--mono); font-size: var(--fs-mini); color: var(--muted); letter-spacing: 0.02em; text-transform: uppercase; }
@@ -365,6 +365,35 @@ main > .section:first-child { margin-top: var(--space-3xl); }
   letter-spacing: -0.02em;
   line-height: 1.05;
 }
+.card__title--link { color: inherit; text-decoration: none; }
+.card__title--link:hover { color: var(--accent); }
+
+/* optional repo link (github/bitbucket/gitea) */
+.card--has-repo::after { content: none; }
+.card__repo {
+  position: absolute;
+  top: 1rem;
+  right: 1rem;
+  width: 32px;
+  height: 32px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 8px;
+  color: currentColor;
+  opacity: 0.55;
+  transition: opacity 180ms var(--ease), background-color 180ms var(--ease), color 180ms var(--ease), transform 220ms var(--ease-strong);
+  z-index: 2;
+}
+.card__repo svg { width: 18px; height: 18px; display: block; }
+.card__repo:hover {
+  opacity: 1;
+  color: var(--accent);
+  background: color-mix(in oklch, var(--accent) 10%, transparent);
+  transform: translateY(-1px);
+}
+.card--featured .card__repo { color: color-mix(in oklch, var(--on-accent) 75%, transparent); opacity: 0.85; top: 1.25rem; right: 1.5rem; }
+.card--featured .card__repo:hover { color: var(--on-accent); background: color-mix(in oklch, var(--on-accent) 16%, transparent); }
 
 /* FEATURED — accent-filled hero card */
 .card--featured {
@@ -711,6 +740,13 @@ main > .section:first-child { margin-top: var(--space-3xl); }
   line-height: 1;
 }
 .foot__right { text-align: right; }
+.foot__edit {
+  margin-left: 0.6em;
+  color: var(--muted);
+  border-bottom: 1px dotted color-mix(in oklch, var(--muted) 50%, transparent);
+  transition: color 180ms var(--ease), border-color 180ms var(--ease);
+}
+.foot__edit:hover { color: var(--accent); border-bottom-color: var(--accent); }
 
 /* reveal */
 .reveal { opacity: 0; transform: translateY(16px); transition: opacity 700ms var(--ease-strong), transform 700ms var(--ease-strong); }

assets/js/app.js

@@ -48,9 +48,23 @@
 
   function renderProject(it) {
     const featured = it.featured ? " card--featured" : "";
+    const tags = (it.tags || []).map(t => `<span class="tag">${esc(t)}</span>`).join("");
+    const repo = repoLinkMarkup(it.repo);
+
+    if (repo) {
+      const titleTag = it.url ? "a" : "span";
+      const titleAttrs = it.url ? `href="${esc(it.url)}" target="_blank" rel="noopener noreferrer"` : "";
+      return `
+        <div class="card card--project${featured} card--has-repo reveal">
+          ${repo}
+          <${titleTag} class="card__title card__title--link" ${titleAttrs}>${esc(it.title)}</${titleTag}>
+          ${it.description ? `<p class="card__desc">${esc(it.description)}</p>` : ""}
+          ${(tags || it.date) ? `<div class="tags">${tags}${dateMarkup(it)}</div>` : ""}
+        </div>`;
+    }
+
     const tag = it.url ? "a" : "div";
     const attrs = it.url ? `href="${esc(it.url)}" target="_blank" rel="noopener noreferrer"` : "";
-    const tags = (it.tags || []).map(t => `<span class="tag">${esc(t)}</span>`).join("");
     return `
       <${tag} class="card card--project${featured} reveal" ${attrs}>
         <span class="card__title">${esc(it.title)}</span>
@@ -59,6 +73,26 @@
       </${tag}>`;
   }
 
+  function repoKind(url) {
+    const h = hostOf(url).toLowerCase();
+    if (!h) return null;
+    if (h === "github.com" || h.endsWith(".github.com")) return "github";
+    if (h === "bitbucket.org" || h.endsWith(".bitbucket.org")) return "bitbucket";
+    return "gitea";
+  }
+
+  function repoLinkMarkup(url) {
+    if (!url) return "";
+    const kind = repoKind(url);
+    if (!kind) return "";
+    const host = hostOf(url);
+    const label = kind === "github" ? "View source on GitHub"
+                : kind === "bitbucket" ? "View source on Bitbucket"
+                : `View source (${host})`;
+    const icon = `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="6" cy="6" r="2"/><circle cx="6" cy="18" r="2"/><circle cx="18" cy="6" r="2"/><path d="M6 8v8"/><path d="M18 8a4 4 0 0 1-4 4H6"/></svg>`;
+    return `<a class="card__repo" href="${esc(url)}" target="_blank" rel="noopener noreferrer" title="${esc(label)}" aria-label="${esc(label)}" data-repo-kind="${kind}">${icon}</a>`;
+  }
+
   function renderYouTube(it) {
     const wide = it.featured ? " card--wide" : "";
     return `
@@ -678,7 +712,15 @@
       try {
         const res = await fetch(src, { cache: "no-cache" });
         if (!res.ok) { lastErr = new Error(`${src}: HTTP ${res.status}`); continue; }
+        try {
           return await res.json();
+        } catch (parseErr) {
+          // File loaded but JSON is malformed — surface this loudly instead of
+          // silently falling back to the next source.
+          console.warn(`[dlstack] ${src} loaded but failed to parse — falling back. Fix the JSON to see your content.`, parseErr);
+          lastErr = new Error(`${src}: invalid JSON — ${parseErr.message}`);
+          continue;
+        }
       } catch (err) { lastErr = err; }
     }
     throw lastErr || new Error("No data file found.");
@@ -736,7 +778,7 @@
       <main>${sections.map((s, i) => renderSection(s, i + 1)).join("")}</main>
 
       <footer class="foot">
-        <span>${esc(data.footer?.copy || "")}</span>
+        <span>${esc(data.footer?.copy || "")}${data.footer?.editUrl ? ` <a class="foot__edit" href="${esc(data.footer.editUrl)}" target="_blank" rel="noopener noreferrer" title="Edit this site's content on GitHub">Edit on GitHub ↗</a>` : ""}</span>
         <span class="foot__mark" aria-hidden="true">— ✱ —</span>
         <span class="foot__right">© ${new Date().getFullYear()} ${esc(p.name || "")}</span>
       </footer>

data/links.example.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "./links.schema.json",
   "profile": {
     "name": "Ada Lovelace",
     "handle": "@ada",
@@ -39,6 +40,7 @@
           "type": "card",
           "title": "Bernoulli Numbers",
           "url": "https://example.com/projects/bernoulli",
+          "repo": "https://github.com/example/bernoulli",
           "description": "Method for computing Bernoulli numbers using the Engine.",
           "tags": ["mathematics"],
           "date": "1843-07"

data/links.schema.json

@@ -0,0 +1,193 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://dlstack/links.schema.json",
+  "title": "dlstack links file",
+  "description": "Content document for a dlstack site. Lives at data/links.json and is fetched at runtime by assets/js/app.js.",
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["profile", "sections"],
+  "properties": {
+    "$schema": { "type": "string", "description": "Reference to this schema for editor autocomplete." },
+
+    "profile": {
+      "type": "object",
+      "description": "Hero block at the top of the page.",
+      "additionalProperties": true,
+      "required": ["name"],
+      "properties": {
+        "name":     { "type": "string" },
+        "handle":   { "type": "string" },
+        "tagline":  { "type": "string" },
+        "bio":      { "type": "string" },
+        "location": { "type": "string" },
+        "avatar":   { "type": "string", "description": "Optional avatar image URL." }
+      }
+    },
+
+    "theme": {
+      "type": "object",
+      "additionalProperties": true,
+      "properties": {
+        "accent":   { "type": "string", "description": "Accent color (CSS color, usually hex)." },
+        "template": { "type": "string", "enum": ["editorial", "swiss", "cosmos"] }
+      }
+    },
+
+    "sections": {
+      "type": "array",
+      "description": "Ordered list of content sections.",
+      "items": { "$ref": "#/$defs/section" }
+    },
+
+    "social": {
+      "type": "array",
+      "description": "Pill buttons under the hero bio.",
+      "items": { "$ref": "#/$defs/social" }
+    },
+
+    "footer": {
+      "type": "object",
+      "additionalProperties": true,
+      "properties": {
+        "copy":    { "type": "string", "description": "Left-aligned footer line." },
+        "year":    { "type": "string", "description": "'auto' to use current year, or a fixed string." },
+        "editUrl": { "type": "string", "format": "uri", "description": "Optional 'Edit on GitHub' link, e.g. https://github.com/you/repo/edit/main/data/links.json. When set, an unobtrusive link appears in the footer." }
+      }
+    }
+  },
+
+  "$defs": {
+    "section": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["id", "label", "items"],
+      "properties": {
+        "id":       { "type": "string" },
+        "label":    { "type": "string" },
+        "kicker":   { "type": "string", "description": "Small line above the section label." },
+        "layout":   { "type": "string", "enum": ["clients", "testimonials"], "description": "Special layout. Omit for the default bento grid." },
+        "headless": { "type": "boolean", "description": "Render section body without the header — useful for chaining a continuation onto the previous section." },
+        "items":    { "type": "array", "items": { "$ref": "#/$defs/item" } }
+      }
+    },
+
+    "item": {
+      "oneOf": [
+        { "$ref": "#/$defs/itemLink" },
+        { "$ref": "#/$defs/itemCard" },
+        { "$ref": "#/$defs/itemYouTube" },
+        { "$ref": "#/$defs/itemPortfolio" },
+        { "$ref": "#/$defs/itemClient" },
+        { "$ref": "#/$defs/itemTestimonial" }
+      ]
+    },
+
+    "date": {
+      "type": "string",
+      "description": "Optional date. Accepts ISO 'YYYY', 'YYYY-MM', 'YYYY-MM-DD', or free-form strings like '1837'.",
+      "pattern": "^.+$"
+    },
+
+    "itemLink": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["type", "title", "url"],
+      "properties": {
+        "type":        { "const": "link" },
+        "title":       { "type": "string" },
+        "url":         { "type": "string", "format": "uri-reference" },
+        "description": { "type": "string" },
+        "image":       { "type": "string", "description": "Custom logo URL. Overrides the auto-fetched favicon." },
+        "icon":        { "type": "string", "description": "Alias for 'image'." },
+        "featured":    { "type": "boolean" },
+        "date":        { "$ref": "#/$defs/date" }
+      }
+    },
+
+    "itemCard": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["type", "title"],
+      "properties": {
+        "type":        { "const": "card" },
+        "title":       { "type": "string" },
+        "url":         { "type": "string", "format": "uri-reference", "description": "Primary link. When present, the title becomes a link." },
+        "repo":        { "type": "string", "format": "uri", "description": "Optional secondary link to the project's source repo. Renders a git icon in the corner. Supports github.com, bitbucket.org, and Gitea/self-hosted URLs." },
+        "description": { "type": "string" },
+        "tags":        { "type": "array", "items": { "type": "string" } },
+        "featured":    { "type": "boolean", "description": "Hero card — spans 8/12 columns, fills with accent color." },
+        "date":        { "$ref": "#/$defs/date" }
+      }
+    },
+
+    "itemYouTube": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["type", "id", "title"],
+      "properties": {
+        "type":     { "const": "youtube" },
+        "id":       { "type": "string", "description": "YouTube video ID (the 11-char string after v=)." },
+        "title":    { "type": "string" },
+        "featured": { "type": "boolean", "description": "When true, card spans the wider layout." },
+        "date":     { "$ref": "#/$defs/date" }
+      }
+    },
+
+    "itemPortfolio": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["type", "image"],
+      "properties": {
+        "type":        { "const": "portfolio" },
+        "image":       { "type": "string" },
+        "title":       { "type": "string" },
+        "description": { "type": "string" },
+        "url":         { "type": "string", "format": "uri-reference" },
+        "ratio":       { "type": "string", "pattern": "^\\d+\\s*:\\s*\\d+$", "description": "Aspect ratio as 'W:H' (e.g. '16:9', '5:2'). Default '5:2'." },
+        "date":        { "$ref": "#/$defs/date" }
+      }
+    },
+
+    "itemClient": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["type", "title"],
+      "properties": {
+        "type":  { "const": "client" },
+        "title": { "type": "string" },
+        "url":   { "type": "string", "format": "uri-reference" },
+        "image": { "type": "string" },
+        "icon":  { "type": "string", "description": "Alias for 'image'." },
+        "date":  { "$ref": "#/$defs/date" }
+      }
+    },
+
+    "itemTestimonial": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["type", "quote"],
+      "properties": {
+        "type":  { "const": "testimonial" },
+        "quote": { "type": "string" },
+        "name":  { "type": "string" },
+        "role":  { "type": "string" },
+        "org":   { "type": "string" },
+        "url":   { "type": "string", "format": "uri-reference" },
+        "image": { "type": "string" },
+        "icon":  { "type": "string", "description": "Alias for 'image'." },
+        "date":  { "$ref": "#/$defs/date" }
+      }
+    },
+
+    "social": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["label", "url"],
+      "properties": {
+        "label": { "type": "string" },
+        "url":   { "type": "string", "format": "uri-reference" },
+        "icon":  { "type": "string", "description": "Icon key (e.g. 'github', 'linkedin', 'mail', 'rss')." }
+      }
+    }
+  }
+}