1 files changed, 123 insertions, 0 deletions
diff --git a/docs/theme/Source.js b/docs/theme/Source.js
new file mode 100644
index 0000000..e627460
--- /dev/null
+++ b/docs/theme/Source.js
@@ -0,0 +1,123 @@
+const ATTR_FACT = "data-fact";
+const CLASS_FACTS = "cd-source__facts";
+const CLASS_FACTS_VISIBLE = `${CLASS_FACTS}--visible`;
+
+document.addEventListener("DOMContentLoaded", function () {
+  document.querySelectorAll('[data-component="Source"]').forEach(showFacts);
+});
+
+function showFacts(node) {
+  function renderFacts(facts) {
+    Array.from(node.querySelectorAll(`[${ATTR_FACT}]`))
+    .forEach(function(node) {
+      const name = node.getAttribute(ATTR_FACT);
+      if (facts[name]) {
+        node.removeAttribute("hidden");
+        node.innerText = facts[name];
+      }
+    });
+
+    node.querySelector(`.${CLASS_FACTS}`).classList.add(CLASS_FACTS_VISIBLE);
+  }
+
+  getSourceFacts(node.href, renderFacts);
+}
+
+function getSourceFacts(url, callback) {
+  const key = `Source:${url}`;
+  let facts = sessionStorage.getItem(key);
+  if (facts) {
+    callback(JSON.parse(facts));
+    return;
+  }
+
+  fetchSourceFacts(url)
+  .then((facts) => {
+    if (facts && Object.keys(facts).length) {
+      sessionStorage.setItem(key, JSON.stringify(facts));
+      callback(facts);
+    }
+  });
+}
+
+function fetchJSON(url) {
+  return fetch(url)
+    .then(response => response.json())
+    .catch((error) => {
+      console.log(error);
+    });
+}
+
+function fetchSourceFacts(url) {
+  /* Try to match GitHub repository */
+  let match = url.match(/^.+github\.com\/([^/]+)\/?([^/]+)?/i);
+  if (match) {
+    const [, user, repo] = match;
+    return fetchSourceFactsFromGitHub(user, repo);
+  }
+
+  /* Try to match GitLab repository */
+  match = url.match(/^.+?([^/]*gitlab[^/]+)\/(.+?)\/?$/i);
+  if (match) {
+    const [, base, slug] = match;
+    return fetchSourceFactsFromGitLab(base, slug);
+  }
+
+  /* Fallback */
+  return null;
+}
+
+function fetchSourceFactsFromGitLab(base, project) {
+  const url = `https://${base}/api/v4/projects/${encodeURIComponent(project)}`
+
+  fetchJSON(url)
+  .then(function({ star_count, forks_count }) {
+    return {
+      stars: star_count,
+      forks: forks_count,
+    };
+  });
+}
+
+function fetchSourceFactsFromGitHub (user, repo) {
+  if (typeof repo === "undefined") {
+    return fetchSourceFactsFromGitHubOrg(user);
+  } else {
+    return fetchSourceFactsFromGitHubRepo(user, repo);
+  }
+}
+
+function fetchSourceFactsFromGitHubOrg(user) {
+  const url = `https://api.github.com/users/${user}`
+
+  fetchJSON(url)
+  .then(function(data) {
+    return {
+      numrepos: data.public_repos,
+    };
+  });
+}
+
+function fetchSourceFactsFromGitHubRepo(user, repo) {
+  const url = `https://api.github.com/repos/${user}/${repo}`
+
+  const release = fetchJSON(`${url}/releases/latest`)
+  .then((data) => {
+    return {
+      version: data.tag_name,
+    };
+  });
+
+  const info = fetchJSON(url)
+  .then((data) => {
+    return {
+      stars: data.stargazers_count,
+      forks: data.forks_count,
+    };
+  });
+
+  return Promise.all([release, info])
+  .then(([release, info]) => {
+    return { ...release, ...info };
+  });
+}