Add tag count listing tool

_tools/stats-analyzer/index.js

@@ -0,0 +1,49 @@
+// stats-analyzer for dogwood
+
+import fs from 'fs';
+import graymatter from 'gray-matter';
+
+import process from 'process';
+import minimist from 'minimist';
+const argv = minimist(process.argv.slice(2));
+let sourcePath = process.env.npm_config_srcdir || argv.srcdir || '.';
+if (sourcePath.endsWith('/')) sourcePath.slice(0, -1);
+
+var tagCounts = {};
+
+function collectFileStats(json) {
+  for (var i in json.tags || []) {
+    var tag = json.tags[i];
+    if (!tagCounts[tag]) tagCounts[tag] = 0;
+    tagCounts[tag] += 1;
+  }
+}
+
+function collectStats(path) {
+  const dir = fs.opendirSync(path);
+  let dirent;
+  while ((dirent = dir.readSync()) !== null) {
+    const subpath = path + '/' + dirent.name;
+    if (dirent.isFile()) {
+      const filedata = fs.readFileSync(subpath);
+      const info = graymatter(filedata);
+
+      // ignore files not in Jekyll format
+      if (Object.keys(info.data).length > 0) {
+        // parse to string and back again to make sure dates are in string format
+        let data = JSON.parse(JSON.stringify(info.data));
+        collectFileStats(data);
+      }
+    } else if (dirent.isDirectory()) {
+      collectStats(subpath);
+    }
+  }
+  dir.closeSync();
+}
+
+collectStats(sourcePath + '/_posts');
+
+let tags = Object.keys(tagCounts).sort();
+tags.forEach(function(tag) {
+  console.log(tagCounts[tag] + ' ' + tag);
+});

package.json

@@ -6,6 +6,7 @@
         "cache:embedded": "node ./_tools/embedded-page-cacher/index.js --srcdir=.",
         "cache:images": "node ./_tools/image-cacher/index.js --srcdir=.",
         "cache": "npm-run-all -p cache:*",
+        "stats": "node ./_tools/stats-analyzer/index.js --srcdir=.",
         "thumbnails": "node ./_tools/thumbnail-generator/index.js --srcdir=.",
         "validate:frontmatter": "node ./_tools/frontmatter-validator/index.js --srcdir=.",
         "validate:people": "node ./_tools/people-validator/index.js --srcdir=.",