Add unit tests and refactor for testability

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Build
+        run: npm run build
+
+      - name: Check for uncommitted changes
+        run: |
+          if [ -n "$(git status --porcelain dist/)" ]; then
+            echo "Error: dist/ has uncommitted changes"
+            git diff dist/
+            exit 1
+          fi

action.yml

@@ -34,99 +34,8 @@ outputs:
     value: ${{ steps.generate.outputs.long-sha }}
 
 runs:
-  using: "composite"
-  steps:
-    - name: Generate release tag and create release
-      id: generate
-      uses: actions/github-script@v8
-      with:
-        github-token: ${{ inputs.github-token }}
-        script: |
-          const { data: { commit, sha } } = await github.rest.repos.getCommit({
-            ...context.repo,
-            ref: '${{ inputs.commit }}'
-          });
-
-          const commitDate = new Date(commit.committer.date);
-          const isoDate = commitDate.toISOString();
-
-          const pad = (n) => String(n).padStart(2, '0');
-          const year = commitDate.getUTCFullYear();
-          const month = commitDate.getUTCMonth() + 1;
-          const day = commitDate.getUTCDate();
-          const hour = commitDate.getUTCHours();
-          const minute = commitDate.getUTCMinutes();
-          const second = commitDate.getUTCSeconds();
-
-          const tokens = [
-            ['{YYYY}', year],
-            ['{YY}', String(year).slice(-2)],
-            ['{MM}', pad(month)],
-            ['{M}', month],
-            ['{DD}', pad(day)],
-            ['{D}', day],
-            ['{HH}', pad(hour)],
-            ['{H}', hour],
-            ['{mm}', pad(minute)],
-            ['{m}', minute],
-            ['{ss}', pad(second)],
-            ['{s}', second]
-          ];
-
-          let tag = '${{ inputs.tag-format }}';
-          tag = tag.replace(/\{sha:(\d+)\}/g, (_, len) => {
-            return sha.substring(0, parseInt(len));
-          });
-          tag = tag.replace(/\{sha\}/g, sha);
-          for (const [token, value] of tokens) {
-            tag = tag.replaceAll(token, value);
-          }
-
-          try {
-            await github.rest.repos.getReleaseByTag({
-              ...context.repo,
-              tag: tag
-            });
-            core.setFailed(
-              `Release with tag '${tag}' already exists.\n` +
-              `This means the commit has already been released.`
-            );
-            return;
-          } catch (error) {
-            if (error.status !== 404) {
-              throw error;
-            }
-          }
-
-          const releaseName = '${{ inputs.release-name }}'.replaceAll('{tag}', tag);
-
-          let releaseNotes = (await github.rest.repos.generateReleaseNotes({
-            ...context.repo,
-            tag_name: tag,
-            target_commitish: '${{ inputs.commit }}'
-          })).data.body || '';
-
-          // Need to truncate otherwise createRelease fails.
-          const maxLength = 124900;
-          if (releaseNotes.length > maxLength) {
-            releaseNotes = releaseNotes.substring(0, maxLength) +
-              '\n\n... (truncated)';
-          }
-
-          await github.rest.repos.createRelease({
-            ...context.repo,
-            tag_name: tag,
-            name: releaseName,
-            body: releaseNotes
-          });
-
-          const shortSha = sha.substring(0, 7);
-          core.setOutput('tag', tag);
-          core.setOutput('iso-date', isoDate);
-          core.setOutput('short-sha', shortSha);
-          core.setOutput('long-sha', sha);
-
-          core.info(`Created release '${releaseName}' with tag '${tag}'`);
+  using: "node20"
+  main: "dist/index.js"
 
 branding:
   icon: "tag"