add possibility to register showdown extensions

.github/workflows/ehtml.yml

@@ -26,12 +26,20 @@ jobs:
     - run: npm run build
 
   release:
-    if: github.event_name == 'push'
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     needs: build
     steps:
       - uses: actions/checkout@v3
+      - name: Check commit message format
+        id: check_commit
+        run: |
+          if [[ "${{ github.event.head_commit.message }}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo "commit_message_format=valid" >> $GITHUB_ENV
+          else
+            echo "commit_message_format=invalid" >> $GITHUB_ENV
       - name: Create GitHub Release
+        if: env.commit_message_format == 'valid'
         uses: actions/create-release@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

src/E/e-markdown.js

@@ -15,7 +15,7 @@ if (!LIGHT_VERSION) {
 }
 
 module.exports = (node) => {
-  const extensions = []
+  const extensions = window.__ehtmlShowdownExtensions__ || []
   if (node.getAttribute('data-apply-code-highlighting') && showdownHighlight) {
     extensions.push(
       showdownHighlight({

src/main.js

@@ -1,10 +1,12 @@
 const observeNodeWithItsChildNodes = require('./observeNodeWithItsChildNodes')
 const turnEhtmlMutationObserverOn = require('./turnEhtmlMutationObserverOn')
 const turnEhtmlMutationObserverOff = require('./turnEhtmlMutationObserverOff')
+const registerShowdownExtension = require('./registerShowdownExtension')
 require('./actions/exports')
 
 window.__ehtmlState__ = window.__ehtmlState__ || {}
 window.__ehtmlCustomElements__ = window.__ehtmlCustomElements__ || {}
+window.__ehtmlShowdownExtensions__ = window.__ehtmlShowdownExtensions__ || []
 
 window.ehtmlMutationObserver = new MutationObserver(
   (mutationsList, observer) => {
@@ -25,3 +27,4 @@ turnEhtmlMutationObserverOn(
 
 window.turnEhtmlMutationObserverOn = turnEhtmlMutationObserverOn
 window.turnEhtmlMutationObserverOff = turnEhtmlMutationObserverOff
+window.registerShowdownExtension = registerShowdownExtension

src/registerShowdownExtension.js

@@ -0,0 +1,6 @@
+const showdown = require('showdown')
+
+module.exports = function(name, extensionFunction) {
+  const customShowdownExtension = showdown.extension(name, extensionFunction)
+  window.__ehtmlShowdownExtensions__.push(name)
+}