Meta: add yet phrase checking using ESMeta

Author: jhnaldo

.github/workflows/esmeta-yetcheck.yml

@@ -0,0 +1,77 @@
+name: 'esmeta yet phrases detection'
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  esmeta-new-phrases:
+    runs-on: ubuntu-latest
+
+    env:
+      ESMETA_HOME: vendor/esmeta
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: Setup SBT
+        uses: sbt/setup-sbt@v1
+      - name: download esmeta
+        run: |
+          mkdir -p "${ESMETA_HOME}"
+          cd "${ESMETA_HOME}"
+          git init
+          git remote add origin https://github.com/es-meta/esmeta.git
+          git fetch --depth 1 origin bd58590ef6badabbe71afdefa02dc32274902621 ;# v0.7.1
+          git checkout FETCH_HEAD
+      - name: build esmeta
+        run: |
+          cd "${ESMETA_HOME}"
+          sbt assembly
+      - name: link
+        run: |
+          rmdir "${ESMETA_HOME}"/ecma262 \
+            && ln -s "$(pwd)" "${ESMETA_HOME}"/ecma262
+
+      - id: collect
+        name: List added line numbers
+        shell: bash
+        env:
+          FILE_PATH: spec.html
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.sha }}
+        run: |
+          # zero-context diff, limited to the file we care about
+          added_lines=$(git diff -U0 --no-color "${BASE_SHA}" "${HEAD_SHA}" -- "${FILE_PATH}" |
+          # keep only the hunk headers (the @@ lines)
+          awk '
+            # Example header: @@ -158,0 +159,2 @@
+            /^@@/ {
+              # Extract “+<start>[,<count>]” part
+              match($0, /\+([0-9]+)(,([0-9]+))?/, a)
+              start = a[1]
+              count = (a[3] == "" ? 1 : a[3])
+              # Print every line number in the added range
+              for (i = 0; i < count; i++) print start + i
+            }
+          ')
+
+          # Join line numbers with comma or space (whichever format you need)
+          added_joined=$(echo "$added_lines" | paste -sd "," -)
+          added_lines_json="[$added_joined]"
+
+          # Set it as an output value
+          echo "added_lines=$added_lines_json" >> "$GITHUB_OUTPUT"
+
+      - name: check newly introduces phrases
+        run: |
+          "${ESMETA_HOME}"/bin/esmeta extract \
+            -status \
+            -extract:warn-action <<< ${{ steps.collect.outputs.added_lines }}