Actions (translations): Enforce that .pot and .po files are in sync

Author: hartwork

.github/workflows/translations.sh

@@ -0,0 +1,38 @@
+#! /usr/bin/env bash
+set -e -u -o pipefail
+
+restore_po_creation_date_from_git() {
+    local filename="${1}"
+    local original="$(git show "HEAD:./${filename}" 2>/dev/null | grep -nF POT-Creation-Date:)"
+    if [[ -z ${original} ]]; then
+        echo "[*] Skipped unversioned file \"${filename}\"."
+        return 0
+    fi
+    local line_number="${original%%:*}"
+    local line_content="${original#*:}"
+    {
+        sed -n "1,$(( line_number - 1 ))p" "${filename}"
+        echo "${line_content}"
+        sed -n "$(( line_number + 1 )),\$p" "${filename}"
+    } | sponge "${filename}"
+    echo "[+] Restored POT-Creation-Date for file \"${filename}\"."
+}
+
+gettext --version | head -n1
+
+echo '[*] Update existing .pot files...'
+for i in libvisual libvisual-plugins ; do
+    make -C "${i}"/po update-pot >/dev/null
+done
+
+echo '[*] Update existing .po files...'
+for i in libvisual libvisual-plugins ; do
+    make -C "${i}"/po update-po >/dev/null
+done
+
+echo '[*] Restoring creation date headers...'
+for i in */po/*.{po,pot}; do
+    restore_po_creation_date_from_git "${i}"
+done
+
+echo '[+] DONE.'

.github/workflows/translations.yml

@@ -0,0 +1,80 @@
+name: Enforce that .po/.pot files are in sync with the code
+
+on:
+  pull_request:
+  push:
+  schedule:
+    - cron: '0 3 * * 5'  # Every Friday at 3am
+
+env:
+  LV_INSTALL_PREFIX: /home/runner/.local/
+
+jobs:
+  translations:
+    name: Enforce that .po/.pot files are in sync with the code
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install build dependencies
+        run: |-
+          sudo apt-get update
+          # Note: This additional step's sole purpuse is to workaround symptom:
+          #       > The following packages have unmet dependencies:
+          #       >  libunwind-14-dev : Breaks: libunwind-dev but 1.3.2-2build2
+          #       >                             is to be installed
+          sudo apt-get install --yes --no-install-recommends libunwind-dev
+          sudo apt-get install --yes --no-install-recommends \
+            autopoint \
+            bison \
+            doxygen \
+            flex \
+            gettext \
+            graphviz \
+            libgstreamer1.0-dev \
+            libgtk2.0-dev \
+            libjack-dev \
+            libluajit-5.1-dev \
+            liborc-0.4-dev \
+            libpng-dev \
+            libasound2-dev \
+            libsdl1.2-dev \
+            libgl1-mesa-dev \
+            moreutils \
+            pkg-config
+
+      - name: Checkout Git branch
+        uses: actions/checkout@v3
+
+      - name: '[LV] Run autoreconf'
+        run: |-
+          for i in libvisual libvisual-plugins ; do
+            pushd ${i}
+              autoreconf --install --verbose --force
+            popd
+          done
+
+      - name: '[LV] Run "./configure" (from Git)'
+        run: |-
+          cd libvisual
+          ./configure \
+            --prefix ${LV_INSTALL_PREFIX} \
+
+      - name: '[LV] Run "make"'
+        run: |-
+          make -C libvisual -j2 VERBOSE=1
+
+      - name: '[LV] Run "make install"'
+        run: |-
+          make -C libvisual install
+          find ${LV_INSTALL_PREFIX} | sort
+
+      - name: '[Plugins] Run "./configure" (from Git)'
+        run: |-
+          cd libvisual-plugins
+          PKG_CONFIG_PATH=${LV_INSTALL_PREFIX}/lib/pkgconfig/ \
+            ./configure \
+              --disable-gstreamer-plugin \
+
+      - name: 'Enforce that .po/.pot files are in sync with the code'
+        run: |-
+          .github/workflows/translations.sh
+          git diff --exit-code  # i.e. fail CI with details if non-empty