Update JS library (jquery & mathjax) using GitHub action (#11454)

* update js library (jquery & mathjax)
* restore file mode, change paths in conf.js
* use variable for paths and replacement strings
* check if path exists or not for replacement

.github/workflows/update_js_libs.yml

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+name: Update JS Library
+
+on:
+  workflow_dispatch:
+
+jobs:
+  update_js_libs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: 'Update js libs'
+        id: vars
+        run: |
+
+          # create a new branch and checkout on local
+          git branch update-js-libs
+          git checkout update-js-libs
+
+          # make executable
+          chmod +x ./tools/update-js-libs.sh
+          ./tools/update-js-libs.sh
+
+          # commit changes
+          git config --global user.name github-actions
+          git config --global user.email github-actions@github.com
+          git add .
+          git commit -am "updated mathjax and jquery"
+          git push --set-upstream origin update-js-libs -f
+
+          # get installed jquery and mathjax version
+          cd ~/tmp/anki
+          jquery_ver=$(npm list jquery | grep -Po "jquery@(\d+\.)+\d+" | sort -u)
+          mathjax_ver=$(npm list mathjax | grep -Po "mathjax@(\d+\.)+\d+")
+
+          # setting an output parameter
+          echo ::set-output name=jquery_ver::"$jquery_ver"
+          echo ::set-output name=mathjax_ver::"$mathjax_ver"
+
+      - name: 'Create pull request'
+        uses: actions/github-script@v6
+        with:
+          script: |
+            try {
+              await github.rest.pulls.create({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                head: 'update-js-libs',
+                base: 'main',
+                title: 'Update jquery and mathjax',
+                body: "### Updated\n ${{ steps.vars.outputs.jquery_ver }} \n ${{ steps.vars.outputs.mathjax_ver }}"
+              });
+            } catch(err) {
+              if (err.status === 422) {
+                console.log("PR already exists.")
+              } else {
+                throw err;
+              }
+            }

tools/update-js-libs.sh

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+# update mathjax and jquery js library with Anki Desktop
+
+# path variable
+ANKI_SRC=~/tmp/anki
+ANKIDROID_SRC=/home/runner/work/Anki-Android/Anki-Android
+
+# ensure some basic tools are installed
+sudo apt install bash grep findutils curl gcc g++ git
+
+# install bazelisk
+curl -L https://github.com/bazelbuild/bazelisk/releases/download/v1.10.1/bazelisk-linux-amd64 -o ./bazel
+chmod +x bazel && sudo mv bazel /usr/local/bin/
+
+# clone Anki
+git clone https://github.com/ankitects/anki $ANKI_SRC
+
+# build for mathjax and jquery
+cd $ANKI_SRC/qt/aqt/data/web/js/vendor
+bazel build vendor
+
+cd $ANKI_SRC/ts 
+bazel build mathjax
+
+# copy latest jquery to assets dir
+cp $ANKI_SRC/.bazel/bin/qt/aqt/data/web/js/vendor/jquery.min.js $ANKIDROID_SRC/AnkiDroid/src/main/assets/jquery.min.js
+
+# remove old mathjax file
+rm -rf $ANKIDROID_SRC/AnkiDroid/src/main/assets/mathjax/*
+
+# copy latest mathjax to assets dir
+cp -r $ANKI_SRC/.bazel/bin/qt/aqt/data/web/js/vendor/mathjax $ANKIDROID_SRC/AnkiDroid/src/main/assets/
+
+cp $ANKI_SRC/.bazel/bin/ts/mathjax/index.js $ANKIDROID_SRC/AnkiDroid/src/main/assets/mathjax/conf.js
+
+# replace paths in conf.js for AnkiDroid
+ANKI_MATHJAX_DIR="_anki/js/vendor/mathjax"
+ANKIDROID_MATHJAX_DIR="android_asset/mathjax"
+MATHJAX_CONF_JS=$ANKIDROID_SRC/AnkiDroid/src/main/assets/mathjax/conf.js
+
+# check if the path exists in conf.js file or not, otherwise exit
+if grep "$ANKI_MATHJAX_DIR" $MATHJAX_CONF_JS
+then
+    sed -i "s|$ANKI_MATHJAX_DIR|$ANKIDROID_MATHJAX_DIR|" $MATHJAX_CONF_JS
+else
+    echo "MathJax path does not exist in conf.js file, it is changed"
+    exit 1
+fi
+
+# cleanup
+rm $ANKIDROID_SRC/AnkiDroid/src/main/assets/mathjax/mathjax-cp.sh
+
+# restore mathjax.css file
+cd $ANKIDROID_SRC
+git restore AnkiDroid/src/main/assets/mathjax/mathjax.css
+
+# change mode of files in assets dir
+find $ANKIDROID_SRC/AnkiDroid/src/main/assets/mathjax/ -type f -print0 | xargs -0 chmod 644