Only run against modified shell files

.github/workflows/shellcheck.yml

@@ -0,0 +1,14 @@
+on: [push]
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Install ShellCheck
+      run: sudo apt-get install -y shellcheck
+
+    - name: Run ShellCheck
+      run: shellcheck $(awk -F'=' '/^source=/{print $2}' .shellcheckrc)

.shellcheckrc

@@ -0,0 +1,2 @@
+source=dev-mode.sh
+source=update_shellcheckrc.sh

dev-mode.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+touch ./.git/hooks/pre-commit
+
+chmod +x ./.git/hooks/pre-commit
+
+echo "#!/bin/bash" >./.git/hooks/pre-commit
+echo "bash ./update_shellcheckrc.sh" >>./.git/hooks/pre-commit

update_shellcheckrc.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Get the list of modified shell files
+MODIFIED_FILES=$(git diff --name-only master | grep -E '\.sh$' || true)
+
+# Update the .shellcheckrc file
+if [ -n "$MODIFIED_FILES" ]; then
+  # Remove previous entries
+  sed -i '/^source=.*$/d' .shellcheckrc
+  for file in $MODIFIED_FILES; do
+    echo "source=$file" >>.shellcheckrc
+  done
+
+  # Add .shellcheckrc to the staging
+  echo "Adding .shellcheck to the staging."
+  git add .shellcheckrc
+else
+  echo "No modified shell files to check."
+fi