ci: add shellcheck workflow, install/uninstall scripts

.github/workflows/shellcheck.yml

@@ -0,0 +1,23 @@
+name: ShellCheck
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install ShellCheck
+        run: sudo apt-get install -y shellcheck
+
+      - name: Run ShellCheck on all hooks
+        run: |
+          shellcheck pre-commit commit-msg pre-push post-checkout post-commit post-merge

README.md

@@ -39,42 +39,39 @@ a couple of annoying blunders:
 
 ## Installation
 
-### Quick Install
+### Quick Install (recommended)
 
 ```bash
 git clone https://github.com/taigrr/hooks.git ~/.git-hooks
-git config --global core.hooksPath ~/.git-hooks
+cd ~/.git-hooks && ./install.sh
+```
+
+This sets `core.hooksPath` so **all** repos use these hooks. Updates to the
+hooks directory apply everywhere immediately.
+
+To override hooks for a specific repo:
+
+```bash
+cd /path/to/repo
+git config core.hooksPath /path/to/other/hooks
 ```
 
 ### Template Installation
 
-Use this if you want new repos to get a *copy* of the hooks at clone/init time:
+Use this if you only want **new** repos (created with `git init` or `git clone`)
+to receive a copy of these hooks:
 
 ```bash
 git clone https://github.com/taigrr/hooks.git ~/.git-hooks
-git config --global init.templatedir ~/.git-hooks
+cd ~/.git-hooks && ./install.sh --template
 ```
 
-> **Note:** Existing repos won't be affected — only newly cloned or initialized repos
-> will receive the hooks.
+> **Note:** Existing repos won't be affected.
 
-### Central Management Installation
-
-Use this if you want *all* repos (existing and new) to use the same hooks directory:
+### Uninstall
 
 ```bash
-git clone https://github.com/taigrr/hooks.git ~/.git-hooks
-git config --global core.hooksPath ~/.git-hooks
-```
-
-This has the benefit of updating the hooks for all repos when you make a change,
-instead of only new repos going forward, but will require you to specify manual
-overrides for individual repos with customized hooks:
-
-```bash
-# Override for a specific repo
-cd /path/to/repo
-git config core.hooksPath /path/to/other/hooks
+cd ~/.git-hooks && ./uninstall.sh
 ```
 
 ## Configuration

install.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Install git hooks globally via core.hooksPath.
+# Usage: ./install.sh [--template]
+#   --template  Use init.templateDir instead (only affects new repos)
+
+set -euo pipefail
+
+hook_dir="$(cd "$(dirname "$0")" && pwd)"
+
+if [ "${1:-}" = "--template" ]; then
+	git config --global init.templateDir "$hook_dir"
+	echo "Installed: init.templateDir set to $hook_dir"
+	echo "New repos created with git init/clone will copy these hooks."
+else
+	git config --global core.hooksPath "$hook_dir"
+	echo "Installed: core.hooksPath set to $hook_dir"
+	echo "All repos will use hooks from $hook_dir."
+fi

uninstall.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Remove global git hooks configuration set by install.sh.
+
+set -euo pipefail
+
+if git config --global --get core.hooksPath > /dev/null 2>&1; then
+	git config --global --unset core.hooksPath
+	echo "Removed core.hooksPath"
+elif git config --global --get init.templateDir > /dev/null 2>&1; then
+	git config --global --unset init.templateDir
+	echo "Removed init.templateDir"
+else
+	echo "No global hooks configuration found."
+	exit 0
+fi
+
+echo "Global hooks configuration cleared."