build: add pre-commit hook template

.pre-commit

@@ -0,0 +1,11 @@
+#!/bin/sh
+FILES=$(git diff --cached --name-only --diff-filter=ACMR | sed 's| |\\ |g')
+[ -z "$FILES" ] && exit 0
+
+# Prettify all selected files
+echo "$FILES" | xargs keep-sorted
+
+# Add back the modified files to staging
+echo "$FILES" | xargs git add
+
+exit 0

README.md

@@ -1 +1,11 @@
-# dots
+# dots
+## build
+### `keep-sorted` pre-commit hook
+copy the pre-commit hook to `.git/hooks`
+```bash
+cp .pre-commit .git/hooks/pre-commit
+```
+make it executable
+```bash
+chmod +x .git/hooks/pre-commit
+```