From cd2aaf04f91c1b21f2bf0617d323c9d427bc571c Mon Sep 17 00:00:00 2001
From: Nick Chambers <uplime@spookyinternet.com>
Date: Sun, 25 Jul 2021 20:39:04 -0500
Subject: [PATCH] bash/pre-commit: git hook to lint files before committing

---
 bash/pre-commit | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100755 bash/pre-commit

diff --git a/bash/pre-commit b/bash/pre-commit
new file mode 100755
index 0000000..058d039
--- /dev/null
+++ b/bash/pre-commit
@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+has() {
+  if (( $# )); then
+    hash "$1" 2>/dev/null
+  fi
+}
+
+is_a() {
+  if (( $# > 1 )); then
+    head -1 "$1" | grep -qE '^#!.*'"$2"'$'
+  fi
+}
+
+find . -name .DS_Store -exec rm -f -- {} +
+
+git status -zu | while read -rd '' xy filename; do
+  if [[ $xy = "??" || $xy = D ]]; then
+    continue
+  fi
+
+  if [[ $filename = *.sh ]] || is_a "$filename" bash; then
+    if has shellcheck; then
+      shellcheck -s bash "$filename"
+    fi
+  elif [[ $filename = *.rb ]] || is_a "$filename" ruby; then
+    if has rubocop; then
+      rubocop -c "$(git rev-parse --show-toplevel)" "$filename"
+    fi
+  fi
+done