From d0aa9cb542252341a58bf988025a0546ae6db8bc Mon Sep 17 00:00:00 2001
From: Noah Gorny <noah@gittabags.com>
Date: Thu, 22 Apr 2021 01:38:11 +0300
Subject: [PATCH] hooks: Add check-clean-files-txt.sh

---
 .pre-commit-config.yaml        |  5 +++++
 hooks/check-clean-files-txt.sh | 35 ++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100755 hooks/check-clean-files-txt.sh

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c549d178..6b682bae 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -43,3 +43,8 @@ repos:
         language: system
         files: "\\.bash$"
         types: [file]
+      - id: clean-files-txt
+        name: Check that clean_files.txt is sorted alphabetically.
+        entry: ./hooks/check-clean-files-txt.sh
+        language: system
+        files: clean_files.txt
diff --git a/hooks/check-clean-files-txt.sh b/hooks/check-clean-files-txt.sh
new file mode 100755
index 00000000..e9a76d8f
--- /dev/null
+++ b/hooks/check-clean-files-txt.sh
@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+file=$1
+# Should only be run on clean_files.txt
+if [ "$file" != "clean_files.txt" ]; then
+	echo "Please run this script on clean_files.txt only!"
+	exit 1
+fi
+
+function compare_lines() {
+	prev=""
+	while read -r line; do
+		# Skip unimportant lines
+		[[ $line =~ "#" ]] && continue
+		[[ $line == "" ]] && continue
+		# Actual check
+		if [[ $prev > $line ]]; then
+			echo "$line should be before $prev"
+			exit 1
+		fi
+		prev=$line
+	done <<< "$1"
+}
+
+# Test root files
+compare_lines "$(grep -v "/" "$file")"
+
+# Test root directory
+compare_lines "$(grep "/$" "$file")"
+
+# Test non root directories
+compare_lines "$(grep "/." "$file")"
+
+# Yay, all good!
+exit 0