Update conditional checks and add yadm pre_commit hook

.config/yadm/hooks/post_pull

@@ -0,0 +1,5 @@
+#!/usr/bin/env sh
+
+echo "Running post pull script..."
+
+autoinstall base

.config/yadm/hooks/pre_ci

@@ -0,0 +1 @@
+pre_commit

.config/yadm/hooks/pre_commit

@@ -0,0 +1,30 @@
+#!/usr/bin/env sh
+
+# Check encrypted files for newer versions
+files="$HOME/.config/yadm/encrypt"
+archive="$HOME/.local/share/yadm/archive"
+new_files=false
+
+echo "Checking for newer versions of encrypted files..."
+while IFS= read -r file
+do
+	if test "$HOME/$file" -nt "$archive"
+	then
+		echo "WARNING: ~/$file is newer than the archive!"
+		new_files=true
+	fi
+done < "$files"
+
+if $new_files
+then
+	echo "WARNING: There are newer versions of encrypted files!"
+	echo "WARNING: Please consider re-encrypting them."
+	printf "Continue? [y/N] "
+	read -r answer
+	if [ "$answer" = "n" ] || [ "$answer" = "N" ]
+	then
+		exit 1
+	fi
+else
+	echo "All encrypted files are up to date."
+fi