performance: don't create subshells

transcrypt

@@ -173,20 +173,17 @@ _list_encrypted_files() {
 	# List files with -z option to disable quoting of filenames, then
 	# immediately convert NUL-delimited filenames to be newline-delimited to be
 	# compatibility with bash variables
-	for file in $(git ls-files -z | tr '\0' '\n'); do
-		# Check for the suffix ': filter: crypt' that identifies encrypted file
-		local check
-		check=$(git check-attr filter "$file" 2>/dev/null)
-
-		# Only output names of encrypted files matching the context, either
-		# strictly (if $1 = "true") or loosely (if $1 is false or unset)
-		if [[ "$strict_context" == "true" ]] &&
-			[[ "$check" == *": filter: crypt${CONTEXT_CRYPT_SUFFIX:-}" ]]; then
-			echo "$file"
-		elif [[ "$check" == *": filter: crypt${CONTEXT_CRYPT_SUFFIX:-}"* ]]; then
-			echo "$file"
-		fi
-	done
+	git -c core.quotePath=false ls-files -z | tr '\0' '\n' |
+		git -c core.quotePath=false check-attr filter --stdin 2>/dev/null |
+		{
+			if [[ "$strict_context" == "true" ]]; then
+				grep ": filter: crypt${CONTEXT_CRYPT_SUFFIX:-}$" || true
+			else
+				grep ": filter: crypt${CONTEXT_CRYPT_SUFFIX:-}.*$" || true
+			fi
+		} |
+		sed "s|: filter: crypt${CONTEXT_CRYPT_SUFFIX:-}.*||" |
+		while read -r file; do eval "echo $file"; done
 }
 
 # Detect OpenSSL major version 3 or later which requires a compatibility