From f2be2ead352cab90718d73638f11aa8e4b070ca9 Mon Sep 17 00:00:00 2001
From: Jesse Bona <37656694+jessebona@users.noreply.github.com>
Date: Sat, 2 Feb 2019 10:34:53 +1100
Subject: [PATCH] Update migrate_config.py

Corrected loop condition to not run if configuration file only contains new lines.
---
 pre_commit/commands/migrate_config.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/pre_commit/commands/migrate_config.py b/pre_commit/commands/migrate_config.py
index 47bb7695..bac42319 100644
--- a/pre_commit/commands/migrate_config.py
+++ b/pre_commit/commands/migrate_config.py
@@ -22,9 +22,8 @@ def _migrate_map(contents):
     lines = contents.splitlines(True)
     i = 0
     # Only loop on non empty configuration file
-    if i < len(lines):
-        while _is_header_line(lines[i]):
-            i += 1
+    while i < len(lines) and _is_header_line(lines[i]):
+        i += 1
 
     header = ''.join(lines[:i])
     rest = ''.join(lines[i:])