From c39e5f82cc55ae8ecfe23ce7333228e3103f8e47 Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Wed, 28 Sep 2016 22:00:53 +0200
Subject: [PATCH] check for existence of git/hg before calling them

---
 autoload/airline/extensions/branch.vim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/autoload/airline/extensions/branch.vim b/autoload/airline/extensions/branch.vim
index a6c38da8..353dce85 100644
--- a/autoload/airline/extensions/branch.vim
+++ b/autoload/airline/extensions/branch.vim
@@ -71,7 +71,7 @@ function! s:get_git_branch(path)
 endfunction
 
 function! s:get_git_untracked(file)
-  if empty(a:file)
+  if empty(a:file) || !executable('git')
     return
   endif
   if !has_key(s:untracked_git, a:file)
@@ -88,7 +88,7 @@ function! s:get_git_untracked(file)
 endfunction
 
 function! s:get_hg_untracked(file)
-  if !s:has_lawrencium && empty(a:file)
+  if !s:has_lawrencium || empty(a:file) || !executable('hg')
     return
   endif
   " delete cache when unlet b:airline head?