From 3859ac0c9b17edd9776c5e9b42d0c13e4ee7eb42 Mon Sep 17 00:00:00 2001
From: Bailey Stoner <bailey@patreon.com>
Date: Tue, 10 Oct 2017 13:49:47 -0700
Subject: [PATCH 1/2] Use $VIRTUAL_ENV environment variable when present.

---
 autoload/ale/python.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/ale/python.vim b/autoload/ale/python.vim
index 4f14697..d788b77 100644
--- a/autoload/ale/python.vim
+++ b/autoload/ale/python.vim
@@ -71,7 +71,7 @@ function! ale#python#FindVirtualenv(buffer) abort
         endfor
     endfor
 
-    return ''
+    return $VIRTUAL_ENV
 endfunction
 
 " Run an executable check for Python scripts.

From 620ec32da15acaa0a395abb03dbcb47504a645fb Mon Sep 17 00:00:00 2001
From: Bailey Stoner <bailey@patreon.com>
Date: Wed, 11 Oct 2017 13:42:38 -0700
Subject: [PATCH 2/2] Add a test to ensure $VIRTUAL_ENV is respected.

---
 test/test_python_virtualenv.vader | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 test/test_python_virtualenv.vader

diff --git a/test/test_python_virtualenv.vader b/test/test_python_virtualenv.vader
new file mode 100644
index 0000000..b44c5fa
--- /dev/null
+++ b/test/test_python_virtualenv.vader
@@ -0,0 +1,12 @@
+Before:
+  Save $VIRTUAL_ENV
+  let $VIRTUAL_ENV = "/opt/example/"
+
+After:
+  Restore
+
+Execute(ale#python#FindVirtualenv falls back to $VIRTUAL_ENV when no directories match):
+  AssertEqual
+  \  ale#python#FindVirtualenv(bufnr('%')),
+  \  '/opt/example/',
+  \  'Expected VIRTUAL_ENV environment variable to be used, but it was not'