From 90b1ea230db9132d7ef455ea3b395733c12206e1 Mon Sep 17 00:00:00 2001
From: w0rp <devw0rp@gmail.com>
Date: Tue, 28 May 2019 20:27:10 +0100
Subject: [PATCH] Fix #2438 - Print a friendly message when the clipboard is
 not available

---
 autoload/ale/debugging.vim            |  6 ++++++
 test/test_ale_info_to_clipboard.vader | 15 +++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 test/test_ale_info_to_clipboard.vader

diff --git a/autoload/ale/debugging.vim b/autoload/ale/debugging.vim
index e4bf5e7e..7cdbabaa 100644
--- a/autoload/ale/debugging.vim
+++ b/autoload/ale/debugging.vim
@@ -238,6 +238,12 @@ function! ale#debugging#Info() abort
 endfunction
 
 function! ale#debugging#InfoToClipboard() abort
+    if !has('clipboard')
+        call s:Echo('clipboard not available. Try :ALEInfoToFile instead.')
+
+        return
+    endif
+
     redir => l:output
         silent call ale#debugging#Info()
     redir END
diff --git a/test/test_ale_info_to_clipboard.vader b/test/test_ale_info_to_clipboard.vader
new file mode 100644
index 00000000..2014a310
--- /dev/null
+++ b/test/test_ale_info_to_clipboard.vader
@@ -0,0 +1,15 @@
+After:
+  unlet! g:output
+
+Execute(ALEInfoToClipboard should that clipboard support is required):
+  " When run in the Docker image, there's no clipboard support, so this test
+  " will actually run.
+  if !has('clipboard')
+    let g:output = ''
+
+    redir => g:output
+      :ALEInfoToClipboard
+    redir END
+
+    AssertEqual 'clipboard not available. Try :ALEInfoToFile instead.', join(split(g:output))
+  endif