Allow warnings about trailing blank lines to be hidden for flake8 and pycodestyle

ale_linters/python/flake8.vim

@@ -91,6 +91,12 @@ function! ale_linters#python#flake8#Handle(buffer, lines) abort
             continue
         endif
 
+        if l:code is# 'W391'
+        \&& !ale#Var(a:buffer, 'warn_about_trailing_blank_lines')
+            " Skip warnings for trailing blank lines if the option is off
+            continue
+        endif
+
         let l:item = {
         \   'lnum': l:match[1] + 0,
         \   'col': l:match[2] + 0,

ale_linters/python/pycodestyle.vim

@@ -23,6 +23,12 @@ function! ale_linters#python#pycodestyle#Handle(buffer, lines) abort
     " lines are formatted as follows:
     " file.py:21:26: W291 trailing whitespace
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        if l:match[4] is# 'W391'
+        \&& !ale#Var(a:buffer, 'warn_about_trailing_blank_lines')
+            " Skip warnings for trailing blank lines if the option is off
+            continue
+        endif
+
         let l:item = {
         \   'lnum': l:match[2] + 0,
         \   'col': l:match[3] + 0,

doc/ale.txt

@@ -1387,6 +1387,18 @@ b:ale_virtualenv_dir_names                         *b:ale_virtualenv_dir_names*
   directory containing the Python file to find virtualenv paths.
 
 
+g:ale_warn_about_trailing_blank_lines   *g:ale_warn_about_trailing_blank_lines*
+b:ale_warn_about_trailing_blank_lines   *b:ale_warn_about_trailing_blank_lines*
+
+  Type: |Number|
+  Default: `1`
+
+  When this option is set to `1`, warnings about trailing blank lines will be
+  shown.
+
+  This option behaves similarly to |g:ale_warn_about_trailing_whitespace|.
+
+
 g:ale_warn_about_trailing_whitespace     *g:ale_warn_about_trailing_whitespace*
 b:ale_warn_about_trailing_whitespace     *b:ale_warn_about_trailing_whitespace*
 
@@ -1394,10 +1406,9 @@ b:ale_warn_about_trailing_whitespace     *b:ale_warn_about_trailing_whitespace*
   Default: `1`
 
   When this option is set to `1`, warnings relating to trailing whitespace on
-  lines will be shown in signs, the loclist, and echo messages, etc. If these
-  errors are found to be too irritating while edits are being made, and you
-  have configured Vim to automatically remove trailing whitespace, then you
-  can disable these warnings for some linters by setting this option to `0`.
+  lines will be shown. If warnings are too irritating while editing buffers,
+  and you have configured Vim to automatically remove trailing whitespace,
+  you can disable these warnings by setting this option to `0`.
 
   Not all linters may respect this option. If a linter does not, please file a
   bug report, and it may be possible to add such support.

plugin/ale.vim

@@ -175,8 +175,9 @@ let g:ale_statusline_format = get(g:, 'ale_statusline_format',
 \)
 
 " This flag can be set to 0 to disable warnings for trailing whitespace
-let g:ale_warn_about_trailing_whitespace =
-\   get(g:, 'ale_warn_about_trailing_whitespace', 1)
+call ale#Set('warn_about_trailing_whitespace', 1)
+" This flag can be set to 0 to disable warnings for trailing blank lines
+call ale#Set('warn_about_trailing_blank_lines', 1)
 
 " A flag for controlling the maximum size of the command history to store.
 let g:ale_max_buffer_history_size = get(g:, 'ale_max_buffer_history_size', 20)

test/handler/test_flake8_handler.vader

@@ -1,8 +1,16 @@
 Before:
-    runtime ale_linters/python/flake8.vim
+  Save g:ale_warn_about_trailing_blank_lines
+
+  let g:ale_warn_about_trailing_blank_lines = 1
+
+  runtime ale_linters/python/flake8.vim
 
 After:
-    call ale#linter#Reset()
+  Restore
+
+  unlet! b:ale_warn_about_trailing_blank_lines
+
+  call ale#linter#Reset()
 
 Execute(The flake8 handler should handle basic warnings and syntax errors):
   AssertEqual
@@ -126,7 +134,7 @@ Execute(The flake8 handler should handle stack traces):
   \   'ImportError: No module named parser',
   \ ])
 
-Execute (The flake8 handler should handle names with spaces):
+Execute(The flake8 handler should handle names with spaces):
   AssertEqual
   \ [
   \   {
@@ -141,3 +149,29 @@ Execute (The flake8 handler should handle names with spaces):
   \ ale_linters#python#flake8#Handle(42, [
   \   'C:\something\with spaces.py:6:6: E111 indentation is not a multiple of four',
   \ ])
+
+Execute(Warnings about trailing blank lines should be reported by default):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 6,
+  \     'col': 1,
+  \     'code': 'W391',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': 'blank line at end of file',
+  \   },
+  \ ],
+  \ ale_linters#python#flake8#Handle(bufnr(''), [
+  \   'foo.py:6:1: W391 blank line at end of file',
+  \ ])
+
+Execute(Disabling trailing blank line warnings should work):
+  let b:ale_warn_about_trailing_blank_lines = 0
+
+  AssertEqual
+  \ [
+  \ ],
+  \ ale_linters#python#flake8#Handle(bufnr(''), [
+  \   'foo.py:6:1: W391 blank line at end of file',
+  \ ])

test/handler/test_pycodestyle_handler.vader

@@ -1,7 +1,15 @@
 Before:
+  Save g:ale_warn_about_trailing_blank_lines
+
+  let g:ale_warn_about_trailing_blank_lines = 1
+
   runtime ale_linters/python/pycodestyle.vim
 
 After:
+  Restore
+
+  unlet! b:ale_warn_about_trailing_blank_lines
+
   call ale#linter#Reset()
   silent file something_else.py
 
@@ -64,3 +72,29 @@ Execute(The pycodestyle handler should parse output):
   \   'stdin:222:34: W602 deprecated form of raising exception',
   \   'example.py:544:21: W601 .has_key() is deprecated, use ''in''',
   \ ])
+
+Execute(Warnings about trailing blank lines should be reported by default):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 6,
+  \     'col': 1,
+  \     'code': 'W391',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': 'blank line at end of file',
+  \   },
+  \ ],
+  \ ale_linters#python#pycodestyle#Handle(bufnr(''), [
+  \   'foo.py:6:1: W391 blank line at end of file',
+  \ ])
+
+Execute(Disabling trailing blank line warnings should work):
+  let b:ale_warn_about_trailing_blank_lines = 0
+
+  AssertEqual
+  \ [
+  \ ],
+  \ ale_linters#python#pycodestyle#Handle(bufnr(''), [
+  \   'foo.py:6:1: W391 blank line at end of file',
+  \ ])