Fix 1695 - Change rubocop fixer to use stdin (#3230)

* Fix 1695 - Change rubocop fixer to use stdin
* Update test_rubocop_fixer_callback.vader

Co-authored-by: Horacio Sanson <horacio@allm.inc>
Co-authored-by: w0rp <w0rp@users.noreply.github.com>

autoload/ale/fixers/rubocop.vim

@@ -2,6 +2,23 @@ call ale#Set('ruby_rubocop_options', '')
 call ale#Set('ruby_rubocop_auto_correct_all', 0)
 call ale#Set('ruby_rubocop_executable', 'rubocop')
 
+" Rubocop fixer outputs diagnostics first and then the fixed
+" output. These are delimited by a "=======" string that we
+" look for to remove everything before it.
+function! ale#fixers#rubocop#PostProcess(buffer, output) abort
+    let l:line = 0
+
+    for l:output in a:output
+        let l:line = l:line + 1
+
+        if l:output =~# "^=\\+$"
+            break
+        endif
+    endfor
+
+    return a:output[l:line :]
+endfunction
+
 function! ale#fixers#rubocop#GetCommand(buffer) abort
     let l:executable = ale#Var(a:buffer, 'ruby_rubocop_executable')
     let l:config = ale#path#FindNearestFile(a:buffer, '.rubocop.yml')
@@ -12,12 +29,13 @@ function! ale#fixers#rubocop#GetCommand(buffer) abort
     \   . (!empty(l:config) ? ' --config ' . ale#Escape(l:config) : '')
     \   . (!empty(l:options) ? ' ' . l:options : '')
     \   . (l:auto_correct_all ? ' --auto-correct-all' : ' --auto-correct')
-    \   . ' --force-exclusion %t'
+    \   . ' --force-exclusion --stdin '
+    \   . ale#Escape(expand('#' . a:buffer . ':p'))
 endfunction
 
 function! ale#fixers#rubocop#Fix(buffer) abort
     return {
     \   'command': ale#fixers#rubocop#GetCommand(a:buffer),
-    \   'read_temporary_file': 1,
+    \   'process_with': 'ale#fixers#rubocop#PostProcess'
     \}
 endfunction

test/fixers/test_rubocop_fixer_callback.vader

@@ -21,9 +21,10 @@ Execute(The rubocop callback should return the correct default values):
 
   AssertEqual
   \ {
-  \   'read_temporary_file': 1,
+  \   'process_with': 'ale#fixers#rubocop#PostProcess',
   \   'command': ale#Escape(g:ale_ruby_rubocop_executable)
-  \     . ' --auto-correct --force-exclusion %t',
+  \     . ' --auto-correct --force-exclusion --stdin '
+  \     . ale#Escape(expand('#' . bufnr('') . ':p')),
   \ },
   \ ale#fixers#rubocop#Fix(bufnr(''))
 
@@ -32,10 +33,11 @@ Execute(The rubocop callback should include configuration files):
 
   AssertEqual
   \ {
-  \   'read_temporary_file': 1,
+  \   'process_with': 'ale#fixers#rubocop#PostProcess',
   \   'command': ale#Escape(g:ale_ruby_rubocop_executable)
   \     . ' --config ' . ale#Escape(ale#path#Simplify(g:dir . '/ruby_paths/with_config/.rubocop.yml'))
-  \     . ' --auto-correct --force-exclusion %t',
+  \     . ' --auto-correct --force-exclusion --stdin '
+  \     . ale#Escape(expand('#' . bufnr('') . ':p')),
   \ },
   \ ale#fixers#rubocop#Fix(bufnr(''))
 
@@ -45,11 +47,12 @@ Execute(The rubocop callback should include custom rubocop options):
 
   AssertEqual
   \ {
-  \   'read_temporary_file': 1,
+  \   'process_with': 'ale#fixers#rubocop#PostProcess',
   \   'command': ale#Escape(g:ale_ruby_rubocop_executable)
   \     . ' --config ' . ale#Escape(ale#path#Simplify(g:dir . '/ruby_paths/with_config/.rubocop.yml'))
   \     . ' --except Lint/Debugger'
-  \     . ' --auto-correct --force-exclusion %t',
+  \     . ' --auto-correct --force-exclusion --stdin '
+  \     . ale#Escape(expand('#' . bufnr('') . ':p')),
   \ },
   \ ale#fixers#rubocop#Fix(bufnr(''))
 
@@ -59,9 +62,49 @@ Execute(The rubocop callback should use auto-correct-all option when set):
 
   AssertEqual
   \ {
-  \   'read_temporary_file': 1,
+  \   'process_with': 'ale#fixers#rubocop#PostProcess',
   \   'command': ale#Escape(g:ale_ruby_rubocop_executable)
   \     . ' --config ' . ale#Escape(ale#path#Simplify(g:dir . '/ruby_paths/with_config/.rubocop.yml'))
-  \     . ' --auto-correct-all --force-exclusion %t',
+  \     . ' --auto-correct-all --force-exclusion --stdin '
+  \     . ale#Escape(expand('#' . bufnr('') . ':p')),
   \ },
   \ ale#fixers#rubocop#Fix(bufnr(''))
+
+Execute(The rubocop post-processor should remove diagnostics content):
+  AssertEqual
+  \ [
+  \   'class MyModel < ApplicationRecord',
+  \   '  # rubocop:disable Rails/InverseOf',
+  \   '  has_one :something',
+  \   '  # rubocop:enable Rails/InverseOf',
+  \   'end',
+  \   '',
+  \   'array = [1, 2, 3,',
+  \   '         4, 5, 6]',
+  \   'array = [''run'',',
+  \   '         ''forrest'',',
+  \   '         ''run'']',
+  \ ],
+  \ ale#fixers#rubocop#PostProcess(bufnr(''), [
+  \   'Inspecting 1 file',
+  \   'C',
+  \   '',
+  \   'Offenses:',
+  \   'app/models/my_model.rb:8:3: C: [Corrected] Layout/ArrayAlignment: ',
+  \   '4, 5, 6]',
+  \   '^',
+  \   '',
+  \   '1 file inspected, 3 offenses detected, 3 offenses corrected',
+  \   '====================',
+  \   'class MyModel < ApplicationRecord',
+  \   '  # rubocop:disable Rails/InverseOf',
+  \   '  has_one :something',
+  \   '  # rubocop:enable Rails/InverseOf',
+  \   'end',
+  \   '',
+  \   'array = [1, 2, 3,',
+  \   '         4, 5, 6]',
+  \   'array = [''run'',',
+  \   '         ''forrest'',',
+  \   '         ''run'']',
+  \ ])