Add commands to run ALEFix, and some tests to cover functionality so far. Add a simple autopep8 function.

autoload/ale/engine.vim

@@ -405,8 +405,7 @@ function! s:RunJob(options) abort
         \   : l:command
         \)
 
-        " TODO, get the exit system of the shell call and pass it on here.
-        call l:job_options.exit_cb(l:job_id, 0)
+        call l:job_options.exit_cb(l:job_id, v:shell_error)
     endif
 endfunction
 

autoload/ale/fix.vim

@@ -1,3 +1,6 @@
+" FIXME: Switch to using the global buffer data dictionary instead.
+" Cleanup will work better if there isn't a second Dictionary we have to work
+" with.
 let s:buffer_data = {}
 let s:job_info_map = {}
 
@@ -23,8 +26,6 @@ function! ale#fix#ApplyQueuedFixes() abort
         return
     endif
 
-    echom l:data.output[0]
-
     call setline(1, l:data.output)
 
     let l:start_line = len(l:data.output) + 1
@@ -145,11 +146,42 @@ function! s:RunJob(options) abort
         let l:job_options.out_cb = function('s:GatherOutput')
     endif
 
-    let l:job_id = ale#job#Start(l:command, l:job_options)
+    if get(g:, 'ale_emulate_job_failure') == 1
+        let l:job_id = 0
+    elseif get(g:, 'ale_run_synchronously') == 1
+        " Find a unique Job value to use, which will be the same as the ID for
+        " running commands synchronously. This is only for test code.
+        let l:job_id = len(s:job_info_map) + 1
 
-    " TODO: Check that the job runs, and skip to the next item if it does not.
+        while has_key(s:job_info_map, l:job_id)
+            let l:job_id += 1
+        endwhile
+    else
+        let l:job_id = ale#job#Start(l:command, l:job_options)
+    endif
+
+    if l:job_id == 0
+        return 0
+    endif
 
     let s:job_info_map[l:job_id] = l:job_info
+
+    if get(g:, 'ale_run_synchronously') == 1
+        " Run a command synchronously if this test option is set.
+        let l:output = systemlist(
+        \   type(l:command) == type([])
+        \   ?  join(l:command[0:1]) . ' ' . ale#Escape(l:command[2])
+        \   : l:command
+        \)
+
+        if !l:read_temporary_file
+            let s:job_info_map[l:job_id].output = l:output
+        endif
+
+        call l:job_options.exit_cb(l:job_id, v:shell_error)
+    endif
+
+    return 1
 endfunction
 
 function! s:RunFixer(options) abort
@@ -158,7 +190,7 @@ function! s:RunFixer(options) abort
     let l:index = a:options.callback_index
 
     while len(a:options.callback_list) > l:index
-        let l:result = function(a:options.callback_list[l:index])(l:buffer, l:input)
+        let l:result = function(a:options.callback_list[l:index])(l:buffer, copy(l:input))
 
         if type(l:result) == type(0) && l:result == 0
             " When `0` is returned, skip this item.
@@ -167,9 +199,7 @@ function! s:RunFixer(options) abort
             let l:input = l:result
             let l:index += 1
         else
-            " TODO: Check the return value here, and skip an index if
-            " the job fails.
-            call s:RunJob({
+            let l:job_ran = s:RunJob({
             \   'buffer': l:buffer,
             \   'command': l:result.command,
             \   'output_stream': get(l:result, 'output_stream', 'stdout'),
@@ -178,8 +208,13 @@ function! s:RunFixer(options) abort
             \   'callback_index': l:index,
             \})
 
-            " Stop here, we will handle exit later on.
-            return
+            if !l:job_ran
+                " The job failed to run, so skip to the next item.
+                let l:index += 1
+            else
+                " Stop here, we will handle exit later on.
+                return
+            endif
         endif
     endwhile
 

autoload/ale/handlers/python.vim

@@ -35,3 +35,9 @@ function! ale#handlers#python#HandlePEP8Format(buffer, lines) abort
 
     return l:output
 endfunction
+
+function! ale#handlers#python#AutoPEP8(buffer, lines) abort
+    return {
+    \   'command': 'autopep8 -'
+    \}
+endfunction

plugin/ale.vim

@@ -60,6 +60,9 @@ let g:ale_filetype_blacklist = ['nerdtree', 'unite', 'tags']
 " This Dictionary configures which linters are enabled for which languages.
 let g:ale_linters = get(g:, 'ale_linters', {})
 
+" This Dictionary configures which functions will be used for fixing problems.
+let g:ale_fixers = get(g:, 'ale_fixers', {})
+
 " This Dictionary allows users to set up filetype aliases for new filetypes.
 let g:ale_linter_aliases = get(g:, 'ale_linter_aliases', {})
 
@@ -276,6 +279,9 @@ command! -bar ALEInfo :call ale#debugging#Info()
 " The same, but copy output to your clipboard.
 command! -bar ALEInfoToClipboard :call ale#debugging#InfoToClipboard()
 
+" Fix problems in files.
+command! -bar ALEFix :call ale#fix#Fix()
+
 " <Plug> mappings for commands
 nnoremap <silent> <Plug>(ale_previous) :ALEPrevious<Return>
 nnoremap <silent> <Plug>(ale_previous_wrap) :ALEPreviousWrap<Return>
@@ -284,6 +290,7 @@ nnoremap <silent> <Plug>(ale_next_wrap) :ALENextWrap<Return>
 nnoremap <silent> <Plug>(ale_toggle) :ALEToggle<Return>
 nnoremap <silent> <Plug>(ale_lint) :ALELint<Return>
 nnoremap <silent> <Plug>(ale_detail) :ALEDetail<Return>
+nnoremap <silent> <Plug>(ale_fix) :ALEFix<Return>
 
 " Housekeeping
 

test/test_ale_fix.vader

@@ -0,0 +1,109 @@
+Before:
+  Save g:ale_fixers, &shell
+  let g:ale_run_synchronously = 1
+  let g:ale_fixers = {
+  \ 'testft': [],
+  \}
+  let &shell = '/bin/bash'
+
+  function AddCarets(buffer, lines) abort
+    " map() is applied to the original lines here.
+    " This way, we can ensure that defensive copies are made.
+    return map(a:lines, '''^'' . v:val')
+  endfunction
+
+  function AddDollars(buffer, lines) abort
+    return map(a:lines, '''$'' . v:val')
+  endfunction
+
+  function DoNothing(buffer, lines) abort
+    return 0
+  endfunction
+
+  function CatLine(buffer, lines) abort
+    return {'command': 'cat - <(echo d)'}
+  endfunction
+
+  function ReplaceWithTempFile(buffer, lines) abort
+    return {'command': 'echo x > %t', 'read_temporary_file': 1}
+  endfunction
+
+After:
+  Restore
+  unlet! g:ale_run_synchronously
+  unlet! g:ale_emulate_job_failure
+  delfunction AddCarets
+  delfunction AddDollars
+  delfunction DoNothing
+  delfunction CatLine
+  delfunction ReplaceWithTempFile
+
+Given testft (A file with three lines):
+  a
+  b
+  c
+
+Execute(ALEFix should complain when there are no functions to call):
+  AssertThrows ALEFix
+  AssertEqual 'Vim(echoerr):No fixers have been defined for filetype: testft', g:vader_exception
+
+Execute(ALEFix should apply simple functions):
+  let g:ale_fixers.testft = ['AddCarets']
+  ALEFix
+
+Expect(The first function should be used):
+  ^a
+  ^b
+  ^c
+
+Execute(ALEFix should apply simple functions in a chain):
+  let g:ale_fixers.testft = ['AddCarets', 'AddDollars']
+  ALEFix
+
+Expect(Both functions should be used):
+  $^a
+  $^b
+  $^c
+
+Execute(ALEFix should allow 0 to be returned to skip functions):
+  let g:ale_fixers.testft = ['DoNothing', 'AddDollars']
+  ALEFix
+
+Expect(Only the second function should be applied):
+  $a
+  $b
+  $c
+
+Execute(ALEFix should allow commands to be run):
+  let g:ale_fixers.testft = ['CatLine']
+  ALEFix
+
+Expect(An extra line should be added):
+  a
+  b
+  c
+  d
+
+Execute(ALEFix should allow temporary files to be read):
+  let g:ale_fixers.testft = ['ReplaceWithTempFile']
+  ALEFix
+
+Expect(The line we wrote to the temporary file should be used here):
+  x
+
+Execute(ALEFix should allow jobs and simple functions to be combined):
+  let g:ale_fixers.testft = ['ReplaceWithTempFile', 'AddDollars']
+  ALEFix
+
+Expect(The lines from the temporary file should be modified):
+  $x
+
+Execute(ALEFix should skip commands when jobs fail to run):
+  let g:ale_emulate_job_failure = 1
+  let g:ale_fixers.testft = ['CatLine', 'AddDollars']
+  ALEFix
+
+Expect(Only the second function should be applied):
+  $a
+  $b
+  $c

test/test_ale_toggle.vader

@@ -11,6 +11,7 @@ Before:
   \ 'valid': 1,
   \}]
   let g:expected_groups = [
+  \ 'ALEBufferFixGroup',
   \ 'ALECleanupGroup',
   \ 'ALECursorGroup',
   \ 'ALEHighlightBufferGroup',
@@ -101,7 +102,7 @@ Execute(ALEToggle should reset everything and then run again):
   AssertEqual [], getloclist(0)
   AssertEqual [], ale#sign#FindCurrentSigns(bufnr('%'))
   AssertEqual [], getmatches()
-  AssertEqual ['ALECleanupGroup', 'ALEHighlightBufferGroup'], ParseAuGroups()
+  AssertEqual ['ALEBufferFixGroup', 'ALECleanupGroup', 'ALEHighlightBufferGroup'], ParseAuGroups()
 
   " Toggle ALE on, everything should be set up and run again.
   ALEToggle

test/test_eslint_executable_detection.vader

@@ -20,7 +20,7 @@ Execute(create-react-app directories should be detected correctly):
 
   AssertEqual
   \ g:dir . '/eslint-test-files/react-app/node_modules/eslint/bin/eslint.js',
-  \ ale_linters#javascript#eslint#GetExecutable(bufnr(''))
+  \ ale#handlers#eslint#GetExecutable(bufnr(''))
 
   :q
 
@@ -31,7 +31,7 @@ Execute(use-global should override create-react-app detection):
 
   AssertEqual
   \ 'eslint_d',
-  \ ale_linters#javascript#eslint#GetExecutable(bufnr(''))
+  \ ale#handlers#eslint#GetExecutable(bufnr(''))
 
   :q
 
@@ -40,7 +40,7 @@ Execute(other app directories should be detected correctly):
 
   AssertEqual
   \ g:dir . '/eslint-test-files/node_modules/.bin/eslint',
-  \ ale_linters#javascript#eslint#GetExecutable(bufnr(''))
+  \ ale#handlers#eslint#GetExecutable(bufnr(''))
 
   :q
 
@@ -51,6 +51,6 @@ Execute(use-global should override other app directories):
 
   AssertEqual
   \ 'eslint_d',
-  \ ale_linters#javascript#eslint#GetExecutable(bufnr(''))
+  \ ale#handlers#eslint#GetExecutable(bufnr(''))
 
   :q