Add clangtidy fixer (#2548)

* Add clangtidy fixer
* Add extra_options to clangtidy fixer
* Also, use cpp variables in cpp filetypes

autoload/ale/fix/registry.vim

@@ -145,6 +145,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['php'],
 \       'description': 'Fix PHP files with php-cs-fixer.',
 \   },
+\   'clangtidy': {
+\       'function': 'ale#fixers#clangtidy#Fix',
+\       'suggested_filetypes': ['c', 'cpp', 'objc'],
+\       'description': 'Fix C/C++ and ObjectiveC files with clang-tidy.',
+\   },
 \   'clang-format': {
 \       'function': 'ale#fixers#clangformat#Fix',
 \       'suggested_filetypes': ['c', 'cpp', 'cuda'],

autoload/ale/fixers/clangtidy.vim

@@ -0,0 +1,52 @@
+scriptencoding utf-8
+" Author: ObserverOfTime <chronobserver@disroot.org>
+" Description: Fixing C/C++ files with clang-tidy.
+
+function! s:set_variables() abort
+    let l:use_global = get(g:, 'ale_use_global_executables', 0)
+
+    for l:ft in ['c', 'cpp']
+        call ale#Set(l:ft . '_clangtidy_executable', 'clang-tidy')
+        call ale#Set(l:ft . '_clangtidy_use_global', l:use_global)
+        call ale#Set(l:ft . '_clangtidy_checks', [])
+        call ale#Set(l:ft . '_clangtidy_options', '')
+        call ale#Set(l:ft . '_clangtidy_extra_options', '')
+        call ale#Set(l:ft . '_clangtidy_fix_errors', 1)
+    endfor
+
+    call ale#Set('c_build_dir', '')
+endfunction
+
+call s:set_variables()
+
+function! ale#fixers#clangtidy#Var(buffer, name) abort
+    let l:ft = getbufvar(str2nr(a:buffer), '&filetype')
+    let l:ft = l:ft =~# 'cpp' ? 'cpp' : 'c'
+
+    return ale#Var(a:buffer, l:ft . '_clangtidy_' . a:name)
+endfunction
+
+function! ale#fixers#clangtidy#GetCommand(buffer) abort
+    let l:checks = join(ale#fixers#clangtidy#Var(a:buffer, 'checks'), ',')
+    let l:extra_options = ale#fixers#clangtidy#Var(a:buffer, 'extra_options')
+    let l:build_dir = ale#c#GetBuildDirectory(a:buffer)
+    let l:options = empty(l:build_dir)
+    \   ? ale#fixers#clangtidy#Var(a:buffer, 'options') : ''
+    let l:fix_errors = ale#fixers#clangtidy#Var(a:buffer, 'fix_errors')
+
+    return ' -fix' . (l:fix_errors ? ' -fix-errors' : '')
+    \   . (empty(l:checks) ? '' : ' -checks=' . ale#Escape(l:checks))
+    \   . (empty(l:extra_options) ? '' : ' ' . l:extra_options)
+    \   . (empty(l:build_dir) ? '' : ' -p ' . ale#Escape(l:build_dir))
+    \   . ' %t' . (empty(l:options) ? '' : ' -- ' . l:options)
+endfunction
+
+function! ale#fixers#clangtidy#Fix(buffer) abort
+    let l:executable = ale#fixers#clangtidy#Var(a:buffer, 'executable')
+    let l:command = ale#fixers#clangtidy#GetCommand(a:buffer)
+
+    return {
+    \   'command': ale#Escape(l:executable) . l:command,
+    \   'read_temporary_file': 1,
+    \}
+endfunction

doc/ale-c.txt

@@ -177,6 +177,15 @@ g:ale_c_clangtidy_extra_options               *g:ale_c_clangtidy_extra_options*
   This variable can be changed to modify flags given to clang-tidy.
 
 
+g:ale_c_clangtidy_fix_errors                     *g:ale_c_clangtidy_fix_errors*
+                                                 *b:ale_c_clangtidy_fix_errors*
+  Type: |Number|
+  Default: `1`
+
+  This variable can be changed to disable the `-fix-errors` option for the
+  |clangtidy| fixer.
+
+
 ===============================================================================
 cppcheck                                                       *ale-c-cppcheck*
 

doc/ale-cpp.txt

@@ -146,6 +146,15 @@ g:ale_cpp_clangtidy_extra_options           *g:ale_cpp_clangtidy_extra_options*
   This variable can be changed to modify flags given to clang-tidy.
 
 
+g:ale_cpp_clangtidy_fix_errors                 *g:ale_cpp_clangtidy_fix_errors*
+                                               *b:ale_cpp_clangtidy_fix_errors*
+  Type: |Number|
+  Default: `1`
+
+  This variable can be changed to disable the `-fix-errors` option for the
+  |clangtidy| fixer.
+
+
 ===============================================================================
 clazy                                                           *ale-cpp-clazy*
 

test/fixers/test_clangtidy_fixer_callback.vader

@@ -0,0 +1,51 @@
+Before:
+  Save g:ale_c_clangtidy_executable
+
+  " Use an invalid global executable, so we don't match it.
+  let g:ale_c_clangtidy_executable = 'xxxinvalid'
+  let g:ale_c_build_dir = ''
+
+  call ale#test#SetDirectory('/testplugin/test/fixers')
+  silent cd ../command_callback
+  let g:dir = getcwd()
+
+After:
+  Restore
+
+  call ale#test#RestoreDirectory()
+
+Execute(The clangtidy callback should return the correct default values):
+  call ale#test#SetFilename('c_paths/dummy.c')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_c_clangtidy_executable)
+  \       . ' -fix -fix-errors %t'
+  \ },
+  \ ale#fixers#clangtidy#Fix(bufnr(''))
+
+Execute(The clangtidy callback should include any additional options):
+  call ale#test#SetFilename('c_paths/dummy.c')
+  let g:ale_c_clangtidy_extra_options = '--some-option'
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_c_clangtidy_executable)
+  \     . ' -fix -fix-errors --some-option %t',
+  \ },
+  \ ale#fixers#clangtidy#Fix(bufnr(''))
+
+Execute(The clangtidy callback should support cpp files):
+  call ale#test#SetFilename('c_paths/dummy.cpp')
+  let g:ale_cpp_clangtidy_executable = 'invalidpp'
+  set filetype=cpp " The test fails without this
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_cpp_clangtidy_executable)
+  \     . ' -fix -fix-errors %t',
+  \ },
+  \ ale#fixers#clangtidy#Fix(bufnr(''))