dfmt support (#2662)

* Add support for `dfmt`

autoload/ale/fix/registry.vim

@@ -27,6 +27,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['python'],
 \       'description': 'Fix PEP8 issues with black.',
 \   },
+\   'dfmt': {
+\       'function': 'ale#fixers#dfmt#Fix',
+\       'suggested_filetypes': ['d'],
+\       'description': 'Fix D files with dfmt.',
+\   },
 \   'fecs': {
 \       'function': 'ale#fixers#fecs#Fix',
 \       'suggested_filetypes': ['javascript', 'css', 'html'],

autoload/ale/fixers/dfmt.vim

@@ -0,0 +1,18 @@
+" Author: theoldmoon0602
+" Description: Integration of dfmt with ALE.
+
+call ale#Set('d_dfmt_executable', 'dfmt')
+call ale#Set('d_dfmt_options', '')
+
+function! ale#fixers#dfmt#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'd_dfmt_executable')
+    let l:options = ale#Var(a:buffer, 'd_dfmt_options')
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . ' -i'
+    \       . (empty(l:options) ? '' : ' ' . l:options)
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

doc/ale-d.txt

@@ -1,6 +1,15 @@
 ===============================================================================
 ALE D Integration                                               *ale-d-options*
 
+===============================================================================
+dfmt                                                               *ale-d-dfmt*
+
+g:ale_d_dfmt_options                                     *g:ale_d_dfmt_options*
+                                                         *b:ale_d_dfmt_options*
+  Type: |String|
+  Default: `''`
+
+This variable can be set to pass additional options to the dfmt fixer.
 
 ===============================================================================
 dls                                                                 *ale-d-dls*

doc/ale-supported-languages-and-tools.txt

@@ -103,6 +103,7 @@ Notes:
 * Cython (pyrex filetype)
   * `cython`
 * D
+  * `dfmt`
   * `dls`
   * `dmd`
   * `uncrustify`

doc/ale.txt

@@ -2066,6 +2066,7 @@ documented in additional help files.
     nvcc..................................|ale-cuda-nvcc|
     clang-format..........................|ale-cuda-clangformat|
   d.......................................|ale-d-options|
+    dfmt..................................|ale-d-dfmt|
     dls...................................|ale-d-dls|
     uncrustify............................|ale-d-uncrustify|
   dart....................................|ale-dart-options|

supported-tools.md

@@ -112,6 +112,7 @@ formatting.
 * Cython (pyrex filetype)
   * [cython](http://cython.org/)
 * D
+  * [dfmt](https://github.com/dlang-community/dfmt)
   * [dls](https://github.com/d-language-server/dls)
   * [dmd](https://dlang.org/dmd-linux.html)
   * [uncrustify](https://github.com/uncrustify/uncrustify)

test/fixers/test_dfmt_fixer_callback.vader

@@ -0,0 +1,40 @@
+Before:
+  Save g:ale_d_dfmt_executable
+  Save g:ale_d_dfmt_options
+
+  " Use an invalid global executable, so we don't match it.
+  let g:ale_d_dfmt_executable = 'xxxinvalid'
+  let g:ale_d_dfmt_options = ''
+
+  call ale#test#SetDirectory('/testplugin/test/fixers')
+
+After:
+  Restore
+
+  call ale#test#RestoreDirectory()
+
+Execute(The dfmt callback should return the correct default values):
+  call ale#test#SetFilename('../d_files/test.d')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape('xxxinvalid')
+  \     . ' -i'
+  \     . ' %t',
+  \ },
+  \ ale#fixers#dfmt#Fix(bufnr(''))
+
+Execute(The dfmt callback should include custom dfmt options):
+  let g:ale_d_dfmt_options = "--space-after-cast"
+  call ale#test#SetFilename('../d_files/test.d')
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape('xxxinvalid')
+  \     . ' -i'
+  \     . ' ' . g:ale_d_dfmt_options
+  \     . ' %t',
+  \ },
+  \ ale#fixers#dfmt#Fix(bufnr(''))