add nimpretty fixer

autoload/ale/fix/registry.vim

@@ -54,6 +54,11 @@ let s:default_registry = {
 \       'description': 'Apply elm-format to a file.',
 \       'aliases': ['format'],
 \   },
+\   'nimpretty': {
+\       'function': 'ale#fixers#nimpretty#Fix',
+\       'suggested_filetypes': ['nim'],
+\       'description': 'Apply nimpretty to a file.',
+\   },
 \   'eslint': {
 \       'function': 'ale#fixers#eslint#Fix',
 \       'suggested_filetypes': ['javascript', 'typescript'],

autoload/ale/fixers/nimpretty.vim

@@ -0,0 +1,21 @@
+" Author: Nhan <hi@imnhan.com>
+" Description: Integration of nimpretty with ALE.
+
+call ale#Set('nim_nimpretty_executable', 'nimpretty')
+call ale#Set('nim_nimpretty_options', '--maxLineLen:80')
+call ale#Set('nim_nimpretty_use_global', get(g:, 'ale_use_global_executables', 0))
+
+function! ale#fixers#nimpretty#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'nim_nimpretty', ['nimpretty'])
+endfunction
+
+function! ale#fixers#nimpretty#Fix(buffer) abort
+    let l:options = ale#Var(a:buffer, 'nim_nimpretty_options')
+
+    return {
+    \   'command': ale#Escape(ale#fixers#nimpretty#GetExecutable(a:buffer))
+    \       . ' %t'
+    \       . (empty(l:options) ? '' : ' ' . l:options),
+    \   'read_temporary_file': 1,
+    \}
+endfunction

test/fixers/test_nimpretty_fixer_callback.vader

@@ -0,0 +1,27 @@
+Before:
+  call ale#assert#SetUpFixerTest('nim', 'nimpretty')
+
+After:
+  call ale#test#RestoreDirectory()
+
+Execute(The nimpretty callback should return the correct default values):
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_nim_nimpretty_executable)
+  \     . ' %t --maxLineLen:80'
+  \ },
+  \ ale#fixers#nimpretty#Fix(bufnr(''))
+
+Execute(The nimpretty callback should include any additional options):
+  let g:ale_nim_nimpretty_options = '--some-option'
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_nim_nimpretty_executable)
+  \     . ' %t'
+  \     . ' --some-option',
+  \ },
+  \ ale#fixers#nimpretty#Fix(bufnr(''))