Allow shfmt fixer to use .editorconfig (#4244)

* fix: added support for local solhint executable

* feat: added support for matching parse errors

* test: added test for solhint command callback and handler

* chore: removed command callback test

* refactor: made solhint handler structure closer to eslint

* refactor(shfmt-fixer): remove derivation of default CLI arguments

autoload/ale/fixers/shfmt.vim

@@ -5,27 +5,13 @@ scriptencoding utf-8
 call ale#Set('sh_shfmt_executable', 'shfmt')
 call ale#Set('sh_shfmt_options', '')
 
-function! s:DefaultOption(buffer) abort
-    if getbufvar(a:buffer, '&expandtab') == 0
-        " Tab is used by default
-        return ''
-    endif
-
-    let l:tabsize = getbufvar(a:buffer, '&shiftwidth')
-
-    if l:tabsize == 0
-        let l:tabsize = getbufvar(a:buffer, '&tabstop')
-    endif
-
-    return ' -i ' . l:tabsize
-endfunction
-
 function! ale#fixers#shfmt#Fix(buffer) abort
     let l:executable = ale#Var(a:buffer, 'sh_shfmt_executable')
     let l:options = ale#Var(a:buffer, 'sh_shfmt_options')
 
     return {
     \   'command': ale#Escape(l:executable)
-    \       . (empty(l:options) ? s:DefaultOption(a:buffer) : ' ' . l:options)
+    \       . ' -filename=%s'
+    \       . (empty(l:options) ? '' : ' ' . l:options)
     \}
 endfunction

test/fixers/test_shfmt_fixer_callback.vader

@@ -14,39 +14,6 @@ Execute(The shfmt callback should return 'shfmt' as default command):
   \ ale#fixers#shfmt#Fix(bufnr('')).command =~# '^' . ale#Escape('shfmt'),
   \ "Default command name is expected to be 'shfmt'"
 
-Execute(The shfmt callback should return the command with no option as default when noexpandtab is set):
-  let g:ale_sh_shfmt_executable = 'shfmt'
-  let g:ale_sh_shfmt_options = ''
-  setlocal noexpandtab
-  AssertEqual
-  \ {
-  \   'command': ale#Escape('shfmt'),
-  \ },
-  \ ale#fixers#shfmt#Fix(bufnr(''))
-
-Execute(The shfmt callback should return the command specifying indent width by looking shiftwidth as default):
-  let g:ale_sh_shfmt_executable = 'shfmt'
-  let g:ale_sh_shfmt_options = ''
-  setlocal expandtab
-  setlocal shiftwidth=4
-  AssertEqual
-  \ {
-  \   'command': ale#Escape('shfmt') . ' -i 4',
-  \ },
-  \ ale#fixers#shfmt#Fix(bufnr(''))
-
-Execute(The shfmt callback should return the command specifying indent width by looking tabstop when shiftwidth is 0 as default):
-  let g:ale_sh_shfmt_executable = 'shfmt'
-  let g:ale_sh_shfmt_options = ''
-  setlocal expandtab
-  setlocal shiftwidth=0
-  setlocal tabstop=8
-  AssertEqual
-  \ {
-  \   'command': ale#Escape('shfmt') . ' -i 8',
-  \ },
-  \ ale#fixers#shfmt#Fix(bufnr(''))
-
 Execute(The shfmt executable and options should be configurable):
   let g:ale_sh_shfmt_executable = 'foobar'
   let g:ale_sh_shfmt_options = '--some-option'
@@ -54,6 +21,7 @@ Execute(The shfmt executable and options should be configurable):
   AssertEqual
   \ {
   \   'command': ale#Escape('foobar')
+  \     . ' -filename=%s'
   \     . ' --some-option',
   \ },
   \ ale#fixers#shfmt#Fix(bufnr(''))