Make the executable for gometalinter configurable

ale_linters/go/gometalinter.vim

@@ -1,16 +1,22 @@
 " Author: Ben Reedy <https://github.com/breed808>
 " Description: Adds support for the gometalinter suite for Go files
 
-if !exists('g:ale_go_gometalinter_options')
-    let g:ale_go_gometalinter_options = ''
-endif
+call ale#Set('go_gometalinter_options', '')
+call ale#Set('go_gometalinter_executable', 'gometalinter')
+
+function! ale_linters#go#gometalinter#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'go_gometalinter_executable')
+endfunction
 
 function! ale_linters#go#gometalinter#GetCommand(buffer) abort
+    let l:executable = ale_linters#go#gometalinter#GetExecutable(a:buffer)
     let l:filename = expand('#' . a:buffer . ':p')
+    let l:options = ale#Var(a:buffer, 'go_gometalinter_options')
 
-    return 'gometalinter --include=''^' . l:filename . '.*$'' '
-    \   . ale#Var(a:buffer, 'go_gometalinter_options')
-    \   . ' ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h'))
+    return ale#Escape(l:executable)
+    \   . ' --include=''^' . l:filename . '.*$'''
+    \   . (!empty(l:options) ? ' ' . l:options : '')
+    \   . ' ' . ale#Escape(fnamemodify(l:filename, ':h'))
 endfunction
 
 function! ale_linters#go#gometalinter#GetMatches(lines) abort
@@ -36,7 +42,7 @@ endfunction
 
 call ale#linter#Define('go', {
 \   'name': 'gometalinter',
-\   'executable': 'gometalinter',
+\   'executable_callback': 'ale_linters#go#gometalinter#GetExecutable',
 \   'command_callback': 'ale_linters#go#gometalinter#GetCommand',
 \   'callback': 'ale_linters#go#gometalinter#Handler',
 \   'lint_file': 1,

doc/ale-go.txt

@@ -1,5 +1,5 @@
 ===============================================================================
-ALE Go Integration                                            *ale-go-options*
+ALE Go Integration                                             *ale-go-options*
 
 
 -------------------------------------------------------------------------------
@@ -21,20 +21,28 @@ while ensuring it doesn't run any linters known to be slow or resource
 intensive.
 
 -------------------------------------------------------------------------------
-gometalinter                                             *ale-go-gometalinter*
+gometalinter                                              *ale-go-gometalinter*
 
-g:ale_go_gometalinter_options                  *g:ale_go_gometalinter_options*
-                                               *b:ale_go_gometalinter_options*
+g:ale_go_gometalinter_executable             *g:ale_go_gometalinter_executable*
+                                             *b:ale_go_gometalinter_executable*
+  Type: |String|
+  Default: `'gometalinter'`
+
+  The executable that will be run for gometalinter.
+
+
+g:ale_go_gometalinter_options                   *g:ale_go_gometalinter_options*
+                                                *b:ale_go_gometalinter_options*
   Type: |String|
   Default: `''`
 
   This variable can be changed to alter the command-line arguments to the
   gometalinter invocation.
 
-Since `gometalinter` runs a number of linters that can consume a lot of
-resources it's recommended to set this option to a value of `--fast` if you
-use `gometalinter` as one of the linters in |g:ale_linters|. This disables a
-number of linters known to be slow or consume a lot of resources.
+  Since `gometalinter` runs a number of linters that can consume a lot of
+  resources it's recommended to set this option to a value of `--fast` if you
+  use `gometalinter` as one of the linters in |g:ale_linters|. This disables a
+  number of linters known to be slow or consume a lot of resources.
 
 
 -------------------------------------------------------------------------------

test/command_callback/test_gometalinter_command_callback.vader

@@ -0,0 +1,53 @@
+Before:
+  Save b:ale_go_gometalinter_executable
+  Save b:ale_go_gometalinter_options
+
+  let b:ale_go_gometalinter_executable = 'gometalinter'
+  let b:ale_go_gometalinter_options = ''
+
+  runtime ale_linters/go/gometalinter.vim
+
+  silent! cd /testplugin/test/command_callback
+  let g:dir = getcwd()
+
+  call ale#test#SetFilename('test.go')
+
+After:
+  Restore
+
+  silent execute 'cd ' . fnameescape(g:dir)
+  unlet! g:dir
+
+  call ale#linter#Reset()
+
+Execute(The gometalinter callback should return the right defaults):
+  AssertEqual
+  \ 'gometalinter',
+  \ ale_linters#go#gometalinter#GetExecutable(bufnr(''))
+  AssertEqual
+  \ ale#Escape('gometalinter')
+  \   . ' --include=''^' . expand('%:p') . '.*$'''
+  \   . ' ' . ale#Escape(getcwd()),
+  \ ale_linters#go#gometalinter#GetCommand(bufnr(''))
+
+Execute(The gometalinter callback should use a configured executable):
+  let b:ale_go_gometalinter_executable = 'something else'
+
+  AssertEqual
+  \ 'something else',
+  \ ale_linters#go#gometalinter#GetExecutable(bufnr(''))
+  AssertEqual
+  \ ale#Escape('something else')
+  \   . ' --include=''^' . expand('%:p') . '.*$'''
+  \   . ' ' . ale#Escape(getcwd()),
+  \ ale_linters#go#gometalinter#GetCommand(bufnr(''))
+
+Execute(The gometalinter callback should use configured options):
+  let b:ale_go_gometalinter_options = '--foobar'
+
+  AssertEqual
+  \ ale#Escape('gometalinter')
+  \   . ' --include=''^' . expand('%:p') . '.*$'''
+  \   . ' --foobar'
+  \   . ' ' . ale#Escape(getcwd()),
+  \ ale_linters#go#gometalinter#GetCommand(bufnr(''))