Add tests for the command and executable callbacks, and make them use local node_modulse esxecutables like other linters

ale_linters/less/lessc.vim

@@ -1,12 +1,25 @@
-" Author: zanona <https://github.com/zanona>
+" Author: zanona <https://github.com/zanona>, w0rp <devw0rp@gmail.com>
 " Description: This file adds support for checking Less code with lessc.
 
+call ale#Set('less_lessc_executable', 'lessc')
 call ale#Set('less_lessc_options', '')
+call ale#Set('less_lessc_use_global', 0)
+
+function! ale_linters#less#lessc#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'less_lessc', [
+    \   'node_modules/.bin/lessc',
+    \])
+endfunction
 
 function! ale_linters#less#lessc#GetCommand(buffer) abort
-    return 'lessc'
-    \   . ' --no-color --lint --include-path=' . expand('%:p:h')
-    \   . ' ' . ale#Var(a:buffer, 'less_lessc_options')
+    let l:executable = ale_linters#less#lessc#GetExecutable(a:buffer)
+    let l:dir = expand('#' . a:buffer . ':p:h')
+    let l:options = ale#Var(a:buffer, 'less_lessc_options')
+
+    return ale#Escape(l:executable)
+    \   . ' --no-color --lint'
+    \   . ' --include-path=' . ale#Escape(l:dir)
+    \   . (!empty(l:options) ? ' ' . l:options : '')
     \   . ' -'
 endfunction
 
@@ -29,8 +42,8 @@ endfunction
 
 call ale#linter#Define('less', {
 \   'name': 'lessc',
-\   'executable': 'lessc',
-\   'output_stream': 'stderr',
+\   'executable_callback': 'ale_linters#less#lessc#GetExecutable',
 \   'command_callback': 'ale_linters#less#lessc#GetCommand',
 \   'callback': 'ale_linters#less#lessc#Handle',
+\   'output_stream': 'stderr',
 \})

doc/ale-less.txt

@@ -5,6 +5,14 @@ ALE Less Integration                                         *ale-less-options*
 ===============================================================================
 lessc                                                          *ale-less-lessc*
 
+g:ale_less_lessc_executable                       *g:ale_less_lessc_executable*
+                                                  *b:ale_less_lessc_executable*
+  Type: |String|
+  Default: `'lessc'`
+
+  See |ale-integrations-local-executables|
+
+
 g:ale_less_lessc_options                             *g:ale_less_lessc_options*
                                                      *b:ale_less_lessc_options*
   Type: |String|
@@ -13,6 +21,14 @@ g:ale_less_lessc_options                             *g:ale_less_lessc_options*
   This variable can be set to pass additional options to lessc.
 
 
+g:ale_less_lessc_use_global                       *g:ale_less_lessc_use_global*
+                                                  *b:ale_less_lessc_use_global*
+  Type: |String|
+  Default: `0`
+
+  See |ale-integrations-local-executables|
+
+
 ===============================================================================
 prettier                                                    *ale-less-prettier*
 
@@ -20,4 +36,4 @@ See |ale-javascript-prettier| for information about the available options.
 
 
 ===============================================================================
-
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -105,7 +105,7 @@ CONTENTS                                                         *ale-contents*
     latex.................................|ale-latex-options|
       write-good..........................|ale-latex-write-good|
     less..................................|ale-less-options|
-      lessc...............................|ale-less-lessc-options|
+      lessc...............................|ale-less-lessc|
       prettier............................|ale-less-prettier|
     llvm..................................|ale-llvm-options|
       llc.................................|ale-llvm-llc|

test/command_callback/test_lessc_command_callback.vader

@@ -0,0 +1,82 @@
+Before:
+  Save g:ale_less_lessc_executable
+  Save g:ale_less_lessc_use_global
+  Save g:ale_less_lessc_options
+
+  unlet! b:executable
+
+  unlet! g:ale_less_lessc_executable
+  unlet! g:ale_less_lessc_use_global
+  unlet! g:ale_less_lessc_options
+
+  call ale#test#SetDirectory('/testplugin/test/command_callback')
+  call ale#test#SetFilename('testfile.less')
+
+  runtime ale_linters/less/lessc.vim
+
+After:
+  Restore
+
+  unlet! b:executable
+  unlet! b:ale_less_lessc_executable
+  unlet! b:ale_less_lessc_use_global
+  unlet! b:ale_less_lessc_options
+
+  call ale#test#SetFilename('test.txt')
+
+  call ale#test#RestoreDirectory()
+  call ale#linter#Reset()
+
+Execute(node_modules directories should be discovered):
+  call ale#test#SetFilename('lessc_paths/nested/testfile.less')
+
+  let b:executable = ale#path#Winify(
+  \   g:dir
+  \   . '/lessc_paths/node_modules/.bin/lessc'
+  \)
+
+  AssertEqual
+  \ b:executable,
+  \ ale_linters#less#lessc#GetExecutable(bufnr(''))
+
+  AssertEqual
+  \ ale#Escape(b:executable)
+  \   . ' --no-color --lint'
+  \   . ' --include-path='
+  \     . ale#Escape(ale#path#Winify(g:dir . '/lessc_paths/nested'))
+  \   . ' -',
+  \ ale_linters#less#lessc#GetCommand(bufnr(''))
+
+Execute(The global override should work):
+  let b:ale_less_lessc_executable = 'foobar'
+  let b:ale_less_lessc_use_global = 1
+
+  call ale#test#SetFilename('lessc_paths/nested/testfile.less')
+
+  AssertEqual
+  \ 'foobar',
+  \ ale_linters#less#lessc#GetExecutable(bufnr(''))
+
+  AssertEqual
+  \ ale#Escape('foobar')
+  \   . ' --no-color --lint'
+  \   . ' --include-path='
+  \     . ale#Escape(ale#path#Winify(g:dir . '/lessc_paths/nested'))
+  \   . ' -',
+  \ ale_linters#less#lessc#GetCommand(bufnr(''))
+
+Execute(Extra options should be configurable):
+  let b:ale_less_lessc_options = '--whatever'
+
+  AssertEqual
+  \ 'lessc',
+  \ ale_linters#less#lessc#GetExecutable(bufnr(''))
+
+  AssertEqual
+  \ ale#Escape('lessc')
+  \   . ' --no-color --lint'
+  \   . ' --include-path='
+  \     . ale#Escape(ale#path#Winify(g:dir))
+  \   . ' --whatever'
+  \   . ' -',
+  \ ale_linters#less#lessc#GetCommand(bufnr(''))