Add vim-language-server linter support

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

@@ -485,6 +485,7 @@ Notes:
   * `vcom`
   * `xvhdl`
 * Vim
+  * `vimls`
   * `vint`
 * Vim help^
   * `alex`!!

doc/ale-vim.txt

@@ -2,6 +2,61 @@
 ALE Vim Integration                                           *ale-vim-options*
 
 
+===============================================================================
+vimls                                                           *ale-vim-vimls*
+
+  The `vim-language-server` is the engine that powers VimL editor support
+  using the Language Server Protocol.  See the installation instructions:
+  https://github.com/iamcco/vim-language-server#install
+
+g:ale_vim_vimls_executable                         *g:ale_vim_vimls_executable*
+                                                   *b:ale_vim_vimls_executable*
+  Type: |String|
+  Default: `'vim-language-server'`
+
+  This option can be set to change the executable path for vimls.
+
+
+g:ale_vim_vimls_config                                 *g:ale_vim_vimls_config*
+                                                       *b:ale_vim_vimls_config*
+  Type: |Dictionary|
+  Default: `{}`
+
+  Dictionary containing configuration settings that will be passed to the
+  language server. For example: >
+    {
+    \  'vim': {
+    \    'iskeyword': '@,48-57,_,192-255,-#',
+    \    'vimruntime': '',
+    \    'runtimepath': '',
+    \    'diagnostic': {
+    \      'enable': v:true
+    \    },
+    \    'indexes': {
+    \      'runtimepath': v:true,
+    \      'gap': 100,
+    \      'count': 3,
+    \      'projectRootPatterns' : ['.git', 'autoload', 'plugin']
+    \    },
+    \    'suggest': {
+    \      'fromVimruntime': v:true,
+    \      'fromRuntimepath': v:false
+    \    },
+    \  }
+    \}
+<
+  Consult the vim-language-server documentation for more information about
+  settings.
+
+
+g:ale_vim_vimls_use_global                         *g:ale_vim_vimls_use_global*
+                                                   *b:ale_vim_vimls_use_global*
+  Type: |Number|
+  Default: `get(g:, 'ale_use_global_executables', 0)`
+
+  See |ale-integrations-local-executables|
+
+
 ===============================================================================
 vint                                                             *ale-vim-vint*
 

doc/ale.txt

@@ -2655,6 +2655,7 @@ documented in additional help files.
     vcom..................................|ale-vhdl-vcom|
     xvhdl.................................|ale-vhdl-xvhdl|
   vim.....................................|ale-vim-options|
+    vimls.................................|ale-vim-vimls|
     vint..................................|ale-vim-vint|
   vim help................................|ale-vim-help-options|
     write-good............................|ale-vim-help-write-good|