Update Ale.

sources_non_forked/ale/ale_linters/yaml/actionlint.vim

@@ -0,0 +1,10 @@
+" Author: bretello <bretello@distruzione.org>
+
+call ale#Set('yaml_actionlint_executable', 'actionlint')
+
+call ale#linter#Define('yaml', {
+\   'name': 'actionlint',
+\   'executable': {b -> ale#Var(b, 'yaml_actionlint_executable')},
+\   'command': function('ale#handlers#actionlint#GetCommand'),
+\   'callback': 'ale#handlers#actionlint#Handle',
+\})

sources_non_forked/ale/ale_linters/yaml/ls.vim

@@ -0,0 +1,34 @@
+" Author: Jeffrey Lau - https://github.com/zoonfafer
+" Description: YAML Language Server https://github.com/redhat-developer/yaml-language-server
+
+call ale#Set('yaml_ls_executable', 'yaml-language-server')
+call ale#Set('yaml_ls_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('yaml_ls_config', {})
+
+function! ale_linters#yaml#ls#GetExecutable(buffer) abort
+    return ale#path#FindExecutable(a:buffer, 'yaml_ls', [
+    \   'node_modules/.bin/yaml-language-server',
+    \])
+endfunction
+
+function! ale_linters#yaml#ls#GetCommand(buffer) abort
+    let l:executable = ale_linters#yaml#ls#GetExecutable(a:buffer)
+
+    return ale#Escape(l:executable) . ' --stdio'
+endfunction
+
+" Just use the current file
+function! ale_linters#yaml#ls#FindProjectRoot(buffer) abort
+    let l:project_file = expand('#' . a:buffer . ':p')
+
+    return fnamemodify(l:project_file, ':h')
+endfunction
+
+call ale#linter#Define('yaml', {
+\   'name': 'yaml-language-server',
+\   'lsp': 'stdio',
+\   'executable': function('ale_linters#yaml#ls#GetExecutable'),
+\   'command': function('ale_linters#yaml#ls#GetCommand'),
+\   'project_root': function('ale_linters#yaml#ls#FindProjectRoot'),
+\   'lsp_config': {b -> ale#Var(b, 'yaml_ls_config')},
+\})