feat: Add protolint as linter and fixer (#2911)

autoload/ale/fix/registry.vim

@@ -346,6 +346,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['json'],
 \       'description': 'Fix JSON files with jq.',
 \   },
+\   'protolint': {
+\       'function': 'ale#fixers#protolint#Fix',
+\       'suggested_filetypes': ['proto'],
+\       'description': 'Fix Protocol Buffer files with protolint.',
+\   },
 \   'perltidy': {
 \       'function': 'ale#fixers#perltidy#Fix',
 \       'suggested_filetypes': ['perl'],

autoload/ale/fixers/protolint.vim

@@ -0,0 +1,26 @@
+" Author: Yohei Yoshimuta <yoheimuta@gmail.com>
+" Description: Integration of protolint with ALE.
+
+call ale#Set('proto_protolint_executable', 'protolint')
+call ale#Set('proto_protolint_config', '')
+
+function! ale#fixers#protolint#GetExecutable(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'proto_protolint_executable')
+
+    return ale#Escape(l:executable)
+endfunction
+
+function! ale#fixers#protolint#Fix(buffer) abort
+    let l:executable = ale#fixers#protolint#GetExecutable(a:buffer)
+    let l:config = ale#Var(a:buffer, 'proto_protolint_config')
+
+    return {
+    \   'command': l:executable
+    \       . (!empty(l:config) ? ' -config_path=' . ale#Escape(l:config) : '')
+    \       . ' -fix'
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction
+
+