Add support for V: "v" (compiler) and "vfmt" fixer. (#3622)

* v: add "v fmt" fixer.

* v: add "v" (build) linter.

* v: fix vlint complaints and add documentation.

* v: add tests.

* v: use ale#Pad().

autoload/ale/fix/registry.vim

@@ -440,6 +440,11 @@ let s:default_registry = {
 \       'function': 'ale#fixers#ptop#Fix',
 \       'suggested_filetypes': ['pascal'],
 \       'description': 'Fix Pascal files with ptop.',
+\   },
+\   'vfmt': {
+\       'function': 'ale#fixers#vfmt#Fix',
+\       'suggested_filetypes': ['v'],
+\       'description': 'A formatter for V source code.',
 \   }
 \}
 

autoload/ale/fixers/vfmt.vim

@@ -0,0 +1,13 @@
+" Author: fiatjaf <fiatjaf@alhur.es>
+" Description: Integration of `v fmt` with ALE.
+
+call ale#Set('v_vfmt_options', '')
+
+function! ale#fixers#vfmt#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'v_v_executable')
+    let l:options = ale#Var(a:buffer, 'v_vfmt_options')
+
+    return {
+    \   'command': ale#Escape(l:executable) . ' fmt' . ale#Pad(l:options)
+    \}
+endfunction

autoload/ale/linter.vim

@@ -53,6 +53,7 @@ let s:default_ale_linters = {
 \   'text': [],
 \   'vue': ['eslint', 'vls'],
 \   'zsh': ['shell'],
+\   'v': ['v'],
 \}
 
 " Testing/debugging helper to unload all linters.