Add zig fmt support (#4198)

* Add zig fmt support

* Review changes

* Fix linter errors

autoload/ale/fix/registry.vim

@@ -540,6 +540,11 @@ let s:default_registry = {
 \       'function': 'ale#fixers#vfmt#Fix',
 \       'suggested_filetypes': ['v'],
 \       'description': 'A formatter for V source code.',
+\   },
+\   'zigfmt': {
+\       'function': 'ale#fixers#zigfmt#Fix',
+\       'suggested_filetypes': ['zig'],
+\       'description': 'Official formatter for Zig',
 \   }
 \}
 

autoload/ale/fixers/zigfmt.vim

@@ -0,0 +1,14 @@
+scriptencoding utf-8
+" Author: Arash Mousavi <arash-m>
+" Description: Official formatter for Zig.
+
+call ale#Set('zig_zigfmt_executable', 'zig')
+
+function! ale#fixers#zigfmt#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'zig_zigfmt_executable')
+
+    return {
+    \   'command': ale#Escape(l:executable) . ' fmt %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction