Add jq as a JSON fixer

autoload/ale/fix/registry.vim

@@ -159,6 +159,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['java'],
 \       'description': 'Fix Java files with google-java-format.',
 \   },
+\   'jq': {
+\       'function': 'ale#fixers#jq#Fix',
+\       'suggested_filetypes': ['json'],
+\       'description': 'Fix JSON files with jq.',
+\   },
 \}
 
 " Reset the function registry to the default entries.

autoload/ale/fixers/jq.vim

@@ -0,0 +1,18 @@
+call ale#Set('json_jq_executable', 'jq')
+call ale#Set('json_jq_use_global', 0)
+call ale#Set('json_jq_options', '')
+
+function! ale#fixers#jq#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'jq', [
+    \   'jq',
+    \])
+endfunction
+
+function! ale#fixers#jq#Fix(buffer) abort
+     let l:options = ale#Var(a:buffer, 'json_jq_options')
+
+     return {
+     \  'command': ale#Escape(ale#fixers#jq#GetExecutable(a:buffer))
+     \      . ' . ' . l:options,
+     \}
+endfunction