add google-java-format fixer

autoload/ale/fix/registry.vim

@@ -154,6 +154,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['sh'],
 \       'description': 'Fix sh files with shfmt.',
 \   },
+\   'google_java_format': {
+\       'function': 'ale#fixers#google_java_format#Fix',
+\       'suggested_filetypes': ['java'],
+\       'description': 'Fix Java files with google-java-format.',
+\   },
 \}
 
 " Reset the function registry to the default entries.

autoload/ale/fixers/google_java_format.vim

@@ -0,0 +1,23 @@
+" Author: butlerx <butlerx@notthe,cloud>
+" Description: Integration of Google-java-format with ALE.
+
+call ale#Set('google_java_format_executable', 'google-java-format')
+call ale#Set('google_java_format_use_global', 0)
+call ale#Set('google_java_format_options', '')
+
+function! ale#fixers#google_java_format#Fix(buffer) abort
+    let l:options = ale#Var(a:buffer, 'google_java_format_options')
+    let l:executable = ale#Var(a:buffer, 'google_java_format_executable')
+
+    if !executable(l:executable)
+        return 0
+    endif
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . ' ' . (empty(l:options) ? '' : ' ' . l:options)
+    \       . ' --replace'
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction