Add hackfmt fixer

autoload/ale/fixers/hackfmt.vim

@@ -0,0 +1,18 @@
+" Author: Sam Howie <samhowie@gmail.com>
+" Description: Integration of hackfmt with ALE.
+
+call ale#Set('php_hackfmt_executable', 'hackfmt')
+call ale#Set('php_hackfmt_options', '')
+
+function! ale#fixers#hackfmt#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'php_hackfmt_executable')
+    let l:options = ale#Var(a:buffer, 'php_hackfmt_options')
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . ' -i'
+    \       . (empty(l:options) ? '' : ' ' . l:options)
+    \       . ' %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction