I broke up with neovim....vim is my best friend now

dot_vim/plugged/ale/ale_linters/pony/ponyc.vim

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+" Description: ponyc linter for pony files
+
+call ale#Set('pony_ponyc_executable', 'ponyc')
+call ale#Set('pony_ponyc_options', '--pass paint')
+
+function! ale_linters#pony#ponyc#GetCommand(buffer) abort
+    return '%e' . ale#Pad(ale#Var(a:buffer, 'pony_ponyc_options'))
+endfunction
+
+call ale#linter#Define('pony', {
+\   'name': 'ponyc',
+\   'output_stream': 'stderr',
+\   'executable': {b -> ale#Var(b, 'pony_ponyc_executable')},
+\   'command': function('ale_linters#pony#ponyc#GetCommand'),
+\   'callback': 'ale#handlers#pony#HandlePonycFormat',
+\})