functional pony linter

autoload/ale/handlers/pony.vim

@@ -0,0 +1,34 @@
+scriptencoding utf-8
+" Description: This file defines a handler function which ought to work for
+" any program which outputs errors in the format that ponyc uses.
+
+function! s:RemoveUnicodeQuotes(text) abort
+    let l:text = a:text
+    let l:text = substitute(l:text, '[`´‘’]', '''', 'g')
+    let l:text = substitute(l:text, '\v\\u2018([^\\]+)\\u2019', '''\1''', 'g')
+    let l:text = substitute(l:text, '[“”]', '"', 'g')
+
+    return l:text
+endfunction
+
+function! ale#handlers#pony#HandlePonycFormat(buffer, lines) abort
+    " Look for lines like the following.
+    " /home/code/pony/classes/Wombat.pony:22:30: can't lookup private fields from outside the type
+
+    let l:pattern = '\v^([^:]+):(\d+):(\d+)?:? (.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:item = {
+        \   'filename': l:match[1],
+        \   'lnum': str2nr(l:match[2]),
+        \   'col': str2nr(l:match[3]),
+        \   'type': 'E',
+        \   'text': s:RemoveUnicodeQuotes(l:match[4]),
+        \}
+
+        call add(l:output, l:item)
+    endfor
+
+    return l:output
+endfunction