Refactor tidy support

* Add an option for file encoding
* Remove the type from text
* Fix linter's name

ale_linters/html/tidy.vim

@@ -7,7 +7,37 @@ endif
 
 let g:loaded_ale_linters_html_tidy = 1
 
-function! ale_linters#html#tidy#Handle(buffer, lines)
+" CLI options
+let g:ale_html_tidy_executable = get(g:, 'ale_html_tidy_executable', 'tidy')
+let g:ale_html_tidy_args = get(g:, 'ale_html_tidy_args', '-q -e -language en')
+
+function! ale_linters#html#tidy#GetCommand(buffer) abort
+
+    " Specify file encoding in options
+    " (Idea taken from https://github.com/scrooloose/syntastic/blob/master/syntax_checkers/html/tidy.vim)
+    let file_encoding = get({
+    \   'ascii':        '-ascii',
+    \   'big5':         '-big5',
+    \   'cp1252':       '-win1252',
+    \   'cp850':        '-ibm858',
+    \   'cp932':        '-shiftjis',
+    \   'iso-2022-jp':  '-iso-2022',
+    \   'latin1':       '-latin1',
+    \   'macroman':     '-mac',
+    \   'sjis':         '-shiftjis',
+    \   'utf-16le':     '-utf16le',
+    \   'utf-16':       '-utf16',
+    \   'utf-8':        '-utf8',
+    \ }, &fileencoding, '-utf8')
+
+    return printf('%s %s %s -',
+    \   g:ale_html_tidy_executable,
+    \   g:ale_html_tidy_args,
+    \   file_encoding
+    \ )
+endfunction
+
+function! ale_linters#html#tidy#Handle(buffer, lines) abort
     " Matches patterns lines like the following:
     " line 7 column 5 - Warning: missing </title> before </head>
 
@@ -24,7 +54,7 @@ function! ale_linters#html#tidy#Handle(buffer, lines)
         let line = match[1] + 0
         let col = match[2] + 0
         let type = match[3] ==# 'Error' ? 'E' : 'W'
-        let text = printf('[%s]%s', match[3], match[4])
+        let text = match[4]
 
         " vcol is Needed to indicate that the column is a character.
         call add(output, {
@@ -41,14 +71,10 @@ function! ale_linters#html#tidy#Handle(buffer, lines)
     return output
 endfunction
 
-" User options
-let g:ale_html_tidy_executable = get(g:, 'ale_html_tidy_executable', 'tidy')
-let g:ale_html_tidy_args = get(g:, 'ale_html_tidy_args', '-q -e -language en')
-
 call ALEAddLinter('html', {
-\   'name': g:ale_html_tidy_executable,
+\   'name': 'tidy',
 \   'executable': g:ale_html_tidy_executable,
-\   'command': printf('%s %s -', g:ale_html_tidy_executable, g:ale_html_tidy_args),
 \   'output_stream': 'stderr',
+\   'command_callback': 'ale_linters#html#tidy#GetCommand',
 \   'callback': 'ale_linters#html#tidy#Handle',
-\})
+\ })