Merge pull request #1866 from Steap/feature/xmllint-fixer

Add support for xmllint as a fixer.

autoload/ale/fix/registry.vim

@@ -230,6 +230,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['dart'],
 \       'description': 'Fix Dart files with dartfmt.',
 \   },
+\   'xmllint': {
+\       'function': 'ale#fixers#xmllint#Fix',
+\       'suggested_filetypes': ['xml'],
+\       'description': 'Fix XML files with xmllint.',
+\   },
 \}
 
 " Reset the function registry to the default entries.

autoload/ale/fixers/xmllint.vim

@@ -0,0 +1,27 @@
+" Author: Cyril Roelandt <tipecaml@gmail.com>
+" Description: Integration of xmllint with ALE.
+
+call ale#Set('xml_xmllint_executable', 'xmllint')
+call ale#Set('xml_xmllint_options', '')
+call ale#Set('xml_xmllint_indentsize', 2)
+
+function! ale#fixers#xmllint#Fix(buffer) abort
+    let l:executable = ale#Escape(ale#Var(a:buffer, 'xml_xmllint_executable'))
+    let l:filename = ale#Escape(bufname(a:buffer))
+    let l:command = l:executable . ' --format ' . l:filename
+
+    let l:indent = ale#Var(a:buffer, 'xml_xmllint_indentsize')
+    if l:indent isnot# ''
+        let l:env = ale#Env('XMLLINT_INDENT', repeat(' ', l:indent))
+        let l:command = l:env . l:command
+    endif
+
+    let l:options = ale#Var(a:buffer, 'xml_xmllint_options')
+    if l:options isnot# ''
+        let l:command .= ' ' . l:options
+    endif
+
+    return {
+    \   'command': l:command
+    \}
+endfunction