feat(markdown): add rumdl server and fixer (#5115)

* feat: put in the main linter files

* feat: add to registry

* docs: add rumdl to docs

* tests: vader tests

* edit: actually split the options into two

* style: make rumdl fixer test mimic markdownlint

* fix: stupidity overwhelming

* fix: actually let's look for pyproject too

copied from tombi

* i'm a buffoon fix wrong indentation

* alignment ci is made for people like me

* missed toc entry

autoload/ale/fix/registry.vim

@@ -767,6 +767,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['markdown'],
 \       'description': 'Fix markdown files with markdownlint.',
 \   },
+\   'rumdl': {
+\       'function': 'ale#fixers#rumdl#Fix',
+\       'suggested_filetypes': ['markdown'],
+\       'description': 'Fix markdown files with rumdl.',
+\   },
 \}
 
 " Reset the function registry to the default entries.

autoload/ale/fixers/rumdl.vim

@@ -0,0 +1,18 @@
+scriptencoding utf-8
+
+" Author: Evan Chen <evan@evanchen.cc>
+" Description: Fast Markdown linter and formatter written in Rust
+
+
+call ale#Set('markdown_rumdl_executable', 'rumdl')
+call ale#Set('markdown_rumdl_fmt_options', '--silent')
+
+function! ale#fixers#rumdl#Fix(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'markdown_rumdl_executable')
+    let l:options = ale#Var(a:buffer, 'markdown_rumdl_fmt_options')
+
+    return {
+    \   'command': ale#Escape(l:executable) . ' fmt -'
+    \       . ale#Pad(l:options),
+    \}
+endfunction