5151 add mdformat support (#5152)

* fix(tests): fix ale_c_build_dir_names being unset in tests (#5109)

- Use ale#Set() to set the ale_c_build_dir_names variable.
- Ensure SetUpLinterTest() is called before any Save commands in tests.
- Add c.vim to runtime before non-linter tests are executed.
- Remove workarounds in c.vim.

* feat: Load Prettier from cjs also

* Add support for mdformat

---------

Co-authored-by: w0rp <devw0rp@gmail.com>

autoload/ale/fix/registry.vim

@@ -462,6 +462,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['markdown'],
 \       'description': 'Fix markdown files with pandoc.',
 \   },
+\   'mdformat': {
+\       'function': 'ale#fixers#mdformat#Fix',
+\       'suggested_filetypes': ['markdown'],
+\       'description': 'Fix Markdown files with mdformat.',
+\   },
 \   'pymarkdown': {
 \       'function': 'ale#fixers#pymarkdown#Fix',
 \       'suggested_filetypes': ['markdown'],

autoload/ale/fixers/mdformat.vim

@@ -0,0 +1,43 @@
+" Author: Horacio
+" Description: Fix Markdown files with mdformat.
+
+call ale#Set('markdown_mdformat_executable', 'mdformat')
+call ale#Set('markdown_mdformat_options', '')
+call ale#Set('markdown_mdformat_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('markdown_mdformat_auto_pipenv', 0)
+call ale#Set('markdown_mdformat_auto_poetry', 0)
+call ale#Set('markdown_mdformat_auto_uv', 0)
+
+function! ale#fixers#mdformat#GetExecutable(buffer) abort
+    if (ale#Var(a:buffer, 'python_auto_pipenv') || ale#Var(a:buffer, 'markdown_mdformat_auto_pipenv'))
+    \ && ale#python#PipenvPresent(a:buffer)
+        return 'pipenv'
+    endif
+
+    if (ale#Var(a:buffer, 'python_auto_poetry') || ale#Var(a:buffer, 'markdown_mdformat_auto_poetry'))
+    \ && ale#python#PoetryPresent(a:buffer)
+        return 'poetry'
+    endif
+
+    if (ale#Var(a:buffer, 'python_auto_uv') || ale#Var(a:buffer, 'markdown_mdformat_auto_uv'))
+    \ && ale#python#UvPresent(a:buffer)
+        return 'uv'
+    endif
+
+    return ale#python#FindExecutable(a:buffer, 'markdown_mdformat', ['mdformat'])
+endfunction
+
+function! ale#fixers#mdformat#Fix(buffer) abort
+    let l:executable = ale#fixers#mdformat#GetExecutable(a:buffer)
+    let l:command = ale#Escape(l:executable)
+
+    if l:executable =~? '\(pipenv\|poetry\|uv\)$'
+        let l:command .= ' run mdformat'
+    endif
+
+    return {
+    \   'command': l:command
+    \       . ale#Pad(ale#Var(a:buffer, 'markdown_mdformat_options'))
+    \       . ' -',
+    \}
+endfunction