--- /dev/null
+" Author: Yining <zhang.yining@gmail.com>, Joseph Henrich <crimsonknave@gmail.com>
+" Description: ruff formatter as ALE fixer for python files
+
+call ale#Set('python_ruff_format_executable', 'ruff')
+call ale#Set('python_ruff_format_options', '')
+call ale#Set('python_ruff_format_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('python_ruff_format_change_directory', 1)
+call ale#Set('python_ruff_format_auto_pipenv', 0)
+call ale#Set('python_ruff_format_auto_poetry', 0)
+call ale#Set('python_ruff_format_auto_uv', 0)
+
+function! ale#fixers#ruff_format#GetCwd(buffer) abort
+ if ale#Var(a:buffer, 'python_ruff_format_change_directory')
+ " Run from project root if found, else from buffer dir.
+ let l:project_root = ale#python#FindProjectRoot(a:buffer)
+
+ return !empty(l:project_root) ? l:project_root : '%s:h'
+ endif
+
+ return '%s:h'
+endfunction
+
+function! ale#fixers#ruff_format#GetExecutable(buffer) abort
+ if (ale#Var(a:buffer, 'python_auto_pipenv') || ale#Var(a:buffer, 'python_ruff_format_auto_pipenv'))
+ \ && ale#python#PipenvPresent(a:buffer)
+ return 'pipenv'
+ endif
+
+ if (ale#Var(a:buffer, 'python_auto_poetry') || ale#Var(a:buffer, 'python_ruff_format_auto_poetry'))
+ \ && ale#python#PoetryPresent(a:buffer)
+ return 'poetry'
+ endif
+
+ if (ale#Var(a:buffer, 'python_auto_uv') || ale#Var(a:buffer, 'python_ruff_format_auto_uv'))
+ \ && ale#python#UvPresent(a:buffer)
+ return 'uv'
+ endif
+
+ return ale#python#FindExecutable(a:buffer, 'python_ruff_format', ['ruff'])
+endfunction
+
+function! ale#fixers#ruff_format#GetCommand(buffer) abort
+ let l:executable = ale#fixers#ruff_format#GetExecutable(a:buffer)
+ let l:exec_args = l:executable =~? '\(pipenv\|poetry\|uv\)$'
+ \ ? ' run ruff'
+ \ : ''
+
+ return ale#Escape(l:executable) . l:exec_args
+endfunction
+
+function! ale#fixers#ruff_format#Fix(buffer) abort
+ let l:executable = ale#fixers#ruff_format#GetExecutable(a:buffer)
+ let l:cmd = [ale#Escape(l:executable)]
+
+ if l:executable =~? '\(pipenv\|poetry\|uv\)$'
+ call extend(l:cmd, ['run', 'ruff'])
+ endif
+
+ let l:options = ale#Var(a:buffer, 'python_ruff_format_options')
+
+ " when --stdin-filename present, ruff will use it for proj root resolution
+ " https://github.com/charliermarsh/ruff/pull/1281
+ let l:fname = expand('#' . a:buffer . '...')
+ call add(l:cmd, 'format')
+
+ if !empty(l:options)
+ call add(l:cmd, l:options)
+ endif
+
+ call add(l:cmd, '--stdin-filename '.ale#Escape(ale#path#Simplify(l:fname)))
+
+ call add(l:cmd, '-')
+
+ return {
+ \ 'cwd': ale#fixers#ruff_format#GetCwd(a:buffer),
+ \ 'command': join(l:cmd, ' '),
+ \}
+endfunction