+" Author: Yining <zhang.yining@gmail.com>
+" Description: ruff as linter for python files
+
+call ale#Set('python_ruff_executable', 'ruff')
+call ale#Set('python_ruff_options', '')
+call ale#Set('python_ruff_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('python_ruff_change_directory', 1)
+call ale#Set('python_ruff_auto_pipenv', 0)
+call ale#Set('python_ruff_auto_poetry', 0)
+call ale#Set('python_ruff_auto_uv', 0)
+
+call ale#fix#registry#Add('ruff',
+\ 'ale#fixers#ruff#Fix',
+\ ['python'],
+\ 'A python linter/fixer for Python written in Rust'
+\)
+
+function! ale_linters#python#ruff#GetExecutable(buffer) abort
+ if (ale#Var(a:buffer, 'python_auto_pipenv') || ale#Var(a:buffer, 'python_ruff_auto_pipenv'))
+ \ && ale#python#PipenvPresent(a:buffer)
+ return 'pipenv'
+ endif
+
+ if (ale#Var(a:buffer, 'python_auto_poetry') || ale#Var(a:buffer, 'python_ruff_auto_poetry'))
+ \ && ale#python#PoetryPresent(a:buffer)
+ return 'poetry'
+ endif
+
+ if (ale#Var(a:buffer, 'python_auto_uv') || ale#Var(a:buffer, 'python_ruff_auto_uv'))
+ \ && ale#python#UvPresent(a:buffer)
+ return 'uv'
+ endif
+
+ return ale#python#FindExecutable(a:buffer, 'python_ruff', ['ruff'])
+endfunction
+
+function! ale_linters#python#ruff#GetCwd(buffer) abort
+ if ale#Var(a:buffer, 'python_ruff_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 ''
+endfunction
+
+function! ale_linters#python#ruff#GetCommand(buffer, version) abort
+ let l:executable = ale_linters#python#ruff#GetExecutable(a:buffer)
+ let l:exec_args = l:executable =~? '\(pipenv\|poetry\|uv\)$'
+ \ ? ' run ruff'
+ \ : ''
+
+ " NOTE: ruff 0.3.0 deprecates `ruff <path>` in favor of `ruff check <path>`
+ let l:exec_args = l:exec_args
+ \ . (ale#semver#GTE(a:version, [0, 3, 0]) ? ' check' : '')
+
+ " NOTE: ruff version `0.0.69` supports linting input from stdin
+ " NOTE: ruff version `0.1.0` deprecates `--format text`
+ return ale#Escape(l:executable) . l:exec_args . ' -q'
+ \ . ' --no-fix'
+ \ . ale#Pad(ale#Var(a:buffer, 'python_ruff_options'))
+ \ . (ale#semver#GTE(a:version, [0, 1, 0]) ? ' --output-format json-lines' : ' --format json-lines')
+ \ . (ale#semver#GTE(a:version, [0, 0, 69]) ? ' --stdin-filename %s -' : ' %s')
+endfunction
+
+function! ale_linters#python#ruff#Handle(buffer, lines) abort
+ let l:output = []
+
+ " Read all lines of ruff output and parse use all the valid JSONL lines.
+ for l:line in a:lines
+ try
+ let l:item = json_decode(l:line)
+ catch
+ let l:item = v:null
+ endtry
+
+ if !empty(l:item)
+ call add(l:output, {
+ \ 'lnum': l:item.location.row,
+ \ 'col': l:item.location.column,
+ \ 'end_lnum': l:item.end_location.row,
+ \ 'end_col': l:item.end_location.column - 1,
+ \ 'code': l:item.code,
+ \ 'text': l:item.message,
+ \ 'type': l:item.code =~? '\vE\d+' ? 'E' : 'W',
+ \})
+ endif
+ endfor
+
+ return l:output
+endfunction
+
+call ale#linter#Define('python', {
+\ 'name': 'ruff',
+\ 'executable': function('ale_linters#python#ruff#GetExecutable'),
+\ 'cwd': function('ale_linters#python#ruff#GetCwd'),
+\ 'command': {buffer -> ale#semver#RunWithVersionCheck(
+\ buffer,
+\ ale_linters#python#ruff#GetExecutable(buffer),
+\ '%e --version',
+\ function('ale_linters#python#ruff#GetCommand'),
+\ )},
+\ 'callback': 'ale_linters#python#ruff#Handle',
+\ 'output_stream': 'both',
+\ 'read_buffer': 1,
+\})