plugin/black.vim

   1 " black.vim
   2 " Author: Łukasz Langa
   3 " Created: Mon Mar 26 23:27:53 2018 -0700
   4 " Requires: Vim Ver7.0+
   5 " Version:  1.1
   6 "
   7 " Documentation:
   8 "   This plugin formats Python files.
   9 "
  10 " History:
  11 "  1.0:
  12 "    - initial version
  13 "  1.1:
  14 "    - restore cursor/window position after formatting
  15
  16 if v:version < 700 || !has('python3')
  17     func! __BLACK_MISSING()
  18         echo "The black.vim plugin requires vim7.0+ with Python 3.6 support."
  19     endfunc
  20     command! Black :call __BLACK_MISSING()
  21     command! BlackUpgrade :call __BLACK_MISSING()
  22     command! BlackVersion :call __BLACK_MISSING()
  23     finish
  24 endif
  25
  26 if exists("g:load_black")
  27    finish
  28 endif
  29
  30 let g:load_black = "py1.0"
  31 if !exists("g:black_virtualenv")
  32   if has("nvim")
  33     let g:black_virtualenv = "~/.local/share/nvim/black"
  34   else
  35     let g:black_virtualenv = "~/.vim/black"
  36   endif
  37 endif
  38 if !exists("g:black_fast")
  39   let g:black_fast = 0
  40 endif
  41 if !exists("g:black_linelength")
  42   let g:black_linelength = 88
  43 endif
  44 if !exists("g:black_skip_string_normalization")
  45   let g:black_skip_string_normalization = 0
  46 endif
  47
  48 python3 << EndPython3
  49 import collections
  50 import os
  51 import sys
  52 import vim
  53
  54
  55 class Flag(collections.namedtuple("FlagBase", "name, cast")):
  56   @property
  57   def var_name(self):
  58     return self.name.replace("-", "_")
  59
  60   @property
  61   def vim_rc_name(self):
  62     name = self.var_name
  63     if name == "line_length":
  64       name = name.replace("_", "")
  65     if name == "string_normalization":
  66       name = "skip_" + name
  67     return "g:black_" + name
  68
  69
  70 FLAGS = [
  71   Flag(name="line_length", cast=int),
  72   Flag(name="fast", cast=bool),
  73   Flag(name="string_normalization", cast=bool),
  74 ]
  75
  76
  77 def _get_python_binary(exec_prefix):
  78   try:
  79     default = vim.eval("g:pymode_python").strip()
  80   except vim.error:
  81     default = ""
  82   if default and os.path.exists(default):
  83     return default
  84   if sys.platform[:3] == "win":
  85     return exec_prefix / 'python.exe'
  86   return exec_prefix / 'bin' / 'python3'
  87
  88 def _get_pip(venv_path):
  89   if sys.platform[:3] == "win":
  90     return venv_path / 'Scripts' / 'pip.exe'
  91   return venv_path / 'bin' / 'pip'
  92
  93 def _get_virtualenv_site_packages(venv_path, pyver):
  94   if sys.platform[:3] == "win":
  95     return venv_path / 'Lib' / 'site-packages'
  96   return venv_path / 'lib' / f'python{pyver[0]}.{pyver[1]}' / 'site-packages'
  97
  98 def _initialize_black_env(upgrade=False):
  99   pyver = sys.version_info[:2]
 100   if pyver < (3, 6):
 101     print("Sorry, Black requires Python 3.6+ to run.")
 102     return False
 103
 104   from pathlib import Path
 105   import subprocess
 106   import venv
 107   virtualenv_path = Path(vim.eval("g:black_virtualenv")).expanduser()
 108   virtualenv_site_packages = str(_get_virtualenv_site_packages(virtualenv_path, pyver))
 109   first_install = False
 110   if not virtualenv_path.is_dir():
 111     print('Please wait, one time setup for Black.')
 112     _executable = sys.executable
 113     try:
 114       sys.executable = str(_get_python_binary(Path(sys.exec_prefix)))
 115       print(f'Creating a virtualenv in {virtualenv_path}...')
 116       print('(this path can be customized in .vimrc by setting g:black_virtualenv)')
 117       venv.create(virtualenv_path, with_pip=True)
 118     finally:
 119       sys.executable = _executable
 120     first_install = True
 121   if first_install:
 122     print('Installing Black with pip...')
 123   if upgrade:
 124     print('Upgrading Black with pip...')
 125   if first_install or upgrade:
 126     subprocess.run([str(_get_pip(virtualenv_path)), 'install', '-U', 'black'], stdout=subprocess.PIPE)
 127     print('DONE! You are all set, thanks for waiting ✨ 🍰 ✨')
 128   if first_install:
 129     print('Pro-tip: to upgrade Black in the future, use the :BlackUpgrade command and restart Vim.\n')
 130   if virtualenv_site_packages not in sys.path:
 131     sys.path.append(virtualenv_site_packages)
 132   return True
 133
 134 if _initialize_black_env():
 135   import black
 136   import time
 137
 138 def Black():
 139   start = time.time()
 140   configs = get_configs()
 141   mode = black.FileMode(
 142     line_length=configs["line_length"],
 143     string_normalization=configs["string_normalization"],
 144     is_pyi=vim.current.buffer.name.endswith('.pyi'),
 145   )
 146
 147   buffer_str = '\n'.join(vim.current.buffer) + '\n'
 148   try:
 149     new_buffer_str = black.format_file_contents(
 150       buffer_str,
 151       fast=configs["fast"],
 152       mode=mode,
 153     )
 154   except black.NothingChanged:
 155     print(f'Already well formatted, good job. (took {time.time() - start:.4f}s)')
 156   except Exception as exc:
 157     print(exc)
 158   else:
 159     current_buffer = vim.current.window.buffer
 160     cursors = []
 161     for i, tabpage in enumerate(vim.tabpages):
 162       if tabpage.valid:
 163         for j, window in enumerate(tabpage.windows):
 164           if window.valid and window.buffer == current_buffer:
 165             cursors.append((i, j, window.cursor))
 166     vim.current.buffer[:] = new_buffer_str.split('\n')[:-1]
 167     for i, j, cursor in cursors:
 168       window = vim.tabpages[i].windows[j]
 169       try:
 170         window.cursor = cursor
 171       except vim.error:
 172         window.cursor = (len(window.buffer), 0)
 173     print(f'Reformatted in {time.time() - start:.4f}s.')
 174
 175 def get_configs():
 176   path_pyproject_toml = black.find_pyproject_toml(vim.eval("fnamemodify(getcwd(), ':t')"))
 177   if path_pyproject_toml:
 178     toml_config = black.parse_pyproject_toml(path_pyproject_toml)
 179   else:
 180     toml_config = {}
 181
 182   return {
 183     flag.var_name: toml_config.get(flag.name, flag.cast(vim.eval(flag.vim_rc_name)))
 184     for flag in FLAGS
 185   }
 186
 187
 188 def BlackUpgrade():
 189   _initialize_black_env(upgrade=True)
 190
 191 def BlackVersion():
 192   print(f'Black, version {black.__version__} on Python {sys.version}.')
 193
 194 EndPython3
 195
 196 command! Black :py3 Black()
 197 command! BlackUpgrade :py3 BlackUpgrade()
 198 command! BlackVersion :py3 BlackVersion()