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:  1.0
   6 "
   7 " Documentation:
   8 "   This plugin formats Python files.
   9 "
  10 " History:
  11 "  1.0:
  12 "    - initial version
  13
  14 if v:version < 700 || !has('python3')
  15     echo "This script requires vim7.0+ with Python 3.6 support."
  16     finish
  17 endif
  18
  19 if exists("g:load_black")
  20    finish
  21 endif
  22
  23 let g:load_black = "py1.0"
  24 if !exists("g:black_virtualenv")
  25   let g:black_virtualenv = "~/.vim/black"
  26 endif
  27 if !exists("g:black_fast")
  28   let g:black_fast = 0
  29 endif
  30 if !exists("g:black_linelength")
  31   let g:black_linelength = 88
  32 endif
  33 if !exists("g:black_skip_string_normalization")
  34   let g:black_skip_string_normalization = 0
  35 endif
  36
  37 python3 << endpython3
  38 import sys
  39 import vim
  40
  41 def _get_python_binary(exec_prefix):
  42   if sys.platform[:3] == "win":
  43     return exec_prefix / 'python.exe'
  44   return exec_prefix / 'bin' / 'python3'
  45
  46 def _get_pip(venv_path):
  47   if sys.platform[:3] == "win":
  48     return venv_path / 'Scripts' / 'pip.exe'
  49   return venv_path / 'bin' / 'pip'
  50
  51 def _get_virtualenv_site_packages(venv_path, pyver):
  52   if sys.platform[:3] == "win":
  53     return venv_path / 'Lib' / 'site-packages'
  54   return venv_path / 'lib' / f'python{pyver[0]}.{pyver[1]}' / 'site-packages'
  55
  56 def _initialize_black_env(upgrade=False):
  57   pyver = sys.version_info[:2]
  58   if pyver < (3, 6):
  59     print("Sorry, Black requires Python 3.6+ to run.")
  60     return False
  61
  62   from pathlib import Path
  63   import subprocess
  64   import venv
  65   virtualenv_path = Path(vim.eval("g:black_virtualenv")).expanduser()
  66   virtualenv_site_packages = str(_get_virtualenv_site_packages(virtualenv_path, pyver))
  67   first_install = False
  68   if not virtualenv_path.is_dir():
  69     print('Please wait, one time setup for Black.')
  70     _executable = sys.executable
  71     try:
  72       sys.executable = str(_get_python_binary(Path(sys.exec_prefix)))
  73       print(f'Creating a virtualenv in {virtualenv_path}...')
  74       print('(this path can be customized in .vimrc by setting g:black_virtualenv)')
  75       venv.create(virtualenv_path, with_pip=True)
  76     finally:
  77       sys.executable = _executable
  78     first_install = True
  79   if first_install:
  80     print('Installing Black with pip...')
  81   if upgrade:
  82     print('Upgrading Black with pip...')
  83   if first_install or upgrade:
  84     subprocess.run([str(_get_pip(virtualenv_path)), 'install', '-U', 'black'], stdout=subprocess.PIPE)
  85     print('DONE! You are all set, thanks for waiting ✨ 🍰 ✨')
  86   if first_install:
  87     print('Pro-tip: to upgrade Black in the future, use the :BlackUpgrade command and restart Vim.\n')
  88   if sys.path[0] != virtualenv_site_packages:
  89     sys.path.insert(0, virtualenv_site_packages)
  90   return True
  91
  92 if _initialize_black_env():
  93   import black
  94   import time
  95
  96 def Black():
  97   start = time.time()
  98   fast = bool(int(vim.eval("g:black_fast")))
  99   line_length = int(vim.eval("g:black_linelength"))
 100   mode = black.FileMode.AUTO_DETECT
 101   if bool(int(vim.eval("g:black_skip_string_normalization"))):
 102     mode |= black.FileMode.NO_STRING_NORMALIZATION
 103   buffer_str = '\n'.join(vim.current.buffer) + '\n'
 104   try:
 105     new_buffer_str = black.format_file_contents(buffer_str, line_length=line_length, fast=fast, mode=mode)
 106   except black.NothingChanged:
 107     print(f'Already well formatted, good job. (took {time.time() - start:.4f}s)')
 108   except Exception as exc:
 109     print(exc)
 110   else:
 111     vim.current.buffer[:] = new_buffer_str.split('\n')[:-1]
 112     print(f'Reformatted in {time.time() - start:.4f}s.')
 113
 114 def BlackUpgrade():
 115   _initialize_black_env(upgrade=True)
 116
 117 def BlackVersion():
 118   print(f'Black, version {black.__version__} on Python {sys.version}.')
 119
 120 endpython3
 121
 122 command! Black :py3 Black()
 123 command! BlackUpgrade :py3 BlackUpgrade()
 124 command! BlackVersion :py3 BlackVersion()
 125
 126 nmap ,= :Black<CR>
 127 vmap ,= :Black<CR>