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     echo "This script requires vim7.0+ with Python 3.6 support."
  18     finish
  19 endif
  20
  21 if exists("g:load_black")
  22    finish
  23 endif
  24
  25 let g:load_black = "py1.0"
  26 if !exists("g:black_virtualenv")
  27   let g:black_virtualenv = "~/.vim/black"
  28 endif
  29 if !exists("g:black_fast")
  30   let g:black_fast = 0
  31 endif
  32 if !exists("g:black_linelength")
  33   let g:black_linelength = 88
  34 endif
  35 if !exists("g:black_skip_string_normalization")
  36   let g:black_skip_string_normalization = 0
  37 endif
  38
  39 python3 << endpython3
  40 import os
  41 import sys
  42 import vim
  43
  44 def _get_python_binary(exec_prefix):
  45   try:
  46     default = vim.eval("g:pymode_python").strip()
  47   except vim.error:
  48     default = ""
  49   if default and os.path.exists(default):
  50     return default
  51   if sys.platform[:3] == "win":
  52     return exec_prefix / 'python.exe'
  53   return exec_prefix / 'bin' / 'python3'
  54
  55 def _get_pip(venv_path):
  56   if sys.platform[:3] == "win":
  57     return venv_path / 'Scripts' / 'pip.exe'
  58   return venv_path / 'bin' / 'pip'
  59
  60 def _get_virtualenv_site_packages(venv_path, pyver):
  61   if sys.platform[:3] == "win":
  62     return venv_path / 'Lib' / 'site-packages'
  63   return venv_path / 'lib' / f'python{pyver[0]}.{pyver[1]}' / 'site-packages'
  64
  65 def _initialize_black_env(upgrade=False):
  66   pyver = sys.version_info[:2]
  67   if pyver < (3, 6):
  68     print("Sorry, Black requires Python 3.6+ to run.")
  69     return False
  70
  71   from pathlib import Path
  72   import subprocess
  73   import venv
  74   virtualenv_path = Path(vim.eval("g:black_virtualenv")).expanduser()
  75   virtualenv_site_packages = str(_get_virtualenv_site_packages(virtualenv_path, pyver))
  76   first_install = False
  77   if not virtualenv_path.is_dir():
  78     print('Please wait, one time setup for Black.')
  79     _executable = sys.executable
  80     try:
  81       sys.executable = str(_get_python_binary(Path(sys.exec_prefix)))
  82       print(f'Creating a virtualenv in {virtualenv_path}...')
  83       print('(this path can be customized in .vimrc by setting g:black_virtualenv)')
  84       venv.create(virtualenv_path, with_pip=True)
  85     finally:
  86       sys.executable = _executable
  87     first_install = True
  88   if first_install:
  89     print('Installing Black with pip...')
  90   if upgrade:
  91     print('Upgrading Black with pip...')
  92   if first_install or upgrade:
  93     subprocess.run([str(_get_pip(virtualenv_path)), 'install', '-U', 'black'], stdout=subprocess.PIPE)
  94     print('DONE! You are all set, thanks for waiting ✨ 🍰 ✨')
  95   if first_install:
  96     print('Pro-tip: to upgrade Black in the future, use the :BlackUpgrade command and restart Vim.\n')
  97   if sys.path[0] != virtualenv_site_packages:
  98     sys.path.insert(0, virtualenv_site_packages)
  99   return True
 100
 101 if _initialize_black_env():
 102   import black
 103   import time
 104
 105 def Black():
 106   start = time.time()
 107   fast = bool(int(vim.eval("g:black_fast")))
 108   mode = black.FileMode(
 109     line_length=int(vim.eval("g:black_linelength")),
 110     string_normalization=not bool(int(vim.eval("g:black_skip_string_normalization"))),
 111     is_pyi=vim.current.buffer.name.endswith('.pyi'),
 112   )
 113   buffer_str = '\n'.join(vim.current.buffer) + '\n'
 114   try:
 115     new_buffer_str = black.format_file_contents(buffer_str, fast=fast, mode=mode)
 116   except black.NothingChanged:
 117     print(f'Already well formatted, good job. (took {time.time() - start:.4f}s)')
 118   except Exception as exc:
 119     print(exc)
 120   else:
 121     cursor = vim.current.window.cursor
 122     vim.current.buffer[:] = new_buffer_str.split('\n')[:-1]
 123     try:
 124       vim.current.window.cursor = cursor
 125     except vim.error:
 126       vim.current.window.cursor = (len(vim.current.buffer), 0)
 127     print(f'Reformatted in {time.time() - start:.4f}s.')
 128
 129 def BlackUpgrade():
 130   _initialize_black_env(upgrade=True)
 131
 132 def BlackVersion():
 133   print(f'Black, version {black.__version__} on Python {sys.version}.')
 134
 135 endpython3
 136
 137 command! Black :py3 Black()
 138 command! BlackUpgrade :py3 BlackUpgrade()
 139 command! BlackVersion :py3 BlackVersion()