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f0b55b2307fc84312394934b08dfadfe3c7c2a65
[etc/vim.git] / 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 sys
41 import vim
42
43 def _get_python_binary(exec_prefix):
44   if sys.platform[:3] == "win":
45     return exec_prefix / 'python.exe'
46   return exec_prefix / 'bin' / 'python3'
47
48 def _get_pip(venv_path):
49   if sys.platform[:3] == "win":
50     return venv_path / 'Scripts' / 'pip.exe'
51   return venv_path / 'bin' / 'pip'
52
53 def _get_virtualenv_site_packages(venv_path, pyver):
54   if sys.platform[:3] == "win":
55     return venv_path / 'Lib' / 'site-packages'
56   return venv_path / 'lib' / f'python{pyver[0]}.{pyver[1]}' / 'site-packages'
57
58 def _initialize_black_env(upgrade=False):
59   pyver = sys.version_info[:2]
60   if pyver < (3, 6):
61     print("Sorry, Black requires Python 3.6+ to run.")
62     return False
63
64   from pathlib import Path
65   import subprocess
66   import venv
67   virtualenv_path = Path(vim.eval("g:black_virtualenv")).expanduser()
68   virtualenv_site_packages = str(_get_virtualenv_site_packages(virtualenv_path, pyver))
69   first_install = False
70   if not virtualenv_path.is_dir():
71     print('Please wait, one time setup for Black.')
72     _executable = sys.executable
73     try:
74       sys.executable = str(_get_python_binary(Path(sys.exec_prefix)))
75       print(f'Creating a virtualenv in {virtualenv_path}...')
76       print('(this path can be customized in .vimrc by setting g:black_virtualenv)')
77       venv.create(virtualenv_path, with_pip=True)
78     finally:
79       sys.executable = _executable
80     first_install = True
81   if first_install:
82     print('Installing Black with pip...')
83   if upgrade:
84     print('Upgrading Black with pip...')
85   if first_install or upgrade:
86     subprocess.run([str(_get_pip(virtualenv_path)), 'install', '-U', 'black'], stdout=subprocess.PIPE)
87     print('DONE! You are all set, thanks for waiting ✨ 🍰 ✨')
88   if first_install:
89     print('Pro-tip: to upgrade Black in the future, use the :BlackUpgrade command and restart Vim.\n')
90   if sys.path[0] != virtualenv_site_packages:
91     sys.path.insert(0, virtualenv_site_packages)
92   return True
93
94 if _initialize_black_env():
95   import black
96   import time
97
98 def Black():
99   start = time.time()
100   fast = bool(int(vim.eval("g:black_fast")))
101   line_length = int(vim.eval("g:black_linelength"))
102   mode = black.FileMode.AUTO_DETECT
103   if bool(int(vim.eval("g:black_skip_string_normalization"))):
104     mode |= black.FileMode.NO_STRING_NORMALIZATION
105   if vim.current.buffer.name.endswith('.pyi'):
106     mode |= black.FileMode.PYI
107   buffer_str = '\n'.join(vim.current.buffer) + '\n'
108   try:
109     new_buffer_str = black.format_file_contents(buffer_str, line_length=line_length, fast=fast, mode=mode)
110   except black.NothingChanged:
111     print(f'Already well formatted, good job. (took {time.time() - start:.4f}s)')
112   except Exception as exc:
113     print(exc)
114   else:
115     cursor = vim.current.window.cursor
116     vim.current.buffer[:] = new_buffer_str.split('\n')[:-1]
117     try:
118       vim.current.window.cursor = cursor
119     except vim.error:
120       vim.current.window.cursor = (len(vim.current.buffer), 0)
121     print(f'Reformatted in {time.time() - start:.4f}s.')
122
123 def BlackUpgrade():
124   _initialize_black_env(upgrade=True)
125
126 def BlackVersion():
127   print(f'Black, version {black.__version__} on Python {sys.version}.')
128
129 endpython3
130
131 command! Black :py3 Black()
132 command! BlackUpgrade :py3 BlackUpgrade()
133 command! BlackVersion :py3 BlackVersion()