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Autogenerate black(d|-primer)? help in usage docs (#2212)
[etc/vim.git] / autoload / black.vim
1 python3 << EndPython3
2 import collections
3 import os
4 import sys
5 import vim
6 from distutils.util import strtobool
7
8
9 class Flag(collections.namedtuple("FlagBase", "name, cast")):
10   @property
11   def var_name(self):
12     return self.name.replace("-", "_")
13
14   @property
15   def vim_rc_name(self):
16     name = self.var_name
17     if name == "line_length":
18       name = name.replace("_", "")
19     return "g:black_" + name
20
21
22 FLAGS = [
23   Flag(name="line_length", cast=int),
24   Flag(name="fast", cast=strtobool),
25   Flag(name="string_normalization", cast=strtobool),
26   Flag(name="quiet", cast=strtobool),
27 ]
28
29
30 def _get_python_binary(exec_prefix):
31   try:
32     default = vim.eval("g:pymode_python").strip()
33   except vim.error:
34     default = ""
35   if default and os.path.exists(default):
36     return default
37   if sys.platform[:3] == "win":
38     return exec_prefix / 'python.exe'
39   return exec_prefix / 'bin' / 'python3'
40
41 def _get_pip(venv_path):
42   if sys.platform[:3] == "win":
43     return venv_path / 'Scripts' / 'pip.exe'
44   return venv_path / 'bin' / 'pip'
45
46 def _get_virtualenv_site_packages(venv_path, pyver):
47   if sys.platform[:3] == "win":
48     return venv_path / 'Lib' / 'site-packages'
49   return venv_path / 'lib' / f'python{pyver[0]}.{pyver[1]}' / 'site-packages'
50
51 def _initialize_black_env(upgrade=False):
52   pyver = sys.version_info[:3]
53   if pyver < (3, 6, 2):
54     print("Sorry, Black requires Python 3.6.2+ to run.")
55     return False
56
57   from pathlib import Path
58   import subprocess
59   import venv
60   virtualenv_path = Path(vim.eval("g:black_virtualenv")).expanduser()
61   virtualenv_site_packages = str(_get_virtualenv_site_packages(virtualenv_path, pyver))
62   first_install = False
63   if not virtualenv_path.is_dir():
64     print('Please wait, one time setup for Black.')
65     _executable = sys.executable
66     _base_executable = getattr(sys, "_base_executable", _executable)
67     try:
68       executable = str(_get_python_binary(Path(sys.exec_prefix)))
69       sys.executable = executable
70       sys._base_executable = executable
71       print(f'Creating a virtualenv in {virtualenv_path}...')
72       print('(this path can be customized in .vimrc by setting g:black_virtualenv)')
73       venv.create(virtualenv_path, with_pip=True)
74     except Exception:
75       print('Encountered exception while creating virtualenv (see traceback below).')
76       print(f'Removing {virtualenv_path}...')
77       import shutil
78       shutil.rmtree(virtualenv_path)
79       raise
80     finally:
81       sys.executable = _executable
82       sys._base_executable = _base_executable
83     first_install = True
84   if first_install:
85     print('Installing Black with pip...')
86   if upgrade:
87     print('Upgrading Black with pip...')
88   if first_install or upgrade:
89     subprocess.run([str(_get_pip(virtualenv_path)), 'install', '-U', 'black'], stdout=subprocess.PIPE)
90     print('DONE! You are all set, thanks for waiting ✨ 🍰 ✨')
91   if first_install:
92     print('Pro-tip: to upgrade Black in the future, use the :BlackUpgrade command and restart Vim.\n')
93   if virtualenv_site_packages not in sys.path:
94     sys.path.insert(0, virtualenv_site_packages)
95   return True
96
97 if _initialize_black_env():
98   import black
99   import time
100
101 def Black():
102   start = time.time()
103   configs = get_configs()
104   mode = black.FileMode(
105     line_length=configs["line_length"],
106     string_normalization=configs["string_normalization"],
107     is_pyi=vim.current.buffer.name.endswith('.pyi'),
108   )
109   quiet = configs["quiet"]
110
111   buffer_str = '\n'.join(vim.current.buffer) + '\n'
112   try:
113     new_buffer_str = black.format_file_contents(
114       buffer_str,
115       fast=configs["fast"],
116       mode=mode,
117     )
118   except black.NothingChanged:
119     if not quiet:
120       print(f'Already well formatted, good job. (took {time.time() - start:.4f}s)')
121   except Exception as exc:
122     print(exc)
123   else:
124     current_buffer = vim.current.window.buffer
125     cursors = []
126     for i, tabpage in enumerate(vim.tabpages):
127       if tabpage.valid:
128         for j, window in enumerate(tabpage.windows):
129           if window.valid and window.buffer == current_buffer:
130             cursors.append((i, j, window.cursor))
131     vim.current.buffer[:] = new_buffer_str.split('\n')[:-1]
132     for i, j, cursor in cursors:
133       window = vim.tabpages[i].windows[j]
134       try:
135         window.cursor = cursor
136       except vim.error:
137         window.cursor = (len(window.buffer), 0)
138     if not quiet:
139       print(f'Reformatted in {time.time() - start:.4f}s.')
140
141 def get_configs():
142   path_pyproject_toml = black.find_pyproject_toml(vim.eval("fnamemodify(getcwd(), ':t')"))
143   if path_pyproject_toml:
144     toml_config = black.parse_pyproject_toml(path_pyproject_toml)
145   else:
146     toml_config = {}
147
148   return {
149     flag.var_name: flag.cast(toml_config.get(flag.name, vim.eval(flag.vim_rc_name)))
150     for flag in FLAGS
151   }
152
153
154 def BlackUpgrade():
155   _initialize_black_env(upgrade=True)
156
157 def BlackVersion():
158   print(f'Black, version {black.__version__} on Python {sys.version}.')
159
160 EndPython3
161
162 function black#Black()
163   :py3 Black()
164 endfunction
165
166 function black#BlackUpgrade()
167   :py3 BlackUpgrade()
168 endfunction
169
170 function black#BlackVersion()
171   :py3 BlackVersion()
172 endfunction