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6831524090d9a82107146bf8a89ee815fa58d1c9
[etc/vim.git] / src / black / output.py
1 """Nice output for Black.
2
3 The double calls are for patching purposes in tests.
4 """
5
6 from typing import Any, Optional
7 from mypy_extensions import mypyc_attr
8 import tempfile
9
10 from click import echo, style
11
12
13 def _out(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
14     if message is not None:
15         if "bold" not in styles:
16             styles["bold"] = True
17         message = style(message, **styles)
18     echo(message, nl=nl, err=True)
19
20
21 def _err(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
22     if message is not None:
23         if "fg" not in styles:
24             styles["fg"] = "red"
25         message = style(message, **styles)
26     echo(message, nl=nl, err=True)
27
28
29 def out(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
30     _out(message, nl=nl, **styles)
31
32
33 def err(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
34     _err(message, nl=nl, **styles)
35
36
37 def diff(a: str, b: str, a_name: str, b_name: str) -> str:
38     """Return a unified diff string between strings `a` and `b`."""
39     import difflib
40
41     a_lines = [line for line in a.splitlines(keepends=True)]
42     b_lines = [line for line in b.splitlines(keepends=True)]
43     diff_lines = []
44     for line in difflib.unified_diff(
45         a_lines, b_lines, fromfile=a_name, tofile=b_name, n=5
46     ):
47         # Work around https://bugs.python.org/issue2142
48         # See https://www.gnu.org/software/diffutils/manual/html_node/Incomplete-Lines.html
49         if line[-1] == "\n":
50             diff_lines.append(line)
51         else:
52             diff_lines.append(line + "\n")
53             diff_lines.append("\\ No newline at end of file\n")
54     return "".join(diff_lines)
55
56
57 def color_diff(contents: str) -> str:
58     """Inject the ANSI color codes to the diff."""
59     lines = contents.split("\n")
60     for i, line in enumerate(lines):
61         if line.startswith("+++") or line.startswith("---"):
62             line = "\033[1;37m" + line + "\033[0m"  # bold white, reset
63         elif line.startswith("@@"):
64             line = "\033[36m" + line + "\033[0m"  # cyan, reset
65         elif line.startswith("+"):
66             line = "\033[32m" + line + "\033[0m"  # green, reset
67         elif line.startswith("-"):
68             line = "\033[31m" + line + "\033[0m"  # red, reset
69         lines[i] = line
70     return "\n".join(lines)
71
72
73 @mypyc_attr(patchable=True)
74 def dump_to_file(*output: str, ensure_final_newline: bool = True) -> str:
75     """Dump `output` to a temporary file. Return path to the file."""
76     with tempfile.NamedTemporaryFile(
77         mode="w", prefix="blk_", suffix=".log", delete=False, encoding="utf8"
78     ) as f:
79         for lines in output:
80             f.write(lines)
81             if ensure_final_newline and lines and lines[-1] != "\n":
82                 f.write("\n")
83     return f.name