250 lines
8.7 KiB
Python
250 lines
8.7 KiB
Python
"""Helper functions for writing to terminals and files."""
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import os
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import shutil
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import sys
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from typing import final
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from typing import Literal
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from typing import Optional
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from typing import Sequence
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from typing import TextIO
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from .wcwidth import wcswidth
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# This code was initially copied from py 1.8.1, file _io/terminalwriter.py.
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def get_terminal_width() -> int:
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width, _ = shutil.get_terminal_size(fallback=(80, 24))
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# The Windows get_terminal_size may be bogus, let's sanify a bit.
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if width < 40:
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width = 80
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return width
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def should_do_markup(file: TextIO) -> bool:
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if os.environ.get("PY_COLORS") == "1":
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return True
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if os.environ.get("PY_COLORS") == "0":
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return False
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if os.environ.get("NO_COLOR"):
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return False
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if os.environ.get("FORCE_COLOR"):
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return True
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return (
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hasattr(file, "isatty") and file.isatty() and os.environ.get("TERM") != "dumb"
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)
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@final
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class TerminalWriter:
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_esctable = dict(
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black=30,
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red=31,
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green=32,
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yellow=33,
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blue=34,
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purple=35,
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cyan=36,
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white=37,
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Black=40,
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Red=41,
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Green=42,
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Yellow=43,
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Blue=44,
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Purple=45,
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Cyan=46,
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White=47,
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bold=1,
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light=2,
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blink=5,
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invert=7,
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)
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def __init__(self, file: Optional[TextIO] = None) -> None:
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if file is None:
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file = sys.stdout
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if hasattr(file, "isatty") and file.isatty() and sys.platform == "win32":
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try:
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import colorama
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except ImportError:
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pass
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else:
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file = colorama.AnsiToWin32(file).stream
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assert file is not None
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self._file = file
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self.hasmarkup = should_do_markup(file)
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self._current_line = ""
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self._terminal_width: Optional[int] = None
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self.code_highlight = True
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@property
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def fullwidth(self) -> int:
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if self._terminal_width is not None:
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return self._terminal_width
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return get_terminal_width()
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@fullwidth.setter
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def fullwidth(self, value: int) -> None:
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self._terminal_width = value
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@property
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def width_of_current_line(self) -> int:
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"""Return an estimate of the width so far in the current line."""
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return wcswidth(self._current_line)
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def markup(self, text: str, **markup: bool) -> str:
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for name in markup:
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if name not in self._esctable:
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raise ValueError(f"unknown markup: {name!r}")
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if self.hasmarkup:
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esc = [self._esctable[name] for name, on in markup.items() if on]
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if esc:
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text = "".join("\x1b[%sm" % cod for cod in esc) + text + "\x1b[0m"
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return text
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def sep(
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self,
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sepchar: str,
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title: Optional[str] = None,
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fullwidth: Optional[int] = None,
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**markup: bool,
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) -> None:
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if fullwidth is None:
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fullwidth = self.fullwidth
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# The goal is to have the line be as long as possible
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# under the condition that len(line) <= fullwidth.
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if sys.platform == "win32":
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# If we print in the last column on windows we are on a
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# new line but there is no way to verify/neutralize this
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# (we may not know the exact line width).
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# So let's be defensive to avoid empty lines in the output.
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fullwidth -= 1
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if title is not None:
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# we want 2 + 2*len(fill) + len(title) <= fullwidth
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# i.e. 2 + 2*len(sepchar)*N + len(title) <= fullwidth
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# 2*len(sepchar)*N <= fullwidth - len(title) - 2
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# N <= (fullwidth - len(title) - 2) // (2*len(sepchar))
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N = max((fullwidth - len(title) - 2) // (2 * len(sepchar)), 1)
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fill = sepchar * N
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line = f"{fill} {title} {fill}"
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else:
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# we want len(sepchar)*N <= fullwidth
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# i.e. N <= fullwidth // len(sepchar)
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line = sepchar * (fullwidth // len(sepchar))
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# In some situations there is room for an extra sepchar at the right,
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# in particular if we consider that with a sepchar like "_ " the
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# trailing space is not important at the end of the line.
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if len(line) + len(sepchar.rstrip()) <= fullwidth:
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line += sepchar.rstrip()
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self.line(line, **markup)
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def write(self, msg: str, *, flush: bool = False, **markup: bool) -> None:
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if msg:
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current_line = msg.rsplit("\n", 1)[-1]
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if "\n" in msg:
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self._current_line = current_line
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else:
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self._current_line += current_line
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msg = self.markup(msg, **markup)
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try:
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self._file.write(msg)
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except UnicodeEncodeError:
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# Some environments don't support printing general Unicode
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# strings, due to misconfiguration or otherwise; in that case,
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# print the string escaped to ASCII.
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# When the Unicode situation improves we should consider
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# letting the error propagate instead of masking it (see #7475
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# for one brief attempt).
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msg = msg.encode("unicode-escape").decode("ascii")
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self._file.write(msg)
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if flush:
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self.flush()
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def line(self, s: str = "", **markup: bool) -> None:
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self.write(s, **markup)
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self.write("\n")
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def flush(self) -> None:
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self._file.flush()
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def _write_source(self, lines: Sequence[str], indents: Sequence[str] = ()) -> None:
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"""Write lines of source code possibly highlighted.
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Keeping this private for now because the API is clunky. We should discuss how
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to evolve the terminal writer so we can have more precise color support, for example
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being able to write part of a line in one color and the rest in another, and so on.
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"""
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if indents and len(indents) != len(lines):
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raise ValueError(
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"indents size ({}) should have same size as lines ({})".format(
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len(indents), len(lines)
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)
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)
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if not indents:
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indents = [""] * len(lines)
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source = "\n".join(lines)
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new_lines = self._highlight(source).splitlines()
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for indent, new_line in zip(indents, new_lines):
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self.line(indent + new_line)
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def _highlight(
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self, source: str, lexer: Literal["diff", "python"] = "python"
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) -> str:
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"""Highlight the given source if we have markup support."""
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from _pytest.config.exceptions import UsageError
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if not source or not self.hasmarkup or not self.code_highlight:
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return source
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try:
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from pygments.formatters.terminal import TerminalFormatter
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if lexer == "python":
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from pygments.lexers.python import PythonLexer as Lexer
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elif lexer == "diff":
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from pygments.lexers.diff import DiffLexer as Lexer
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import pygments.util
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from pygments import highlight
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except ImportError:
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return source
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else:
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try:
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highlighted: str = highlight(
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source,
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Lexer(),
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TerminalFormatter(
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bg=os.getenv("PYTEST_THEME_MODE", "dark"),
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style=os.getenv("PYTEST_THEME"),
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),
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)
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# pygments terminal formatter may add a newline when there wasn't one.
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# We don't want this, remove.
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if highlighted[-1] == "\n" and source[-1] != "\n":
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highlighted = highlighted[:-1]
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# Some lexers will not set the initial color explicitly
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# which may lead to the previous color being propagated to the
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# start of the expression, so reset first.
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return "\x1b[0m" + highlighted
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except pygments.util.ClassNotFound:
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raise UsageError(
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"PYTEST_THEME environment variable had an invalid value: '{}'. "
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"Only valid pygment styles are allowed.".format(
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os.getenv("PYTEST_THEME")
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)
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)
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except pygments.util.OptionError:
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raise UsageError(
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"PYTEST_THEME_MODE environment variable had an invalid value: '{}'. "
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"The only allowed values are 'dark' and 'light'.".format(
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os.getenv("PYTEST_THEME_MODE")
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)
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)
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