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"""Nice output for Black.
The double calls are for patching purposes in tests.
"""
import json
import tempfile
from typing import Any, Optional
from click import echo, style
from mypy_extensions import mypyc_attr
@mypyc_attr(patchable=True)
def _out(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
if message is not None:
if "bold" not in styles:
styles["bold"] = True
message = style(message, **styles)
echo(message, nl=nl, err=True)
@mypyc_attr(patchable=True)
def _err(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
if message is not None:
if "fg" not in styles:
styles["fg"] = "red"
message = style(message, **styles)
echo(message, nl=nl, err=True)
@mypyc_attr(patchable=True)
def out(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
_out(message, nl=nl, **styles)
def err(message: Optional[str] = None, nl: bool = True, **styles: Any) -> None:
_err(message, nl=nl, **styles)
def ipynb_diff(a: str, b: str, a_name: str, b_name: str) -> str:
"""Return a unified diff string between each cell in notebooks `a` and `b`."""
a_nb = json.loads(a)
b_nb = json.loads(b)
diff_lines = [
diff(
"".join(a_nb["cells"][cell_number]["source"]) + "\n",
"".join(b_nb["cells"][cell_number]["source"]) + "\n",
f"{a_name}:cell_{cell_number}",
f"{b_name}:cell_{cell_number}",
)
for cell_number, cell in enumerate(a_nb["cells"])
if cell["cell_type"] == "code"
]
return "".join(diff_lines)
def diff(a: str, b: str, a_name: str, b_name: str) -> str:
"""Return a unified diff string between strings `a` and `b`."""
import difflib
a_lines = a.splitlines(keepends=True)
b_lines = b.splitlines(keepends=True)
diff_lines = []
for line in difflib.unified_diff(
a_lines, b_lines, fromfile=a_name, tofile=b_name, n=5
):
# Work around https://bugs.python.org/issue2142
# See:
# https://www.gnu.org/software/diffutils/manual/html_node/Incomplete-Lines.html
if line[-1] == "\n":
diff_lines.append(line)
else:
diff_lines.append(line + "\n")
diff_lines.append("\\ No newline at end of file\n")
return "".join(diff_lines)
def color_diff(contents: str) -> str:
"""Inject the ANSI color codes to the diff."""
lines = contents.split("\n")
for i, line in enumerate(lines):
if line.startswith("+++") or line.startswith("---"):
line = "\033[1m" + line + "\033[0m" # bold, reset
elif line.startswith("@@"):
line = "\033[36m" + line + "\033[0m" # cyan, reset
elif line.startswith("+"):
line = "\033[32m" + line + "\033[0m" # green, reset
elif line.startswith("-"):
line = "\033[31m" + line + "\033[0m" # red, reset
lines[i] = line
return "\n".join(lines)
@mypyc_attr(patchable=True)
def dump_to_file(*output: str, ensure_final_newline: bool = True) -> str:
"""Dump `output` to a temporary file. Return path to the file."""
with tempfile.NamedTemporaryFile(
mode="w", prefix="blk_", suffix=".log", delete=False, encoding="utf8"
) as f:
for lines in output:
f.write(lines)
if ensure_final_newline and lines and lines[-1] != "\n":
f.write("\n")
return f.name
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