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import re
import sys
from datetime import datetime
from difflib import unified_diff
from pathlib import Path
from typing import Optional, TextIO
try:
import colorama
except ImportError:
colorama_unavailable = True
else:
colorama_unavailable = False
ADDED_LINE_PATTERN = re.compile(r"\+[^+]")
REMOVED_LINE_PATTERN = re.compile(r"-[^-]")
def format_simplified(import_line: str) -> str:
import_line = import_line.strip()
if import_line.startswith("from "):
import_line = import_line.replace("from ", "")
import_line = import_line.replace(" import ", ".")
elif import_line.startswith("import "):
import_line = import_line.replace("import ", "")
return import_line
def format_natural(import_line: str) -> str:
import_line = import_line.strip()
if not import_line.startswith("from ") and not import_line.startswith("import "):
if "." not in import_line:
return f"import {import_line}"
parts = import_line.split(".")
end = parts.pop(-1)
return f"from {'.'.join(parts)} import {end}"
return import_line
def show_unified_diff(
*,
file_input: str,
file_output: str,
file_path: Optional[Path],
output: Optional[TextIO] = None,
color_output: bool = False,
) -> None:
"""Shows a unified_diff for the provided input and output against the provided file path.
- **file_input**: A string that represents the contents of a file before changes.
- **file_output**: A string that represents the contents of a file after changes.
- **file_path**: A Path object that represents the file path of the file being changed.
- **output**: A stream to output the diff to. If non is provided uses sys.stdout.
- **color_output**: Use color in output if True.
"""
printer = create_terminal_printer(color_output, output)
file_name = "" if file_path is None else str(file_path)
file_mtime = str(
datetime.now() if file_path is None else datetime.fromtimestamp(file_path.stat().st_mtime)
)
unified_diff_lines = unified_diff(
file_input.splitlines(keepends=True),
file_output.splitlines(keepends=True),
fromfile=file_name + ":before",
tofile=file_name + ":after",
fromfiledate=file_mtime,
tofiledate=str(datetime.now()),
)
for line in unified_diff_lines:
printer.diff_line(line)
def ask_whether_to_apply_changes_to_file(file_path: str) -> bool:
answer = None
while answer not in ("yes", "y", "no", "n", "quit", "q"):
answer = input(f"Apply suggested changes to '{file_path}' [y/n/q]? ") # nosec
answer = answer.lower()
if answer in ("no", "n"):
return False
if answer in ("quit", "q"):
sys.exit(1)
return True
def remove_whitespace(content: str, line_separator: str = "\n") -> str:
content = content.replace(line_separator, "").replace(" ", "").replace("\x0c", "")
return content
class BasicPrinter:
ERROR = "ERROR"
SUCCESS = "SUCCESS"
def __init__(self, error: str, success: str, output: Optional[TextIO] = None):
self.output = output or sys.stdout
self.success_message = success
self.error_message = error
def success(self, message: str) -> None:
print(self.success_message.format(success=self.SUCCESS, message=message), file=self.output)
def error(self, message: str) -> None:
print(self.error_message.format(error=self.ERROR, message=message), file=sys.stderr)
def diff_line(self, line: str) -> None:
self.output.write(line)
class ColoramaPrinter(BasicPrinter):
def __init__(self, error: str, success: str, output: Optional[TextIO]):
super().__init__(error, success, output=output)
# Note: this constants are instance variables instead ofs class variables
# because they refer to colorama which might not be installed.
self.ERROR = self.style_text("ERROR", colorama.Fore.RED)
self.SUCCESS = self.style_text("SUCCESS", colorama.Fore.GREEN)
self.ADDED_LINE = colorama.Fore.GREEN
self.REMOVED_LINE = colorama.Fore.RED
@staticmethod
def style_text(text: str, style: Optional[str] = None) -> str:
if style is None:
return text
return style + text + str(colorama.Style.RESET_ALL)
def diff_line(self, line: str) -> None:
style = None
if re.match(ADDED_LINE_PATTERN, line):
style = self.ADDED_LINE
elif re.match(REMOVED_LINE_PATTERN, line):
style = self.REMOVED_LINE
self.output.write(self.style_text(line, style))
def create_terminal_printer(
color: bool, output: Optional[TextIO] = None, error: str = "", success: str = ""
) -> BasicPrinter:
if color and colorama_unavailable:
no_colorama_message = (
"\n"
"Sorry, but to use --color (color_output) the colorama python package is required.\n\n"
"Reference: https://pypi.org/project/colorama/\n\n"
"You can either install it separately on your system or as the colors extra "
"for isort. Ex: \n\n"
"$ pip install isort[colors]\n"
)
print(no_colorama_message, file=sys.stderr)
sys.exit(1)
if not colorama_unavailable:
colorama.init(strip=False)
return (
ColoramaPrinter(error, success, output) if color else BasicPrinter(error, success, output)
)