fix: don't color logged exceptions on non-TTY streams; add IPython support (Closes #87, #10)

[18680368135]

Summary

This PR addresses two issues:

Fix #87: Logged exceptions shouldn't contain colour

Problem: When the terminal supports colors (or FORCE_COLOR=1 is set), exceptions logged through the logging module to non-TTY streams (e.g. files, pipes) would contain ANSI escape codes, making them hard to read in editors and log viewers.

Solution: Introduced _stream_supports_color(stream) which checks both the global SUPPORTS_COLOR flag and whether the specific output stream is a TTY. FORCE_COLOR=1 still acts as an explicit override that enables color on all streams (for users who explicitly want colored logs).

Changes to better_exceptions/log.py:

• Added _stream_supports_color(stream) function that checks FORCE_COLOR, SUPPORTS_COLOR, and the stream's TTY status
• Modified _make_logging_format_exception() to accept a stream parameter and use _stream_supports_color() at call time
• Updated patch() to pass the handler's stream to _make_logging_format_exception()

Fix #10: ipython support

Problem: better_exceptions had no integration with IPython/Jupyter notebooks.

Solution: Added better_exceptions.integrations.ipython.install() which hooks into IPython's set_custom_exc API to replace the default traceback formatter with better_exceptions' formatter.

Features:

• Registers a custom exception handler for all BaseException subclasses
• SyntaxError is delegated to IPython's built-in handler (IPython has special formatting for syntax errors)
• Raises clear errors when IPython is not installed or no active shell is found

Usage:

from better_exceptions.integrations.ipython import install
install()

Changes

• better_exceptions/log.py: Added _stream_supports_color() and modified _make_logging_format_exception() to accept stream parameter
• better_exceptions/integrations/ipython.py: New file implementing IPython integration via set_custom_exc
• test/test_logging_color.py: New test file with 5 test cases for issue Logged exceptions shouldn't contain colour #87
• test/test_ipython_integration.py: New test file with 5 test cases for issue ipython support #10
• test_all.sh: Added both new test files to the test suite
• test/output/*.out: Regenerated expected output files for all 12 test configurations
• README.md: Added IPython/Jupyter usage section

Testing

All tests pass locally across all 12 configurations (xterm/vt100/dumb × ascii/UTF-8 × color/nocolor):

$ ./test_all.sh
# All 12 test configurations pass with no diffs

New test files:

• test/test_logging_color.py: Tests non-TTY stream color handling, FORCE_COLOR override, file handler output
• test/test_ipython_integration.py: Tests import, no active shell, mock shell registration, handler formatting, SyntaxError delegation

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally (./test_all.sh passes all 12 configurations)
• Documentation has been updated (README.md updated with IPython usage section)
• No generated build artifacts are committed
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

Closes #87, #10