🦑 hy-fancy-repl

A Hy enhanced REPL.

Compatible with Hy 1.2.0 and later.

Install

$ pip install -U hy-fancy-repl

The REPL

The REPL implements multi-line editing, completion, live input validation, live syntax highlighting, bracket matching, enhanced tracebacks, and interactive matplotlib plots.

$ hy-repl

or

$ hy-fancy-repl

Features

• Multi-line editing with smart indentation
• Syntax highlighting via Pygments
• Bracket matching that ignores brackets inside strings and comments
• Tab completion with Hy's native completer
• Live validation - shows a red 'x' when parentheses are unbalanced
• Enhanced tracebacks - shows syntax-highlighted source snippets
• Interactive matplotlib - async plot updates when available
• History persistence - saved to ~/.hy-history by default

Environment Variables

The REPL's behaviour may be modified with the following environment variables:

Variable	Description	Default
HY_HISTORY	Path to command history file	~/.hy-history
HY_LIVE_COMPLETION	Enable live autocompletion dropdown	unset (off)
HY_PYGMENTS_STYLE	Pygments style for highlighting	lightbulb
HY_VI_MODE	Enable vi line-editing mode	unset (emacs)
HY_TRACEBACK_IGNORE	Comma-separated list of files to hide in tracebacks	sensible defaults

Traceback Filtering

By default, the REPL hides infrastructure files in tracebacks to show your code. The default ignore list includes Hy internals, funcparserlib, and multimethod.

Override with HY_TRACEBACK_IGNORE:

$ HY_TRACEBACK_IGNORE="hy/repl.py,code.py" hy-fancy-repl

Or modify at runtime:

from hy_fancy_repl.repl import TRACEBACK_IGNORE
# TRACEBACK_IGNORE is a tuple of file path suffixes to ignore

Acknowledgements

The REPL uses pygments, prompt-toolkit, colorist, and Hy.

Contributing

See CONTRIBUTING.md for development setup and contribution guidelines.

Docs

Try clicking below.