graph-easy

A Python port of Graph::Easy, the Perl tool that lays out directed/undirected graphs and renders them as ASCII art (box-and-wire diagrams rendered in the terminal).

This project faithfully translates the original Perl implementation to Python, in order to provide the same functionality to Python users / as a native Python library and command-line tool.

Provenance & License

Original: Graph::Easy, Copyright (C) 2004 - 2008 by Tels (http://bloodgate.com/).
Upstream repository: https://github.com/ironcamel/Graph-Easy
This port is licensed under the GNU General Public License, version 2 or (at your option) any later version — the same license as the original Graph::Easy, because a port is a derivative work.

See LICENSE for the full LGPL/ GPL text.

Third-party color schemes

This product includes color specifications and designs developed by Cynthia Brewer (http://colorbrewer.org/), used under the Apache-Style Software License for ColorBrewer Color Schemes v1.1, © 2002 Cynthia Brewer, Mark Harrower, and The Pennsylvania State University. See the header of the original Graph::Easy::Attributes for the full notice.

Status

Actively-developed port. Currently implemented:

DSL parser: [ label ]/bare nodes, --> <-- <--> -- arrows, labelled edges (-- label -->), multiline labels (\n), comments
Layout engine: longest-path layering with orthogonal edge routing — chains, branches, merges and cycles all render correctly; independent components stack as separate diagrams
Edge line styles (faithful to upstream Parser::_edge_style): -- solid, .. dotted, == double, ~~ wave, ## bold, .-/..- dot-dash
Two output charsets: Unicode box-drawing by default (┌──┐ ──> ══ ║ ·), plain ASCII via --ascii

The heavier automatic layout engine (Graph::Easy::Layout grid solver) is a follow-up milestone.

Usage

$ printf '[ Bonn ] --> [ Berlin ] --> [ Hamburg ]\n' | graph-easy
┌──────┐         ┌────────┐         ┌─────────┐
│ Bonn │ ───────▶│ Berlin │ ───────▶│ Hamburg │
└──────┘         └────────┘         └─────────┘

Colours from fill/color attributes are on by default; use --no-color to disable, or --color auto to enable only on a TTY.

# plain-ASCII output
$ printf '[ A ] ..> [ B ]\n' | graph-easy --ascii
+---+         +---+
| A | .......>| B |
+---+         +---+

Development

$ python -m venv .venv && source .venv/bin/activate
$ pip install -e '.[dev]'
$ pytest

Acknowledgments

Thanks to Tels and the Graph::Easy contributors whose careful layout and rendering work this port builds upon.

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