bx Fix broken ASCII diagrams → perfect Unicode box-drawing

cat rough.txt | bx fix

Before → After

+----------+       +----------+
|  Frontend |----->|   API    |
+----------+       +----------+
                       |
                       v
                  +---------+
                  |  Auth   |
                  +---------+

┌──────────┐    ┌─────┐
│ Frontend │───▶│ API │
└──────────┘    └─────┘
                   │
                   ▼
               ┌──────┐
               │ Auth │
               └──────┘

Features

• Parses rough ASCII & Unicode — tolerates misaligned corners, overflowing labels, broken edges
• Preserves your layout — fixes alignment without rearranging boxes
• 4 box styles — single ┌─┐, rounded ╭─╮, double ╔═╗, bold ┏━┓
• Markdown mode — fix diagrams inside code blocks
• Pipe-friendly — stdin/stdout, composes with other tools
• Single binary — Go, no runtime dependencies

Install

go install github.com/justEstif/bx@latest

mise use -g go:github.com/justEstif/bx@latest
mise reshim

git clone https://github.com/justEstif/bx.git
cd bx && go build -o bx .

Usage

# Fix from stdin
cat rough.txt | bx fix

# Choose style: single (default), rounded, double, bold
echo '...' | bx fix --style rounded

# Fix diagrams inside markdown code blocks
bx fix --markdown README.md

# Fix a file directly
bx fix diagram.txt

Styles

┌──────┐
│ Auth │
└──────┘

╭──────╮
│ Auth │
╰──────╯

╔══════╗
║ Auth ║
╚══════╝

┏━━━━━━┓
┃ Auth ┃
┗━━━━━━┛

Why?

LLMs and humans constantly produce broken ASCII diagrams — misaligned corners, off-by-one edges, inconsistent characters. bx takes that mess and snaps everything into geometrically perfect Unicode box-drawing. Works in terminals and markdown code blocks.