Text Diff by langbot-team

# Text Diff

Zero-dependency text/file diff (unified, context, side-by-side, HTML).

```
python scripts/run.py old.txt new.txt
python scripts/run.py old.txt new.txt -m side -w 50
python scripts/run.py old.txt new.txt -m context -n 5
python scripts/run.py old.txt new.txt -m html > diff.html
cat new.txt | python scripts/run.py old.txt -
```

Built on stdlib `difflib`.


---
name: text-diff
display_name: Text Diff
description: "Show a unified, context, side-by-side, or HTML diff between two texts or files. Triggers: diff text, compare files, text diff, side by side diff, unified diff."
---

# Text Diff

Compare two pieces of text or two files and show what changed.

## When to use
The user has two versions of some text/code/file and wants to see the changes —
as a unified patch, a context diff, a side-by-side view, or an HTML report.

## How to use
Run `scripts/run.py` with two inputs:
- `python scripts/run.py old.txt new.txt` — unified diff (default).
- `python scripts/run.py old.txt new.txt -m side` — side-by-side columns.
- `python scripts/run.py old.txt new.txt -m context -n 5` — context diff, 5 lines.
- `python scripts/run.py old.txt new.txt -m html > diff.html` — HTML report.

One input may be stdin via `-`, e.g. `cat new.txt | python scripts/run.py old.txt -`.

## Pitfalls
- Only ONE of the two inputs can be `-` (stdin); using `-` twice errors.
- Exit code is 1 when the files differ, 0 when identical (diff/grep convention).
- Side-by-side truncates long lines to `--width` (default 40) columns.