Diff view

In plain words

Shows what changed in a file: new lines in green, deleted lines in red.

ui.diff_view(diff) shows an edit: the file’s name, then the lines that changed (added in green, removed in red) with two lines of context around each change; changes far apart are split by ⋯. diff is a dict with path, old and new, the whole texts before and after, and max_lines limits how many lines show before … N more lines. It is what a Tool call shows for the edits it made.

ui.diff_view · Category: AI agents · Full reference →

Preview

Code

old = "def save(path):\n    data = load()\n    write(path, data)\n    return True\n"
new = "def save(path, data):\n    write(path, data)\n    log(path)\n    return True\n"
pz.container(ui.diff_view({"path": "app/storage.py", "old": old, "new": new}), width=420)

New

This component was added recently. Tell us how it works for you in the issue tracker.

When to use

• To show what an agent or a tool changed in a file.
• To review a change before saving it, next to Keep and Reject buttons.
• For the counts alone (+12 −3), use Diff stat.

Usage

import pyzed as pz
from pyzed import ui

old = "def save(path):\n    data = load()\n    write(path, data)\n    return True\n"
new = "def save(path, data):\n    write(path, data)\n    log(path)\n    return True\n"
pz.container(ui.diff_view({"path": "app/storage.py", "old": old, "new": new}), width=420)

Variants

About these captures

Each capture is recorded by pyzed itself, off-screen at 2x, in One Dark or One Light to match this site’s theme, and cropped to the component so it shows at its real size. The pointer hovers, presses or types into it; a component that does not react to the pointer cycles through a few themes. With reduced motion you see the first frame. Open Code under a capture to see the snippet that draws it; free names such as on_save stand for your own callbacks.

Content

Two lines of context surround each change; changes further apart are split by ⋯.

Changed lines

Code

pz.container(ui.diff_view({"path": "app.py", "old": "x = 1\ny = 2\n", "new": "x = 10\ny = 2\n"}),
             width=300)

New file

Code

pz.container(ui.diff_view({"path": "main.py", "old": "", "new": "import pyzed as pz\n\npz.run(App)\n"}),
             width=300)

Removed lines

Code

pz.container(ui.diff_view({"path": "todo.txt", "old": "milk\neggs\nbread\n", "new": "milk\n"}),
             width=300)

Changes far apart

Code

old = "".join(f"line {i}\n" for i in range(1, 13))
new = old.replace("line 2\n", "line two\n").replace("line 11\n", "")
pz.container(ui.diff_view({"path": "notes.txt", "old": old, "new": new}), width=300)

max_lines=4

Code

new = "".join(f"item {i}\n" for i in range(1, 11))
pz.container(ui.diff_view({"path": "list.txt", "old": "", "new": new}, max_lines=4), width=300)

Events

Diff view has no events of its own: it shows what you give it. Like every widget it also has the 18 common events (click, double_click, right_click, mouse_enter, drag, key_down, resize…), attached with .on(...): see Events and Events of every component.

Properties and API

ui.diff_view

diff_view(diff, *, theme=None, max_lines=120)

An edit as Zed shows it in a thread: the file’s name, then the changed lines (green added, red removed) with a few lines around them.

Property	Default	Description
diff	required	A dict with path, old and new (the texts before and after).
theme	None	Theme.
max_lines	120	Lines shown before … N more lines.

Full reference →

Related

Tool callOne step of an AI agent: what it did, its result, and Allow or Deny.

Diff stat`+12 −3` with GitHub-style blocks.

Edits barThe files an agent changed, with Keep all and Reject all.