jesseduffield.lazygit/pkg/gocui
Stefan Haller af147d49f7 Lock the view while reading viewLines on mouse move
onMouseMove (and findHyperlinkAt, which it calls) read v.viewLines without
holding writeMutex, unlike every other reader. They run on the event-handling
goroutine, so a re-render on the task goroutine can shrink or rebuild viewLines
between onMouseMove's bounds check and findHyperlinkAt's indexing, causing an
out-of-range panic (observed: "index out of range [60] with length 0" while
hovering during a diff re-render).

Take writeMutex for the duration, like the other viewLines readers do, so the
check and the access see the same slice. Pre-existing, but the off-screen
re-render rebuilds viewLines on the task goroutine more often, widening the window.
2026-08-08 12:58:59 +02:00
..
attribute.go Bump tcell dependency to v3 2026-04-30 22:14:26 +02:00
AUTHORS Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
block_events_test.go Add gocui primitives to block input during an operation 2026-07-17 12:32:32 +02:00
CHANGES_tcell.md Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
CODE_OF_CONDUCT.md Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
CONTRIBUTING.md Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
doc.go Remove dead Modifier field from keybindings 2026-05-06 09:51:23 +02:00
double_click_test.go Add test for double-click detection 2026-07-31 08:22:35 +02:00
edit.go Convert keybinding fields to Keybinding 2026-05-25 15:32:47 +02:00
escape.go gocui: parse OSC 456 per-line diff metadata and attach it per cell 2026-08-08 12:58:59 +02:00
escape_test.go Materialize cursor-forward escapes as space runs 2026-07-03 18:47:15 +02:00
flush_test.go Make the user-event queue unbounded 2026-07-15 10:14:05 +02:00
gui.go Render async content into an off-screen buffer and swap it in 2026-08-08 12:58:59 +02:00
gui_others.go Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
gui_windows.go Fix linter warnings 2026-04-30 14:29:08 +02:00
key.go Move modifiers into Key 2026-04-30 22:22:53 +02:00
keybinding.go Remove dead Modifier field from keybindings 2026-05-06 09:51:23 +02:00
LICENSE Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
mouse_capture_test.go Route mouse events to their originating view during a drag gesture 2026-07-31 08:22:35 +02:00
README.md Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
scrollbar.go Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
scrollbar_test.go Copy gocui files into lazygit repo under pkg/gocui 2026-04-30 14:29:08 +02:00
suspend_test.go Schedule a redraw when resuming from suspension 2026-07-20 14:23:09 +02:00
task.go Exclude view-buffer render tasks from the busy query 2026-07-07 18:09:33 +02:00
task_manager.go Fix a deadlock between task.Done() and the integration test's idle wait 2026-07-15 15:01:04 +02:00
task_manager_test.go Fix a deadlock between task.Done() and the integration test's idle wait 2026-07-15 15:01:04 +02:00
tcell_driver.go Deliver mouse release after a drag 2026-07-31 08:22:35 +02:00
tcell_driver_test.go Deliver mouse release after a drag 2026-07-31 08:22:35 +02:00
text_area.go Exclude more commit trailers from auto-wrapping 2026-08-02 19:22:34 +02:00
text_area_test.go Exclude more commit trailers from auto-wrapping 2026-08-02 19:22:34 +02:00
user_event_queue_test.go Log the user-event queue's high-water mark 2026-07-15 10:14:05 +02:00
view.go Lock the view while reading viewLines on mouse move 2026-08-08 12:58:59 +02:00
view_test.go Add gocui accessors for scanning a loading off-screen render 2026-08-08 12:58:59 +02:00

GOCUI - Go Console User Interface

CircleCI CodeCov Go Report Card GolangCI GoDoc GitHub tag (latest SemVer)

Minimalist Go package aimed at creating Console User Interfaces. A community fork based on the amazing work of jroimartin

Features

  • Minimalist API.
  • Views (the "windows" in the GUI) implement the interface io.ReadWriter.
  • Support for overlapping views.
  • The GUI can be modified at runtime (concurrent-safe).
  • Global and view-level keybindings.
  • Mouse support.
  • Colored text.
  • Customizable editing mode.
  • Easy to build reusable widgets, complex layouts...

About fork

This fork has many improvements over the original work from jroimartin.

  • Written ontop of TCell
  • Better wide character support
  • Support for 1 Line height views
  • Better support for running in docker container
  • Customize frame colors
  • Improved code comments and quality
  • Many small improvements
  • Change Visibility of views

For information about this org see: awesome-gocui/about.

Installation

Execute:

$ go get github.com/awesome-gocui/gocui

Documentation

Execute:

$ go doc github.com/awesome-gocui/gocui

Or visit godoc.org to read it online.

Example

See the _example folder for more examples

package main

import (
	"fmt"
	"log"

	"github.com/awesome-gocui/gocui"
)

func main() {
	g, err := gocui.NewGui(gocui.OutputNormal, true)
	if err != nil {
		log.Panicln(err)
	}
	defer g.Close()

	g.SetManagerFunc(layout)

	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
		log.Panicln(err)
	}

	if err := g.MainLoop(); err != nil && !gocui.IsQuit(err) {
		log.Panicln(err)
	}
}

func layout(g *gocui.Gui) error {
	maxX, maxY := g.Size()
	if v, err := g.SetView("hello", maxX/2-7, maxY/2, maxX/2+7, maxY/2+2, 0); err != nil {
		if !gocui.IsUnknownView(err) {
			return err
		}

		if _, err := g.SetCurrentView("hello"); err != nil {
			return err
		}

		fmt.Fprintln(v, "Hello world!")
	}

	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}

Screenshots

r2cui

_examples/demo.go

_examples/dynamic.go

Projects using gocui

  • komanda-cli: IRC Client For Developers.
  • vuls: Agentless vulnerability scanner for Linux/FreeBSD.
  • wuzz: Interactive cli tool for HTTP inspection.
  • httplab: Interactive web server.
  • domainr: Tool that checks the availability of domains based on keywords.
  • gotime: Time tracker for projects and tasks.
  • claws: Interactive command line client for testing websockets.
  • terminews: Terminal based RSS reader.
  • diagram: Tool to convert ascii arts into hand drawn diagrams.
  • pody: CLI app to manage Pods in a Kubernetes cluster.
  • kubexp: Kubernetes client.
  • kcli: Tool for inspecting kafka topics/partitions/messages.
  • fac: git merge conflict resolver
  • jsonui: Interactive JSON explorer for your terminal.
  • cointop: Interactive terminal based UI application for tracking cryptocurrencies.
  • lazygit: simple terminal UI for git commands.
  • lazydocker: The lazier way to manage everything docker.

Note: if your project is not listed here, let us know! :)