Make GitHub PR diff sidebar resizable with a visible drag handle
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// ==UserScript==
// @name Resizable Diff Sidebar (GitHub PR Files)
// @namespace http://tampermonkey.net/
// @version 1.2
// @description Make GitHub PR diff sidebar resizable with a visible drag handle
// @author Louis Yvelin
// @match https://github.com/*/*/pull/*/files
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
const parent = document.querySelector("#diff-layout-component")
const sidebar = document.querySelector("#diff-layout-component > div.Layout-sidebar.overflow-y-auto.hx_Layout--sidebar.diff-sidebar.position-sticky")
if (!parent || !sidebar) return
const handle = document.createElement("div")
handle.style.width = "5px"
handle.style.cursor = "col-resize"
handle.style.position = "absolute"
handle.style.top = "0"
handle.style.bottom = "0"
handle.style.right = "0"
handle.style.zIndex = "9999"
handle.style.background = "rgba(0, 123, 255, 0)"
handle.style.transition = "background 0.2s ease"
sidebar.style.position = "relative"
sidebar.appendChild(handle)
sidebar.addEventListener("mouseenter", () => {
if (!isDragging) handle.style.background = "rgba(0, 123, 255, 0.5)"
})
sidebar.addEventListener("mouseleave", () => {
if (!isDragging) handle.style.background = "rgba(0, 123, 255, 0)"
})
let isDragging = false
handle.addEventListener("mousedown", e => {
e.preventDefault()
isDragging = true
document.body.style.userSelect = "none"
handle.style.background = "rgba(0, 123, 255, 0.9)"
})
document.addEventListener("mousemove", e => {
if (!isDragging) return
const rect = parent.getBoundingClientRect()
const newWidth = e.clientX - rect.left
parent.style.setProperty("--Layout-sidebar-width", `${newWidth}px`)
})
document.addEventListener("mouseup", () => {
if (isDragging) {
isDragging = false
document.body.style.userSelect = ""
handle.style.background = "rgba(0, 123, 255, 0.5)"
}
})
})()