Add custom patch demo

README.md

@@ -121,6 +121,14 @@ You can create worktrees to have multiple branches going at once without the nee
 
 ### Rebase magic (custom patches)
 
+You can build a custom patch from an old commit and then remove the patch from the commit, split out a new commit, apply the patch in reverse to the index, and more.
+
+In this example we have a redundant comment that we want to remove from an old commit. We hit `<enter>` on the commit to view its files, then `<enter>` on a file to focus the patch, then `<space>` to add the comment line to our custom patch, and then `ctrl+p` to view the custom patch options; selecting to remove the patch from the current commit.
+
+Learn more in the [Rebase magic Youtube tutorial](https://youtu.be/4XaToVut_hs).
+
+![custom_patch](../assets/demo/custom_patch-compressed.gif)
+
 ## Tutorials
 
 [<img src="https://i.imgur.com/sVEktDn.png">](https://youtu.be/CPLdltN7wgE)

pkg/integration/components/menu_driver.go

@@ -60,6 +60,12 @@ func (self *MenuDriver) LineCount(matcher *IntMatcher) *MenuDriver {
 	return self
 }
 
+func (self *MenuDriver) Wait(milliseconds int) *MenuDriver {
+	self.getViewDriver().Wait(milliseconds)
+
+	return self
+}
+
 func (self *MenuDriver) checkNecessaryChecksCompleted() {
 	if !self.hasCheckedTitle {
 		self.t.Fail("You must check the title of a menu popup by calling Title() before calling Confirm()/Cancel().")

pkg/integration/tests/demo/custom_patch.go

@@ -0,0 +1,76 @@
+package demo
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var usersFileContent = `package main
+
+import "fmt"
+
+func main() {
+	// TODO: verify that this actuall works
+	fmt.Println("hello world")
+}
+`
+
+var CustomPatch = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Remove a line from an old commit",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	IsDemo:       true,
+	SetupConfig: func(cfg *config.AppConfig) {
+		// No idea why I had to use version 2: it should be using my own computer's
+		// font and the one iterm uses is version 3.
+		cfg.UserConfig.Gui.NerdFontsVersion = "2"
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.CreateNCommitsWithRandomMessages(30)
+		shell.NewBranch("feature/user-authentication")
+		shell.EmptyCommit("Add user authentication feature")
+		shell.CreateFileAndAdd("src/users.go", "package main\n")
+		shell.Commit("Fix local session storage")
+		shell.CreateFile("src/authentication.go", "package main")
+		shell.CreateFile("src/session.go", "package main")
+		shell.UpdateFileAndAdd("src/users.go", usersFileContent)
+		shell.EmptyCommit("Stop using shims")
+		shell.UpdateFileAndAdd("src/authentication.go", "package authentication")
+		shell.UpdateFileAndAdd("src/session.go", "package session")
+		shell.Commit("Enhance user authentication feature")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.SetCaptionPrefix("Remove a line from an old commit")
+		t.Wait(1000)
+
+		t.Views().Commits().
+			Focus().
+			NavigateToLine(Contains("Stop using shims")).
+			Wait(1000).
+			PressEnter().
+			Tap(func() {
+				t.Views().CommitFiles().
+					IsFocused().
+					NavigateToLine(Contains("users.go")).
+					Wait(1000).
+					PressEnter().
+					Tap(func() {
+						t.Views().PatchBuilding().
+							IsFocused().
+							NavigateToLine(Contains("TODO")).
+							Wait(500).
+							PressPrimaryAction().
+							PressEscape()
+					}).
+					Press(keys.Universal.CreatePatchOptionsMenu).
+					Tap(func() {
+						t.ExpectPopup().Menu().
+							Title(Equals("Patch options")).
+							Select(Contains("Remove patch from original commit")).
+							Wait(500).
+							Confirm()
+					}).
+					PressEscape()
+			})
+	},
+})

pkg/integration/tests/test_list.go

@@ -94,6 +94,7 @@ var tests = []*components.IntegrationTest{
 	demo.CherryPick,
 	demo.CommitAndPush,
 	demo.CustomCommand,
+	demo.CustomPatch,
 	demo.Filter,
 	demo.InteractiveRebase,
 	demo.NukeWorkingTree,