undo via rebase

pkg/gui/keybindings.go

@@ -313,6 +313,13 @@ func (gui *Gui) GetInitialKeybindings() []*Binding {
 			Modifier: gocui.ModNone,
 			Handler:  gui.handleCreateOptionsMenu,
 		},
+		{
+			ViewName:    "",
+			Key:         gui.getKey("main.undo"),
+			Modifier:    gocui.ModNone,
+			Handler:     gui.reflogUndo,
+			Description: gui.Tr.SLocalize("undoReflog"),
+		},
 		{
 			ViewName:    "status",
 			Key:         gui.getKey("universal.edit"),

pkg/gui/reflog_panel.go

@@ -1,6 +1,9 @@
 package gui
 
 import (
+	"regexp"
+
+	"github.com/davecgh/go-spew/spew"
 	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/commands"
 	"github.com/jesseduffield/lazygit/pkg/gui/presentation"
@@ -99,3 +102,55 @@ func (gui *Gui) handleCreateReflogResetMenu(g *gocui.Gui, v *gocui.View) error {
 
 	return gui.createResetMenu(commit.Sha)
 }
+
+type reflogAction struct {
+	regexStr string
+	action   func(match []string, commitSha string, prevCommitSha string) (bool, error)
+}
+
+func (gui *Gui) reflogUndo(g *gocui.Gui, v *gocui.View) error {
+	reflogActions := []reflogAction{
+		{
+			regexStr: `^checkout: moving from ([\S]+)`,
+			action: func(match []string, commitSha string, prevCommitSha string) (bool, error) {
+				if len(match) <= 1 {
+					return false, nil
+				}
+				return true, gui.handleCheckoutRef(match[1])
+			},
+		},
+		{
+			regexStr: `^commit|^rebase -i \(start\)`,
+			action: func(match []string, commitSha string, prevCommitSha string) (bool, error) {
+				return true, gui.resetToRef(prevCommitSha, "hard")
+			},
+		},
+	}
+
+	for i, reflogCommit := range gui.State.ReflogCommits {
+		for _, action := range reflogActions {
+			re := regexp.MustCompile(action.regexStr)
+			match := re.FindStringSubmatch(reflogCommit.Name)
+			gui.Log.Warn(action.regexStr)
+			gui.Log.Warn(spew.Sdump(match))
+			if len(match) == 0 {
+				continue
+			}
+			prevCommitSha := ""
+			if len(gui.State.ReflogCommits)-1 >= i+1 {
+				prevCommitSha = gui.State.ReflogCommits[i+1].Sha
+			}
+			gui.Log.Warn(prevCommitSha)
+
+			done, err := action.action(match, reflogCommit.Sha, prevCommitSha)
+			if err != nil {
+				return err
+			}
+			if done {
+				return nil
+			}
+		}
+	}
+
+	return nil
+}

pkg/gui/reset_menu_panel.go

@@ -6,11 +6,39 @@ import (
 	"github.com/fatih/color"
 )
 
+func (gui *Gui) resetToRef(ref string, strength string) error {
+	if err := gui.GitCommand.ResetToCommit(ref, strength); err != nil {
+		return gui.createErrorPanel(gui.g, err.Error())
+	}
+
+	if err := gui.switchCommitsPanelContext("branch-commits"); err != nil {
+		return err
+	}
+
+	gui.State.Panels.Commits.SelectedLine = 0
+	gui.State.Panels.ReflogCommits.SelectedLine = 0
+
+	if err := gui.refreshCommits(gui.g); err != nil {
+		return err
+	}
+	if err := gui.refreshFiles(); err != nil {
+		return err
+	}
+	if err := gui.refreshBranches(gui.g); err != nil {
+		return err
+	}
+	if err := gui.resetOrigin(gui.getCommitsView()); err != nil {
+		return err
+	}
+
+	return gui.handleCommitSelect(gui.g, gui.getCommitsView())
+}
+
 func (gui *Gui) createResetMenu(ref string) error {
 	strengths := []string{"soft", "mixed", "hard"}
 	menuItems := make([]*menuItem, len(strengths))
 	for i, strength := range strengths {
-		innerStrength := strength
+		strength := strength
 		menuItems[i] = &menuItem{
 			displayStrings: []string{
 				fmt.Sprintf("%s reset", strength),
@@ -19,31 +47,7 @@ func (gui *Gui) createResetMenu(ref string) error {
 				),
 			},
 			onPress: func() error {
-				if err := gui.GitCommand.ResetToCommit(ref, innerStrength); err != nil {
-					return gui.createErrorPanel(gui.g, err.Error())
-				}
-
-				if err := gui.switchCommitsPanelContext("branch-commits"); err != nil {
-					return err
-				}
-
-				gui.State.Panels.Commits.SelectedLine = 0
-				gui.State.Panels.ReflogCommits.SelectedLine = 0
-
-				if err := gui.refreshCommits(gui.g); err != nil {
-					return err
-				}
-				if err := gui.refreshFiles(); err != nil {
-					return err
-				}
-				if err := gui.refreshBranches(gui.g); err != nil {
-					return err
-				}
-				if err := gui.resetOrigin(gui.getCommitsView()); err != nil {
-					return err
-				}
-
-				return gui.handleCommitSelect(gui.g, gui.getCommitsView())
+				return gui.resetToRef(ref, strength)
 			},
 		}
 	}

pkg/i18n/english.go

@@ -360,6 +360,9 @@ func addEnglish(i18nObject *i18n.Bundle) error {
 		}, &i18n.Message{
 			ID:    "undo",
 			Other: "undo",
+		}, &i18n.Message{
+			ID:    "undoReflog",
+			Other: "undo (via reflog)",
 		}, &i18n.Message{
 			ID:    "pop",
 			Other: "pop",