From cf5cefb2d6bcfd0d403faca5875124eb9b0d7480 Mon Sep 17 00:00:00 2001
From: Jesse Duffield <jessedduffield@gmail.com>
Date: Tue, 19 May 2020 18:29:56 +1000
Subject: [PATCH] allow user to scroll themselves inside merge panel

---
 pkg/gui/global_handlers.go |  8 ++++++++
 pkg/gui/gui.go             |  4 ++++
 pkg/gui/merge_panel.go     | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/pkg/gui/global_handlers.go b/pkg/gui/global_handlers.go
index 5df00d56f..d1947eff1 100644
--- a/pkg/gui/global_handlers.go
+++ b/pkg/gui/global_handlers.go
@@ -65,10 +65,18 @@ func (gui *Gui) scrollDownView(viewName string) error {
 }
 
 func (gui *Gui) scrollUpMain(g *gocui.Gui, v *gocui.View) error {
+	if gui.canScrollMergePanel() {
+		gui.State.Panels.Merging.UserScrolling = true
+	}
+
 	return gui.scrollUpView("main")
 }
 
 func (gui *Gui) scrollDownMain(g *gocui.Gui, v *gocui.View) error {
+	if gui.canScrollMergePanel() {
+		gui.State.Panels.Merging.UserScrolling = true
+	}
+
 	return gui.scrollDownView("main")
 }
 
diff --git a/pkg/gui/gui.go b/pkg/gui/gui.go
index 2fc029b64..735a5465e 100644
--- a/pkg/gui/gui.go
+++ b/pkg/gui/gui.go
@@ -112,6 +112,10 @@ type mergingPanelState struct {
 	ConflictTop   bool
 	Conflicts     []commands.Conflict
 	EditHistory   *stack.Stack
+
+	// UserScrolling tells us if the user has started scrolling through the file themselves
+	// in which case we won't auto-scroll to a conflict.
+	UserScrolling bool
 }
 
 type filePanelState struct {
diff --git a/pkg/gui/merge_panel.go b/pkg/gui/merge_panel.go
index a2346db6e..a70d7fbbb 100644
--- a/pkg/gui/merge_panel.go
+++ b/pkg/gui/merge_panel.go
@@ -69,17 +69,24 @@ func (gui *Gui) coloredConflictFile(content string, conflicts []commands.Conflic
 	return outputBuffer.String(), nil
 }
 
+func (gui *Gui) takeOverScrolling() {
+	gui.State.Panels.Merging.UserScrolling = false
+}
+
 func (gui *Gui) handleSelectTop(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
 	gui.State.Panels.Merging.ConflictTop = true
 	return gui.refreshMergePanel()
 }
 
 func (gui *Gui) handleSelectBottom(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
 	gui.State.Panels.Merging.ConflictTop = false
 	return gui.refreshMergePanel()
 }
 
 func (gui *Gui) handleSelectNextConflict(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
 	if gui.State.Panels.Merging.ConflictIndex >= len(gui.State.Panels.Merging.Conflicts)-1 {
 		return nil
 	}
@@ -88,6 +95,7 @@ func (gui *Gui) handleSelectNextConflict(g *gocui.Gui, v *gocui.View) error {
 }
 
 func (gui *Gui) handleSelectPrevConflict(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
 	if gui.State.Panels.Merging.ConflictIndex <= 0 {
 		return nil
 	}
@@ -160,6 +168,8 @@ func (gui *Gui) handlePopFileSnapshot(g *gocui.Gui, v *gocui.View) error {
 }
 
 func (gui *Gui) handlePickHunk(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
+
 	conflict := gui.State.Panels.Merging.Conflicts[gui.State.Panels.Merging.ConflictIndex]
 	if err := gui.pushFileSnapshot(g); err != nil {
 		return err
@@ -184,6 +194,8 @@ func (gui *Gui) handlePickHunk(g *gocui.Gui, v *gocui.View) error {
 }
 
 func (gui *Gui) handlePickBothHunks(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
+
 	conflict := gui.State.Panels.Merging.Conflicts[gui.State.Panels.Merging.ConflictIndex]
 	if err := gui.pushFileSnapshot(g); err != nil {
 		return err
@@ -256,6 +268,10 @@ func (gui *Gui) catSelectedFile(g *gocui.Gui) (string, error) {
 }
 
 func (gui *Gui) scrollToConflict(g *gocui.Gui) error {
+	if gui.State.Panels.Merging.UserScrolling {
+		return nil
+	}
+
 	panelState := gui.State.Panels.Merging
 	if len(panelState.Conflicts) == 0 {
 		return nil
@@ -283,6 +299,8 @@ func (gui *Gui) renderMergeOptions() error {
 }
 
 func (gui *Gui) handleEscapeMerge(g *gocui.Gui, v *gocui.View) error {
+	gui.takeOverScrolling()
+
 	gui.State.Panels.Merging.EditHistory = stack.New()
 	if err := gui.refreshSidePanels(refreshOptions{scope: []int{FILES}}); err != nil {
 		return err
@@ -316,7 +334,23 @@ func (gui *Gui) handleCompleteMerge() error {
 
 // promptToContinue asks the user if they want to continue the rebase/merge that's in progress
 func (gui *Gui) promptToContinue() error {
+	gui.takeOverScrolling()
+
 	return gui.createConfirmationPanel(gui.g, gui.getFilesView(), true, "continue", gui.Tr.SLocalize("ConflictsResolved"), func(g *gocui.Gui, v *gocui.View) error {
 		return gui.genericMergeCommand("continue")
 	}, nil)
 }
+
+func (gui *Gui) canScrollMergePanel() bool {
+	currentViewName := gui.currentViewName()
+	if currentViewName != "main" {
+		return false
+	}
+
+	file, err := gui.getSelectedFile()
+	if err != nil {
+		return false
+	}
+
+	return file.HasInlineMergeConflicts
+}