fetching branches without checking out

pkg/gui/branches_panel.go

@@ -7,7 +7,6 @@ import (
 	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/commands"
 	"github.com/jesseduffield/lazygit/pkg/git"
-	"github.com/jesseduffield/lazygit/pkg/utils"
 )
 
 // list panel functions
@@ -31,6 +30,9 @@ func (gui *Gui) handleBranchSelect(g *gocui.Gui, v *gocui.View) error {
 	if err := gui.focusPoint(0, gui.State.Panels.Branches.SelectedLine, v); err != nil {
 		return err
 	}
+	go func() {
+		_ = gui.RenderSelectedBranchUpstreamDifferences()
+	}()
 	go func() {
 		graph, err := gui.GitCommand.GetBranchGraph(branch.Name)
 		if err != nil && strings.HasPrefix(graph, "fatal: ambiguous argument") {
@@ -41,14 +43,23 @@ func (gui *Gui) handleBranchSelect(g *gocui.Gui, v *gocui.View) error {
 	return nil
 }
 
+func (gui *Gui) RenderSelectedBranchUpstreamDifferences() error {
+	// here we tell the selected branch that it is selected.
+	// this is necessary for showing stats on a branch that is selected, because
+	// the displaystring function doesn't have access to gui state to tell if it's selected
+	for i, branch := range gui.State.Branches {
+		branch.Selected = i == gui.State.Panels.Branches.SelectedLine
+	}
+
+	branch := gui.getSelectedBranch()
+	branch.Pushables, branch.Pullables = gui.GitCommand.GetBranchUpstreamDifferenceCount(branch.Name)
+	return gui.renderListPanel(gui.getBranchesView(gui.g), gui.State.Branches)
+}
+
 // gui.refreshStatus is called at the end of this because that's when we can
 // be sure there is a state.Branches array to pick the current branch from
 func (gui *Gui) refreshBranches(g *gocui.Gui) error {
 	g.Update(func(g *gocui.Gui) error {
-		v, err := g.View("branches")
-		if err != nil {
-			panic(err)
-		}
 		builder, err := git.NewBranchListBuilder(gui.Log, gui.GitCommand)
 		if err != nil {
 			return err
@@ -56,16 +67,13 @@ func (gui *Gui) refreshBranches(g *gocui.Gui) error {
 		gui.State.Branches = builder.Build()
 
 		gui.refreshSelectedLine(&gui.State.Panels.Branches.SelectedLine, len(gui.State.Branches))
-
-		v.Clear()
-		list, err := utils.RenderList(gui.State.Branches)
-		if err != nil {
+		if err := gui.resetOrigin(gui.getBranchesView(gui.g)); err != nil {
+			return err
+		}
+		if err := gui.RenderSelectedBranchUpstreamDifferences(); err != nil {
 			return err
 		}
 
-		fmt.Fprint(v, list)
-
-		gui.resetOrigin(v)
 		return gui.refreshStatus(g)
 	})
 	return nil
@@ -74,7 +82,6 @@ func (gui *Gui) refreshBranches(g *gocui.Gui) error {
 func (gui *Gui) handleBranchesNextLine(g *gocui.Gui, v *gocui.View) error {
 	panelState := gui.State.Panels.Branches
 	gui.changeSelectedLine(&panelState.SelectedLine, len(gui.State.Branches), false)
-
 	return gui.handleBranchSelect(gui.g, v)
 }
 
@@ -99,7 +106,10 @@ func (gui *Gui) handleBranchPress(g *gocui.Gui, v *gocui.View) error {
 		if err := gui.createErrorPanel(g, err.Error()); err != nil {
 			return err
 		}
+	} else {
+		gui.State.Panels.Branches.SelectedLine = 0
 	}
+
 	return gui.refreshSidePanels(g)
 }
 
@@ -213,3 +223,37 @@ func (gui *Gui) handleMerge(g *gocui.Gui, v *gocui.View) error {
 	}
 	return nil
 }
+
+func (gui *Gui) handleFastForward(g *gocui.Gui, v *gocui.View) error {
+	branch := gui.getSelectedBranch()
+	if branch == nil {
+		return nil
+	}
+	if branch.Pushables == "" {
+		return nil
+	}
+	if branch.Pushables == "?" {
+		return gui.createErrorPanel(gui.g, "Cannot fast-forward a branch with no upstream")
+	}
+	if branch.Pushables != "0" {
+		return gui.createErrorPanel(gui.g, "Cannot fast-forward a branch with commits to push")
+	}
+	upstream := "origin" // hardcoding for now
+	message := gui.Tr.TemplateLocalize(
+		"Fetching",
+		Teml{
+			"from": fmt.Sprintf("%s/%s", upstream, branch.Name),
+			"to":   branch.Name,
+		},
+	)
+	go func() {
+		_ = gui.createMessagePanel(gui.g, v, "", message)
+		if err := gui.GitCommand.FastForward(branch.Name); err != nil {
+			_ = gui.createErrorPanel(gui.g, err.Error())
+		} else {
+			_ = gui.closeConfirmationPrompt(gui.g)
+			_ = gui.RenderSelectedBranchUpstreamDifferences()
+		}
+	}()
+	return nil
+}