add new diff mode

WIP

WIP

WIP

WIP

WIP

WIP

WIP

1 files changed, 189 insertions, 0 deletions

diff --git a/pkg/gui/diffing.go b/pkg/gui/diffing.go
new file mode 100644
index 000000000..a42b6b335
--- /dev/null
+++ b/pkg/gui/diffing.go
@@ -0,0 +1,189 @@
+package gui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/jesseduffield/gocui"
+	"github.com/jesseduffield/lazygit/pkg/commands"
+)
+
+func (gui *Gui) inDiffMode() bool {
+	return gui.State.Diff.Ref != ""
+}
+
+func (gui *Gui) exitDiffMode() error {
+	gui.State.Diff = DiffState{}
+	return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+}
+
+func (gui *Gui) renderDiff() error {
+	filterArg := ""
+	if gui.inFilterMode() {
+		filterArg = fmt.Sprintf(" -- %s", gui.State.FilterPath)
+	}
+
+	cmd := gui.OSCommand.ExecutableFromString(
+		fmt.Sprintf("git diff --color %s %s", gui.diffStr(), filterArg),
+	)
+	if err := gui.newPtyTask("main", cmd); err != nil {
+		gui.Log.Error(err)
+	}
+	return nil
+}
+
+// currentDiffTerminals returns the current diff terminals of the currently selected item.
+// in the case of a branch it returns both the branch and it's upstream name,
+// which becomes an option when you bring up the diff menu, but when you're just
+// flicking through branches it will be using the local branch name.
+func (gui *Gui) currentDiffTerminals() []string {
+	names := []string{}
+	switch gui.g.CurrentView().Name() {
+	case "files":
+		file, err := gui.getSelectedFile()
+		if err == nil {
+			names = append(names, file.Name)
+		}
+	case "commitFiles":
+		file := gui.getSelectedCommitFile()
+		if file != nil {
+			names = append(names, file.Name)
+		}
+	case "commits":
+		var commit *commands.Commit
+		switch gui.getCommitsView().Context {
+		case "reflog-commits":
+			commit = gui.getSelectedReflogCommit()
+		case "branch-commits":
+			commit = gui.getSelectedCommit()
+		}
+		if commit != nil {
+			names = append(names, commit.Sha)
+		}
+	case "stash":
+		entry := gui.getSelectedStashEntry()
+		if entry != nil {
+			names = append(names, entry.RefName())
+		}
+	case "branches":
+		switch gui.getBranchesView().Context {
+		case "local-branches":
+			branch := gui.getSelectedBranch()
+			if branch != nil {
+				names = append(names, branch.Name)
+				if branch.UpstreamName != "" {
+					names = append(names, branch.UpstreamName)
+				}
+			}
+		case "remotes":
+			remote := gui.getSelectedRemote()
+			if remote != nil {
+				names = append(names, remote.Name)
+			}
+		case "remote-branches":
+			remoteBranch := gui.getSelectedRemoteBranch()
+			if remoteBranch != nil {
+				names = append(names, remoteBranch.FullName())
+			}
+		case "tags":
+			tag := gui.getSelectedTag()
+			if tag != nil {
+				names = append(names, tag.Name)
+			}
+		}
+	}
+	return names
+}
+
+func (gui *Gui) currentDiffTerminal() string {
+	names := gui.currentDiffTerminals()
+	if len(names) == 0 {
+		return "HEAD"
+	}
+	return names[0]
+}
+
+func (gui *Gui) diffStr() string {
+	left := gui.State.Diff.Ref
+	right := gui.currentDiffTerminal()
+	if gui.State.Diff.Reverse {
+		left, right = right, left
+	}
+	return fmt.Sprintf("%s %s", left, right)
+}
+
+func (gui *Gui) handleCreateDiffingMenuPanel(g *gocui.Gui, v *gocui.View) error {
+	if gui.popupPanelFocused() {
+		return nil
+	}
+
+	names := gui.currentDiffTerminals()
+
+	menuItems := []*menuItem{}
+	for _, name := range names {
+		name := name
+		menuItems = append(menuItems, []*menuItem{
+			{
+				displayString: fmt.Sprintf("%s %s", gui.Tr.SLocalize("diffFrom"), name),
+				onPress: func() error {
+					gui.State.Diff.Ref = name
+					gui.State.Diff.Reverse = false
+					// can scope this down based on current view but too lazy right now
+					return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+				},
+			},
+			{
+				displayString: fmt.Sprintf("%s %s", gui.Tr.SLocalize("diffTo"), name),
+				onPress: func() error {
+					gui.State.Diff.Ref = name
+					gui.State.Diff.Reverse = true
+					// can scope this down based on current view but too lazy right now
+					return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+				},
+			},
+		}...)
+	}
+
+	menuItems = append(menuItems, []*menuItem{
+		{
+			displayString: gui.Tr.SLocalize("enterRefToDiffFrom"),
+			onPress: func() error {
+				return gui.createPromptPanel(gui.g, v, gui.Tr.SLocalize("enteRefName"), "", func(g *gocui.Gui, promptView *gocui.View) error {
+					gui.State.Diff.Ref = strings.TrimSpace(promptView.Buffer())
+					gui.State.Diff.Reverse = false
+					return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+				})
+			},
+		},
+		{
+			displayString: gui.Tr.SLocalize("enterRefToDiffTo"),
+			onPress: func() error {
+				return gui.createPromptPanel(gui.g, v, gui.Tr.SLocalize("enteRefName"), "", func(g *gocui.Gui, promptView *gocui.View) error {
+					gui.State.Diff.Ref = strings.TrimSpace(promptView.Buffer())
+					gui.State.Diff.Reverse = true
+					return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+				})
+			},
+		},
+	}...)
+
+	menuItems = append(menuItems, &menuItem{
+		displayString: gui.Tr.SLocalize("swapDiff"),
+		onPress: func() error {
+			gui.State.Diff.Reverse = !gui.State.Diff.Reverse
+			return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+		},
+	})
+
+	if gui.inDiffMode() {
+		menuItems = append(menuItems, &menuItem{
+			displayString: gui.Tr.SLocalize("exitDiffMode"),
+			onPress: func() error {
+				gui.State.Diff = DiffState{}
+				return gui.refreshSidePanels(refreshOptions{mode: ASYNC})
+			},
+		})
+	}
+
+	return gui.createMenu(gui.Tr.SLocalize("DiffingMenuTitle"), menuItems, createMenuOptions{showCancel: true})
+}