refactor to only have one context per view

pkg/gui/controllers/context_lines_controller.go

@@ -0,0 +1,116 @@
+package controllers
+
+import (
+	"errors"
+
+	"github.com/jesseduffield/lazygit/pkg/gui/context"
+	"github.com/jesseduffield/lazygit/pkg/gui/types"
+	"github.com/samber/lo"
+)
+
+// This controller lets you change the context size for diffs. The 'context' in 'context size' refers to the conventional meaning of the word 'context' in a diff, as opposed to lazygit's own idea of a 'context'.
+
+var CONTEXT_KEYS_SHOWING_DIFFS = []types.ContextKey{
+	context.FILES_CONTEXT_KEY,
+	context.COMMIT_FILES_CONTEXT_KEY,
+	context.STASH_CONTEXT_KEY,
+	context.LOCAL_COMMITS_CONTEXT_KEY,
+	context.SUB_COMMITS_CONTEXT_KEY,
+	context.STAGING_MAIN_CONTEXT_KEY,
+	context.STAGING_SECONDARY_CONTEXT_KEY,
+	context.PATCH_BUILDING_MAIN_CONTEXT_KEY,
+	context.PATCH_BUILDING_SECONDARY_CONTEXT_KEY,
+}
+
+type ContextLinesController struct {
+	baseController
+	*controllerCommon
+}
+
+var _ types.IController = &ContextLinesController{}
+
+func NewContextLinesController(
+	common *controllerCommon,
+) *ContextLinesController {
+	return &ContextLinesController{
+		baseController:   baseController{},
+		controllerCommon: common,
+	}
+}
+
+func (self *ContextLinesController) GetKeybindings(opts types.KeybindingsOpts) []*types.Binding {
+	bindings := []*types.Binding{
+		{
+			Key:         opts.GetKey(opts.Config.Universal.IncreaseContextInDiffView),
+			Handler:     self.Increase,
+			Description: self.c.Tr.IncreaseContextInDiffView,
+		},
+		{
+			Key:         opts.GetKey(opts.Config.Universal.DecreaseContextInDiffView),
+			Handler:     self.Decrease,
+			Description: self.c.Tr.DecreaseContextInDiffView,
+		},
+	}
+
+	return bindings
+}
+
+func (self *ContextLinesController) Context() types.Context {
+	return nil
+}
+
+func (self *ContextLinesController) Increase() error {
+	if self.isShowingDiff() {
+		if err := self.checkCanChangeContext(); err != nil {
+			return self.c.Error(err)
+		}
+
+		self.c.UserConfig.Git.DiffContextSize = self.c.UserConfig.Git.DiffContextSize + 1
+		return self.applyChange()
+	}
+
+	return nil
+}
+
+func (self *ContextLinesController) Decrease() error {
+	old_size := self.c.UserConfig.Git.DiffContextSize
+
+	if self.isShowingDiff() && old_size > 1 {
+		if err := self.checkCanChangeContext(); err != nil {
+			return self.c.Error(err)
+		}
+
+		self.c.UserConfig.Git.DiffContextSize = old_size - 1
+		return self.applyChange()
+	}
+
+	return nil
+}
+
+func (self *ContextLinesController) applyChange() error {
+	currentContext := self.c.CurrentStaticContext()
+	switch currentContext.GetKey() {
+	// we make an exception for our staging and patch building contexts because they actually need to refresh their state afterwards.
+	case context.PATCH_BUILDING_MAIN_CONTEXT_KEY:
+		return self.c.Refresh(types.RefreshOptions{Scope: []types.RefreshableView{types.PATCH_BUILDING}})
+	case context.STAGING_MAIN_CONTEXT_KEY, context.STAGING_SECONDARY_CONTEXT_KEY:
+		return self.c.Refresh(types.RefreshOptions{Scope: []types.RefreshableView{types.STAGING}})
+	default:
+		return currentContext.HandleRenderToMain()
+	}
+}
+
+func (self *ContextLinesController) checkCanChangeContext() error {
+	if self.git.Patch.PatchManager.Active() {
+		return errors.New(self.c.Tr.CantChangeContextSizeError)
+	}
+
+	return nil
+}
+
+func (self *ContextLinesController) isShowingDiff() bool {
+	return lo.Contains(
+		CONTEXT_KEYS_SHOWING_DIFFS,
+		self.c.CurrentStaticContext().GetKey(),
+	)
+}