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package gui
import (
"errors"
"sync"
"github.com/jesseduffield/lazygit/pkg/gui/context"
"github.com/jesseduffield/lazygit/pkg/gui/types"
"github.com/jesseduffield/lazygit/pkg/utils"
"github.com/samber/lo"
)
// This file is for the management of contexts. There is a context stack such that
// for example you might start off in the commits context and then open a menu, putting
// you in the menu context. When contexts are activated/deactivated certain things need
// to happen like showing/hiding views and rendering content.
type ContextMgr struct {
ContextStack []types.Context
sync.RWMutex
gui *Gui
allContexts *context.ContextTree
}
func NewContextMgr(
gui *Gui,
allContexts *context.ContextTree,
) *ContextMgr {
return &ContextMgr{
ContextStack: []types.Context{},
RWMutex: sync.RWMutex{},
gui: gui,
allContexts: allContexts,
}
}
// use when you don't want to return to the original context upon
// hitting escape: you want to go that context's parent instead.
func (self *ContextMgr) Replace(c types.Context) error {
if !c.IsFocusable() {
return nil
}
self.Lock()
if len(self.ContextStack) == 0 {
self.ContextStack = []types.Context{c}
} else {
// replace the last item with the given item
self.ContextStack = append(self.ContextStack[0:len(self.ContextStack)-1], c)
}
defer self.Unlock()
return self.ActivateContext(c, types.OnFocusOpts{})
}
func (self *ContextMgr) Push(c types.Context, opts ...types.OnFocusOpts) error {
if len(opts) > 1 {
return errors.New("cannot pass multiple opts to Push")
}
singleOpts := types.OnFocusOpts{}
if len(opts) > 0 {
// using triple dot but you should only ever pass one of these opt structs
singleOpts = opts[0]
}
if !c.IsFocusable() {
return nil
}
contextsToDeactivate, contextToActivate := self.pushToContextStack(c)
for _, contextToDeactivate := range contextsToDeactivate {
if err := self.deactivateContext(contextToDeactivate, types.OnFocusLostOpts{NewContextKey: c.GetKey()}); err != nil {
return err
}
}
if contextToActivate == nil {
return nil
}
return self.ActivateContext(contextToActivate, singleOpts)
}
// Adjusts the context stack based on the context that's being pushed and
// returns (contexts to deactivate, context to activate)
func (self *ContextMgr) pushToContextStack(c types.Context) ([]types.Context, types.Context) {
contextsToDeactivate := []types.Context{}
self.Lock()
defer self.Unlock()
if len(self.ContextStack) > 0 &&
c.GetKey() == self.ContextStack[len(self.ContextStack)-1].GetKey() {
// Context being pushed is already on top of the stack: nothing to
// deactivate or activate
return contextsToDeactivate, nil
}
if len(self.ContextStack) == 0 {
self.ContextStack = append(self.ContextStack, c)
} else if c.GetKind() == types.SIDE_CONTEXT {
// if we are switching to a side context, remove all other contexts in the stack
contextsToDeactivate = lo.Filter(self.ContextStack, func(context types.Context, _ int) bool {
return context.GetKey() != c.GetKey()
})
self.ContextStack = []types.Context{c}
} else if c.GetKind() == types.MAIN_CONTEXT {
// if we're switching to a main context, remove all other main contexts in the stack
contextsToKeep := []types.Context{}
for _, stackContext := range self.ContextStack {
if stackContext.GetKind() == types.MAIN_CONTEXT {
contextsToDeactivate = append(contextsToDeactivate, stackContext)
} else {
contextsToKeep = append(contextsToKeep, stackContext)
}
}
self.ContextStack = append(contextsToKeep, c)
} else {
topContext := self.currentContextWithoutLock()
// if we're pushing the same context on, we do nothing.
if topContext.GetKey() != c.GetKey() {
// if top one is a temporary popup, we remove it. Ideally you'd be able to
// escape back to previous temporary popups, but because we're currently reusing
// views for this, you might not be able to get back to where you previously were.
// The exception is when going to the search context e.g. for searching a menu.
if (topContext.GetKind() == types.TEMPORARY_POPUP && c.GetKey() != context.SEARCH_CONTEXT_KEY) ||
// we only ever want one main context on the stack at a time.
(topContext.GetKind() == types.MAIN_CONTEXT && c.GetKind() == types.MAIN_CONTEXT) {
contextsToDeactivate = append(contextsToDeactivate, topContext)
_, self.ContextStack = utils.Pop(self.ContextStack)
}
self.ContextStack = append(self.ContextStack, c)
}
}
return contextsToDeactivate, c
}
func (self *ContextMgr) Pop() error {
self.Lock()
if len(self.ContextStack) == 1 {
// cannot escape from bottommost context
self.Unlock()
return nil
}
var currentContext types.Context
currentContext, self.ContextStack = utils.Pop(self.ContextStack)
newContext := self.ContextStack[len(self.ContextStack)-1]
self.Unlock()
if err := self.deactivateContext(currentContext, types.OnFocusLostOpts{NewContextKey: newContext.GetKey()}); err != nil {
return err
}
return self.ActivateContext(newContext, types.OnFocusOpts{})
}
func (self *ContextMgr) RemoveContexts(contextsToRemove []types.Context) error {
self.Lock()
if len(self.ContextStack) == 1 {
self.Unlock()
return nil
}
rest := lo.Filter(self.ContextStack, func(context types.Context, _ int) bool {
for _, contextToRemove := range contextsToRemove {
if context.GetKey() == contextToRemove.GetKey() {
return false
}
}
return true
})
self.ContextStack = rest
contextToActivate := rest[len(rest)-1]
self.Unlock()
for _, context := range contextsToRemove {
if err := self.deactivateContext(context, types.OnFocusLostOpts{NewContextKey: contextToActivate.GetKey()}); err != nil {
return err
}
}
// activate the item at the top of the stack
return self.ActivateContext(contextToActivate, types.OnFocusOpts{})
}
func (self *ContextMgr) deactivateContext(c types.Context, opts types.OnFocusLostOpts) error {
view, _ := self.gui.c
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