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package controllers
import "github.com/jesseduffield/lazygit/pkg/gui/types"
// Embed this into your list controller to get some convenience methods for
// ensuring a single item is selected, etc.
type ListControllerTrait[T comparable] struct {
c *ControllerCommon
context types.IListContext
getSelectedItem func() T
getSelectedItems func() ([]T, int, int)
}
func NewListControllerTrait[T comparable](
c *ControllerCommon,
context types.IListContext,
getSelected func() T,
getSelectedItems func() ([]T, int, int),
) *ListControllerTrait[T] {
return &ListControllerTrait[T]{
c: c,
context: context,
getSelectedItem: getSelected,
getSelectedItems: getSelectedItems,
}
}
// Convenience function for combining multiple disabledReason callbacks.
// The first callback to return a disabled reason will be the one returned.
func (self *ListControllerTrait[T]) require(callbacks ...func() *types.DisabledReason) func() *types.DisabledReason {
return func() *types.DisabledReason {
for _, callback := range callbacks {
if disabledReason := callback(); disabledReason != nil {
return disabledReason
}
}
return nil
}
}
// Convenience function for enforcing that a single item is selected.
// Also takes callbacks for additional disabled reasons, and passes the selected
// item into each one.
func (self *ListControllerTrait[T]) singleItemSelected(callbacks ...func(T) *types.DisabledReason) func() *types.DisabledReason {
return func() *types.DisabledReason {
if self.context.GetList().AreMultipleItemsSelected() {
return &types.DisabledReason{Text: self.c.Tr.RangeSelectNotSupported}
}
var zeroValue T
item := self.getSelectedItem()
if item == zeroValue {
return &types.DisabledReason{Text: self.c.Tr.NoItemSelected}
}
for _, callback := range callbacks {
if reason := callback(item); reason != nil {
return reason
}
}
return nil
}
}
// Ensures that at least one item is selected.
func (self *ListControllerTrait[T]) itemRangeSelected(callbacks ...func([]T, int, int) *types.DisabledReason) func() *types.DisabledReason {
return func() *types.DisabledReason {
items, startIdx, endIdx := self.getSelectedItems()
if len(items) == 0 {
return &types.DisabledReason{Text: self.c.Tr.NoItemSelected}
}
for _, callback := range callbacks {
if reason := callback(items, startIdx, endIdx); reason != nil {
return reason
}
}
return nil
}
}
func (self *ListControllerTrait[T]) itemsSelected(callbacks ...func([]T) *types.DisabledReason) func() *types.DisabledReason { //nolint:unused
return func() *types.DisabledReason {
items, _, _ := self.getSelectedItems()
if len(items) == 0 {
return &types.DisabledReason{Text: self.c.Tr.NoItemSelected}
}
for _, callback := range callbacks {
if reason := callback(items); reason != nil {
return reason
}
}
return nil
}
}
// Passes the selected item to the callback. Used for handler functions.
func (self *ListControllerTrait[T]) withItem(callback func(T) error) func() error {
return func() error {
var zeroValue T
commit := self.getSelectedItem()
if commit == zeroValue {
return self.c.ErrorMsg(self.c.Tr.NoItemSelected)
}
return callback(commit)
}
}
func (self *ListControllerTrait[T]) withItems(callback func([]T) error) func() error {
return func() error {
items, _, _ := self.getSelectedItems()
if len(items) == 0 {
return self.c.ErrorMsg(self.c.Tr.NoItemSelected)
}
return callback(items)
}
}
// like withItems but also passes the start and end index of the selection
func (self *ListControllerTrait[T]) withItemsRange(callback func([]T, int, int) error) func() error {
return func() error {
items, startIdx, endIdx := self.getSelectedItems()
if len(items) == 0 {
return self.c.ErrorMsg(self.c.Tr.NoItemSelected)
}
return callback(items, startIdx, endIdx)
}
}
// Like withItem, but doesn't show an error message if no item is selected.
// Use this for click actions (it's a no-op to click empty space)
func (self *ListControllerTrait[T]) withItemGraceful(callback func(T) error) func() error {
return func() error {
var zeroValue T
commit := self.getSelectedItem()
if commit == zeroValue {
return nil
}
return callback(commit)
}
}
// All controllers must implement this method so we're defining it here for convenience
func (self *ListControllerTrait[T]) Context() types.Context {
return self.context
}
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