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package modes
import (
"errors"
"src.elv.sh/pkg/cli"
"src.elv.sh/pkg/cli/tk"
"src.elv.sh/pkg/ui"
)
// Listing is a customizable mode for browsing through a list of items. It is
// based on the ComboBox widget.
type Listing interface {
tk.ComboBox
}
// ListingSpec specifies the configuration for the listing mode.
type ListingSpec struct {
// Key bindings.
Bindings tk.Bindings
// Caption of the listing. If empty, defaults to " LISTING ".
Caption string
// A function that takes the query string and returns a list of Item's and
// the index of the Item to select. Required.
GetItems func(query string) (items []ListingItem, selected int)
// A function to call when the user has accepted the selected item. If the
// return value is true, the listing will not be closed after accepting.
// If unspecified, the Accept function default to a function that does
// nothing other than returning false.
Accept func(string)
// Whether to automatically accept when there is only one item.
AutoAccept bool
}
// ListingItem is an item to show in the listing.
type ListingItem struct {
// Passed to the Accept callback in Config.
ToAccept string
// How the item is shown.
ToShow ui.Text
}
var errGetItemsMustBeSpecified = errors.New("GetItems must be specified")
// NewListing creates a new listing mode.
func NewListing(app cli.App, spec ListingSpec) (Listing, error) {
if spec.GetItems == nil {
return nil, errGetItemsMustBeSpecified
}
if spec.Accept == nil {
spec.Accept = func(string) {}
}
if spec.Caption == "" {
spec.Caption = " LISTING "
}
accept := func(s string) {
app.PopAddon()
spec.Accept(s)
}
w := tk.NewComboBox(tk.ComboBoxSpec{
CodeArea: tk.CodeAreaSpec{
Prompt: modePrompt(spec.Caption, true),
},
ListBox: tk.ListBoxSpec{
Bindings: spec.Bindings,
OnAccept: func(it tk.Items, i int) {
accept(it.(listingItems)[i].ToAccept)
},
ExtendStyle: true,
},
OnFilter: func(w tk.ComboBox, q string) {
it, selected := spec.GetItems(q)
w.ListBox().Reset(listingItems(it), selected)
if spec.AutoAccept && len(it) == 1 {
accept(it[0].ToAccept)
}
},
})
return w, nil
}
type listingItems []ListingItem
func (it listingItems) Len() int { return len(it) }
func (it listingItems) Show(i int) ui.Text { return it[i].ToShow }
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