Add tab completion to textinputs

This adds tab completion to textinput components. They can be configured
with a completion function. This function is called when the user
presses <tab>. The first completion is initially shown to the user
inserted into the text. Repeated presses of <tab> or <backtab> cycle
through the completions list. The completions list is invalidated when
any other non-tab-like key is pressed.

Also changed is some logic for current completion generation so that
all available commands are returned when <tab> is pressed with no
current text and similarly for arguments of commands.

1 files changed, 1 insertions, 7 deletions

diff --git a/widgets/exline.go b/widgets/exline.go
index b7b4e3d..4791ae9 100644
--- a/widgets/exline.go
+++ b/widgets/exline.go
@@ -20,7 +20,7 @@ func NewExLine(commit func(cmd string), cancel func(),
 	tabcomplete func(cmd string) []string,
 	cmdHistory lib.History) *ExLine {
 
-	input := ui.NewTextInput("").Prompt(":")
+	input := ui.NewTextInput("").Prompt(":").TabComplete(tabcomplete)
 	exline := &ExLine{
 		cancel:      cancel,
 		commit:      commit,
@@ -64,12 +64,6 @@ func (ex *ExLine) Event(event tcell.Event) bool {
 			ex.input.Focus(false)
 			ex.cmdHistory.Reset()
 			ex.cancel()
-		case tcell.KeyTab:
-			complete := ex.tabcomplete(ex.input.StringLeft())
-			if len(complete) == 1 {
-				ex.input.Set(complete[0] + " " + ex.input.StringRight())
-			}
-			ex.Invalidate()
 		default:
 			return ex.input.Event(event)
 		}