readline: Automatically do word completion based on history

tools/tui/readline/completion.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"kitty/tools/cli"
+	"kitty/tools/tty"
 	"kitty/tools/utils"
 	"kitty/tools/wcswidth"
 )
@@ -63,6 +64,8 @@ type completions struct {
 	current   completion
 }
 
+var _ = tty.DebugPrintln
+
 func (self *Readline) complete(forwards bool, repeat_count uint) bool {
 	c := &self.completions
 	if c.completer == nil {