terminal: add `:send-keys` command

Add a new command for sending keystrokes to the active terminal, if
there is one visible. Covers split preview, message viewer, composer and
the terminal mode.

This can be used to navigate the embedded applications to scroll or
safely quit them when needed.

Signed-off-by: Vitaly Ovchinnikov <v@postbox.nz>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 51 insertions, 0 deletions

diff --git a/commands/send-keys.go b/commands/send-keys.go
new file mode 100644
index 00000000..f9cae392
--- /dev/null
+++ b/commands/send-keys.go
@@ -0,0 +1,51 @@
+package commands
+
+import (
+	"strings"
+
+	"git.sr.ht/~rjarry/aerc/app"
+	"git.sr.ht/~rjarry/aerc/config"
+	"github.com/gdamore/tcell/v2"
+	"github.com/pkg/errors"
+)
+
+type SendKeys struct{}
+
+func init() {
+	register(SendKeys{})
+}
+
+func (SendKeys) Aliases() []string {
+	return []string{"send-keys"}
+}
+
+func (SendKeys) Complete(args []string) []string {
+	return nil
+}
+
+func (SendKeys) Execute(args []string) error {
+	tab, ok := app.SelectedTabContent().(app.HasTerminal)
+	if !ok {
+		return errors.New("There is no terminal here")
+	}
+
+	term := tab.Terminal()
+	if term == nil {
+		return errors.New("The terminal is not active")
+	}
+
+	text2send := strings.Join(args[1:], "")
+	keys2send, err := config.ParseKeyStrokes(text2send)
+	if err != nil {
+		return errors.Wrapf(err, "Unable to parse keystroke: '%s'", text2send)
+	}
+
+	for _, key := range keys2send {
+		ev := tcell.NewEventKey(key.Key, key.Rune, key.Modifiers)
+		term.Event(ev)
+	}
+
+	term.Invalidate()
+
+	return nil
+}