add basic support for repl interaction in x11

Define x11-repl command that optionally takes the name of an interpreter
to start it on a new window. Users then can select some text in the
editor and use [x11-]send-text command to send it to the interpreter.
Ideally the latter command should be bound to a key for easier
interaction. Requires xsel and xdotool to work.

rc/x11.kak

@@ -30,6 +30,28 @@ def -docstring 'create a new kak client for current session' \
         setsid ${kak_opt_termcmd} "kak -c ${kak_session} ${kakoune_params}" < /dev/null > /dev/null 2>&1 &
 }}
 
+def -docstring 'create a new window for repl interaction' \
+    -params 0..1 \
+    -command-completion \
+    x11-repl %{ %sh{
+        if [ -z "${kak_opt_termcmd}" ]; then
+           echo "echo -color Error 'termcmd option is not set'"
+           exit
+        fi
+        if [ $# -eq 0 ]; then cmd="bash"; else cmd="$1"; fi
+        setsid ${kak_opt_termcmd} ${cmd} -t kak_repl_window < /dev/null > /dev/null 2>&1 &
+}}
+
+def x11-send-text -docstring "send selected text to the repl window" %{
+    %sh{
+        echo "${kak_selection}" | xsel -i
+        wid=$(xdotool getactivewindow)
+        xdotool search --name kak_repl_window windowactivate
+        xdotool key --clearmodifiers "Shift+Insert"
+        xdotool windowactivate $wid
+    }
+}
+
 def -docstring 'focus given client\'s window' \
     -params 0..1 -client-completion \
     x11-focus %{ %sh{
@@ -44,3 +66,5 @@ def -docstring 'focus given client\'s window' \
 
 alias global focus x11-focus
 alias global new x11-new
+alias global repl x11-repl
+alias global send-text x11-send-text