fish: functions/gdbt: Spawning GDB with tmux panes

Adapted from https://github.com/cyrus-and/gdb-dashboard/issues/63.

fish/.config/fish/functions/gdbt.fish

@@ -0,0 +1,24 @@
+function gdbt -d "GDB with tmux panes"
+  if set -q TMUX
+    set proc (ps -ef | fzf | awk '{print $2}')
+
+    if test -n "$proc"
+      set -l tty1_id (tmux split-pane -hPF "#D" "tail -f /dev/null")
+      tmux last-pane
+      set -l tty1 (tmux display-message -p -t "$tty1_id" '#{pane_tty}')
+
+      set -l tty2_id (tmux split-pane -hPF "#D" "tail -f /dev/null")
+      tmux last-pane
+      set -l tty2 (tmux display-message -p -t "$tty2_id" '#{pane_tty}')
+
+      tmux select-layout even-horizontal
+
+      gdb -q -ex "dashboard breakpoints -output $tty1" -ex "dashboard variables -output $tty1" -ex "dashboard threads -output $tty2" -ex "attach $proc"
+
+      tmux kill-pane -t $tty1_id
+      tmux kill-pane -t $tty2_id
+    end
+  else
+    echo "Not inside TMUX"
+  end
+end