Add code to show command in titlebar

Taken from an [i3 forum answer][1] and edited to remove unnecessary info
(name@hostname and $HOME path)

  [1]: https://faq.i3wm.org/question/2481/how-to-show-cli-application-name-in-window-title/?answer=2482#post-id-2482

dotfiles/bash/post.bashrc

@@ -52,3 +52,31 @@ export PS2=$(make_ps2)
 ### OTHERS ###
 ### '''''' ###
 
+case "$TERM" in
+xterm*|rxvt*|screen*)
+    PROMPT_COMMAND='echo -ne "\033]0;${PWD/$HOME/~}\$\007"'
+
+    # Show the currently running command in the terminal title:
+    # http://www.davidpashley.com/articles/xterm-titles-with-bash.html
+    show_command_in_title_bar()
+    {
+        case "$BASH_COMMAND" in
+            *\033]0*)
+                # The command is trying to set the title bar as well;
+                # this is most likely the execution of $PROMPT_COMMAND.
+                # In any case nested escapes confuse the terminal, so don't
+                # output them.
+                ;;
+            *)
+                if test -n "${BASH_COMMAND}";
+                then
+                    echo -ne "\033]0;${BASH_COMMAND} (${PWD/$HOME/~})\007"
+                else
+                    echo -ne "\033]0;${PWD/$HOME/~}\$\007"
+                fi
+                ;;
+        esac
+    }
+    trap show_command_in_title_bar DEBUG
+    ;;
+esac