Improve titlebar content

Shows entire previous command, followed by '- Alacritty ($host)'

bash/bashrc

@@ -52,10 +52,18 @@ if ! shopt -oq posix; then
     fi
 fi
 
+if [[ -z $TERM_TITLE ]]; then
+    TERM_TITLE="$TERM";
+fi
+
 # Set window title to last command
-PROMPT_COMMAND='echo -e -n "\033]2;$_\007"'
-# Reconfigure prompt after each return
-PROMPT_COMMAND="$PROMPT_COMMAND; source ${HOME}/.dotfiles/bash/prompt.sh"
+function last_command {
+    local h="$(history 1)";
+    echo "${h##*([[:space:])+([[:digit:]])+([[:space:]])}"
+}
+PS0='\[\e]0;$(last_command) - $TERM_TITLE\a\]'
+# Update prompt
+PROMPT_COMMAND="source ${HOME}/.dotfiles/bash/prompt.sh"
 # Bell when prompt is returned to mark as urgent
 PROMPT_COMMAND="$PROMPT_COMMAND;printf \"\a\"; history -a"