Tags: patch

There are commands that fail without printing any messages, but 
set specific error codes.

This patch extends the default prompt function to show the exit 
code of the previous failed command.

Before:

~ $ false
~ $

After:

~ $ false
~ [1] $

I believe this is a good default, since it is displayed only when 
a error occurs and hopefully makes debugging easier by showing the 
error code without further input.


In GNU Emacs 30.0.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.8) of 2023-08-29 built on T480s
Repository revision: ed77dc17f657d99ccf23778c14f06f7226f478f0
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure -C --prefix /home/davide/.local --with-pgtk
 --with-native-compilation --enable-link-time-optimization
 --enable-locallisppath=/usr/share/emacs/site-lisp/
 'CFLAGS=-march=native -O2''