printing bash prompt and command into the output in addition to command, and its output

Question

I am looking for a way to print the bash prompt, command and its output as shown below into an image for documentation purposes while studying, I wrote a quick command to do that, but I need the bash prompt to be automatically printed instead of me changing this part of the command [$USER@`hostname` ~]# when the user or path changes, not forgetting the tilde for home directory and #/$ depending on whether the user is root or not so that all I need to change is cmd="ls -l";, I also don't want to use $PWD because I get the complete path, rather I need exact bash prompt:

cmd="ls -l"; convert -font DejaVu-Sans-Mono-Book -pointsize 16 label:"$(echo "[$USER@`hostname` ~]# $cmd\n";$cmd)" /home/myuser/Desktop/result.png

The above results in this image, note that [root@centos7 ~] is also included in the image:

I tried the variable $PS1 from this answer and this answer, but I get:

[\u@\h \W]\$

Thank you

Answer 1

I ended up writing a script because it seems there is no solution on the net:

#!/bin/bash

CMD=$1
#DIR=$(readlink -ve "/proc/$PPID/cwd")
DIR=`pwd`
PRIVILEGE='$'

#echo $DIR
[ $# -eq 0 -o $# -gt 1 ] && { echo -e "Usage:\n\t $0 command\n\t Command should be enclosed in quotations"; exit 1; }
if [ $UID -ne 0 ]; then echo "Please run this script with sudo:"; echo "sudo $0 $*"; exit 1; fi

mkdir -p /result

#echo $DIR
PATTERN="^\/home\/\w+$"
if [[ $DIR =~ $PATTERN || $DIR == '/root' ]]; then DIR='~'; else DIR=`basename $PWD`; fi
echo $DIR

if [ $UID -eq 0 ]; then PRIVILEGE='#'; fi
#echo $PRIVILEGE

NUM=`ls -vr /result/ | head -1 | sed -e 's/\..*$//'`
if [ ! -n "$NUM" ]; then NUM=1; else ((NUM++)); fi

convert -font DejaVu-Sans-Mono-Book -pointsize 16 label:"$(echo "[`id -u -n`@`hostname` $DIR]$PRIVILEGE $CMD";$CMD)" /result/$NUM.png
echo $NUM.png