Programming and Scripting :: Dialog helper

I'd say /usr/lib, /usr/local/lib, or somewhere in /opt

I mention /opt because this is DSL, and /opt is the only systemwide directory that is both writable by default and suitable for application files.

Here's an example how I use this dialoghelper in my Gentoo system.
This is a .bashrc file of my root account:

Code Sample

#!/bin/bash

# If user is not in screen session AND file $HOME/.noscreen does not exist...
if [ -z `echo "$TERM" | grep screen` ] && [ ! -f "$HOME/.noscreen" ]
then

# Ask user if he/she wants to start/continue a screen session.
if source /usr/local/lib/dialoghelper && D_BACKTITLE="Starting a root session..." D_TITLE="Question" yesnoDialog "Start/Continue a screen session?"
then

# Retach screen or start new screen session.
# Also run 'clear' after screen exit for security.
# Yes. It's a long line. It could be more neat, but I'm lazy.

screen -dr && clear && exit \
|| ps -U `whoami` -u `whoami` | grep screen > /dev/null \
&& echo -e "\nProblems starting screen. Now running offscreen. :(" \
|| screen && clear && exit \
|| echo -e "\nCould not start screen. Do you have screen installed and is screen in your $PATH?"
fi
# No else here. Do nothing if user chose not to start or continue screen session.

else
# Otherwise tell user that $HOME/.noscreen is present or he/she just opened a new screen window.
# Yes. A long line again.
test -f "$HOME/.noscreen" && test -z `echo "$TERM" | grep screen` \
&& echo -e "File $HOME/.noscreen exist, no screen startup.\n run 'screen' to start new screen session, or 'screen -dr' to continue previous session."
fi

clear

# Show user the $TERM and tell that it's a new window.
# (I myself wanted to see this in every new screen window.)
echo $TERM | grep "screen" > /dev/null \
&& echo -e "New screen window opened.\nTerminal: $TERM" && sleep 1s \
|| echo -e "Root session opened offscreen.\nTerminal: $TERM"
# I added a one sec pause there to show user that the new window
# was _just_ opened. Useless... Maybe.

# Next line is just to load aliases
# I have same aliases for my root account.;)
test -f "/home/zucca/.aliases" && source /home/zucca/.aliases

echo -e "Ready.\n"

# I hope you can read how this script works.;)

Why I made this script is that I sometimes forget to start screen session. If I happen to start a long process in X terminal it will be killed if I close it or exit X (for those who are unfamiliar with screen:all processes started inside screen session will not be terminated even if you close your X terminal). This script really makes me to remember to start screen session. ;)
It's one of the most useful scripts I have made for myself. At least I think it's really neat. ;P

Before there was no choice not to start screen when logged as root now, with help of dialoghelper, there is. Of course you could do that without dialog... ;) But this is just simple example of the use of dialoghelper.
I'll be adding new features to it and compability with DSL's whiptail too.

original here.