Could you tell what was hard to you?

necessary evil for bash scripts

This file is a plain shell script, not a bash script.

For example, in the first part

case "$0" in
*/*) srcdir=`dirname $0`;;
*) srcdir="";;
esac

$0 --> Name of the script being run. Something I knew, but needed a few seconds to remember
*/* --> Pattern matching looking for slash. Didn't know what that was. Had to google it.

From there I understood here we are checking whether the script was called from a path or not. But it was not obvious.

For example, in the first part

case "$0" in
*/*) srcdir=`dirname $0`;;
*) srcdir="";;
esac

$0 --> Name of the script being run. Something I knew, but needed a few seconds to remember / --> Pattern matching looking for slash. Didn't know what that was. Had to google it.

From there I understood here we are checking whether the script was called from a path or not. But it was not obvious.

I thought it was a very common idiom as sh scripts.
OK, it'd be good to add comments.

@nobu

Some comments already help a lot.
Removed the wrapper functions so the original script is not changed too radically.