`. bashlog.sh` fails with `/bin/sh` when invoked from cli

[tchinchow]

When invoked from cli on sh bashlog will fail with the following errors:

$ . ./log.sh 
basename: missing operand
Try 'basename --help' for more information.
basename: missing operand
Try 'basename --help' for more information.
basename: missing operand
Try 'basename --help' for more information.

I understand it is bashlog, but so far this has been the only issue I encountered when using it with sh instead of bash.

[tchinchow]

It seems that with sh the $0 is set to "-sh" (note the leading dash).

This confuses basename.