jc swallows exit codes

When running jc some_program, even if some_program exits with non-zero exit code, jc exits with zero:

$ jc ifconfig eth0
eth0: error fetching interface information: Device not found
[]
$ echo $?
0

Otherwise clean and straightforward integration with Next Generation Shell behaves incorrectly (with regard to errors) due to this issue.

``jc ...`` # should throw an exception but can't because exit code is  0

[kellyjonbrazil]

This is now working on the dev branch. I added the following section to the Readme and man page:

Exit Codes

Any fatal errors within jc will generate an exit code of 100, otherwise the exit code will be 0. When using the “magic” syntax (e.g. jc ifconfig eth0), jc will store the exit code of the program being parsed and add it to the jc exit code. This way it is easier to determine if an error was from the parsed program or jc.

Consider the following examples using ifconfig:

ifconfig exit code	jc exit code	Combined exit code	Interpretation
0	0	0	No errors
1	0	1	Error in ifconfig
0	100	100	Error in jc
1	100	101	Error in both ifconfig and jc

[kellyjonbrazil]

v1.15.4 is now available via pip and includes this functionality.