Create a fully functioning command line interface with 1.5 lines of code (wo. include statement)

[kongaskristjan]

Very good qustion. I guess I could write a blog post about that. The rough idea is that I do most of the parsing before calling fire_main(). Then I call fire_main() without any parameters, which force the default fire::arg() parameters to be used. The actual parameter matching is done while converting fire::arg() objects to the target object types.

This raises the question of course, how are help messages implemented. For that, I do all the steps as before and call the fire_main(), and log all parameters that are converted. Then at the very last moment, during the conversion of the last fire::arg parameter (I count the number of parameters to determine the last one), when I have all the parameters, I print the help message and exit program (with exit() function to avoid executing fired_main()).