On Saturday, 27 July 2013 at 12:59:06 UTC, monarch_dodra wrote:
On Saturday, 27 July 2013 at 12:19:44 UTC, John Colvin wrote:
On Saturday, 27 July 2013 at 01:09:03 UTC, Jesse Phillips
On Friday, 26 July 2013 at 00:38:46 UTC, John Colvin wrote:
After a few weeks of not getting around to it, here's my
BTW, std.getopt is a good way to parse arguments. Not sure if
it is relevant to what you want to teach, but should
generally be preferred over handwritten.
I'm pretty sure it wouldn't work ideally for echo as the
behaviour depends on the order of the arguments.
getopt knows how to handle ordering, it's really just a matter
of echo's argument parsing rules being different from classic
For example, echo does not handle "--" argument (end of options
mark), which means it is literally impossible for echo's first
"string argument" to be "-n".
So for example, while "echo -- -n" would print "-- -n", a
getopt echo would print "-n".
Arguably, this is better behavior, but if the goal is exact
replication, then it's wrong :/
Also, this wouldn't work
$ echo -E fdsa -n
as getopt would parse the -n as an option.
Exact replication is the name of the game here, as often in the
real world one has to write to a spec that is subtly different to
what library writers had in mind.