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July 29, 2018 std.getopt: Unexpected behavior when using incremental options | ||||
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Hi, I am using std.getopt and expect to parse an incremental option with different names: --long, --longer, -l. The sample code is here https://gist.github.com/icy/b8ed758b48134b369e854205aeb8f308 excerpt: [code] auto results = getopt(args, std.getopt.config.noBundling, std.getopt.config.passThrough, "longer|long|l+", &s_long ); [/code] I don't expect the program also accepts `-long` , unfortunately it does. The default help message also prints incorrect information: [code] $ rdmd tests.d -l -long --long --longer -h Basic usage: -long --longer -h --help This help information. How long it is: 4 Remained: "/tmp/.rdmd-314/rdmd-tests.d-0C7A52ECD8084516F3064EED864D6E86/tests" [/code] Did I have something wrong with my code? Thanks for your reading and support. |
July 29, 2018 Re: std.getopt: Unexpected behavior when using incremental options | ||||
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Posted in reply to Ky-Anh Huynh | On Sunday, 29 July 2018 at 09:28:41 UTC, Ky-Anh Huynh wrote:
> Hi,
>
> I am using std.getopt and expect to parse an incremental option with different names: --long, --longer, -l. The sample code is here
>
> [...]
I think -long is actually taken as -l -o -n -g here. Since you didn't define -o, -n and -g it prints a usage error.
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July 29, 2018 Re: std.getopt: Unexpected behavior when using incremental options | ||||
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Posted in reply to Cym13 | On Sunday, 29 July 2018 at 10:57:06 UTC, Cym13 wrote: > On Sunday, 29 July 2018 at 09:28:41 UTC, Ky-Anh Huynh wrote: >> Hi, >> >> I am using std.getopt and expect to parse an incremental option with different names: --long, --longer, -l. The sample code is here >> >> [...] > > I think -long is actually taken as -l -o -n -g here. Since you didn't define -o, -n and -g it prints a usage error. I think that I've got that. There isn't any actual definition of short/long option names. That means if I provide [code] "l|long|longer+", &s_long [/code] getopt will define 6 variants: -l, --l, -long, --long, -longer, --longer, and here `-long`, `-l` and `-longer` are both short:) `Short` isn't related to the length of the option name. It's short because there is only one dash (-). This way using "short" is quite confusing. Regarding the output of the default help message, I should put `l` at the first position, as in `l|long|longer`. This is slightly different from examples in the official documentation (https://dlang.org/phobos/std_getopt.html) where you are expected to see `long|longer|l+` instead. |
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