Re: Select a startup class from the command line

[Bruce Steers <bsteers4@xxxxxxxxx>]

On Tue, 22 Apr 2025 at 10:35, Bruce Steers <bsteers4@xxxxxxxxx> wrote:

>
>
> On Tue, 22 Apr 2025 at 06:04, BB <adamnt42@xxxxxxxxx> wrote:
>
>> Is this possible?
>>
>> Some programs run different interfaces depending on the "command"
>> specified on the command line, notably (or perhaps notoriously) "apt". Such
>> as:
>>
>> 	apt get <params>
>> 	apt install <params>
>> 	apt this-that-and-the-other <params>
>>
>> In my case, I'm trying to develop a library to interface to the
>> OpenWeatherMap feed. It will have 3 modes of operation (so far):
>>
>>    - as a library called from a client application, via an exposed
>>    interface class "Weather"
>>    - as a normal executable to allow the user to setup some
>>    configuration data, such as language, API key, etc
>>    - as a normal executable that just shows the weather for a location
>>    through a small UI
>>
>> For the latter two then I want to specify which interface to use is a
>> similar way to the "apt" command:
>>
>>    - weather configure
>>    - weather [show] <location params>
>>    *[show] is optional, if included, the data is just printed on stdout*
>>
>> Note, this is different from the normal usage of the gb.args component
>> where the "options" must come before the "arguments". Here I have a syntax
>> of
>>
>>     weather <command>  <args>  <options>
>>
>> So for example,
>>
>>     weather show -67.42137331544458, 164.77271477068862 -l zu
>>
>> would print the current weather conditions on Sturge Island to stdout in
>> the zulu language (should I ever require it 😕).
>>
>> tia
>>
>> bruce
>>
>
> Not quite sure the exact problem but to answer some questions...
>
> the -s arg sets startup class with gbx3 and gbr3 but you would then need
> to use gbr3 prefix on an executable to give the -s arg and not call the
> executable directly.
>
>
> Args can come after params using Args.class  Args.End()
> -------------
> Dim aRestOfArgs As String[]
> Dim bBoolParam As Boolean
> Args.Begin()
> bBoolParam = Args.Has("b", "bool", "bool param")
>
> aRestOfArgs = Args.End()
> -------------
>
> aRestOfArgs[] is now ALL the other remaining args supplied after the ones
> processed between Begin and End are removed. these can be examined and
> dealt with accordingly.
>
> Does that help?
> Respects
> BruceS
>

Hmm after saying that i realize Args.class will probably fail with an
argument like  -67.42137331544458
"Unknown option -6"

But then there is not much to gb.args when it comes to copying the
Args.module file into your project and modifying it to suit your needs.
Maybe change line 61 from this...
If Len(sArg) > 1 And If Left(sArg) = "-" Then
To this...
If Len(sArg) > 1 And If Left(sArg) = "-" And If IsLetter(sArg[1]) Then

that way only letters not numbers work with - sign

Respects
BruceS