[GRASS-dev] Default content for the "answer" to G_OPT_F_INPUT

[Markus Metz]

On Tue, Apr 17, 2018 at 4:21 PM, Nikos Alexandris <nik at nikosalexandris.net>
wrote:
>
> * Moritz Lennert <mlennert at club.worldonline.be> [2018-04-17 15:56:10
+0200]:
>
>> On 17/04/18 15:31, Nikos Alexandris wrote:
>>>
>>> Dear developers,
>>>
>>> is there a way to set a string as the content of a default "answer" for
>>> the G_OPT_F_INPUT option? I am trying to identify potential cases in the
>>> grass-addons repository, but I am not sure I have seen something
related.
>>>
>>> The G_OPT_F_INPUT offers a field to enter a filename. The default
>>> "answer", for the parser, will be the name of the file.
>>>
>>> In addition, a field to "enter values directly" is created. The
>>> description of this field is: "Enter file content directly instead of
>>> specifying a file. Temporary file will be automatically created."
>>>
>>> Can this field be filled with a pre-defined content?
>>> The use case is to expose, to the user, a pre-defined set of
>>> reclassification rules. These will help a beginner to get started,
>>> understand easier and modify rules as he sees fit.
>>
>>
>> Use the 'answer' parameter:
>>
>> #% answer : myfilename
>>
>> Moritz
>
>
> It works: it loads the content of an external file. Are we forced to use
> external files in such a case? Which means an extra file has to be
> shipped with the source code.
> Can we not use an in-script hardcoded string for example?

Be aware that you can't use a hardcoded full path, because depending on the
installation/user/os, that path may or may not exist. If you use a relative
path, that path is relative to the current working directory which is of
course not constant between sessions/installation/user/os. I'm afraid a
default answer to G_OPT_F_INPUT will cause a lot of trouble.

my2c

Markus M
>
> Thank you Moritz, Nikos
>
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