[squeak-dev] Improving command line argument processing
K K Subbu
kksubbu.ml at gmail.com
Mon Jun 8 19:26:03 UTC 2020
On 08/06/20 4:23 am, David T. Lewis wrote:
> $ squeak squeak.image -- arg1 arg2 arg3 "do not treat arg1 as a script"
This should result in an error. Unix convention is to prefix - or -- to
options and therefore -- is a special marker to terminate option
processing and allow arguments beginning with -. So you can type "grep
-- -v" to search for -v in files. In our case, squeak.image does not
begin with - and so option processing stops automatically. Anything
after the image file becomes the arguments for the image and not the
platform vm. So there is no need to use -- for disambiguation.
> $ squeak script.st arg1 arg2 arg3 ==> error image not found
On Unix, the env variable SQUEAK_IMAGE is checked if the first argument
is not an image file. If the variable is not set, then the image file is
assumed to be "squeak.image". So this will be a valid invocation:
$ squeak ${SQUEAK_IMAGE:-squeak.image} script.st arg1 arg2 arg3
Regards .. Subbu
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