[jamming] The right way to do

[Mildred]

Hi,

I'm writing Jam rules and I'm wondering if I do it right, because it
seems there is a heavy skeleton I have to follow.

For example, if someone asks me to write a rule for some program that
converts jpeg files to png, I would write in my Jamrules:

rule JpegToPng {
    local png  = [ FGristFiles $(1) ] ;
    local jpeg = [ FGristFiles $(2) ] ;
    SEARCH on $(jpeg) = $(SEARCH_SOURCE) ;
    MakeLocate $(png) : $(LOCATE_TARGET) ;
    JpegToPng1 $(png) : $(jpeg) ;
}
rule JpegToPng1 png : jpeg {
    Depends $(png) : $(jpeg) ;
    Clear clear : $(png) ;
}
actions JpegToPng1 {
    jpeg2png '$(>)' '$(<)'
}

Isn't there a more effecient way to do that ? A way to avoid always
writing the same thing at the beginning of my rules (that is the
grist, the SEARCH and LOCATE variables that are always the same).

How do you do ?

Thanks.

Mildred


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Mildred Ki'lya
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