Re: GNU make - word position in list

[Colin S. Miller]

Mathieu Zhang wrote:
> Hi all,
>
> I have one source pdf file source.pdf, that I want to use pdftk to
> split into multiple files such that the n-th file on the target list
> is the n-th page from source.pdf
>
> TARGETS = "foo.pdf bar.pdf more_foo.pdf ... "
>
> What I want, is to have a rule like this:
>
> ${TARGETS} : source.pdf
>     pdftk A=$? cat A# output $@
>
> where # is the position of $@ inside the list ${TARGETS}.  I see a lot
> of buildin pattern matching and substitution functions, but I don't
> see anything that help find the matching position.
>
> Any idea?
>
> --MZ

MZ,

Untested massive overkill
     pdftk A=$? cat A$(( echo ${TARGETS} | tr '[[:space:]]' '\n' | grep -vE ^$ 
| grep -ix $@ | cut -d: -f1 ))  output $@

but you might be better writing a helper app to do it for you.

HTH,
Colin S. Miller


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