On 3/26/09, Erik <esi...@gmail.com> wrote:
> I need to generate a PDF-file from subdocuments. I have this Makefile:
> whole.pdf: 1.pdf 2.pdf 3.pdf 4.pdf 5.pdf 6.pdf 7.pdf 8.pdf 9.pdf
> gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=$@ -dBATCH $^
>
> The problem is that a subdocument may begin on the backside of the last
> page of the previous subdocument. This is bad if the printed document
> should be divided into subdocuments. Therefore I need to make sure that
> every subdocument begins on a new paper. A way to do this would be to
> insert an empty 1-page document (empty.pdf) after each document that has
> an odd number of pages:
> whole.pdf: 1.pdf 2.pdf 3.pdf empty.pdf 4.pdf 5.pdf 6.pdf 7.pdf empty.pdf
> 8.pdf empty.pdf 9.pdf
> gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=$@ -dBATCH $^
>
> That is certainly not the right way to do it. It will fail if I change
> any subdocument so that its page count modulo 2 is changed.
>
> By using pdfinfo (in the poppler package) I can find out whether a
> particular PDF-file has an odd number of pages:
> echo $(pdfinfo file.pdf|egrep "^Pages: *[[:digit:]]+$"|sed "s...@^pages:
> *\([[:digit:]]\+\)\...@\1@")%2|bc
>
> But which is the right way to build that into the Makefile?
Maybe you would be better off doing this in the shell rather than in
make? Something like:
whole.pdf: 1.pdf 2.pdf 3.pdf ...
files=`for i in $^; do echo $$i; if echo $$(pdfinfo ...); then echo
empty.pdf; fi; done`; \
gs -dNOPAUSE ... $$files
Here is a working example with some phony targets to give you a better
idea of what I mean. Basically I just test if the file is "4", and if
so then add in an extra file.
$ cat Makefile
.PHONY: 1 2 3 4 5 whole
whole: 1 2 3 4 5
@files=`for i in $^; do echo $$i; if [ "$$i" == "4" ]; then
echo extra; fi; done`; \
echo "Run command on $$files"
$ make
Run command on 1
2
3
4
extra
5
May require some additional tweaking to get what you want - hope it helps!
-Mike
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