Mike Shal skrev:
> On 3/26/09, Erik <[email protected]> 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?
I think make can do it just fine (I do not want to have another script
file in the directory). I RTFM and wrote this, which seems to work:
pagecount = $(shell pdfinfo $(1)|egrep "^Pages: *[[:digit:]]+"|sed
"s...@^pages: *\([[:digit:]]\+\)@\1@")
odd = $(shell echo $(pagecount)%2|bc|grep 1)
filled = $(1) $(if $(call odd,$(1)),emptypage.pdf)
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 $(foreach
x,$^,$(call filled,$x)) || rm -f $@
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