Keith Marshall <[email protected]> wrote:
|On 17/09/14 22:22, Peter Schaffter wrote:
|> On Wed, Sep 17, 2014, Steffen Nurpmeso wrote:
|>> I'm not in the position to say something to PDFPIC today (direct
|>> support would be pretty cool!), but there should be general tools
|>> for sh(1) (perl(1)...) that can be included in a defined way and
|>> used. I.e., roff "libraries".
|>>
|>> And the very same is true for generic use of external commands, as
|>> is used by you, and what came to my mind immediately when reading:
|>>
|>> . sy pdfinfo @$1 | \
|>> grep "Page *size" | \
|>> sed -e 's/Page *size: *\\([[:digit:].]*\\) *x *\\([[:digit:].]*\\).*$/\
|>> .nr pdf-wid (p;\\1)\\n\
|>> .nr pdf-ht (p;\\2)/' \
|>>> /tmp/pdfpic\n[$$]
|>>
|>> For example here. There should be a way to safely generate
|>> temporary file names in the temporary directory that is currently
|>> used, whatever this is (most likely $TMPDIR).
|>
|> Yes. The way groff stands now, I'm uneasy relying on external tools
|> and .sy for anything but local, user-written macros. There's precedent,
|> though, in www.tmac (PIMG), and this seems to be the best solution
|> for PDF images.
|
|Do note, however, that this will compromise portability; e.g. pdfinfo is
|unlikely to be supported on MS-Windows hosts. Also, since .sy is an
|intrinsically unsafe request, any macro which relies on it *must* be
|invoked in unsafe mode, and users should rightly be wary of enabling
|that, for untrusted sources.
I think in the end the best would also be a new command, say,
`.imgconvert {TARGETFORMAT->EPS} SOURCEFILE [WIDTH [HEIGHT]]', or
`.img2eps', or similar, that works in the C++ machinery on safely
managed temporary files. And maybe `.imgbb'. But the latter
could be more or less useless if the converted image file is
accessible via some string.
--steffen
