libvips/tools/vips-8.0

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2015-02-11 18:01:02 +01:00
#!/bin/bash
#
# Start script for VIPS
# need extended regexps, hence we insist on bash above
shopt -s extglob
# set -x
# name we were invoked as
bname=`basename $0`
# check args
if [[ $# < 1 ]]; then
echo "usage: $bname [command ...]"
echo "examples:"
echo " $bname man im_invert"
echo " $bname vips im_invert /pics/tmp/fred.jpg /pics/tmp/fred2.tif"
exit 1
fi
# prepend a path component to an environment variable
# be careful to avoid trailing : characters if the var is not defined, they
# can cause security problems
function prepend_var () {
# we have to use eval to do double indirection, I think
eval value="\$$1"
if [ "x$value" = x ]; then
export $1=$2
else
export $1=$2:$value
fi
}
# try to extract the prefix from a path to an executable
# eg. "/home/john/vips/bin/fred" -> "/home/john/vips"
function find_prefix () {
# try to canonicalise the path
ep_canon=$1
# relative path? prefix with pwd
if [ ${ep_canon:0:1} != "/" ]; then
ep_canon=`pwd`/$ep_canon
fi
# replace any "/./" with "/"
ep_canon=${ep_canon//\/.\//\/}
# any "xxx/../" can go
ep_canon=${ep_canon//+([^\/])\/..\//}
# trailing "xxx/.." can go
ep_canon=${ep_canon/%+([^\/])\/../}
# remove trailing "/bin/xxx" to get the prefix
ep_prefix=${ep_canon/%\/bin\/+([^\/])/}
# was there anything to remove in that final step? if not, the path
# must be wrong
if [ x$ep_prefix == x$ep_canon ]; then
return 1
fi
echo $ep_prefix;
return 0
}
# try to guess the install prefix from $0
function guess_prefix () {
# $0 is a file? must be us
if [ -f $0 ]; then
find_prefix $0
return
fi
# nope, extract program name from $0 and try looking along the
# searchpath for it
name=`basename $0`
fred=$PATH
while [ x$fred != x"" ]; do
path=${fred/:*/}/$name
fred=${fred/*([^:])?(:)/}
if [ -f $path ]; then
find_prefix $path
return
fi
done
# not found on path either ... give up!
return 1
}
prefix=`guess_prefix`;
if [ $? != 0 ]; then
echo "unable to find $0 from the file name, or from your PATH"
echo "either run directly, or add the install bin area to "
echo "your PATH"
exit 1
fi
export VIPSHOME=$prefix
# add VIPSHOME to man pages
prepend_var MANPATH $VIPSHOME/man
# add the VIPS lib area to the library path
case `uname` in
HPUX)
libvar=SHLIB_PATH
;;
Darwin)
libvar=DYLD_LIBRARY_PATH
;;
*)
libvar=LD_LIBRARY_PATH
;;
esac
prepend_var $libvar $VIPSHOME/lib
# add VIPS bin area to path
prepend_var PATH $VIPSHOME/bin
# run, passing in args we were passed
exec $*