showimage

linux下的E_MAIL客户端源码

#!/bin/sh
# Copyright (c) 1996 H&L Software, Inc.
# Copyright (c) 1994 HaL Computer Systems, Inc.

# if at least one parameter, see if it is the image type, which has
# the form 'image/<type>'
TYPE='unknown'
if [ $# -ge 1 ]; then
	if [ "`echo $1 | cut -d'/' -f1`" = "image" ]; then
		TYPE=`echo $1 | cut -d'/' -f2`
		shift
	fi
fi

# check for input file name
if [ $# -eq 0 ]; then
	STDIN=1
	FILE="your file"
else
	STDIN=0
	FILE=$1
fi

# make sure /usr/bin/X11 is in the search path
if [ `echo "$PATH" | grep -c "/usr/bin/X11"` -eq 0 ]; then
	PATH=$PATH:/usr/bin/X11
fi

# process according to image type
FILTER=""
case $TYPE in
xwd | x-xwd)
	if [ `type xwud 2>&1 | cut -d' ' -f2` = "not" ]; then
		echo "ERROR: Can't find the 'xwud' program to show $FILE."
		exit 1
	fi
	if [ $STDIN -eq 1 ]; then
		cat - | xwud
	else
		xwud -in $FILE
	fi
	exit $?
	### DONE ###
	;;
xbitmap | x-xbitmap | xbm | x-xbm)
	TYPE=xbm
	;;
pgm | x-pgm)
	if [ `type pgmtopbm 2>&1 | cut -d' ' -f2` = "not" ]; then
		echo "ERROR: Can't find the 'pgmtopbm' program to show $FILE."
		exit 1
	fi
	FILTER="pgmtopbm"
	;;
xpm | x-xpm | x-xpixmap)
	if [ `type xpmtoppm 2>&1 | cut -d' ' -f2` = "not" ]; then
		echo "ERROR: Can't find the 'xpmtoppm' program to show $FILE."
		exit 1
	fi
	FILTER="xpmtoppm"
	;;
*)
	# GIFs, JPEGs, etc.
	;;
esac

# find a viewer program
VIEWER=""
VARGS=""
if [ `type xloadimage 2>&1 | cut -d' ' -f2` = "is" ]; then
	VIEWER=xloadimage
fi
if [ "$TYPE" != "xbm" -a `type xv 2>&1 | cut -d' ' -f2` = "is" ]; then
	VIEWER=xv
	VARGS="-perfect"
fi
if [ `type display 2>&1 | cut -d' ' -f2` = "is" ]; then
	VIEWER=display
	VARGS="-colormap Private"
	if [ "$TYPE" = "xbm" ]; then
		TMP=/tmp/showxbm$$
		echo "#define display seems to need a # on the first line" > $TMP
		if [ $STDIN -eq 1 ]; then
			cat - >> $TMP
			$STDIN = 0
		else
			cat $FILE >> $TMP
			FILE=$TMP
		fi
	fi
fi

if [ "$VIEWER" = "" ]; then
	echo "ERROR: Can't find any viewer program to show $FILE."
	exit 1
fi
if [ $STDIN -eq 1 ]; then
	if [ "$FILTER" = "" ]; then
		$VIEWER -
	else
		cat - | $FILTER | $VIEWER -
	fi
else
	if [ "$FILTER" = "" ]; then
		$VIEWER $FILE
	else
		$FILTER $FILE | $VIEWER -
	fi
fi
RC=$?
if [ "$TMP" != "" ]; then
	rm $TMP
fi
exit $RC