#!/bin/ksh
#Copy files to the ~/public_html directory so they can be seen on the web.
#Sample use: post filename1 filename2 filename3
#If no arguments, store the standard input into a file named
#~/public_html/junk, overwriting it if it already exists.

chmod a+rx ~ #Turn on all of the home directory's r and x bits; Handout 3 p. 16

if [[ ! -d ~/public_html ]]   #If there is no directory named ~/public_html,
then
	if [[ -e ~/public_html ]]
	then
		echo $0: will not create the ~/public_html directory, 1>&2
		echo because something with that name already exists 1>&2
		exit 1
	fi

	chmod u+w ~ #Turn on the home directory's leftmost w bit for the mkdir.
	mkdir ~/public_html
fi

#Now that we know that the ~/public_html directory exists,
#make sure that it's chmod'd correctly.
chmod a+rx ~/public_html   #Turn on "all" three r's and x's.
chmod u+w ~/public_html    #Turn on the public_html directory's leftmost w bit.

if [[ $# -eq 0 ]]
then
	cd ~/public_html
	rm -f junk       #-f for "force": remove it even if it's write protected
	cat > junk       #Cat the shellscript's standard input into a file.
	chmod 444 junk   #r--r--r--
else
	for filename in $*   #The "in $*" is optional: pp. 144-145.
	do
		if [[ ! -f $filename ]]
		then
			echo $0: there is no file named $filename 1>&2
			exit 2
		fi

		if [[ ! -r $filename ]]
		then
			echo $0: have no permission to copy $filename 1>&2
			exit 3
		fi

		basename=${filename##*/}   #Handout 4, p. 3.

		if [[ -e ~/public_html/$basename ]]
		then
			echo $0: ~/public_html/$basename already exists 1>&2
			exit 4
		fi

		cp $filename ~/public_html
		chmod 444 ~/public_html/$basename
	done
fi

exit 0