#/bin/sh
# @(#) viall  Edit all files into one large file
#
# Define a temporary file :
t=/tmp/`basename $0`.$$
#
# Erase the temporary file when script is interrupted :
trap 'rm -f $t ; exit 0' 1 2 15
#
# Process command line arguments :
if [ $# -ne 0 ] ; then			# user specified arguments
	echo $* | tr ' ' '\012'		# separate them by newlines
else					# no command-line file arguments
	cat				# gather names from stdin
fi | {
	#
	# Write header at beginning of combined file :
	echo 't=/tmp/$$ ; e=0'		# define temp. file, exit status
	#
	# Define function to unpack shell archive :
	echo 'la_fonc() { cat >$t && { cmp -s $t $f ||
		{ echo $f ; cp $t $f ; } ; } || e=1 ; }'
	#	
	# Process the file names :
	while read f ; do
		[ ! -f $f ] && continue		# fetch next name if file doesn't exist
		echo ":"
		[ ! -w $f ] && (echo ': %%%%%%%%%%%%%%%'; echo ': %  READ-ONLY  %')	#if not writable
		echo ": %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"
		echo "  f=$f"
		echo ": %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"
		echo ":"
		#
		# Create shell archive containing file contents :
		echo "la_fonc <<'END_OF_FILE '$f"	# construct "here" document
		cat $f					# include file contents
		echo END_OF_FILE $f			# end of "here" document
	done
	#
	# Write commands to end clean up and exit :
	echo 'rm -f $t'		# rmove the temporary file
	echo 'exit $e'		# exit status with $e
} > $t				# everything combined in temp. file
trap 1 2 15		# reset default signal handling
trap '' 2 3		# ignore intr, quit signals while editing
#
# Invoke the editor specified as VISUAL, EDITOR or vi by default
${VISUAL-${EDITOR-vi}} $t </dev/tty	# input from controlling terminal
trap 2 3				# restore default signal handling
/bin/sh $t && rm -f $t			# unpack the shell archive and erase it