#!/bin/ksh
# @(#) edcron.ksh 2.0 94/04/17
# 93/02/13 John H. DuBois III (john@armory.com)
# 93/04/30 Allow user names on command line.
# 93/07/18 Added options & other functionality.
# 93/07/26 Fixed removal of tmpfile
# 93/10/30 Added -c option
# 94/04/17 Print time of last modification

alias istrue="test 0 -ne"
alias isfalse="test 0 -eq"

# Usage: doed <username>
# The test for whether a file was modified is to save its contents in a
# shell variable & check after editing for whether the contents are the same.
function doed {
    typeset file ans tmp="$TMPDIR/$1.$$" user=$1 tfile

    if crontab -l -u "$user" > $tmp || istrue create; then
	file="$(<$tmp)"
	$VISUAL $tmp
	tfile=/usr/spool/cron/crontabs/$user
	# Print this *after* editing so that it won't be immediately
	# cleared from the screen by the editor startup (unless more than
	# one crontab file is being edited)
	if [ -f $tfile ]; then
	    set -- $(l $tfile)
	    print -u2 "$user's crontab file was last modified $6 $7 $8"
	fi
	if [ "$file" = "$(<$tmp)" ]; then
	    print -u2 "Not modified; skipping $user..."
	else
	    if istrue interactive; then
		echo -n "Submit crontab file for $user? "
		read ans
		if [[ "$ans" != [yY]* ]]; then
		    print "crontab for $user not submitted."
		    rm -f $tmp
		    return 0
		fi
	    fi
	    crontab -u "$user" $tmp &&
	    print "crontab for $user submitted."
	fi
    else
	print -u2 "Skipping $user..."
    fi
    rm -f $tmp
}

DefEd=vi
typeset -i interactive=0 create=0
[ -z "$VISUAL" ] && VISUAL=$EDITOR
[ -z "$VISUAL" ] && VISUAL=$DefEd
[ -z "$TMPDIR" ] && TMPDIR=$TMP
[ -z "$TMPDIR" ] && TMPDIR=/tmp

name=${0##*/}
Usage="Usage: $name [-chi] [user ...]"

while getopts :chi opt; do
    case $opt in
    h)
	echo \
"$name: edit crontab files.
$Usage
Each user's crontab file is presented for editing.
When the editor is exited, the file is submitted to cron and the
next file, if any, is presented.  If the editor is exited without
the file being modified, it is not submitted.  If the environment
variable VISUAL or EDITOR is set, its value is used for the editor.
If not, $DefEd is used.
Options:
-c: Create crontab file if it does not exist.
-h: Print this help info.
-i: Interactive operation.  Ask before submitting new crontab file."
	exit 0
	;;
    c)
	create=1
	;;
    i)
	interactive=1
	;;
    +?)
	print -u2 "$name: options should not be preceded by a '+'."
	exit 1
	;;
    ?) 
	print -u2 "$name: $OPTARG: bad option.  Use -h for help."
	exit 1
	;;
    esac
done
 
# remove args that were options
let OPTIND=OPTIND-1
shift $OPTIND

[ $# -lt 1 ] && set -- $USER

for user; do
    doed "$user"
done