#!/bin/bash
#
#	Ross J. Michaels (1995)
#	rjm2@lehigh.edu
#
#	and
#
#	Judith Elaine
#	blondie@cybertia.org.tenn.com
#
#	(Only the major functional lines were entered by Bill 
#	Stearns (wstearns@pobox.com).  The full text can be found
#	in the November 1995 Linux Gazette at:
#	http://www.ssc.com/lg/linux/gazette.nov.html
#
# Since this was typed in, improvements have been made by Bill
# Stearns.

#Version 0.4

CONFIG_DIR="${HOME}/config"
DIR_DIST="${HOME}/config/dist"
DIR_LINKS="${HOME}/config/links"
DIR_BACKUPS="${HOME}/config/backup"
EDITED_FILES="${HOME}/config/edited_files"
#EDITOR='pico -w'
#EDITOR='mcedit'
EDITOR='mcedit -c'
CURR_DIR=`pwd`

#if [ "$LOGNAME" != "root" ]
#then
#	echo "hack: user not logged in as root" ; exit 1
#fi

if [ "$1" = "" ]; then echo "hack: filename is missing" ;			exit 2	; fi
if [ -d "$1" ]; then echo "hack: filename is a directory" ;			exit 3	; fi
if [ ! -f "$1" ]; then echo "hack: filename is bad" ;				exit 3	; fi

BASENAME="`basename $1`"

if [ ! -d $CONFIG_DIR ]; then mkdir $CONFIG_DIR ; chmod 711 $CONFIG_DIR 		; fi
if [ ! -d $DIR_DIST ]; then mkdir $DIR_DIST ; chmod 711 $DIR_DIST			; fi
if [ ! -d $DIR_BACKUPS ]; then mkdir $DIR_BACKUPS ; chmod 711 $DIR_BACKUPS		; fi
if [ ! -d $DIR_LINKS ]; then mkdir $DIR_LINKS ; chmod 711 $DIR_LINKS			; fi
if [ ! -f $EDITED_FILES ]; then touch $EDITED_FILES ; chmod 600 $EDITED_FILES		; fi
if [ ! -f "$DIR_DIST/$BASENAME.dist" ]; then
	cp "$1" "$DIR_DIST/$BASENAME.dist"
	echo "hack: creating file $DIR_DIST/$BASENAME.dist"
elif [ -f "$DIR_DIST/$BASENAME.dist" ]; then
	echo "hack: $DIR_DIST/$BASENAME.dist already exists"
else
	echo "hack: fatal error in destination file"
	exit 4
fi

if [ -f "$CURR_DIR/$1" ]; then
	if [ $CURR_DIR = "/" ]; then
		ln -s "$1" "$DIR_LINKS/$BASENAME"
		echo "hack: linking $1"
		echo "/$1" >> $EDITED_FILES
	elif [ ! -L "$DIR_LINKS/$1" ]; then
		ln -s "$CURR_DIR/$1" "$DIR_LINKS/$1"
		echo "hack: (c) linking $CURR_DIR/$1"
		echo "$CURR_DIR/$1" >> $EDITED_FILES
	else
		echo "$CURR_DIR/$1" >> $EDITED_FILES
	fi
elif [ -f "$1" ]; then
	if [ ! -L "$DIR_LINKS/$BASENAME" ]; then
		ln -s "$1" "$DIR_LINKS/$BASENAME"
		echo "hack: linking $1"
	fi
	echo "$1" >> $EDITED_FILES
else
	echo "hack: something is fundamentally wrong here"
fi

if [ `ls -al "$1" | awk '{print $2}'` -gt 1 ]; then
	echo "$1" is hardlinked, copying to break link.
	if type -path mktemp >/dev/null 2>/dev/null ; then
		notempfile () {
		#Handle the case where the temp file can't be created for some reason.
			echo Couldn\'t create $1 temp file, exiting.
			exit 1
		}
		TEMPFILE=`mktemp -q /tmp/hack.XXXXXX` || notempfile hack
	else
		echo No mktemp on this system, using insecure method for temp file.
		TEMPFILE=/tmp/hack.$$
		rm -f $TEMPFILE
	fi
	cp -p "$1" $TEMPFILE
	rm -f "$1"
	mv $TEMPFILE "$1"
else
	echo "$1" has only a single link, good.
fi

cp -b "$1" "$DIR_BACKUPS/$BASENAME.`date +%y%m%d`"
echo "hack: creating dated backup $BASENAME.`date +%y%m%d`"

rm -f $EDITED_FILES.tmp
cp $EDITED_FILES $EDITED_FILES.tmp
cat $EDITED_FILES.tmp | sort | uniq > $EDITED_FILES
rm -f $EDITED_FILES.tmp

if [ "${TERM}" = "xterm" -o "${TERM}" = "xterm-color" ]; then 
	echo -ne "\033]0;hack ${1}\007"
fi

#Many thanks to Johannes Ullrich for the rcs tutorial.
if [ -f "$1,v" ] || [ -f "RCS/$1,v" ]; then
	echo Checking out and locking "$1" file in rcs.
	co -l "$1"
fi

$EDITOR "$1"

if [ -f "$1,v" ] || [ -f "RCS/$1,v" ]; then
	echo Checking in and unlocking "$1" file in rcs.
	ci -u "$1"
fi

if [ "${TERM}" = "xterm" -o "${TERM}" = "xterm-color" ]; then 
	if [ -n "${XTITLE}" ]; then 
		echo -ne "\033]0;${XTITLE}\007" ; 
	else
		echo -ne "\033]0;${USER}@${SHOSTNAME} ${PWD}\007" | sed -e "s@${HOME}@\~@"
	fi
fi

exit