19. sdif

NOTE : Korn shell /bin/ksh is got by installing pdksh*.rpm from Linux contrib cdrom

Save this file as text file and chmod a+rx on it.

#!/bin/ksh

# CVS program sdif
# Program to see difference of the working file with CVS copy

# Every filename is composed of 3 parts - Home directory, sub-directory 
# and the filename. The full-path is $HOME/$subdir/$fname
# And in CVS the same directory structure is maintained (by 
# variable $subdir) therefore in cvs we will have $CVSROOT/$subdir/$fname
# In this program these 4 variables $HOME, $CVSROOT, $subdir and $fname
# play a important role. For example, sample values can be like
# HOME=/home/aldev, subdir=myproject/src CVSROOT=/home/cvsroot 
# and fname=foo.cpp

# Caution: Put double-quotes to protect the variables having 
#          spaces, like "$HOME/$subdir" if subdir is 'some foo.cpp'

cmdname=`basename $0`

Usage()
{
        print "\nUsage: $cmdname <filename> "
        print "$cmdname -r<rev1> -r<rev2> <filename> \n"
        exit
}

homedir=` echo $HOME | cut -f1 -d' '  `
if [ "$homedir" = "" ]; then
        print "\nError: \$HOME is not set!!\n"
        exit
fi

FLAG1=""
FLAG2=""
OARG1=""
OARG2=""
# Command getopt will not supported in next major release.
# Use getopts instead.
while getopts r:r: ii
do
        case $ii in
        r)
                if [ "$FLAG1" = "" ]; then
                        FLAG1=$ii;
                        OARG1="$OPTARG"
                else
                        FLAG2=$ii;
                        OARG2="$OPTARG"
                fi
                ;;
        ?) Usage; exit 2;;
        esac
done
shift ` expr $OPTIND - 1 `

if [ "$FLAG2" = "" ]; then
        FLAG2=r
        OARG2=HEAD
fi

cur_dir=`pwd`
#echo $cur_dir

len=${#homedir}
len=$(($len + 2))
#echo $len

subdir=` echo $cur_dir | cut -b $len-2000 `
#echo "subdir is : " $subdir
tmpaa=`dirname $1`
if [ "$tmpaa" = "." ]; then
        fname="$1"
        if [ "$subdir" = "" ]; then
                subdir=$tmpaa
        fi
else
        fname=`basename $1`
        if [ "$subdir" = "" ]; then
                subdir=$tmpaa
        else
                subdir="$subdir/$tmpaa"
        fi
fi
#echo "subdir is : " $subdir
#echo "fname is : " $fname

# CVS directory in your local directory is required for all commands..
if [ ! -d  "$homedir/$subdir/CVS" ]; then
        tmpaa=` (cd "$CVSROOT/$subdir"; find * -prune -type f -print | head -1 ) `
        tmpbb=`basename $tmpaa | cut -d',' -f1 `
        if [ "$tmpaa" = "" -o ! -f "$CVSROOT/$subdir/$tmpbb,v" ]; then
                print "\nThe directory $homedir/$subdir/CVS does not exist"
                print "You must do a sget on `basename $subdir` directory. Give -"
                print "       cd $homedir/`dirname $subdir` "
                print "       sget `basename $subdir` "
                exit
        else
                # Now try to create CVS in local dir by sget
                (
                        cd "$homedir"
                        if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                                cvs -r checkout -A $tmpbb
                        else
                                cvs -r checkout -A "$subdir/$tmpbb"
                        fi
                )
        fi
fi

# Operate inside sub-shell
(
        cd $homedir
        if [ "$FLAG1" = "" ]; then
                cvs diff -r HEAD "$homedir/$subdir/$fname" | less
        else
                cvs diff -$FLAG1 $OARG1 -$FLAG2 $OARG2 "$homedir/$subdir/$fname" | less
        fi
)