#!/usr/bin/bash
#
# This is a simple bash script to convert
# the list provided by bd-sync into instructions
# for copying and deleting.
#
# NB: Scripts are generated in two stages -
#     The copying script itself generates
#     the deletion script. This is for two
#     reasons:
#       1. Allows a review of what is about
#          to be deleted, which is generally
#          irreversible so needs confirmation.
#       2. The flow of copying and deleting
#          is in opposite directions:
#          Copying: FIRST create main directories
#                   THEN create sub-dirs and files
#          Delete : FIRST delete sub-dirs and files
#                   THEN delete main directories
#                   Which is why we have 'the
#                   reversing step' below.
#
# Author: http://the-brown-dragon.com/
#######################################

LATESTLOG="/b_d/e.d/sync/latest"
[ -z $1 ] || LATESTLOG="$1"
OUTFILE="g.sh"
DELFILE="d.sh"
SEDFILE=delthis.sed

cat > $SEDFILE <<SEDFILEENDS
1{s/.*/#!\/usr\/bin\/bash\n> $DELFILE/;p;d}
s/\\\$/\\\\\$/g
/#S\[ource\]     : /{
s/#S\[ource\]     : //
h;d
}
/#D\[estination\]: /{
s/#D\[estination\]: //
H;d
}
/^#/d
/^d/{
s/..//
/\*$/{
G
s/\(.*\)\n\(.*\)\n\(.*\)/\2\n\3\n\1/
s/\(.*\)\n\(.*\)\n\1\(.*\)/\2\3/
s/\\\$/\\\\\\\\\$/g
s/!/\\\\!/g
s/\(.*\)\*$/mkdir -p "\1" || echo "Failed to create directory \1"/
}
/^\*/{
s/\\\$/\\\\\\\\\$/g
s/!/\\\\!/g
s/\*\(.*\)/echo rmdir "\\\\"\1\\\\"" >> $DELFILE/
}
p;d
}
s/..//
/\*$/{
s/\(.*\)\*$/\1\n\1/
G
s/\(.*\)\n\(.*\)\n\(.*\)\n\(.*\)/\3\n\4\n\1\n\2/
s/\(.*\)\n\(.*\)\n\(.*\)\n\1\(.*\)/cp -P "\3" "\2\4" || echo "Failed to copy \3"\ntouch -h -r "\3" "\2\4"/
}
/^\*/{
s/\\\$/\\\\\\\\\$/g
s/!/\\\\!/g
s/\*\(.*\)/echo "rm \\\\"\1\\\\"" >> $DELFILE/
}
/..*\*..*/s/\(.*\)\*\(.*\)/cp -P "\1" "\2" || echo "Failed to copy \1"\ntouch -h -r "\1" "\2"/


# The reversing step! Refer main script comment for reason.
\$s/.*/&\nsed -i '1!G;h;\$!d;s\/^\/#!\\\\\/usr\\\\\/bin\\\\\/bash\\\\n\/' $DELFILE/
SEDFILEENDS

sed -f $SEDFILE $LATESTLOG > $OUTFILE

rm $SEDFILE