#!/bin/sh

# Shell script to sync Emacs-wiki and Palm MemoDB

# Author: Richard Klinda <ignotus@my.gnus.org> (TMDA)
# Last modified: Monday, March 14, 2005
# URL: http://ignotus.linuxforum.hu/WikiSync.html

# !!! Make sure that all the wiki files' last line is a NEWLINE!

## ---(:excerpt-beg save-buffer-defadvice :name 403de639)---
## ---(:excerpt-source "../.xemacs/init.el")---
#(defadvice save-buffer (before newline-for-wiki-files last activate)
#  "Make sure that the last line of emacs-wiki files is NEWLINE."
#  (when (and (eq major-mode 'emacs-wiki-mode)
#             (buffer-modified-p))
#    (save-excursion
#      (goto-char (point-max))
#      (unless (looking-at "^$")
#        (insert "\n")))))
## ---(:excerpt-end save-buffer-defadvice :name 403de639)---

# set these three variables:
STATUSDIR=~/.wikisync
WIKIDIR=~/.Wiki
CATEGORY_ON_PALM="Wiki"

# do you want automagic diffs?
AUTODIFF=1

# ############################################################### code ###

function my_md5sum () {
    echo "`cat $1 | /usr/bin/md5sum | cut -f 1 -d ' '`"
}

function md5_cache () {
    echo "`cat $STATUSDIR/md5sums | grep \ $1\$ | cut -d ' ' -f 1`"
}

currentdir=`pwd`

if [ ! -e $STATUSDIR ]
then
    mkdir $STATUSDIR
fi

cd $STATUSDIR

if [ -e lastsynctime ]
then
    lastsynctime=`cat lastsynctime`
fi

if [ -e memos ]
then
    rm -rf memos
fi

mkdir memos
mkdir memos/$CATEGORY_ON_PALM

echo I\'ll download the memos from your palm now, press Sync on your
echo Palm, then press RET here!
read

cd memos
memos -c "$CATEGORY_ON_PALM" -s .

palmnum=`find . | wc -l`
pcnum=`find $WIKIDIR | wc -l`

cd $CATEGORY_ON_PALM

for i in *;
do
    # cut the first line
    cat $i | tail -$[ `wc -l < $i` - 1 ] > $i.tmp && mv $i.tmp $i

    md5sum_pc=""

    md5sum_palm=`my_md5sum $i`

    # if the file exists on the PC too
    if [ -e $WIKIDIR/$i ]
    then
        md5sum_pc=`my_md5sum $WIKIDIR/$i`
        if [ ! "$md5sum_pc" = "$md5sum_palm" ]
        then
            # the file is changed, now we have to find out which changed or
            # maybe both changed?
            md5sum_old=`md5_cache $i`

            if [ "$md5sum_old" = "$md5sum_pc" ]
            then
                echo ... $i changed on Palm, copying to PC
                cp $i $WIKIDIR/
            elif [ "$md5sum_old" = "$md5sum_palm" ]
            then
                echo ... $i changed on PC \(will be copied to Palm\)
            else
                echo ... WOOPS $i CHANGED on Palm and PC too, changes on the
                echo     Palm will be lost!
                conflict="yes"
                if [ $AUTODIFF = "1" ]
                then
                    echo _____ diff $WIKIDIR/$i $i _____
                    diff -u $WIKIDIR/$i $i
                fi
            fi
        fi
    else                        # the file doesn't exist on the PC
        # There are two possibilities:
        #   - the user deleted the file on the PC;
        #   - the user created a new Wiki entry on the Palm.

        if [ -z `md5_cache $i` ]
        then
            echo ... $i is a new Wiki file on Palm, copying to PC
            cp $i $WIKIDIR/
        else
            echo ... $i is obsolete entry on Palm \(will be deleted\)
        fi;
    fi;
done

echo Now writing back the memos to the Palm, press Sync on
echo "your palm, then press RET here!"

if [ "$conflict" = "yes" ]
then
    echo
    echo "!!! You have one or more wiki files changed on both the PC and"
    echo "    the Palm, changes on the Palm will be lost, but now you can"
    echo "    take a look at your Palm wiki files in $STATUSDIR/$CATEGORY_ON_PALM"
    echo "    and edit your PC files to have the information.  Don't forget"
    echo "    to save then press RET here."
fi

if [ ! "$palmnum" = "$pcnum" ]
then
    echo
    echo "Different number of Wiki files:"
    echo "      Palm: $palmnum memo entries"
    echo "        PC: $pcnum memo entries"
    echo "It's probably ok, but sometimes pilot-xfer does weird things..."
    echo "Press RET to continue."
fi

read

cd $WIKIDIR

md5sum * > $STATUSDIR/md5sums
date +%s > $STATUSDIR/lastsynctime

install-memo -c $CATEGORY_ON_PALM -rt *

cd $currentdir

# Script ends here.