#!/bin/sh
# This expects one argument: the name of the EPUB to edit.

# Modify these if the programs were installed elsewhere
ZIP=/mnt/ext1/system/bin/zip
UNZIP=/mnt/ext1/system/bin/unzip
PI=/mnt/ext1/applications/pi.app
SH_IVTOOL=/mnt/ext1/system/bin/sh_ivtool.app


# The rest should be system independent.


# This is where we temporarily unpack the EPUB files.
# (It has to be inside a Unix directory, because unpacking and packing
#  within a FAT directory seems to produce invalid EPUB files.)
BASENAME=`basename "$1"`
TMPDIR="/tmp/${BASENAME}.dir"

# Delete the temporary files later, no matter how we leave.
trap 'rm -rf "$TMPDIR"' 0

# Unpack the files.
mkdir -p "$TMPDIR"
cd "$TMPDIR"
$UNZIP -q -u "$1" -d "$TMPDIR"

if [ $? -gt 0 ]; then
  $SH_IVTOOL -s "Problems while unzipping.  Giving up!"
  exit -1
fi

EXT=`$SH_IVTOOL -t "Enter filename extension (or leave blank to see all files)"`

# Edit whatever files are chosen
$SH_IVTOOL -s "Select file(s) to edit, or click Back button to exit selection"
DO_MORE=1
while [ $DO_MORE -eq 1 ]; do
  FILE=`$SH_IVTOOL -f "$TMPDIR" "$EXT"`
  if [ $? -eq 0 ]; then
    $PI "$FILE"
  else
    DO_MORE=0
  fi
done

# Get the name of the output file
NEWFILE=`basename "$1"`
RESP=`$SH_IVTOOL -q "Overwrite the old file?"`
if [ $? -ne 0  -o  "$RESP" == 'n' ]; then
  NEWFILE=`$SH_IVTOOL -t "Enter new file name (without .epub), or leave blank to discard"`.epub
  if [ $? -ne 0 ]; then
    $SH_IVTOOL -s "No filename given.  Discarding results."
    exit -1
  fi
fi

# Zip up the contents
$ZIP "$NEWFILE" -0 mimetype
$ZIP -r "$NEWFILE" * -x mimetype

# Move the new file into the same directory as the old file
# (overwriting it if the names are the same)
mv "$NEWFILE" `dirname "$1"`