#!/bin/bash
# moviejoin: Gnome Nautilus script for joining avi and mpeg movie clips
#            partial movie clips get moved to Trash after successful completion 
# version: 1.0beta
# depends on: avimerge, mpgtx (mpgjoin), file, [gdialog]
# author: Fernando Fernandez Pedraza, http://www.fpedraza.com
# license: GPL, see http://www.gnu.org/copyleft/gpl.html
# to-do: process more file formats with some extra conversion utilities

# options: edit the appropriate variables below to change options.
#  askfilename : asks user for outputfilename or not. if not, the 
#                output filename is the first filename with the 'suffix' 
#                appended to basename
#  usegdialog : uses gdialog or not. (can be used from command line and/or
#               non-graphical mode.
#  suffix: see 'askfilename' above.
#  
#  order of file joining: uses order in Nautilus screen, you might need
#  to experiment a little for getting correct results.

askfilename=1
usegdialog=1
suffix="-joined"

shopt -s nullglob

i=1
error=0
list=""
filebase=""
fileext=""

function printerror {
        # $1=error type
        # $2=use gdialog or not
        errorstring[1]="error: file types differ"
        errorstring[2]="error: file type not supported"

        if [[ $2 = 0 ]] ; then
                echo ${errorstring[$1]}
        else
                gdialog --title "moviejoin" --msgbox "${errorstring[$1]}" 100 100       
        fi
}


# get info about files
for file in $@
        do 
                pat=`file -b "$file"`
                filetype[$i]=${pat:0:4}
                
                if [[ $i = 1 ]] ; then
                        firstfilename=$file 
                        filebase=${file%%.*}
                        fileext=${file#*.}
                fi

                # compare all file types with type of file no. 1
                if [[ ${filetype[i]} = ${filetype[1]} ]] ; then
                        list=`echo \"${file}\" ${list}`
                else
                        error=1
                        break [2]
                fi

                ((i++))
        done


# join files
if [[ $error != 1 ]] ; then
        if [[ $askfilename = 1 ]] ; then 
                outputfile=`gdialog --title "moviejoin" --inputbox "Output filename:" 100 100 2>&1`
        else
                outputfile=`echo ${filebase}${suffix}.${fileext}`
        fi

        if [[ ${filetype[1]} = RIFF ]] ; then
                command="avimerge -i ${list} -o ${outputfile}" 
        elif [[ ${filetype[1]} = MPEG ]] ; then 
                command="mpgjoin -o ${outputfile} ${list}" 
        else 
                command="printerror 2 $usegdialog"
        fi

        #gdialog --msgbox "${list}"
        eval $command

        # if outputfile exists and nonzero move input files to trash
        if [[ -s ${outputfile} ]] ; then eval "mv ${list} ${HOME}/.Trash/"  ; fi
        
        else
                printerror 1 $usegdialog
fi