// psdExportText_selectedL_File - Adobe Photoshop Script
// Requirements: Adobe Photoshop CS3, or higher, OS X only (for now)
// Description: exports selected layers (if text) to separate text files
// Version: 0.9.0
// Author: Matt Irwin
// Website: http://www.thunderouscrickets.com
// ============================================================================
// Installation:
// Setup Shell Script
// 1. Place script in '/Applications/Adobe\ Photoshop\ CS#/Presets/Scripts/'
// 2. Restart Photoshop
// 3. Choose File > Scripts > psdExportText_selectedL_File
// ============================================================================

var mSelectFolder, mFilePrefix;
function main() {
	mSelectFolder = Folder.selectDialog("Select location to save files");
	mFilePrefix = prompt("Enter filename prefix");
	exportSelectedLayersCollection();
}
function exportTextFromLayer(count) {
	var currentLayer = activeDocument.activeLayer;
	
	if (currentLayer.kind == LayerKind.TEXT) {
		//alert(currentLayer.textItem.contents);
		var cfilePath = mSelectFolder + "/"+mFilePrefix+"_"+count+".txt";
		var cfile = new File(cfilePath);
		cfile.lineFeed = "Unix";
		cfile.open("w");
		cfile.seek(0);
		cfile.writeln(currentLayer.textItem.contents);
		cfile.close();
	}
}
function exportSelectedLayersCollection(){
     var selectedLayers = getSelectedLayersIdx();
     for( var l = 0;l < selectedLayers.length; l++){
          makeActiveByIndex( selectedLayers[ l ], false );
          exportTextFromLayer(l);
     }
     makeActiveByIndex( selectedLayers, false );
}
function hasBackground(){
    var res = undefined;
    try{
        var ref = new ActionReference();
        ref.putProperty( 1349677170 , 1315774496); 
        ref.putIndex( 1283027488, 0 );
        executeActionGet(ref).getString(1315774496 );; 
        res = true;
    }catch(e){ res = false}
    return res;
}
function getSelectedLayersIdx(){
     var selectedLayers = new Array;
     var ref = new ActionReference();
     ref.putEnumerated( charIDToTypeID('Dcmn'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
     var desc = executeActionGet(ref);
     if( desc.hasKey( stringIDToTypeID( 'targetLayers' ) ) ){
          desc = desc.getList( stringIDToTypeID( 'targetLayers' ));
          var i = 0;
          var c = desc.count;
          var offset = 0;
          var selectedLayers = new Array();
          if(!hasBackground()){
          	offset = 1;
          }
          for(i;i<c;i++){
          	var temp = parseInt(desc.getReference(i).getIndex()) + offset;
          	selectedLayers.push(temp);
          }
     }else{
          var ref = new ActionReference(); 
          ref.putProperty( charIDToTypeID('Prpr') , charIDToTypeID( 'ItmI' )); 
          ref.putEnumerated( charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
          selectedLayers.push( executeActionGet(ref).getInteger(charIDToTypeID( 'ItmI' )));
     }
     return selectedLayers;
}
function makeActiveByIndex( idx, visible ){
     if( idx.constructor != Array ) idx = [ idx ];
     for( var i = 0; i < idx.length; i++ ){
          var desc = new ActionDescriptor();
          var ref = new ActionReference();
          ref.putIndex(charIDToTypeID( 'Lyr ' ), idx[i])
          desc.putReference( charIDToTypeID( 'null' ), ref );
          if( i > 0 ) {
               var idselectionModifier = stringIDToTypeID( 'selectionModifier' );
               var idselectionModifierType = stringIDToTypeID( 'selectionModifierType' );
               var idaddToSelection = stringIDToTypeID( 'addToSelection' );
               desc.putEnumerated( idselectionModifier, idselectionModifierType, idaddToSelection );
          }
          desc.putBoolean( charIDToTypeID( 'MkVs' ), visible );
          executeAction( charIDToTypeID( 'slct' ), desc, DialogModes.NO );
     }     
}

function isCorrectVersion() {
	if (parseInt(version, 10) >= 10) {
		return true;
	}
	else {
		alert('This script requires Adobe Photoshop CS3 or higher.', 'Wrong Version', false);
		return false;
	}
}

function isOpenDocs() {
	if (documents.length) {
		return true;
	}
	else {
		alert('There are no documents open.', 'No Documents Open', false);
		return false;
	}
}

function showError(err) {
	if (confirm('An unknown error has occurred.\n' +
		'Would you like to see more information?', true, 'Unknown Error')) {
			alert(err + ': on line ' + err.line, 'Script Error', true);
	}
}

if (isCorrectVersion() && isOpenDocs()) {
	try {
		activeDocument.suspendHistory('Export Selected TextLayers to Clipboard', 'main()');
	}
	catch(e) {
		if (e.number != 8007) { // don't report error on user cancel
			showError(e);
		}
	}
}