stitchfour.js

// use case:  i have four strips of a page open in photoshop. I want to add the next three onto this current one, 
// resizing the canvas to accommodate the new addition

// Get current document
var doc = app.activeDocument;

var docPath = doc.fullName.path.replace(/^~/, '/Users/userpath');

// Get current file name 
var currentFile = doc.name;

var pad = '000';

// Extract the number from the file name 
var currentNumber = parseInt(currentFile.replace(/^image\-(\d+)\..*$/i, '$1'), 10) ;

// alert(currentNumber);

var nextfile2num = (pad + (currentNumber+1)).slice(-pad.length)
var nextfile3num = (pad + (currentNumber+2)).slice(-pad.length)
var nextfile4num = (pad + (currentNumber+3)).slice(-pad.length)

// Construct the next three file names 
var nextFile1 = currentFile.replace(/\-(\d+)\.jpg/, '-' + nextfile2num + '.jpg')
var nextFile2 = currentFile.replace(/\-(\d+)\.jpg/, '-' + nextfile3num + '.jpg')
var nextFile3 = currentFile.replace(/\-(\d+)\.jpg/, '-' + nextfile4num + '.jpg')

// Open the next two files
var nextDoc1 = app.open(File(docPath + '/' + nextFile1)); 

// Select all of the layers in the new docs 
var nextLayer1 = nextDoc1.layers[0];

// Copy the layers
nextLayer1.copy();

// Select the first layer in the original doc
var layer = doc.layers[0];

// Calculate new canvas size
var oldCanvasWidth = doc.width;
var newCanvasWidth = oldCanvasWidth + nextDoc1.width;

// switch back to first dock
app.activeDocument = doc;

// Resize the canvas 
doc.resizeCanvas(newCanvasWidth, doc.height, AnchorPosition.MIDDLERIGHT);


var pastedLayer = doc.paste();
pastedLayer.translate(-(parseInt(nextDoc1.width) / 2),0);


// Close the new docs
nextDoc1.close(SaveOptions.DONOTSAVECHANGES);

// second image to add
var nextDoc2 = app.open(File(docPath + '/' + nextFile2));
var nextLayer2 = nextDoc2.layers[0];
nextLayer2.copy();
var oldCanvasWidth = doc.width;
var newCanvasWidth2 = oldCanvasWidth + nextDoc2.width;

app.activeDocument = doc;

doc.resizeCanvas(newCanvasWidth2, doc.height, AnchorPosition.MIDDLERIGHT);
// var layer = doc.layers[0];
var pastedLayer2 = doc.paste();
pastedLayer2.translate(-(parseInt(nextDoc2.width)),0);


nextDoc2.close(SaveOptions.DONOTSAVECHANGES);  


// third image to add
var nextDoc3 = app.open(File(docPath + '/' + nextFile3));
var nextLayer3 = nextDoc3.layers[0];
nextLayer3.copy();
var oldCanvasWidth2 = doc.width;
var newCanvasWidth3 = oldCanvasWidth2 + nextDoc3.width;

app.activeDocument = doc;

doc.resizeCanvas(newCanvasWidth3, doc.height, AnchorPosition.MIDDLERIGHT);
// var layer = doc.layers[0];
var pastedLayer3 = doc.paste();
// alert('oldCanvasWidth2 ' + oldCanvasWidth2);
pastedLayer3.translate(-(parseInt(parseInt(newCanvasWidth3) / 2) - parseInt(parseInt(nextDoc3.width) / 2)),0);




nextDoc3.close(SaveOptions.DONOTSAVECHANGES);  


if (confirm('is this ok?')) {
	var jpegOptions = new JPEGSaveOptions();
	jpegOptions.quality = 7;
	doc.saveAs(new File(docPath + '/../' + doc.name), jpegOptions, true, Extension.LOWERCASE);
}