MarshySwamp

// No GUI
$.evalFile(File('~/Desktop/myScript.jsx'));

$.evalFile(File(app.path.fsName + "/Presets/Scripts/Fit Image.jsx"));

// or

$.evalFile(File($.fileName).path + '/myScript.jsx')

// or

MarshySwamp

/* 
NOTES:
The channels array is zero indexed, channels[0] is at the top/head of the channels panel
The top-level "primary/composite" of the ChannelType.COMPONENT is not included in the individual layer count
*/


// Save the current active channels
var savedChannelState = app.activeDocument.activeChannels;

MarshySwamp

// Expand ALL layer groups/sets
openAllLayerSets(app.activeDocument);

function openAllLayerSets(parent) {
    // https://forums.adobe.com/message/5764024#5764024
    for (var setIndex = 0; setIndex < parent.layerSets.length; setIndex++) {
        app.activeDocument.activeLayer = parent.layerSets[setIndex].layers[0];
        openAllLayerSets(parent.layerSets[setIndex]);
    }
}

MarshySwamp

function main() {
    alert("This is a declared function and is invoked by calling it by name from suspend history.");
}
app.activeDocument.suspendHistory("Run script", "main()");

// or

(function (){
    alert("This is an anonymous self-invoking function! Also known as an 'Immediately Invoked Function Expression' or (IIFE).");
}());

MarshySwamp

toggleActiveLayerVisibility(true);

function toggleActiveLayerVisibility(toggleOptionsPalette) {
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    var list = new ActionList();
    var reference = new ActionReference();
    reference.putEnumerated(s2t("layer"), s2t("ordinal"), s2t("targetEnum"));

MarshySwamp

// Centre active layer on canvas
var doc = app.activeDocument;
var docLay = app.activeDocument.activeLayer;
docLay.translate(doc.width / 2 - (docLay.bounds[0] + docLay.bounds[2]) / 2, 
doc.height / 2 - (docLay.bounds[1] + docLay.bounds[3]) / 2);

MarshySwamp

moveLayerRelativeStack("previous"); // "previous" or "next" or "front" or "back"

function moveLayerRelativeStack(relPos) {
	var c2t = function (s) {
		return app.charIDToTypeID(s);
	};
	var s2t = function (s) {
		return app.stringIDToTypeID(s);
	};
	var descriptor = new ActionDescriptor();

MarshySwamp

/* Presuming that a layer has a unique name (otherwise the first layer with the name will be targeted) */

var selectLayer1 = app.activeDocument.artLayers.getByName("Layer 1");
app.activeDocument.activeLayer = selectLayer1;
 

/* or */

app.activeDocument.activeLayer = app.activeDocument.layers["Layer 1"];

MarshySwamp

/////////// ACTIVE LAYER INSPECTOR v1.8, 6th January 2022 ///////////
/////////////// Displays info about the current layer ///////////////

/* https://community.adobe.com/t5/photoshop/could-you-select-all-layers-sequentially/m-p/11741392 */

/* Name = Not unique */
/* itemIndex = Changes with layer addition/removal, Background layer index starts at 0 - no Background starts at 1 */
/* layer.id = Unique, Static */

//    Bounds:

MarshySwamp

/* open selected files from folder */

//community.adobe.com/t5/photoshop/open-selected-files/m-p/11632735

var aFile = selectFile(true);
for (var i = 0; i < aFile.length; i++) {
    open(File(aFile[i]));
}
////// select file //////
function selectFile(multi) {