bleed AI

/*
* set bleeds
* Rob Day 2022
*/

//the tolerance in points
var bt = 10;

//doc bleeds
var tb,bb,rb,lb;

function adjustBleeds(){
    if (app.documents.length == 0) {
        alert("No Documents Open")
        return
    } 
    app.scriptPreferences.measurementUnit = MeasurementUnits.POINTS;
    var d = app.activeDocument;
    var dp = d.documentPreferences;
    d.zeroPoint = [0,0];
    d.viewPreferences.rulerOrigin = RulerOrigin.PAGE_ORIGIN;
    
    //get bleed settings
    tb = dp.documentBleedTopOffset;
    bb = dp.documentBleedBottomOffset;
    rb = dp.documentBleedOutsideOrRightOffset;
    lb = dp.documentBleedOutsideOrRightOffset;
    if (!dp.facingPages) {
        lb = dp.documentBleedInsideOrLeftOffset;
    }
    //the document’s page items
    var pi = d.allPageItems;
    for (var i = 0; i < pi.length; i++){
        if (pi[i].constructor.name == "Rectangle" || pi[i].constructor.name == "TextFrame") {
            setBleed(pi[i])
        } 
    };   
    app.scriptPreferences.measurementUnit = AutoEnum.AUTO_VALUE;
}

app.doScript(adjustBleeds, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Adjust bleeds');


/**
* Sets a page item that is within a tolerance (bt) to the page bleed offsets
* Sets rectangles and text frames only
* @ param a page item 
* @ return void 
*/
function setBleed(pi){
    //check if the page item is on the pasteboard
    if (pi.parentPage == null) {
        return
    }
    var pp = pi.parentPage;
    var px = pp.index;
    var pc = pp.parent.pages.length-1;
    var ps = pp.side;

    //page width and height
    var ph = pp.bounds[2]-pp.bounds[0];
    var pw = pp.bounds[3]-pp.bounds[1];

    var b = pi.geometricBounds;
    var ba = b;
    var ti = [0,0,0,0];
    var sc;
    
    //set top bleed
    if (b[0] < bt) {
        ba[0] = -tb
        if (pi.constructor.name == "TextFrame") {
            sc = 100/pi.absoluteVerticalScale
            ti[0] = (pi.textFramePreferences.insetSpacing[0]+tb+pi.geometricBounds[0])*sc 
            ti[1] = pi.textFramePreferences.insetSpacing[1];    
        } 
    } 
    //set bottom bleed
    if (b[2] > ph-bt) {
        ba[2] = ph + bb;
        if (pi.constructor.name == "TextFrame") {
            sc = 100/pi.absoluteVerticalScale
            ti[2] = (pi.textFramePreferences.insetSpacing[2]+bb)*sc
            ti[0] = pi.textFramePreferences.insetSpacing[0];
        } 
    }
    //set left bleed
    if (ps == PageSideOptions.LEFT_HAND || ps == PageSideOptions.SINGLE_SIDED && px == 0 && b[1] < bt) {
        ba[1] = -lb
        if (pi.constructor.name == "TextFrame") {
            sc = 100/pi.absoluteHorizontalScale
            ti[1] = (pi.textFramePreferences.insetSpacing[1]+lb+pi.geometricBounds[1])*sc
            ti[3] = pi.textFramePreferences.insetSpacing[3];
        } 
    } 
    //set right bleed
    if (ps == PageSideOptions.RIGHT_HAND || ps == PageSideOptions.SINGLE_SIDED && px == pc && b[3] > pw - bt) {
        ba[3] = pw + rb;
        if (pi.constructor.name == "TextFrame") {
            sc = 100/pi.absoluteHorizontalScale
            ti[3] = (pi.textFramePreferences.insetSpacing[3]+rb)*sc
            ti[1] = pi.textFramePreferences.insetSpacing[1];
        } 
    }
    pi.geometricBounds = ba

    if (pi.constructor.name == "TextFrame") {
        pi.textFramePreferences.insetSpacing = ti;
    }
}