For someone who might need it, here is what worked for me.
function appendMasterSpreadsPages(doc)
{
app.transformPreferences.whenScaling = WhenScalingOptions.adjustScalingPercentage;
app.transformPreferences.transformationsAreTotals = false;
var numMasterSpreads = doc.masterSpreads.count();
for (var i = 0; i < numMasterSpreads; i++)
{
var masterSpread = doc.masterSpreads[i];
var numMasterPages = masterSpread.pages.count();
// this adds new spread based on masterSpread with a few pages (not necessarily same number of pages as in the masterSpread)
// it will most likely be 1 page for a document with no facing pages, or 2 for a documen with facing pages
// these pages will have no spread applied at this time
var spread = doc.spreads.add(LocationOptions.AT_END, doc, { appliedMaster : NothingEnum.NOTHING });
// allow moving pages into spread
spread.allowPageShuffle = false ;
// make sure to remove or add pages to match what we have in a spread
if (spread.pages.count() !== numMasterPages)
{
// remove extra pages if any
while (spread.pages.count() > numMasterPages)
spread.pages[spread.pages.count()-1].remove();
// add pages if necessary
var numMissingPages = numMasterPages - spread.pages.count();
while (numMissingPages-- > 0)
{
// new page could be added to a new spread rather than current spread, need to move it to the required spread
var newPage = doc.pages.add({appliedMaster : NothingEnum.NOTHING});
if (newPage.parent !== spread)
newPage.move(LocationOptions.AT_END, spread, BindingOptions.DEFAULT_VALUE);
}
}
// with facing pages we need to make sure pages are on the correct side of the binding
// it is only necessary if number of pages is 1 or 2. For other number of pages
// binding side does not change the master page applied.
if (doc.documentPreferences.facingPages)
{
// find first page on the right of the binding
var p = 0;
while (p < masterSpread.pages.count() && masterSpread.pages[p].side == PageSideOptions.LEFT_HAND)
p++;
// pages which are on the left of the binding must be moved to start of the spread from last to first
// we could move from first to last but then we would need a reference to the already moved page
// so its easier to move to the start of the spread
var pl = p-1;
while (pl >= 0)
{
spread.pages[pl].move(LocationOptions.AT_BEGINNING, spread, BindingOptions.LEFT_ALIGN);
pl--;
}
// pages which are on the right of the binding must be moved to end of the spread from left to right
pl = p;
while (pl < spread.pages.count())
{
spread.pages[pl].move(LocationOptions.AT_END, spread, BindingOptions.RIGHT_ALIGN);
pl++;
}
}
// now apply master to pages and assign labels
for (var j = 0; j < masterSpread.pages.count(); j++)
{
var page = spread.pages[j];
var master= masterSpread.pages[j];
// this will apply master including its size to page
page.appliedMaster = masterSpread;
// label the master page so that it knows which page represents it
master.label = page.name;
// SxHxR: apply scale, shear and rotation transforms from the mastetPage, do not apply translation
// these we can simply replace in target matrix, however translate needs special treatment later
var masterMatrix = master.transformValuesOf(CS.SPREAD_COORDINATES)[0].matrixValues;
page.transform(
CS.INNER_COORDINATES,
[[0,0], CS.INNER_COORDINATES],
masterMatrix,
[MatrixContent.ROTATION_VALUE, MatrixContent.SCALE_VALUES, MatrixContent.SHEAR_VALUE],
false);
// T: apply translate transform, except for the first page.
// the trick here is that we cannot position page relative to the spread because
// InDesign recalculates coordinates for the spread and all the pages in it after every change
// instead use bounds to position pages relative to each other
// first page remains where it is, used as a refrerence for the 2nd page, whereas 2nd page is a reference to 3rd, etc.
// I still do not quite understand why bounds work whereas translation values in the matrix do not
var refIndex = j - 1;
if (refIndex >= 0)
{
var refPage = spread.pages[refIndex];
var refMaster = masterSpread.pages[refIndex];
var dx = refPage.bounds[1] - page.bounds[1] + master.bounds[1] - refMaster.bounds[1];
var dy = refPage.bounds[0] - page.bounds[0] + master.bounds[0] - refMaster.bounds[0];
page.transform(
CS.PASTEBOARD_COORDINATES,
[[0,0], CS.INNER_COORDINATES],
[1, 0, 0, 1, dx, dy],
[],
false);
}
}
}
}
It works on all the documents I have, but may not work for something I have not seen just yet. So if you are good with InDesign geometery and see how it could be fixed or improved, please update this solution for the benefit of everyone.
Thanks!
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