A script to batch rename and relink images?

Question

Hello, everyone!
First of all, I did search for this before asking and found many similar scripts for this, but as I don't know how to make or edit scripts, I couldn't use them...
I work at a company that makes school books. Each InDesign file we make can have hundreds of images, of varied extensions (.ai, .eps, .tif, .psd).
We now need to rename those images to a default naming system we defined. This is taking hours, even days to do manually.
Those images currently have varied names, so we'd need to ignore what's there, we just need a configurable prefix (like "EF6_ESP_C1_"), then a 4-digit number starting at 0001 and numbering the rest (if there's say a .tif and then a .ai, it'd have to be 0001.tif and 0002.ai), then the extension it already had.
Preferably, but not required, if it could read that the image already had an "EQ" in the file name, it could rename them to another prefix and count those separately from 0001, as we work Equation images separately, but if this can't be done or is too difficult to do, then just have them named and numbered with the others.
Could anyone be so kind as to help me with this? Thank you very much!

Answer 1

Try this,
var doc = app.activeDocument,
    links = doc.allGraphics, count = 1, eqcount = 1, a = "0000";
for(var i=links.length-1;i>=0;i--)
        if(links[i].itemLink.name.match(/^EQ.+/))
                var ext = links[i].itemLink.name.substr(links[i].itemLink.name.lastIndexOf(".")),
                    old = File(links[i].itemLink.filePath),
                    eqnum = (eqcount++).toString(),
                    newname = "EQ_EF6_ESP_C1_" + a.substring(0, a.length - eqnum.length) + eqnum + ext;
                old.rename(newname);
                links[i].itemLink.relink(File(old.toString().replace(links[i].itemLink.name,newname)))
        else
                var ext = links[i].itemLink.name.substr(links[i].itemLink.name.lastIndexOf(".")),
                    old = File(links[i].itemLink.filePath),
                    num = (count++).toString(),
                    newname = "EF6_ESP_C1_" + a.substring(0, a.length - num.length) + num + ext
                old.rename(newname);
                links[i].itemLink.relink(File(old.toString().replace(links[i].itemLink.name,newname)))
Please note:It is not reversible.
Regards,
Chinna