OK, so here's a variant of tomaxxi's script that actually reads the EDID size information.
There's a lot to go wrong here, so it might not work for you. I'm not near any multiple-monitor macs at the moment, so I can't test it on one of those, so in particular the ioreg command may read the EDID info for the wrong monitor.
According to Wikipedia, the millimeter sizes at offsets 66,67, and 68 into the EDID info are only valid for non-null pixel clocks (bytes 54-55). In my case that's what I have, but you might not. Also, this reads from Descriptor Block 1, I don't know when to pick which descriptor block to use (I am too lazy to go figure it out, I guess...). I suppose you could easily fall back to using bytes 21 and 22, the maximum sizes, as a commented out earlier version of the script did.
Also, if the EDID info is for the correct monitor, I might not be using the correct entry in the ExtendScript $.screens array. I pick 0, and again, am too lazy to go grab the spec to see which one is right. (Not that it's clear how to decide which monitor to use...)
Oh, also, I calculate based on the horizontal resolution (better precision? Ha!). Since ID doesn't let you set the horizontal zoom independent of the vertical zoom (thank goodness!), we have to pick one anyhow... I suppose I could have gone with the diagonal (best of both worlds?), but that was more math and made things more complicated anyhow...
tomaxxi, I am mystified why you use a function to set myScreen, and also why you do all that string manipulation...anyhow, I rewrote that part.
Oh, and because I am disinclined to do string maniuplation in AppleScript, this is written in JavaScript, which has no support for executing shell scripts, and you need to run the ioreg command to get EDID info. So we have my function shell() which quotes the arguments and passes them to AppleScript so it can pass them to the shell. Oof. Here you go -- oh yes, M Blackburn, you can just paste in JavaScript:
function shell(cmd) {
var
rv,
call ='do shell script "'+
cmd.replace(/\\/g,"\\\\").replace(/"/g,'\\"')+
'"';
try {
rv = app.doScript(call,
ScriptLanguage.APPLESCRIPT_LANGUAGE);
} catch(e0) {
rv = e0+"\n"+(rv?"":rv);
}
return rv;
}
(function() {
var raw, hex, i, edid = [], hin, hmm, hmmhi,
zoomTo, hrez, myZoom;
raw = shell('ioreg -Srk IODisplayEDID -w 0 | grep IODisplayEDID');
hex = raw.replace(/.*<(.*)>.*/,"$1");
for (i = 0; i<(hex.length/2); i++) {
edid = parseInt(hex.substr(i*2,2),16);
}
//http://en.wikipedia.org/wiki/Extended_display_identification_data
// hcm = edid[21]; // 21: max horizontal size (cm)
hmmhi = (edid[68] & 0xf0) << 5;
hmm = hmmhi | edid[66];
hin = hmm/25.4;
if(app.documents.length){
zoomTo = 100;
hrez = $.screens[0].right-$.screens[0].left;
myZoom = Math.round(hrez/hin/72*100);
app.activeWindow.zoomPercentage = myZoom * (zoomTo / 100);
}
}());
Edit: reads the "EDID size" information not the "EDID resolution" information -- whoops!
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