Script to convert all diagonals to 45 degrees?

Try to think like the script. If you were the script and I instructed you to "convert all selected segments into perfect 45 degree segments," what would you take that to mean?

Scripts cannot perform ambiguous instructions.

For example, consider a single closed path which was drawn with the Polygon Tool, and has 5 equal length segments (i.e., a pentagon). What would "make all segments into 45 degree segments" mean?

Rotate each segment about its center such that it is literally angled at what Illustrator's coordinate system considers 45 degrees (the angle 45 degrees counter-clockwise from horizontal)? All segments would end up at the same angle, and the result would look like a single 45 degree line.

Rotate each segment such that it makes a 45 degree angle with its adjacent segment? That leads to "but what if" questions requiring decisions which have to lead to geometrically possible answers.

Are the segments to remain connected as a single, closed path? If so, how do you reconcile that five 45 degree angles total only 225 degrees, not 360 degrees? An equilateral polygon consisting of only 45 degree angles is an octagon. How and where is the script supposed to add the three missing segments?

See what I mean? When writing a script, you have to be able to explain what you want to occur in explicit statements which covers all possible circumstances and what to do in each circumstance. That's  what is meant by "pseudo-code." Try to write out in normal language what specific steps the script should perform. Test the logic of those instructions by thinking them through in any given situation and see if you can mentally perform them without running into ambiguities or impossibilities.

JET