How to automatically set optimal frame width of Emacs?

Question

How to automatically set optimal frame width of Emacs?

When open a file with Emacs from command line, how to let it automatically set the frame size such that

• width is 2 characters wider than the widest row or the computer screen width, which ever is smaller

• height is 80 rows, or the computer screen height, which ever is smaller?

Answer 1

You can use a find-file-hook which sets your frame's size. You'll need things like display-width and display-height, and you'll need to loop through the whole file computing the width of each line (using forward-line to move to the next line, end-of-line to go the end of the line and current-column to find the width). And you'll probably need to fiddle with off-by-one details in order to account for things like the menu-bar, the fringes, ...

Me? I prefer to declare that files should not go over 80 columns so I don't need to adjust the frame width.

Answer 2

This is just what libraries fit-frame.el and autofit-frame.el are for. See also http://www.emacswiki.org/FrameSize .