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;; Maintain at least 80 columns, even when the Emacs window is resized
;; Brandon Rhodes
;; The largest and smallest acceptible font sizes, in tenths of points.
(setq maximum-font-height 136)
(setq minimum-font-height 60)
;; The window change function gets called not only for frame resizing
;; but during more minor events as well, so we remember the previous
;; width of each frame so that we only kick into action when the frame
;; is actually resized.
(setq current-frame-widths (make-hash-table :test 'eq))
;; Our window size change function itself, which hunts through font
;; sizes in large-to-small order to find one that achieves at least 80
;; columns.
(setq window-size-change-functions
'((lambda (frame)
(let ((trial-size maximum-font-height)
(previous-size (gethash frame current-frame-widths -1)))
(when (/= previous-size (frame-width frame))
(puthash frame (frame-width frame) current-frame-widths)
(set-face-attribute 'default frame :height trial-size)
(while (and (> trial-size minimum-font-height)
(< (frame-width frame) 80))
(setq trial-size (- trial-size 10))
(set-face-attribute 'default frame :height trial-size))
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