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copied!<p>Here's the function I use.</p> <pre><code>(defconst number-to-string-approx-suffixes '("k" "M" "G" "T" "P" "E" "Z" "Y")) (defun number-to-string-approx-suffix (n &optional binary) "Return an approximate decimal representation of NUMBER as a string, followed by a multiplier suffix (k, M, G, T, P, E, Z, Y). The representation is at most 5 characters long for numbers between 0 and 10^19-5*10^16. Uses a minus sign if negative. NUMBER may be an integer or a floating point number. If the optional argument BINARY is non-nil, use 1024 instead of 1000 as the base multiplier." (if (zerop n) "0" (let ((sign "") (b (if binary 1024 1000)) (suffix "") (bigger-suffixes number-to-string-approx-suffixes)) (if (< n 0) (setq n (- n) sign "-")) (while (and (>= n 9999.5) (consp bigger-suffixes)) (setq n (/ n b) ; TODO: this is rounding down; nearest would be better suffix (car bigger-suffixes) bigger-suffixes (cdr bigger-suffixes))) (concat sign (if (integerp n) (int-to-string n) (number-to-string (floor n))) suffix)))) </code></pre> <p>I use it in the size column of the buffer menu.</p> <pre><code>(defvar Buffer-menu-buffer+size-shorten 'binary) (defadvice Buffer-menu-buffer+size (before Buffer-menu-shorten-size compile activate) "Shorten the size column in a buffer menu by using multiplier suffixes \(k, M, G, T\). This is done only if `Buffer-menu-buffer+size-shorten' is non-nil. If `Buffer-menu-buffer+size-shorten' is the symbol `binary', use binary multipliers (powers of 1024). Otherwise use decimal (powers of 1000) multipliers." (if Buffer-menu-buffer+size-shorten (let ((binary (eq Buffer-menu-buffer+size-shorten 'binary))) (save-match-data (if (string-match "^[0-9]+$" size) (setq size (number-to-string-approx-suffix (string-to-number size) binary))))))) </code></pre>

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