feat(wpcarro/emacs): Package bytes.el

Another meh package, but let's finish the job and package it up.

Change-Id: I7852a776c93c8c6717878a5ee0742287d2d23052
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7394
Reviewed-by: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/emacs/pkgs/bytes/bytes.el

@@ -0,0 +1,94 @@
+;;; bytes.el --- Working with byte values -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Functions to help with human-readable representations of byte values.
+;;
+;; Usage:
+;; See the test cases for example usage.  Or better yet, I should use a type of
+;; structured documentation that would allow me to expose a view into the test
+;; suite here.  Is this currently possible in Elisp?
+;;
+;; API:
+;; - serialize :: Integer -> String
+;;
+;; Wish list:
+;; - Rounding: e.g. (bytes (* 1024 1.7)) => "2KB"
+
+;;; Code:
+
+;; TODO: Support -ibabyte variants like Gibibyte (GiB).
+
+;; Ranges:
+;;  B: [   0,  1e3)
+;; KB: [ 1e3,  1e6)
+;; MB: [ 1e6,  1e6)
+;; GB: [ 1e9, 1e12)
+;; TB: [1e12, 1e15)
+;; PB: [1e15, 1e18)
+;;
+;; Note: I'm currently not support exabytes because that causes the integer to
+;;  overflow.  I imagine a larger integer type may exist, but for now, I'll
+;;  treat this as a YAGNI.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'tuple)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst bytes-kb (expt 2 10)
+  "Number of bytes in a kilobyte.")
+
+(defconst bytes-mb (expt 2 20)
+  "Number of bytes in a megabytes.")
+
+(defconst bytes-gb (expt 2 30)
+  "Number of bytes in a gigabyte.")
+
+(defconst bytes-tb (expt 2 40)
+  "Number of bytes in a terabyte.")
+
+(defconst bytes-pb (expt 2 50)
+  "Number of bytes in a petabyte.")
+
+(defconst bytes-eb (expt 2 60)
+  "Number of bytes in an exabyte.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun bytes-classify (x)
+  "Return unit that closest fits byte count, X."
+  (cond
+   ((and (>= x 0)        (< x bytes-kb))     'byte)
+   ((and (>= x bytes-kb) (< x bytes-mb)) 'kilobyte)
+   ((and (>= x bytes-mb) (< x bytes-gb)) 'megabyte)
+   ((and (>= x bytes-gb) (< x bytes-tb)) 'gigabyte)
+   ((and (>= x bytes-tb) (< x bytes-pb)) 'terabyte)
+   ((and (>= x bytes-pb) (< x bytes-eb)) 'petabyte)))
+
+(defun bytes-to-string (x)
+  "Convert integer X into a human-readable string."
+  (let ((base-and-unit
+         (pcase (bytes-classify x)
+           ('byte     (tuple-from        1 "B"))
+           ('kilobyte (tuple-from bytes-kb "KB"))
+           ('megabyte (tuple-from bytes-mb "MB"))
+           ('gigabyte (tuple-from bytes-gb "GB"))
+           ('terabyte (tuple-from bytes-tb "TB"))
+           ('petabyte (tuple-from bytes-pb "PB")))))
+    (format "%d%s"
+            (round x (tuple-first base-and-unit))
+            (tuple-second base-and-unit))))
+
+(provide 'bytes)
+;;; bytes.el ends here

users/wpcarro/emacs/pkgs/bytes/default.nix

@@ -0,0 +1,25 @@
+{ pkgs, depot, ... }:
+
+let
+  bytes = pkgs.callPackage
+    ({ emacsPackages }:
+      emacsPackages.trivialBuild {
+        pname = "bytes";
+        version = "1.0.0";
+        src = ./bytes.el;
+        packageRequires =
+          (with depot.users.wpcarro.emacs.pkgs; [
+            tuple
+          ]);
+      })
+    { };
+
+  emacs = (pkgs.emacsPackagesFor pkgs.emacs28).emacsWithPackages (epkgs: [ bytes ]);
+in
+bytes.overrideAttrs (_old: {
+  doCheck = true;
+  checkPhase = ''
+    ${emacs}/bin/emacs -batch \
+      -l ert -l ${./tests.el} -f ert-run-tests-batch-and-exit
+  '';
+})

users/wpcarro/emacs/pkgs/bytes/tests.el

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+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ert)
+(require 'bytes)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(ert-deftest bytes-to-string ()
+  (should (equal "1000B" (bytes-to-string 1000)))
+  (should (equal "2KB" (bytes-to-string (* 2 bytes-kb))))
+  (should (equal "17MB" (bytes-to-string (* 17 bytes-mb))))
+  (should (equal "419GB" (bytes-to-string (* 419 bytes-gb))))
+  (should (equal "999TB" (bytes-to-string (* 999 bytes-tb))))
+  (should (equal "2PB" (bytes-to-string (* 2 bytes-pb)))))