prosody
0d1cd3185299
util/human/units.lua

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util/human/units.lua @ 13176:0d1cd3185299

mod_http_file_share: Put 'expires' back, thought it was unused Removed in 536055476912 because it was not used anywhere else in the file, but per the documentation it is meant to inform external upload services of the expiry time of the upload itself.
author Kim Alvefur <zash@zash.se>
date Sun, 02 Jul 2023 14:31:00 +0200
parent 12589:39ae08180c81
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local math_abs = math.abs;
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2 local math_ceil = math.ceil;
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3 local math_floor = math.floor;
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4 local math_log = math.log;
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5 local math_max = math.max;
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6 local math_min = math.min;
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7 local unpack = table.unpack;
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8
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9 local large = {
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10 "k", 1000,
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11 "M", 1000000,
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12 "G", 1000000000,
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13 "T", 1000000000000,
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14 "P", 1000000000000000,
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15 "E", 1000000000000000000,
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16 "Z", 1000000000000000000000,
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17 "Y", 1000000000000000000000000,
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18 }
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19 local small = {
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20 "m", 0.001,
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21 "μ", 0.000001,
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22 "n", 0.000000001,
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23 "p", 0.000000000001,
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24 "f", 0.000000000000001,
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25 "a", 0.000000000000000001,
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26 "z", 0.000000000000000000001,
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27 "y", 0.000000000000000000000001,
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28 }
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29
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30 local binary = {
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31 "Ki", 2^10,
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32 "Mi", 2^20,
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33 "Gi", 2^30,
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34 "Ti", 2^40,
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35 "Pi", 2^50,
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36 "Ei", 2^60,
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37 "Zi", 2^70,
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38 "Yi", 2^80,
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39 }
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40
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41 local function adjusted_unit(n, b)
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42 local round = math_floor;
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43 local prefixes = large;
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44 local logbase = 1000;
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45 if b == 'b' then
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46 prefixes = binary;
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47 logbase = 1024;
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48 elseif n < 1 then
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49 prefixes = small;
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50 round = math_ceil;
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51 end
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52 local m = math_max(0, math_min(8, round(math_abs(math_log(math_abs(n), logbase)))));
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53 local prefix, multiplier = unpack(prefixes, m * 2-1, m*2);
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54 return multiplier or 1, prefix;
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55 end
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56
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57 -- n: number, the number to format
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58 -- unit: string, the base unit
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59 -- b: optional enum 'b', thousands base
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60 local function format(n, unit, b) --> string
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61 local fmt = "%.3g %s%s";
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62 if n == 0 then
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63 return fmt:format(n, "", unit);
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64 end
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65 local multiplier, prefix = adjusted_unit(n, b);
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66 return fmt:format(n / multiplier, prefix or "", unit);
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67 end
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68
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69 return {
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70 adjust = adjusted_unit;
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71 format = format;
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72 };