prosody
49bbdc22846d
util/human/units.lua

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util/human/units.lua @ 13752:49bbdc22846d 13.0

certmanager: Add more debug logging around cert indexing Currently it's not obvious which directories have been indexed (especially when the resulting index is empty), or why certain files have been skipped.
author Matthew Wild <mwild1@gmail.com>
date Mon, 24 Feb 2025 17:48:58 +0000
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 };