prosody
84c7779618b6
util/human/units.lua

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util/human/units.lua @ 13252:84c7779618b6

core.portmanager: Join strings broken into multiple lines Improves readability. Reduces line count. What's not to like? The code style and luacheck rules allows longer lines, and these strings aren't long enough to need breaking into multiple lines like this.
author Kim Alvefur <zash@zash.se>
date Sat, 29 Jul 2023 02:04:24 +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 };