prosody
c48ae06e24d6
util/human/units.lua

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util/human/units.lua @ 13182:c48ae06e24d6

util.datamanager: Fix indexing first item if not at the very start If the first item does not start at position 0 then the index function produces a phantom first entry covering position zero until where the real first item starts. When using the index, this would make it either appear as the first item was missing or cause an off-by-one issue with remaining items.
author Kim Alvefur <zash@zash.se>
date Mon, 10 Jul 2023 17:19:05 +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 };