prosody
0c077800cd70
tools/migration/migrator/mtools.lua

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tools/migration/migrator/mtools.lua @ 8681:0c077800cd70

util.async: Make parameters to async.runner() optional
author Matthew Wild <mwild1@gmail.com>
date Fri, 23 Mar 2018 14:02:33 +0000
parent 7881:4e3067272fae
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2
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3 local print = print;
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4 local t_insert = table.insert;
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5 local t_sort = table.sort;
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8 local function sorted(params)
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9
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10 local reader = params.reader; -- iterator to get items from
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11 local sorter = params.sorter; -- sorting function
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12 local filter = params.filter; -- filter function
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13
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14 local cache = {};
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15 for item in reader do
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16 if filter then item = filter(item); end
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17 if item then t_insert(cache, item); end
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18 end
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19 if sorter then
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20 t_sort(cache, sorter);
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21 end
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22 local i = 0;
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23 return function()
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24 i = i + 1;
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25 return cache[i];
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26 end;
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28 end
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29
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30 local function merged(reader, merger)
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31
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32 local item1 = reader();
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33 local merged = { item1 };
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34 return function()
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35 while true do
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36 if not item1 then return nil; end
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37 local item2 = reader();
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38 if not item2 then item1 = nil; return merged; end
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39 if merger(item1, item2) then
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40 --print("merged")
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41 item1 = item2;
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42 t_insert(merged, item1);
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43 else
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44 --print("unmerged", merged)
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45 item1 = item2;
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46 local tmp = merged;
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47 merged = { item1 };
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48 return tmp;
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49 end
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50 end
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51 end;
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52
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53 end
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55 return {
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56 sorted = sorted;
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57 merged = merged;
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58 }