45 lines
918 B
Lua
45 lines
918 B
Lua
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local function new(file)
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local set = {}
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local fh = fs.open(file, "r")
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if fh == nil then
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-- no such file, return empty set
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return {inner=set, file=file}
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end
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local line = fh.readLine()
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while line ~= nil do
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if line then
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set[line] = true
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end
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line = fh.readLine()
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end
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fh.close()
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return {inner=set, file=file}
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end
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local function writeSet(set)
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local fh = fs.open(set.file, "w")
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for it, allowed in pairs(set.inner) do
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if allowed then
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fh.writeLine(it)
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end
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end
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fh.flush()
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fh.close()
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end
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local function add(set, item)
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set.inner[item] = true
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writeSet(set)
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end
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local function remove(set, item)
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set.inner[item] = false
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writeSet(set)
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end
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local function has(set, item)
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return set.inner[item] == true
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end
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return {new=new, writeSet=writeSet, add=add, remove=remove, has=has}
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