74 lines
1.4 KiB
Text
74 lines
1.4 KiB
Text
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#!/usr/bin/env lua
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-- Ajdacent characters numbering:
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-- 1
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-- 2 + 3
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-- 4
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-- '+' = it's another plus
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-- '.' = it's something else
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local adjacency_char_map = {
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["...."] = "┼";
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["...+"] = "│";
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["..+."] = "─";
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["..++"] = "┌";
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[".+.."] = "─";
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[".+.+"] = "┐";
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[".++."] = "─";
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[".+++"] = "┬";
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["+..."] = "│";
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["+..+"] = "│";
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["+.+."] = "└";
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["+.++"] = "├";
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["++.."] = "┘";
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["++.+"] = "┤";
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["+++."] = "┴";
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["++++"] = "┼";
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}
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local input do
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input = setmetatable({}, {__index = function(self, key)
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if type(key) == "number" then
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return {}
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end
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end})
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for line in io.stdin:lines() do
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local buf = {}
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for char in line:gmatch(".") do
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table.insert(buf, char)
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end
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table.insert(input, buf)
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end
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end
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local function rawipairs(tab)
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return function(tab, i)
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i = i + 1
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if rawget(tab, i) then
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return i, rawget(tab, i)
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end
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end, tab, 0
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end
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local output = {}
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for lnum, line in rawipairs(input) do
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output[lnum] = {}
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for cnum, char in rawipairs(line) do
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if char == "+" then
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local adjacency =
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(input[lnum-1][cnum] == "+" and "+" or ".")
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..(line[cnum-1] == "+" and "+" or ".")
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..(line[cnum+1] == "+" and "+" or ".")
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..(input[lnum+1][cnum] == "+" and "+" or ".")
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output[lnum][cnum] = adjacency_char_map[adjacency]
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else
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output[lnum][cnum] = char
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end
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end
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end
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for _, line in ipairs(output) do
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print(table.concat(line))
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end
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