fix .gitignore, Makefile and README.md for 2014/endoh

Unpack src.zip.

2014/endoh1/tool.rb

@@ -0,0 +1,49 @@
+require "zlib"
+
+lines = [*$<]
+
+if lines.join.gsub(/\e\[\d*m/, "").chars.uniq.sort == ["\n", " "]
+
+  matrix = lines.map do |line|
+    row = []
+    cell = nil
+    line.chomp.scan(/\G(?:\e\[(\d+)m|..)/) do
+      if $1
+        cell = $1 == "40" ? :black : :white
+      else
+        row << cell
+      end
+    end
+    row
+  end
+
+  size = matrix.size
+  if size != matrix.first.size
+    raise "not square: #{ matrix.first.size } x #{ matrix.size }"
+  end
+  $stderr.puts "Version: #{ (size - 25) / 4 }"
+
+  scale = 400 / size
+  data = (0 ... scale * size).flat_map do |y|
+    [0] + (0 ... scale * size).flat_map do |x|
+      matrix[y / scale][x / scale] == :black ? [0, 0, 0] : [255, 255, 255]
+    end
+  end
+
+  print "\x89PNG\r\n\x1a\n"
+  [
+    ["IHDR", [scale * size, scale * size, 8, 2, 0, 0, 0].pack("NNCCCCC")],
+    ["IDAT", Zlib::Deflate.deflate(data.pack("C*"))],
+    ["IEND", ""],
+  ].each do |type, data|
+    print [data.bytesize, type, data, Zlib.crc32(type + data)].pack("NA4A*N")
+  end
+
+else
+
+  width = lines.map {|line| line.chomp.size + 4 * 4 }.max
+  lines.each do |line|
+    puts line.chomp.ljust(width).gsub(/../) { "\e[#{ $& == "  " ? 47 : 40 }m  " }
+  end
+
+end