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#!/usr/bin/lua
local filename = ...
local name = filename:match("([^\\/]+)%..*$") .. "_preview"
-- get colors
local text = io.open(filename):read("*a")
local colors = {}
for r, g, b in text:gmatch("#(%x%x)(%x%x)(%x%x)") do
r = tonumber(r, 16)
g = tonumber(g, 16)
b = tonumber(b, 16)
table.insert(colors, { r, g, b })
end
table.sort(colors, function(a, b)
return a[1] + a[2] + a[3] < b[1] + b[2] + b[3]
end)
local function eq(a, b)
return a[1] == b[1] and a[2] == b[2] and a[3] == b[3]
end
local prev = {}
for i = #colors, 1, -1 do
if eq(colors[i], prev) then
table.remove(colors, i)
else
prev = colors[i]
end
end
--generate svg file
local w = 200
local h = 16
local fp = io.open(name .. ".svg", "wb")
fp:write('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="'..w..'" height="'..h..'" shape-rendering="crispEdges"> \n')
for i = 1, #colors do
local width = w/#colors
local r, g, b = table.unpack(colors[i])
local rect = '<rect x="'..(i-1)*width..'" width="'..width..'" height="'..h..'" fill="rgb('..r..', '..g..', '..b..')"></rect> \n'
fp:write(rect)
end
fp:write('</svg>')
fp:close()
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