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--[[
Sample plugin file for highlight
Adds background stripes
]]
Description="Adds background stripes in HTML output "
Categories = {"format", "html" }
-- function to update theme definition
-- optional parameter: theme description
function themeUpdate()
function lighten(colour)
if string.match(colour, "#%x+")==nil then
return "rgba(0,0,0,0)"
end
base_rr = ("0x"..string.match(colour, "%x%x", 2))
base_gg = ("0x"..string.match(colour, "%x%x", 4))
base_bb = ("0x"..string.match(colour, "%x%x", 6))
min_bright=math.min(base_rr, base_gg, base_bb)
max_bright=math.max(base_rr, base_gg, base_bb)
brightness = (min_bright + max_bright) / (255*2.0)
if (brightness < 0.1) then
return "rgba(50,50,50, 0.5)"
elseif (brightness < 0.5) then
percent = 100
elseif (brightness > 0.95) then
percent = -10
else
percent = 80
end
rr = math.floor(base_rr * (100 + percent) / 100 )
gg = math.floor(base_gg * (100 + percent) / 100 )
bb = math.floor(base_bb * (100 + percent) / 100 )
if (rr>255) then rr = 255 end
if (gg>255) then gg = 255 end
if (bb>255) then bb = 255 end
return string.format("rgba(%d,%d,%d,0.25)", rr, gg, bb)
end
if (HL_OUTPUT == HL_FORMAT_HTML or HL_OUTPUT == HL_FORMAT_XHTML) then
-- inspired by prismjs ;)
Injections[#Injections+1]="pre.hl { background-image: linear-gradient(transparent 50%, "..lighten(Canvas.Colour)..
" 50%); background-size:3em 3em; background-origin:content-box; font-size:100%/1.5;line-height: 1.5; }"
end
end
--The Plugins array assigns code chunks to themes or language definitions.
--The chunks are interpreted after the theme or lang file were parsed,
--so you can refer to elements of these files
Plugins={
{ Type="theme", Chunk=themeUpdate }
}
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