Update example of Lua filter for color span
cderv opened this issue · 1 comments
cderv commented
For the next guy who comes here via google, here is a version of the lua script adapted to support hex-style RGB colors, and yes it also works with vanilla Pandoc:
--- copied from https://github.com/rstudio/rmarkdown-cookbook/issues/194#issuecomment-610614496
--- adapted to support hex-style RGB colors by pbsds
Span = function(span)
color = span.attributes['color']
-- if no color attribute, return unchange
if color == nil then return span end
-- tranform to <span style="color: red;"></span>
if FORMAT:match 'html' then
-- remove color attributes
span.attributes['color'] = nil
-- use style attribute instead
span.attributes['style'] = 'color: ' .. color .. ';'
-- return full span element
return span
elseif FORMAT:match 'latex' then
-- remove color attributes
span.attributes['color'] = nil
-- encapsulate in latex code
if string.sub(color, 1, 1) == "#" and #color == 7 then
-- TODO: requires xcolor
local R = tostring(tonumber(string.sub(color, 2, 3), 16))
local G = tostring(tonumber(string.sub(color, 4, 5), 16))
local B = tostring(tonumber(string.sub(color, 6, 7), 16))
table.insert(
span.content, 1,
pandoc.RawInline('latex', '\\textcolor[RGB]{'..R..','..G..','..B..'}{')
)
elseif string.sub(color, 1, 1) == "#" and #color == 4 then
-- TODO: requires xcolor
local R = tostring(tonumber(string.sub(color, 2, 2), 16) * 0x11)
local G = tostring(tonumber(string.sub(color, 3, 3), 16) * 0x11)
local B = tostring(tonumber(string.sub(color, 4, 4), 16) * 0x11)
table.insert(
span.content, 1,
pandoc.RawInline('latex', '\\textcolor[RGB]{'..R..','..G..','..B..'}{')
)
else
table.insert(
span.content, 1,
pandoc.RawInline('latex', '\\textcolor{'..color..'}{')
)
end
table.insert(
span.content,
pandoc.RawInline('latex', '}')
)
-- returns only span content
return span.content
else
-- for other format return unchanged
return span
end
end
Originally posted by @pbsds in #194 (comment)
CLRafaelR commented
In related to #323, I would like to suggest the following modification so that we can use @pbsds's implementation of hex-RGB specification for revealjs and beamer, too.
Span = function(span)
color = span.attributes['color']
-- if no color attribute, return unchange
if color == nil then return span end
-- tranform to <span style="color: red;"></span>
if FORMAT:match 'html' or FORMAT:match 'revealjs' then -- Also available for revealjs
-- remove color attributes
span.attributes['color'] = nil
-- use style attribute instead
span.attributes['style'] = 'color: ' .. color .. ';'
-- return full span element
return span
elseif FORMAT:match 'latex' or FORMAT:match 'beamer' then -- Also available for beamer
-- remove color attributes
span.attributes['color'] = nil
-- encapsulate in latex code
if string.sub(color, 1, 1) == "#" and #color == 7 then
-- TODO: requires xcolor
local R = tostring(tonumber(string.sub(color, 2, 3), 16))
local G = tostring(tonumber(string.sub(color, 4, 5), 16))
local B = tostring(tonumber(string.sub(color, 6, 7), 16))
table.insert(
span.content, 1,
pandoc.RawInline('latex', '\\textcolor[RGB]{'..R..','..G..','..B..'}{')
)
elseif string.sub(color, 1, 1) == "#" and #color == 4 then
-- TODO: requires xcolor
local R = tostring(tonumber(string.sub(color, 2, 2), 16) * 0x11)
local G = tostring(tonumber(string.sub(color, 3, 3), 16) * 0x11)
local B = tostring(tonumber(string.sub(color, 4, 4), 16) * 0x11)
table.insert(
span.content, 1,
pandoc.RawInline('latex', '\\textcolor[RGB]{'..R..','..G..','..B..'}{')
)
else
table.insert(
span.content, 1,
pandoc.RawInline('latex', '\\textcolor{'..color..'}{')
)
end
table.insert(
span.content,
pandoc.RawInline('latex', '}')
)
-- returns only span content
return span.content
else
-- for other format return unchanged
return span
end
end