Inspired by this question, I try to use a different font for all emoji characters in the document. In the code sample below, I build the is_emoji function according to unicode standards.
\documentclass{article}
\usepackage{fontspec}
\usepackage{luacode}
\setmainfont{texgyretermes-regular}[
Extension = .otf ,
BoldFont = texgyretermes-bold,
ItalicFont = texgyretermes-italic,
BoldItalicFont = texgyretermes-bolditalic,
]
% need to download NotoColorEmoji
% https://github.com/googlefonts/noto-emoji/blob/master/fonts/NotoColorEmoji.ttf
\newfontface{\notocoloremoji}{NotoColorEmoji}[
Extension = .ttf,
Renderer = Harfbuzz
]
{
\notocoloremoji\global\expandafter\let\expandafter\luafontsymbola\the\font
}
\begin{luacode*}
-- code range for emojis
local emoji_range = {{8596, 8600}, {8617, 8617}, {8986, 8986},
{9193, 9195}, {9197, 9197}, {9201, 9201}, {9208, 9209},
{9642, 9642}, {9723, 9725}, {9728, 9728}, {9730, 9730},
{9735, 9740}, {9743, 9743}, {9748, 9748}, {9750, 9750},
{9753, 9755}, {9758, 9758}, {9762, 9762}, {9764, 9764},
{9767, 9768}, {9771, 9772}, {9776, 9782}, {9784, 9784},
{9787, 9790}, {9795, 9798}, {9800, 9810}, {9812, 9821},
{9825, 9825}, {9829, 9829}, {9833, 9849}, {9852, 9852},
{9856, 9860}, {9872, 9872}, {9878, 9878}, {9883, 9883},
{9885, 9886}, {9888, 9888}, {9890, 9893}, {9896, 9896},
{9898, 9898}, {9900, 9902}, {9904, 9904}, {9906, 9915},
{9917, 9917}, {9919, 9922}, {9924, 9924}, {9926, 9926},
{9929, 9932}, {9941, 9959}, {9963, 9966}, {9968, 9968},
{9970, 9970}, {9975, 9976}, {9979, 9979}, {9982, 9984},
{9987, 9987}, {9992, 9995}, {10000, 10000}, {10035, 10035},
{10067, 10068}, {10085, 10086}, {10133, 10134}, {10548, 10548},
{11013, 11014}, {11035, 11035}, {126976, 126978}, {126981, 127181},
{127184, 127230}, {127245, 127246}, {127340, 127342},
{127344, 127344}, {127358, 127358}, {127377, 127385},
{127405, 127460}, {127462, 127486}, {127489, 127489},
{127491, 127502}, {127538, 127545}, {127548, 127550},
{127561, 127566}, {127568, 127568}, {127570, 127742},
{127744, 127755}, {127757, 127757}, {127763, 127764},
{127766, 127767}, {127773, 127773}, {127775, 127775},
{127778, 127778}, {127780, 127787}, {127789, 127790},
{127792, 127792}, {127794, 127794}, {127796, 127796},
{127799, 127817}, {127820, 127822}, {127825, 127866},
{127870, 127870}, {127872, 127890}, {127892, 127892},
{127894, 127894}, {127897, 127898}, {127900, 127900},
{127902, 127902}, {127904, 127939}, {127947, 127949},
{127951, 127954}, {127956, 127966}, {127968, 127970},
{127973, 127983}, {127985, 127985}, {127992, 128006},
{128009, 128010}, {128012, 128013}, {128015, 128015},
{128017, 128017}, {128023, 128040}, {128043, 128061},
{128066, 128099}, {128102, 128106}, {128108, 128108},
{128110, 128171}, {128174, 128180}, {128182, 128182},
{128184, 128234}, {128236, 128236}, {128240, 128243},
{128246, 128246}, {128249, 128251}, {128255, 128257},
{128260, 128262}, {128266, 128275}, {128278, 128298},
{128300, 128300}, {128302, 128316}, {128326, 128327},
{128329, 128329}, {128331, 128333}, {128336, 128346},
{128348, 128358}, {128360, 128365}, {128367, 128367},
{128369, 128369}, {128371, 128376}, {128379, 128389},
{128392, 128392}, {128394, 128396}, {128398, 128398},
{128401, 128403}, {128405, 128405}, {128407, 128418},
{128422, 128422}, {128425, 128431}, {128433, 128433},
{128435, 128442}, {128445, 128448}, {128450, 128451},
{128453, 128463}, {128465, 128466}, {128468, 128474},
{128476, 128477}, {128479, 128479}, {128484, 128486},
{128489, 128493}, {128496, 128497}, {128500, 128504},
{128507, 128510}, {128513, 128517}, {128519, 128519},
{128521, 128524}, {128530, 128531}, {128540, 128541},
{128544, 128548}, {128550, 128550}, {128552, 128554},
{128558, 128558}, {128560, 128562}, {128567, 128575},
{128577, 128579}, {128581, 128590}, {128641, 128641},
{128643, 128644}, {128650, 128650}, {128657, 128658},
{128665, 128665}, {128667, 128672}, {128676, 128676},
{128679, 128684}, {128686, 128688}, {128691, 128692},
{128695, 128695}, {128697, 128701}, {128705, 128708},
{128710, 128713}, {128717, 128718}, {128721, 128721},
{128723, 128723}, {128726, 128726}, {128728, 128734},
{128736, 128740}, {128742, 128743}, {128747, 128747},
{128749, 128750}, {128753, 128753}, {128756, 128757},
{128759, 128759}, {128763, 128763}, {128765, 128766},
{128884, 128894}, {128981, 128990}, {128992, 129002},
{129004, 129022}, {129036, 129038}, {129096, 129102},
{129114, 129118}, {129160, 129166}, {129198, 129278},
{129293, 129294}, {129296, 129303}, {129305, 129309},
{129312, 129318}, {129320, 129326}, {129329, 129329},
{129331, 129337}, {129340, 129341}, {129344, 129348},
{129351, 129354}, {129357, 129358}, {129360, 129373},
{129375, 129386}, {129388, 129391}, {129395, 129397},
{129399, 129399}, {129404, 129406}, {129408, 129411},
{129413, 129424}, {129426, 129430}, {129432, 129441},
{129443, 129443}, {129445, 129449}, {129451, 129452},
{129454, 129454}, {129456, 129464}, {129466, 129470},
{129473, 129473}, {129475, 129481}, {129485, 129486},
{129488, 129509}, {129511, 129534}, {129536, 129646},
{129648, 129650}, {129653, 129654}, {129656, 129657},
{129659, 129662}, {129664, 129665}, {129667, 129669},
{129671, 129678}, {129680, 129684}, {129686, 129703},
{129705, 129710}, {129712, 129717}, {129719, 129726},
{129728, 129729}, {129731, 129742}, {129744, 129749},
{129751, 129790}, {130048, 131068}}
function is_emoji(id)
if id < emoji_range[1][1]then
return false
end
-- naive search
for _, p in pairs(emoji_range) do
if id >= p[1] and id <= p[2] then
return true
end
end
return false
end
local font_id = font.id("luafontsymbola")
function replace_font(hd)
for n in node.traverse_id(node.id("glyph"), hd) do
if is_emoji(n.char) then
n.font = font_id
end
end
return hd
end
luatexbase.add_to_callback("pre_linebreak_filter", replace_font, "replace_font")
\end{luacode*}
\begin{document}
minikube v1.15.1 on Ubuntu 20.04\
✨ Automatically selected the docker driver\
Starting control plane node minikube in cluster minikube\
Pulling base image ...
\end{document}
My plan is to change the font of a glyph node to NotoColorEmoji if is_emoji is True. However, I get the following error:
! error: (file [NotoColorEmoji.ttf]:mode=harf;script=DFLT;language=dflt;) (type
3): font [NotoColorEmoji.ttf]:mode=harf;script=DFLT;language=dflt; at 600 not f
ound
- This seems to a problem only with
NotoColorEmoji.ttf, because substituting with other fonts does not raise the same problem. - I noticed that
luaotfloadprovidesfallbackoptions, which might work in this case. However, it involves many low-level APIs. Is it possible forfontspecto make use offallback?
