fontsluatexsymbolsunicode
This closed question prompts me to propose a more general question and a solution I don't think has been demonstrated here.
When compiling with LuaLaTeX and using Unicode input, how do you set up a fallback font for specific Unicode characters that are absent from the main font?
I would welcome other approaches or critiques of the one I demonstrate.
can be done with luatex. \OD is the font face of the ornament font (needed on TeX level)
\documentclass[a5paper]{article}
\usepackage{luacode}
\usepackage[margin=0.5cm]{geometry}
\usepackage{fontspec}
\usepackage{multicol}
\setlength{\columnsep}{0.3cm} \setlength{\columnseprule}{1pt}
\setmainfont{Linux Libertine O}
\newfontface\OD{OrnamentalDecoration.otf}
\begin{document}
\begin{multicols}{4}\noindent
\begin{luacode*}
local f = fontloader.open('OrnamentalDecoration.otf')
local glyphs = {}
for i = 0, f.glyphmax - 1 do
local g = f.glyphs[i]
if g then
table.insert(glyphs, {name = g.name, unicode = g.unicode})
end
end
table.sort(glyphs, function (a,b) return (a.unicode < b.unicode) end)
for i = 1, #glyphs do
tex.sprint(glyphs[i].unicode .. ": ")
if (glyphs[i].unicode > 0) then
tex.sprint("{\\OD\\char" .. glyphs[i].unicode .. "}");
end
tex.print(" {\\small(")
tex.print(-2, glyphs[i].name )
tex.sprint(')}\\\\')
end
fontloader.close(f)
\end{luacode*}
\end{multicols}
\end{document}
You are getting the errors because pandoc treats the header as Markdown. You need to tell it to treat your header as a LaTeX code block.
However even after doing this, it still fails because the template puts the font selection before it inserts the header material. So you need to put the font selection in your header for things to happen in the right order.
You can use:
pandoc -s test.md -o test.tex
to see the intermediate tex file and diagnose what is going wrong.
Putting it all together, this will work:
---
header-includes:
- |
```{=latex}
\directlua{luaotfload.add_fallback(
"myfallback",
{"NotoColorEmoji:mode=harf;"}
)}
\setmainfont[RawFeature={fallback=myfallback}]{LatinModernRoman}
\setmonofont[RawFeature={fallback=myfallback}]{LatinModernMono}
```
---
It 😺 lorem 👅 \LaTeX.
```julia
🟡 = 2
```
And then run:
pandoc --pdf-engine=lualatex test.md -o test.pdf
which gives:
Best Answer
We can define a command to switch to a fallback font using
fontspec.Then we can use
newunicodecharto map the missing Unicode characters to a command that switched to the fallback font for those characters.Output of
pdffontsshowing that both fonts are used:EDIT:
We could also define a general command for setting up missing characters. It takes an optional argument which defaults to
\textfallback, but a different font could be inserted in case an additional fallback font was needed.