18

I would like to use the Fira Code OTF font for code listings and verbatim blocks, which has beautiful ligatures. The font loads correctly using the following line:

\setmonofont{FiraCode-Regular}

But I cannot get the ligatures to work, no matter how many combinations of [Ligatures={X}] or [RawFeatures={X}] I try.

Is there any way to make them work with xelatex?

  • 1
    What is a ligature in a code listing? – A Feldman Feb 17 '16 at 3:38
  • 2
    @AFeldman You should have a look at the Fira Code font that he links to. It contains the examples of the ligature that this font introduces. – JP-Ellis Feb 17 '16 at 3:44
  • Welcome! Can you post a complete minimal example people can compile? Does LuaLaTeX work any better? – cfr Feb 17 '16 at 3:54
  • @JP-Ellis thanks, kind of freaky looking, but that's from a non-programmer's perspective. – A Feldman Feb 17 '16 at 3:54
21
+50

Firstly, you'll need to make sure that Fira Code is installed on your computer (which I'm sure you already do).

The font features that Fira Code uses aren't actually listed as ligatures within the OTF, but seems to be fall under Contextuals. In order to use these font features, it is just a matter of enabling the appropriate contextuals:

\documentclass{article}

\usepackage{fontspec}
\setmonofont[
  Contextuals={Alternate}
]{Fira Code}

\begin{document}
\begin{verbatim}
           .= .- := =:=
        == != === !== =/=

    <<- <-- <- <-> -> --> ->>
<=< <<= <==    <=> => ==> =>> >=>
    >>= >>- >-     -< -<< =<<
        <~~ <~ ~~~ ~> ~~>

     <<< << <= <>  >= >> >>>
            <| <|> |>

            <$ <$> $>
            <+ <+> +>
            <* <*> *>

       \\ \\\ {- -} // ///
          /* /** **/ */ 
      </ <!-- www  --> />
      0xF  9:45  m-x *ptr

       ;; ;;; :: ::: !! !!!
       ?? ??? %% %%% && &&& 
       || ||| .. ... ..< []
       -- --- ++ +++ ** ***

          ~= ~- -~ =~ ~@
        ^= ?= /= /== |= ||=
           ## ### ####
         #{ #[ #( #? #_ #_(


a*b a*A B*b A*B *a *A a* A*
a-b a-A B-b A-B -a -A a- A-
a+b a+A B+b A+B +a +A a+ A+
a:b a:A B:b A:B :a :A a: A:
\end{verbatim}
\end{document}

output

Note that I'm still trying to figure out why certain substitutions work (such as .=) but some others don't (such as .-). I suspect it may be do - being converted from the ASCII dash to some other dash.

Just for reference, the ligatures from Fira Code are:

reference

The “missing” ligatures can be obtained by removing the characters verbatim wants to treat in a special way because traditional TeX fonts have ligatures; by default, fontspec doesn't apply Ligatures=TeX to the monospaced font, so there's no risk in redefining \verbatim@noligs@list to empty.

\documentclass{article}

\usepackage{fontspec}

\setmonofont[
  Contextuals={Alternate}
]{Fira Code}

\makeatletter
\def\verbatim@nolig@list{}
\makeatother


\begin{document}

\begin{verbatim}
           .= .- := =:=
        == != === !== =/=

    <<- <-- <- <-> -> --> ->>
<=< <<= <==    <=> => ==> =>> >=>
    >>= >>- >-     -< -<< =<<
        <~~ <~ ~~~ ~> ~~>

     <<< << <= <>  >= >> >>>
            <| <|> |>

            <$ <$> $>
            <+ <+> +>
            <* <*> *>

       \\ \\\ {- -} // ///
          /* /** **/ */ 
      </ <!-- www  --> />
      0xF  9:45  m-x *ptr

       ;; ;;; :: ::: !! !!!
       ?? ??? %% %%% && &&& 
       || ||| .. ... ..< []
       -- --- ++ +++ ** ***

          ~= ~- -~ =~ ~@
        ^= ?= /= /== |= ||=
           ## ### ####
         #{ #[ #( #? #_ #_(


a*b a*A B*b A*B *a *A a* A*
a-b a-A B-b A-B -a -A a- A-
a+b a+A B+b A+B +a +A a+ A+
a:b a:A B:b A:B :a :A a: A:
\end{verbatim}
\end{document}

enter image description here

| improve this answer | |
  • Worked great. Thanks! Out of curiosity, what tool did you use to analyze the OTF file? – Federico B. Feb 17 '16 at 7:25
  • I used fontforge to analyse the OTF file, that's how I figured that Fira Code implements these replacement. – JP-Ellis Feb 17 '16 at 9:01
  • 2
    The ligatures with the dashes don't work as the dash is in \verbatim@nolig@list, a command that \verb uses to suppress actively ligatures with these chars. – Ulrike Fischer Mar 26 '17 at 21:47
  • Very nice! +50 in a few days. – Henri Menke Dec 14 '17 at 20:40
  • Thanks @egreg for the edit! Confirms my hunch and fixes most of the ligatures :) Interesting that there's still a couple of ligatures which don't appear (the ones I could notice: ~~~, {- -} =~). – JP-Ellis Dec 15 '17 at 4:06
6

It is also possible to use Fira Code in ConTeXt. However, not all ligatures seem to work there. Unfortunately I have no idea why.

\definefontfeature
  [firacode-ligs]
  [mode=node,
   calt=yes]

\starttypescriptcollection[firacode]

  \starttypescript [mono] [firacode]
    \definefontsynonym [FiraCodeBold]    [file:FiraCode-Bold.otf]    [features=firacode-ligs] 
    \definefontsynonym [FiraCodeLight]   [file:FiraCode-Light.otf]   [features=firacode-ligs] 
    \definefontsynonym [FiraCodeMedium]  [file:FiraCode-Medium.otf]  [features=firacode-ligs] 
    \definefontsynonym [FiraCodeRegular] [file:FiraCode-Regular.otf] [features=firacode-ligs] 
    \definefontsynonym [FiraCodeRetina]  [file:FiraCode-Retina.otf]  [features=firacode-ligs] 
  \stoptypescript

  \starttypescript [mono] [firacode] [name]
    \setups[font:fallback:mono]
    \definefontsynonym [Mono]     [FiraCodeRegular]
    \definefontsynonym [MonoBold] [FiraCodeBold]
  \stoptypescript

  \starttypescript [firacode]
    \definetypeface [\typescriptone] [rm] [serif] [modern]   [default] [features=default]
    \definetypeface [\typescriptone] [ss] [sans]  [modern]   [default] [features=default]
    \definetypeface [\typescriptone] [tt] [mono]  [firacode] [default]
    \definetypeface [\typescriptone] [mm] [math]  [modern]   [default] [features=default]
  \stoptypescript

\stoptypescriptcollection

\setupbodyfont[firacode]

\starttext

\starttyping
           .= .- := =:=
        == != === !== =/=

    <<- <-- <- <-> -> --> ->>
<=< <<= <==    <=> => ==> =>> >=>
    >>= >>- >-     -< -<< =<<
        <~~ <~ ~~~ ~> ~~>

     <<< << <= <>  >= >> >>>
            <| <|> |>

            <$ <$> $>
            <+ <+> +>
            <* <*> *>

       \\ \\\ {- -} // ///
          /* /** **/ */ 
      </ <!-- www  --> />
      0xF  9:45  m-x *ptr

       ;; ;;; :: ::: !! !!!
       ?? ??? %% %%% && &&& 
       || ||| .. ... ..< []
       -- --- ++ +++ ** ***

          ~= ~- -~ =~ ~@
        ^= ?= /= /== |= ||=
           ## ### ####
         #{ #[ #( #? #_ #_(


a*b a*A B*b A*B *a *A a* A*
a-b a-A B-b A-B -a -A a- A-
a+b a+A B+b A+B +a +A a+ A+
a:b a:A B:b A:B :a :A a: A:
\stoptyping

\stoptext

enter image description here

| improve this answer | |

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