Fix compilation with Tectonic and xelatex (patch included)

[Konrad Höffner]

After cloning this repository, both tectonic ClassicThesis.tex and xelatex ClassicThesis.tex fail.

Tail of tectonic output:

error: classicthesis.sty:198: Package fontspec Error: The font "TeX Gyre Pagella" cannot be found.

For immediate help type H <return>
error: halted on potentially-recoverable error as specified

Tail of xelatex output:

! Package fontspec Error: The font "TeX Gyre Pagella" cannot be found.

For immediate help type H <return>.
 ...                                              

l.198    }

The following changes fix the compilation.

I do not have the rights to create a pull request so I can only share the changes in text form:

classicthesis$ git diff classicthesis.sty 
diff --git a/classicthesis.sty b/classicthesis.sty
index 0105d61..a840605 100644
--- a/classicthesis.sty
+++ b/classicthesis.sty
@@ -161,14 +161,17 @@
      \RequirePackage{fontspec}
      \ifthenelse{\boolean{ct@palatino}}% default
        {
-         \setmainfont[Ligatures=TeX,Numbers=OldStyle]{TeX Gyre Pagella} % Palatino clone
+         \setmainfont[Ligatures=TeX,Numbers=OldStyle,
+           BoldFont = texgyrepagella-bold.otf,
+           ItalicFont = texgyrepagella-italic.otf,
+           BoldItalicFont = texgyrepagella-bolditalic.otf]{texgyrepagella-regular.otf} % Palatino clone
          \linespread{1.05} % a bit more for Palatino
          \RequirePackage{unicode-math}
-         \setmathfont{TeX Gyre Pagella Math}
+         \setmathfont{texgyrepagella-math.otf}
        }{\relax} % use class' default font
      \ifthenelse{\boolean{ct@beramono}}%
-       {\setmonofont[Scale=0.85]{DejaVu Sans Mono}} % like Bera; Scale=MatchLowercase
-       {\setmonofont[Scale=1]{Latin Modern Mono}}
+       {\setmonofont[Scale=0.85]{DejaVuSansMono.ttf}} % like Bera; Scale=MatchLowercase
+          {\setmonofont[Scale=1]{lmmono10-regular.otf}}
      % font for the chapter numbers will be defined in the old way below
      % because there is no OpenType Euler font; this is how it should be done:
      %\newfontface\chapterNumber[Scale=7,Color=000000]{TeX Gyre Pagella Bold}

With those changes, it successfully compiles with all three of pdflatex (over latexmk -pdf), xelatex and tectonic.

However I’m usually just a LaTeX user not a package writer, so I can’t guarantee that there aren’t any side effects.

Environment

Linux archlinux 6.3.8-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 14 Jun 2023 20:10:31 +0000 x86_64 GNU/Linux

XeTeX 3.141592653-2.6-0.999995 (TeX Live 2023/Arch Linux)

Tectonic 0.14.1

texlive version 2023.66594-14 with installed packages texlive-: basic, bibtexextra, bin, binextra, fontsextra, fontsrecommended, langgerman, latex, latexextra, latexrecommended, mathscience, pictures

[Ivo Pletikosić]

Thank you for reporting, @Konrad Höffner. I'm pretty sure I had the same problem and asked for solution somewhere, but I really can't remember where. I was told there's a smart way of finding fonts by these packages, which is what we're using, and that those sometimes fail. I think the issue was with how they made the font package. Try reporting to archlinux, and I'll try to find where I reported my problem (fedora linux). Unfortunately, the solution that worked for you might not work for others because fonts are named differently.

[André Miede]

Thanks for your work, Ivo!

[Konrad Höffner]

I am not a font expert, but according to Will Robertson (the author of fontspec?) in 2018, loading fonts by name is discouraged exactly because of those types of errors, see https://tug.org/TUGboat/tb39-2/tb122robertson-fontspec.pdf.

He recommends loading fonts like this:

\setmainfont{texgyrepagella}[
Extension= .otf,
UprightFont=*-regular,
ItalicFont= *-italic,
BoldFont= *-bold,
BoldItalicFont = *-bolditalic,
]

Tectonic also does not have the capability to load fonts by name at all, see https://github.com/tectonic-typesetting/tectonic/issues/1118.

This it seems to me as if this is not the problem of Arch Linux itself and if the above solution is more portable and leads to less errors, I would ask you to reconsider this issue.

[André Miede]

Thank you for being so persistent in this matter. You are right.

I included a fix and some adjustments in the develop branch for the next release: https://bitbucket.org/amiede/classicthesis/commits/14562cc4c31decf2627d1f02252468980b4ec639

Could you please have a look whether this works for your context?

[Konrad Höffner]

Thank you for reconsidering! Tectonic now successfully downloads and uses “TeX Gyre Pagella", however now it has another fontspec error with “DejaVuSansMono”, which requires similar treatment:

diff --git a/classicthesis.sty b/classicthesis.sty
index f680858..1970765 100644
--- a/classicthesis.sty
+++ b/classicthesis.sty
@@ -182,7 +182,12 @@
          \setmathfont{texgyrepagella-math}[Extension= .otf]%
        }{\relax} % use class' default font
      \ifthenelse{\boolean{ct@beramono}}%
-       {\setmonofont[Scale=0.85]{DejaVuSansMono}} % like Bera; Scale=MatchLowercase
+       {\setmonofont[Scale=0.85]{DejaVuSansMono}[
+        Extension      = .ttf,
+        BoldFont       = *-Bold,
+        ItalicFont     = *-Oblique,
+        BoldItalicFont = *-BoldOblique
+]} % like Bera; Scale=MatchLowercase
        {\setmonofont[Scale=1]{lmmono10-regular}[Extension= .otf]}  
      \ifthenelse{\boolean{ct@eulermath}}%
      {\PassOptionsToPackage{math-style=upright}{unicode-math}%

After that, I still get errors with euler-math but when I set both “eulermath” and “eulerchapternumbers” to false then it compiles, is that working as intended?

‌

--- a/classicthesis-config.tex
+++ b/classicthesis-config.tex
@@ -32,9 +32,9 @@
   drafting=true,    % print version information on the bottom of the pages
   tocaligned=false, % the left column of the toc will be aligned (no indentation)
   dottedtoc=false,  % page numbers in ToC flushed right
-  eulerchapternumbers=true, % use AMS Euler for chapter font (otherwise Palatino)
+  eulerchapternumbers=false, % use AMS Euler for chapter font (otherwise Palatino)
   floatperchapter=true,     % numbering per chapter for all floats (i.e., Figure 1.1)
-  eulermath=true,  % use awesome Euler fonts for mathematical formulae (only with pdfLaTeX)
+  eulermath=false,  % use awesome Euler fonts for mathematical formulae (only with pdfLaTeX)

‌

[André Miede]

Oh, yes. Sorry, I forgot that.

Your corrections part of the latest develop-commit.