Set cm-unicode font for latex if available (fixes #1673) #1688
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The current latex base template uses the ucs package with mathletters, but as it does not also set utf8x on inputenc, the ucs package does not work as intended, and Greek letters do not appear in math. As utf8x and ucs are somewhat outdated and problematic, this PR uses a few conditions to try to enable Greek letters in both math and text. For pdflatex, if the alphabeta package (part of greek-inputenc, and not necessarily installed) is present, this is used, as it better supports Greek math and text, including diacritics. It it is not, ucs with mathletters is used, which will allow math, and some text, though diacritics will cause an error. For xelatex and lualatex, this instead uses unicode-math, which handles math well but does not support pdflatex. While this arrangement does support text, note that by default, the fonts used are unlikely to include support for Greek text, and the glyphs will be omitted (both for text and for monospace text), particularly since Latin Modern does not support Greek text. I have an additional change which uses Computer Modern Unicode if available, but I'd like to keep these separate, as it's unclear to me that setting the font in this template would be a good idea. Mathpazo for pdflatex is removed for consistency with xelatex/lualatex output, and the position of the conditional is moved to avoid an order conflict with the ams packages; this more closely matches the position of unicode-math in pandoc's template.
For LuaLaTeX and XeLaTeX, the default fonts usually don't support Greek text, causing problems when Greek letters are used outside of math mode (eg, as text or as symbols in code). This change to the base template uses the cm-unicode fonts, if they are available. Fonts are left unchanged if cm-unicode is not available, in which case Greek letters in math will still work, but text will be missing. Loading is done here using cm-unicode's filenames, rather than the fonts' symbolic names, because XeLaTeX cannot search for symbolic names of fonts that are not available to the system (but may be available to LaTeX). LuaLaTeX does not have this limitation, but can also load using filenames.
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cc @ivanov since you reviewed other related changes lately. |
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This includes PR #1687 and depends on it, but makes potentially more problematic changes.
For LuaLaTeX and XeLaTeX, the default fonts usually don't support
Greek text, causing problems when Greek letters are used outside of
math mode (eg, as text or as symbols in code). This change to the
base template uses the cm-unicode fonts, if they are available.
Fonts are left unchanged if cm-unicode is not available, in which
case Greek letters in math will still work, but text will be missing.
Loading is done here using cm-unicode's filenames, rather than the
fonts' symbolic names, because XeLaTeX cannot search for symbolic
names of fonts that are not available to the system (but may be
available to LaTeX). LuaLaTeX does not have this limitation, but can
also load using filenames.