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In my scenario I am using my own custom font. It is an OpenType font - not a tex-packaged one either, just one I've made in FontCreator (Windows 7). Now, I want to use this font with lualatex, so I put a copy of myfont.otf here C:\texlive\2013\texmf-dist\fonts\truetype\public and it gets picked up.

My problem: If I update myfont.otf and replace the copy in that folder with a new one, it doesn't get used because lualatex is using the one in its cache, as is reflected in this log entry:

luaotfload | load: auto-selecting default features for script: dflt(load luc: C:/texlive/2013/texmf-var/luatex-cache/generic/fonts/otf/myfont.luc)

Now, so far the only way I have found to get my font used (after I've replaced it) is to:

  1. Delete lualatex's cache directories at C:\texlive\2013\texmf-var\luatex-cache\, %USERPROFILE%\.texlive2013\texmf-var and C:\texlive\texmf-var\lualatex-cache
  2. Then run texhash
  3. Then run udpmap

When I compile the next tex file, it rebuilds the cache using the new font:

luaotfload | resolve: font family='priory', subfamily='regular' found: c:/texliv
e/2013/texmf-dist/fonts/truetype/public/myfont.otf(save: C:/texlive/2013/texmf-v
ar/luatex-cache/generic/fonts/otf/myfont.lua)(save: C:/texlive/2013/texmf-var/lu
atex-cache/generic/fonts/otf/myfont.luc)

Is there a better way to do this? Can I rebuild the font cache without having to manually delete directories?

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    The luc doesn't contain the font, only informations about metrics etc. And you don't need to run texhash or updmap. Imho you can delete the cache with luaotfload-tool --cache=erase or luaotfload-tool --cache=purge (no idea what is the difference). – Ulrike Fischer Mar 13 '15 at 14:41
  • Not sure what purge does, but erase does erase the files in the cache folder at C:\texlive\2013\texmf-var\luatex-cache\generic\fonts\otf – bgmCoder Mar 13 '15 at 15:11
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    Not sure what purge does -- Recommended reading: man 1 luaotfload-tool; from that man page: “1. purge -> delete Lua files from cache; 2. erase -> delete Lua and Luc files from cache;”. – Philipp Gesang Mar 13 '15 at 17:29
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    Putting personal things in C:\texlive\2013\texmf-dist\fonts\truetype\public is not a good idea. Use C:\texlive\texmf-local\fonts\truetype\<fontname> creating the needed directories if not existent; <fontname> stands for an arbitrary string, say myfont if your font is myfont.ttf. Of course, if the font is OTF, use opentype instead of truetype. – egreg Mar 13 '15 at 17:36
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    @phg: we poor windows users can't use man. In texlive I can find a pdf-file with texdoc luaotfload-tool, in miktex I couldn't find nothing with texdoc, and with a file search in the doc folder only a luaotfload-tool.1. – Ulrike Fischer Mar 15 '15 at 11:14
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Well, I was manually deleting this directory: C:\texlive\2013\texmf-var\luatex-cache\

This same procedure is accomplished with the commandline (thanks Ulrik):

luaotfload-tool --cache=erase

Then, if your font name is different (or you added a new one), you need to do this:

texhash

However, the commenters to my question are right. It is better not to use a tex system folder. In Windows it is funny to call it a system folder since it only matters to tex. BUT I moved my fonts to C:\texlive\texmf-local\fonts\truetype\public and ran those commands and everything worked like it should. I can see from the compilation log that the fonts were pulled from the new location.

So this tex user directory is better, but the commands are the same:

luaotfload-tool --cache=erase
texhash

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