Font naming problem

[Scott Kostyshak]

On Sun, Jan 30, 2022 at 12:51:26PM +0100, Kornel Benko wrote:
> This is for lyx2.4 _and_ lyx2.3
> 
> 1. open new file in lyx
> 2. write some text
> 3. Document->Settings->Fonts
>    3a. check: Use non-TeX fonts
>    3b. Select roman font: "David CLM"
>    3c. Formats->Default output format: PDF(LuaTeX)
> 4. Try a preview ==> Package fontspec Error: The font "DavidCLM" cannot be found.
> 5. save the file
> 
> 6. Now check that there _is_ a font matching "David"
>  $ fc-list -f "%{fullname}\n" |grep David
> 	David CLM Medium
> 	David CLM Medium Italic
> 	David CLM Bold Italic
> 	David CLM Bold
> 7. OK, now edit the saved file with an editor and change
> 	\font_roman "default" "David CLM [bitstream]"
>    to
> 	\font_roman "default" "David CLM Medium [bitstream]"
> 8. open again with lyx
> 9. check the preview now works
> 10. Look into Document->Settings->Fonts->Roman
> 	==> David CLM Medium [bitstream] (not installed)
> 

I can reproduce, although I do not have "[bitstream]" and I'm not sure what refers to above.

> This does not feel OK.

Agreed. I do not know if it is a LyX issue or a luaotfload issue. It is
strange that XeTeX seems to work fine for the same example.

I don't understand much, but perhaps the following is related?

  https://github.com/latex3/luaotfload/issues/78

$ luaotfload-tool  --find 'David CLM'
luaotfload | db : Reload initiated (formats: otf,ttf,ttc); reason: Font "David CLM" not found.
luaotfload | resolve : sequence of 3 lookups yielded nothing appropriate.
luaotfload | resolve : Cannot find "David CLM" in index.
luaotfload | resolve : Hint: use the --fuzzy option to display suggestions.
$ luaotfload-tool  --find 'David CLM Medium'
luaotfload | resolve : Font "David CLM Medium" found!
luaotfload | resolve : Resolved file name "/usr/share/fonts/truetype/culmus/DavidCLM-Medium.otf"
$ 

Interestingly --fuzzy does not find what I thought it would.

$ luaotfload-tool --fuzzy --find 'David CLM'
luaotfload | db : Reload initiated (formats: otf,ttf,ttc); reason: Font "David CLM" not found.
luaotfload | resolve : sequence of 3 lookups yielded nothing appropriate.
luaotfload | resolve : Cannot find "David CLM" in index.
luaotfload | resolve : Looking for close matches, this may take a while ...
luaotfload | query : Distance from "davidclm": 4
    David CLM Bold
    Navilu
$

Scott
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