[luatex] \openin with extensionless files.

[luigi scarso]

On Thu, Jan 23, 2020 at 3:01 PM luigi scarso <luigi.scarso at gmail.com> wrote:

>
>
> On Wed, Jan 22, 2020 at 10:10 PM David Carlisle <d.p.carlisle at gmail.com>
> wrote:
>
>> With a file with no extension in the same directory (say  "test") then
>>
>> \input test
>>
>> and
>>
>> \input{test}
>>
>> both work but
>>
>> \openin test
>>
>> and
>>
>> \openin{test}
>>
>> do not work the same way, it only sees the file if the luatex-specific
>> braced form is used.
>>
>> That means for example the LaTeX \IfFileExists macro reports the file
>> as not existing with luatex and existing with pdftex and xetex.
>>
>> We could (and probably will) have a luatex-specific code branch here
>> to add the braces, but is this difference from pdftex  intentional? It
>> has been this way since at least texlive 2017, but still seems strange
>> and not what one would expect from the documentation
>>
>>
>> This causes some problems in end-user documents, for example
>>
>>
>> https://tex.stackexchange.com/questions/511684/inputting-extension-less-files-with-luatex-fails-after-recent-latex-update/511688?noredirect=1#comment1293990_511688
>>
>>
>>
>>
>> This test file:
>>
>> \openin0 test
>>
>> \ifeof0
>> \immediate\write20{NO FILE test}
>> \else
>> \immediate\write20{FILE test}
>> \fi
>>
>> \ifx\directlua\undefined\else
>>
>> \openin2{test}
>>
>> \ifeof2
>> \immediate\write20{NO FILE test}
>> \else
>> \immediate\write20{FILE test}
>> \fi
>>
>> \fi
>>
>> \end
>>
>>
>> Produces the terminal output below
>>
>>
>> $ cat test
>> hello
>>
>> $ luatex noext
>> This is LuaTeX, Version 1.10.0 (TeX Live 2019)
>>  restricted system commands enabled.
>> (./noext.tex
>> NO FILE test
>> FILE test
>> )
>>
>> and with pdftex
>>
>> $ pdftex noext
>> This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020)
>> (preloaded format=pdftex)
>>  restricted \write18 enabled.
>> entering extended mode
>> (./noext.tex
>> FILE test
>>
>>
>> David
>>
>
> We already have patched something in rev. 7213
> so this is what we have now
>
> $ cat test.tex
> hello
>
>
ah ok, I should test
$ cat test
hello

Sorry.. confirmed, now I have

luatex-gadgets.tex)
NO FILE test
FILE test
)

-- 
luigi
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