Re: environment variable configuration and documentation

That's interesting. But it does not work properly. Conversion of the TeX envvars is not as simple as that, there are two things to consider:

1) an empty directory in a directory list means "insert here the default list (meaning root dir config for MikTeX, AFAIU)

2) a duplicate tailing / means "look at this directory recursively".


I compiled display.c, and placed display.exe under /bin


Then I tried this:


$ export TEXINPUTS='/bin//::/local/bin'; display /bin/display.exe
Supplied argument: c:/Nos_Programmes/msys/bin/display.exe.
TEXINPUTS: c:\Nos_Programmes\msys\bin\;c:\Nos_Programmes\msys\local\bin.


Please note that my MSYS root dir is c:\Nos_Programmes\msys


The value of TEXINPUTS as converted by MSYS and passed to display.exe is incorrect, it should have been:


c:\Nos_Programmes\msys\bin\\;;c:\Nos_Programmes\msys\local\bin

 look at that ------------^^

That makes me think that a function missing in MSYS is some configuration file where the user tells which variable to convert, and how to convert them. This file could look like


PATH=

TEXINPUTS=keep all empty up to 1, keep all tailing / up to 2

...



Anyway, it seems that MikTeX does not implement properly reading from TEXINPUTS, as the cur directory cannot be given less precedence than some other directory.


   Vincent.


----------------------------------------
> From: [email protected]
> To: [email protected]
> Date: Sun, 20 Sep 2015 19:11:50 +0000
> Subject: Re: [MiKTeX] environment variable configuration and documentation
>
> Vincent Belaïche wrote:
>> If I do the same experiment with additionally the --tidy option to
>> texi2pdf, the TEXINPUTS is set to :
>>
>>
>> /c/Programmes/installation/texinfo-
>> install/trunk/util/dummy.t2d/pdf/bak:/c/Programmes/installation/texinfo-
>> install/trunk/util:/c/Programmes/installation/texinfo-
>> install/trunk/util/.:
>>
>>
>> ie same as before, and the command run is the following:
>>
>>
>> pdfetex -recorder '\catcode126=12 \def\normaltilde{~}\catcode126=13
>> \let~\normaltilde ' '\input' '/c/Programmes/installation/texinfo-
>> install/trunk/util/./dummy.texi'
>>
>>
>> In this second case the input document file path is clearly an MSYS path,
>> not an MSW path. And the compilation works fine all the same.
>>
>>
>> So, I don't know how MikTeX achieves that internally, but for sure
>> somewhere you are calling some MSYS Library (msys-1.0.dll ?) to do that
>> conversion. I noticed that it works even with MSYS paths that are mounted
>> in my ~/etc/fstab
>
> It is not MiKTeX which does this conversion, but MSYS bash (or more specifically, the MSYS runtime which Bash is compiled against), see http://www.mingw.org/wiki/Posix_path_conversion
>
> My MiKTeX 2.9 installation hasn't been updated in a while, but I believe the MiKTeX texi2* files are not wrappers, but programs implementing the same functionality (i.e. they are not thin wrappers around shell scripts).
>
> MSYS also does the same with the environment variables. I demonstrate this in a quick-and-dirty way on my computer using the MSYS2 Bash prompt provided by Git-Bash in Git-for-Windows and the mingw64 C compilers provided by Cygwin:
>
> display.c
> #include <stdlib.h>
> #include <stdio.h>
>
> int main (int argc, char *argv[])
> {
> printf("Supplied argument: %s\nTEXINPUTS: %s\n", argv[1], getenv("TEXINPUTS"));
>
> return 0;
> }
>
> Compile this using i686-w64-mingw64-gcc -o display.exe display.c
>
> ** Please note that display.exe is a native executable depending on neither cygwin1.dll nor msys-*.dll, just like MiKTeX's executables **
>
> Then from an MSYS bash prompt with display.exe in the current directory I run:
>
> Altus+DRA@Altus MINGW64 /c/Scratch
> $ export TEXINPUTS=/c/Windows:/c/Windows/system32
>
> Altus+DRA@Altus MINGW64 /c/Scratch
> $ ./display.exe /c/Windows
> Supplied argument: C:/Windows
> TEXINPUTS: C:\Windows;C:\Windows\system32
>
> And you can see that the supplied program (which in your case would be MiKTeX's entirely non-MSYS pdfetex.exe) is supplied with both a converted argument and a converted environment variable.
>
>
> David
>
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