Dash equivalent of $BASH_SOURCE (for setuptex)

[Mojca Miklavec <mojca.miklavec.lists@gmail.com>]

Hi everyone,

Hans wrote me the following, but I'm unable to figure it out myself.
The script "setuptex" (which is in fact not urgently needed as one can
just as well export the right path, but it comes in handy) can be used
in two ways:
    (a) . /path/to/context/tex/setuptex
    (b) . /path/to/context/tex/setuptex /path/to/context/tex
The first approach only works if the shell interpreting setuptex knows
where the sourced script is located.

Currently the script uses the following code and works in Bash, KSH
(and maybe some other shells as well, but I'm not sure which ones).

if [ z"$BASH_SOURCE" != z ]; then
  SCRIPTPATH="$BASH_SOURCE"
elif [ z"$KSH_VERSION" != z ]; then
  SCRIPTPATH="${.sh.file}"
else
  SCRIPTPATH="$0"
fi

Hans had problems with Dash, however, I have no clue how to enable (a)
in Dash. The (b) approach always works though, so in the worst case
the answer to Hans would be "provide the path to your tex root, or
write your own script with hardcoded path ;)", but if anyone has any
clue if finding path to the executed script is possible in Dash or in
any other POSIX-compatible way, please let me know.

Mojca

On Mon, Nov 19, 2012 at 10:31 AM, Hans Hagen wrote:
> Hi Mojca,
>
> One of the things you need to look into is the first-setup and setup tex
> scripts (just look at the dash issues thread) .. i have the impression that
> the setuptex script doesn't find its root (own) under dash because it has
> different $0 handling (dash is the debian variant of bash, so we're talking
> of debian installations)
>
> Hans
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