Hi!
Hartmut Goebel <h.goe...@crazy-compilers.com> skribis:
> answering on a mail which Ricardo CCed to me and which did not make it
> to the list yet. Thus I full-quote.
>
> Am 04.11.2017 um 23:30 schrieb Ricardo Wurmus:
>> How about this:
>>
>> --8<---------------cut here---------------start------------->8---
>> #!/home/rekado/.guix-profile/bin/guile --no-auto-compile
>> #!# (let (($0 (car (command-line)))) (execl
>> "/home/rekado/.guix-profile/bin/python3" $0 $0))
>> #!/home/rekado/.guix-profile/bin/python3
>> import sys; print("hello from python: "+sys.argv[0])
>> --8<---------------cut here---------------end--------------->8---
>>
>> The first two lines are Guile code, but they are also line comments in
>> shell, Perl, Python, Ruby, and R. The Guile code in this example calls
>> the script again as a Python script. Before doing that it can set
>> environment variables, like so:
>>
>> --8<---------------cut here---------------start------------->8---
>> #!/home/rekado/.guix-profile/bin/guile --no-auto-compile
>> #!#
>> #\- (setenv "PYTHONPATH" (string-append "/gnu/store/foo:/gnu/store/bar:"
>> (getenv "PYTHONPATH")))
>> #\- (let (($0 (car (command-line)))) (execl
>> "/home/rekado/.guix-profile/bin/python3" $0 $0))
>> #!/home/rekado/.guix-profile/bin/python3
>> import sys; print("hello from python: "+sys.argv[0])
>> print(sys.path)
>> --8<---------------cut here---------------end--------------->8---
>>
>> Did I overlook something? Or could we use this hack to remove separate
>> wrapper scripts for Perl, Python, Ruby, and R?
Overall this looks good to me (with the adjustments Hartmut mentions).
Now, we should have a white list of languages for which this can be
done. ‘wrap-program’ would grab the shebang and check if the
basename of the interpreter is in that white list.
Thoughts?
Ludo’.
