shebang launcher for D programs

[Andrei Alexandrescu (See Website For Email)]

Anders F Björklund wrote:
> Andrei Alexandrescu (See Website For Email) wrote:
> 
>>> The #! thing would be cool, but since I run Windows, I don't tend to use
>>> it.  That, and the fact that I tend to use lots of switches :3
>>
>> Do your switches vary from one build to the next, or only from one 
>> file to the next? If the latter, you could use:
>>
>> #!/path/to/rundmd -clean -debug -etc
>>
>> as the first line of the program containing main(), and that works 
>> under cygwin. You don't have to build your program - ever. It builds 
>> itself when necessary.
> 
> When doing more complex such "scripts", this seems to work OK:
> 
> #!/usr/bin/env rdmd --compiler=rebuild
> 
> i.e. just using rebuild as a drop-in replacement for gdmd/dmd
> 
> 
> This caches the resulting program in /tmp (or $TEMP on Windows)
> and passes any additional arguments over to the compiled program:
> 
> $ more run.d
> #!/usr/bin/env rdmd --compiler=rebuild
> 
> import std.stdio;
> 
> void main(char[][] args)
> {
>   foreach (char[] arg; args)
>     writefln("%s", arg);
> }
> 
> $ ./run.d foo bar
> /tmp/run-501-234881028-13386453-4D8B5B0DF758A62AAB383FC432A9EED4
> foo
> bar
> 
> The program name is a little "interesting", but otherwise it's good.
> (for shell scripts or perl programs, then $0 would be the script...)
> 
> Tested briefly under Mac OS X and Linux, without larger incidents ?
> (rdmd --force would rebuild the program if external things changed)
> 
> 
> Should also work OK with Tango.

This won't work if your script includes one of your own modules.

Andrei