Multiline shebang is not supported

[rikkimax]

Multiline shebangs are not currently supported. This could be useful in some software like Nix.

It should be an easy fix in both dmd and dub.

dub/source/dub/dub.d

Line 507 in 2ea8838

if (file_content.startsWith("#!")) {

Related dmd issue: https://issues.dlang.org/show_bug.cgi?id=24194

[nekowinston]

Two examples of how this could be used, both don't work at the moment:

#!/usr/bin/env nix-shell
#!nix-shell -i dub -p dub ldc
import std.stdio;

void main()
{
    writeln("Hello, world!");
}

#!/usr/bin/env nix-shell
#!nix-shell -i dub -p dub ldc
/+ dub.sdl:
   name "hello_vibed"
   dependency "vibe-d" version="~>0.9.0"
+/
import vibe.vibe;

void main()
{
    listenHTTP("127.0.0.1:8080", (req, res) {
        res.writeBody("Hello Vibe.d: " ~ req.path);
    });

    runApplication();
}

The double-shebang is enforced by nix-shell

To do this, start the script with multiple shebang (#!) lines.
The first shebang line is always #! /usr/bin/env nix-shell.
The second shebang line declares the script language and the script dependencies.

[Geod24]

@rikkimax : Is there a spec somewhere or is this a Nix-specific feature ? Never seen it used anywhere else.

[rikkimax]

It is nix specific. POSIX is single line only if I remember right.

…

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