Setting mainSourceFile should not require sourceFiles

[ghost]

Typically dub will complain when I don't specify mainSourceFile, but when I have example code where the only sources I need is one single file then using mainSourceFile alone is not enough, e.g.:

        {
            "name": "ProcessAPI",
            "platforms": ["windows"],
            "targetName": "ProcessAPI",
            "targetType": "executable",
            "targetPath" : "bin",
            "mainSourceFile": "examples/ProcessAPI.d",
            "importPaths": [
                "src"
            ],
        },

This will create a linker error, even though mainSourceFile is the only file I need. As a workaround I have to duplicate the work and write sourceFiles:

        {
            "name": "ProcessAPI",
            "platforms": ["windows"],
            "targetName": "ProcessAPI",
            "targetType": "executable",
            "targetPath" : "bin",
            "mainSourceFile": "examples/ProcessAPI.d",
            "sourceFiles": [
                "examples/ProcessAPI.d",
            ],
            "importPaths": [
                "src"
            ],
        },

I'd rather avoid having to copy-paste a lot.

[ghost]

Btw, are comment lines supported in a package file? Thought # might work, but no dice. The package format page doesn't seem to mention comments.

[MrSmith33]

JSON doesn't support comments.

[etcimon]

In another ticket it was talked about how comments could fit in and Sönke suggested SDL which does seem like a more proper fit for dub project files because it also has more features (tags, namespaces, attributes, comments, with values: dates, times, strings, numbers, floats, arrays...).

https://github.com/Abscissa/SDLang-D

it looks like xml & json merged together: <tag ns:attribute="value" ns2:attribute2="2014/04/15"><othertag person="name" /></tag>

would be:

tag ns:attribute="value" \ -- notice the line break
ns2:attribute2=2014/04/15 {
    othertag person="name" # some comment
     // othertag person="name2" => 2 entries make an array?
    /* notag because:commented="out" */
}

which D can use as a tree and loop through / select based on attributes and namespaces, and I like this option, it wouldn't be breaking to add it aside