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cmd/go: use "go list -json" list two or more packages won't get correct json output #12643

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m3ng9i opened this issue Sep 16, 2015 · 1 comment
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cmd/go: use "go list -json" list two or more packages won't get correct json output #12643

m3ng9i opened this issue Sep 16, 2015 · 1 comment
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@m3ng9i
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m3ng9i commented Sep 16, 2015

I use the following command to list information of two packages:

go list -json builtin container/ring

Then I got the result:

{
        "Dir": "D:\\go\\go1.5.1\\src\\builtin",
        "ImportPath": "builtin",
        "Name": "builtin",
        "Doc": "Package builtin provides documentation for Go's predeclared identifiers.",
        "Target": "D:\\go\\go1.5.1\\pkg\\windows_386\\builtin.a",
        "Goroot": true,
        "Standard": true,
        "Stale": true,
        "Root": "D:\\go\\go1.5.1",
        "GoFiles": [
                "builtin.go"
        ],
        "Deps": [
                "runtime",
                "unsafe"
        ]
}
{
        "Dir": "D:\\go\\go1.5.1\\src\\container\\ring",
        "ImportPath": "container/ring",
        "Name": "ring",
        "Doc": "Package ring implements operations on circular lists.",
        "Target": "D:\\go\\go1.5.1\\pkg\\windows_386\\container\\ring.a",
        "Goroot": true,
        "Standard": true,
        "Root": "D:\\go\\go1.5.1",
        "GoFiles": [
                "ring.go"
        ],
        "Deps": [
                "runtime",
                "unsafe"
        ],
        "TestGoFiles": [
                "ring_test.go"
        ],
        "TestImports": [
                "fmt",
                "testing"
        ]
}

You can see, the format of the result is:

{
    ...
}
{
    ...
}

not:

[{
    ...
},
{
    ...
}]

There miss a comma and a pair of square brackets, so the json decorder cannot decorde the output.

My go version: go1.5.1 windows/386
@bradfitz
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Sorry, but this isn't something we can change at this point for compatibility reasons.

Note that Go's and other JSON decoders will let you decode multiple JSON objects from a stream in a row, ignoring whitespace. It's not a valid single JSON value (not an array) but it's valid multiple JSON values.

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@bradfitz @m3ng9i @gopherbot