Switch to a more up to date TOML library

[spf13]

https://github.com/pelletier/go-toml seems like a good candidate.

[pelletier]

Maintainer of https://github.com/pelletier/go-toml here. Let me know if there is anything I can do to help!

[mohae]

It appears that https://github.com/pelletier/go-toml only does parsing. Encoding would be needed too; unless I'm missing something.

[bep]

Not sure what you refer to by encoding, but in the latest revision, you can get a "map of plain Go objects", which is what we need.

If it is more "up to date" (whatever that means; I'm guessing supporting more of the TOML spec and not more up to date in tech fashion, although there have been some fishy stuff in what we use now; an os.Exit on error being one I remember).

[bep]

Or: Do we ever write TOML?

[mohae]

https://github.com/spf13/hugo/blob/master/parser/frontmatter.go#L32

Also the next func.

[pelletier]

@mohae go-toml does serialize back to a string, see https://godoc.org/github.com/pelletier/go-toml#TomlTree.ToString

[mohae]

@pelletier thanks for the info! I missed that.

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