Edit distance comparison for commands

[clefable]

Reported by dcronin.

When someone does an invalid command, clef should output a "did you mean?" message if it's close enough to one of the valid commands. E.g. "clef: trivai" should result in "Unrecognized command: [trivai]. Did you mean [trivia]? (Try HELP for more information)"

[eriq-augustine]

This is somewhat related to the "Unambiguous Shorthand" feature.

On Mon, Sep 10, 2012 at 10:41 AM, Clefable notifications@github.com wrote:

Reported by dcronin.

When someone does an invalid command, clef should output a "did you mean?"
message if it's close enough to one of the valid commands. E.g. "clef:
trivai" should result in "Unrecognized command: [trivai]. Did you mean
[trivia]? (Try HELP for more information)"

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