You can create directed edges on undirected graphs which results in syntax errors in dot

[Daniel Thomas]

Unless you call graph.SetDir(true) then calling graph.AddEdge(parent, name, true, make(map[string]string)) will result in syntax errors like:

Error: <stdin>: syntax error in line 2 near '->'

This should be documented on AddEdge.

[Walter Schulze]

How would you propose to do that?

[Daniel Thomas]

// If directed is set to true then SetDir(true) must also be called or there will be a syntax error in the output.

It would also be possible to produce a warning/panic/error in AddEdge if directed && !this.Directed { but that would change the API or be messy so documenting it is probably sufficient to avoid people making this mistake.

[Walter Schulze]

Sounds good :)

[Walter Schulze]

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