terraform/digraph/graphviz.go

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2014-05-24 21:47:04 +02:00
package digraph
import (
"fmt"
"io"
)
// GenerateDot is used to emit a GraphViz compatible definition
// for a directed graph. It can be used to dump a .dot file.
func GenerateDot(nodes []Node, w io.Writer) {
w.Write([]byte("digraph {\n"))
defer w.Write([]byte("}\n"))
for _, n := range nodes {
w.Write([]byte(fmt.Sprintf("\t%s;\n", n)))
for _, edge := range n.Edges() {
target := edge.Tail()
line := fmt.Sprintf("\t%s -> %s [label=\"%s\"];\n",
n, target, edge)
w.Write([]byte(line))
}
}
}