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add option for gen graphviz script #110

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add option for gen graphviz script #110

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16 changes: 12 additions & 4 deletions src/loom/io.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -35,12 +35,18 @@
"Renders graph g as a DOT-format string. Calls (node-label node) and
(edge-label n1 n2) to determine what labels to use for nodes and edges,
if any. Weights become edge labels unless a label is specified.
Labels also include attributes when the graph satisfies AttrGraph."
[g & {:keys [graph-name node-label edge-label]
:or {graph-name "graph"} :as opts }]
Labels also include attributes when the graph satisfies AttrGraph.
`global-attrs` for add some attr to graph, eg: {:overlap false} for neate"
[g & {:keys [graph-name node-label edge-label global-attrs]
:or {graph-name "graph"
global-attrs {:overlap false}}
:as opts }]
(let [d? (directed? g)
w? (weighted? g)
a? (attr? g)
global-attrs-str (->> global-attrs
(map #(format " %s=%s" (-> % first name) (second %)) ,,,)
(clojure.string/join "\n" ,,,))
node-label (or node-label
(if a?
#(attr g % :label)
Expand All @@ -55,7 +61,9 @@
sb (doto (StringBuilder.
(if d? "digraph \"" "graph \""))
(.append (dot-esc graph-name))
(.append "\" {\n"))]
(.append "\" {\n")
(.append global-attrs-str)
(.append "\n"))]
(doseq [k [:graph :node :edge]]
(when (k opts)
(doto sb
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