1 ;;;; graphviz.scm -- utilities for creating graphviz output
3 ;;;; source file of the GNU LilyPond music typesetter
5 ;;;; (c) 2007--2009 Joe Neeman <joeneeman@gmail.com>
8 (define-module (scm graphviz)
11 (make-empty-graph add-node add-edge add-cluster
15 (define graph-type (make-record-type "graph" '(nodes edges clusters name)))
17 (define make-graph (record-constructor graph-type))
18 (define (make-empty-graph name) (make-graph '() '() '() name))
20 (define nodes (record-accessor graph-type 'nodes))
21 (define edges (record-accessor graph-type 'edges))
22 (define clusters (record-accessor graph-type 'clusters))
23 (define set-nodes! (record-modifier graph-type 'nodes))
24 (define set-edges! (record-modifier graph-type 'edges))
25 (define set-clusters! (record-modifier graph-type 'clusters))
27 (define (add-cluster graph node-id cluster-name)
28 (let* ((cs (clusters graph))
29 (cluster (assq cluster-name cs))
30 (already-in-cluster (if cluster
33 (set-clusters! graph (assq-set! cs
35 (cons node-id already-in-cluster)))))
37 (define (add-node graph label . cluster-name)
38 (let* ((ns (nodes graph))
40 (set-nodes! graph (assq-set! ns id label))
41 (if (and (not (null? cluster-name))
42 (string? (car cluster-name)))
43 (add-cluster graph id (car cluster-name)))
46 (define (add-edge graph node1 node2)
47 (set-edges! graph (cons `(,node1 . ,node2) (edges graph))))
49 (define (graph-write graph out)
50 (let ((ns (nodes graph))
52 (cs (clusters graph)))
53 (ly:message (format (_ "Writing graph `~a'...") (port-filename out)))
54 (display "digraph G {\nrankdir=\"LR\"\nnode [shape=rectangle]\n" out)
55 (map (lambda (n) (display (format "~a [label=\"~a\"]\n" (car n) (cdr n)) out))
57 (map (lambda (e) (display (format "~a -> ~a\n" (car e) (cdr e)) out))
60 (display (format "subgraph cluster_~a {\nlabel= \"~a\"\ncolor=blue\n"
61 (string-filter (car c) char-alphabetic?)
64 (map (lambda (n) (display (format "~a\n" n) out)) (cdr c))