1gv(3guile)                                                          gv(3guile)
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NAME

6       gv_guile - graph manipulation in guile
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SYNOPSIS

10       (load-extension "./libgv.so" "SWIG_init")
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USAGE

INTRODUCTION

15       gv_guile  is a dynamically loaded extension for guile that provides ac‐
16       cess to the graph facilities of graphviz.
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COMMANDS

20       New graphs
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22       New empty graph
23              graph_handle gv.graph (name);
24              graph_handle gv.digraph (name);
25              graph_handle gv.strictgraph (name);
26              graph_handle gv.strictdigraph (name);
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28       New graph from a dot-syntax string or file
29              graph_handle gv.readstring (string);
30              graph_handle gv.read (string filename);
31              graph_handle gv.read (channel);
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33       Add new subgraph to existing graph
34              graph_handle gv.graph (graph_handle, name);
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36       New nodes
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38       Add new node to existing graph
39              node_handle gv.node (graph_handle, name);
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41       New edges
42
43       Add new edge between existing nodes
44              edge_handle gv.edge (tail_node_handle, head_node_handle);
45
46       Add a new edge between an existing tail node, and  a  named  head  node
47       which will be induced in the graph if it doesn't already exist
48              edge_handle gv.edge (tail_node_handle, head_name);
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50       Add  a  new  edge  between an existing head node, and a named tail node
51       which will be induced in the graph if it doesn't already exist
52              edge_handle gv.edge (tail_name, head_node_handle);
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54       Add a new edge between named tail  and head nodes which will be induced
55       in the graph if they don't already exist
56              edge_handle gv.edge (graph_handle, tail_name, head_name);
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58       Setting attribute values
59
60       Set value of named attribute of graph/node/edge - creating attribute if
61       necessary
62              string gv.setv (graph_handle, attr_name, attr_value);
63              string gv.setv (node_handle, attr_name, attr_value);
64              string gv.setv (edge_handle, attr_name, attr_value);
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66       Set value of existing attribute  of  graph/node/edge  (using  attribute
67       handle)
68              string gv.setv (graph_handle, attr_handle, attr_value);
69              string gv.setv (node_handle, attr_handle, attr_value);
70              string gv.setv (edge_handle, attr_handle, attr_value);
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72       Getting attribute values
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74       Get value of named attribute of graph/node/edge
75              string gv.getv (graph_handle, attr_name);
76              string gv.getv (node_handle, attr_name);
77              string gv.getv (edge_handle, attr_name);
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79       Get value of attribute of graph/node/edge (using attribute handle)
80              string gv.getv (graph_handle, attr_handle);
81              string gv.getv (node_handle, attr_handle);
82              string gv.getv (edge_handle, attr_handle);
83
84       Obtain names from handles
85              string gv.nameof (graph_handle);
86              string gv.nameof (node_handle);
87              string gv.nameof (attr_handle);
88
89       Find handles from names
90              graph_handle gv.findsubg (graph_handle, name);
91              node_handle gv.findnode (graph_handle, name);
92              edge_handle gv.findedge (tail_node_handle, head_node_handle);
93              attribute_handle gv.findattr (graph_handle, name);
94              attribute_handle gv.findattr (node_handle, name);
95              attribute_handle gv.findattr (edge_handle, name);
96
97       Misc graph navigators returning handles
98              node_handle gv.headof (edge_handle);
99              node_handle gv.tailof (edge_handle);
100              graph_handle gv.graphof (graph_handle);
101              graph_handle gv.graphof (edge_handle);
102              graph_handle gv.graphof (node_handle);
103              graph_handle gv.rootof (graph_handle);
104
105       Obtain handles of proto node/edge for setting default attribute values
106              node_handle gv.protonode (graph_handle);
107              edge_handle gv.protoedge (graph_handle);
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109       Iterators
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111       Iteration termination tests
112              bool gv.ok (graph_handle);
113              bool gv.ok (node_handle);
114              bool gv.ok (edge_handle);
115              bool gv.ok (attr_handle);
116
117       Iterate over subgraphs of a graph
118              graph_handle gv.firstsubg (graph_handle);
119              graph_handle gv.nextsubg (graph_handle, subgraph_handle);
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121       Iterate over supergraphs of a graph (obscure and rarely useful)
122              graph_handle gv.firstsupg (graph_handle);
123              graph_handle gv.nextsupg (graph_handle, subgraph_handle);
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125       Iterate over edges of a graph
126              edge_handle gv.firstedge (graph_handle);
127              edge_handle gv.nextedge (graph_handle, edge_handle);
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129       Iterate over outedges of a graph
130              edge_handle gv.firstout (graph_handle);
131              edge_handle gv.nextout (graph_handle, edge_handle);
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133       Iterate over edges of a node
134              edge_handle gv.firstedge (node_handle);
135              edge_handle gv.nextedge (node_handle, edge_handle);
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137       Iterate over out-edges of a node
138              edge_handle gv.firstout (node_handle);
139              edge_handle gv.nextout (node_handle, edge_handle);
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141       Iterate over head nodes reachable from out-edges of a node
142              node_handle gv.firsthead (node_handle);
143              node_handle gv.nexthead (node_handle, head_node_handle);
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145       Iterate over in-edges of a graph
146              edge_handle gv.firstin (graph_handle);
147              edge_handle gv.nextin (node_handle, edge_handle);
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149       Iterate over in-edges of a node
150              edge_handle gv.firstin (node_handle);
151              edge_handle gv.nextin (graph_handle, edge_handle);
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153       Iterate over tail nodes reachable from in-edges of a node
154              node_handle gv.firsttail (node_handle);
155              node_handle gv.nexttail (node_handle, tail_node_handle);
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157       Iterate over nodes of a graph
158              node_handle gv.firstnode (graph_handle);
159              node_handle gv.nextnode (graph_handle, node_handle);
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161       Iterate over nodes of an edge
162              node_handle gv.firstnode (edge_handle);
163              node_handle gv.nextnode (edge_handle, node_handle);
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165       Iterate over attributes of a graph
166              attribute_handle gv.firstattr (graph_handle);
167              attribute_handle gv.nextattr (graph_handle, attr_handle);
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169       Iterate over attributes of an edge
170              attribute_handle gv.firstattr (edge_handle);
171              attribute_handle gv.nextattr (edge_handle, attr_handle);
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173       Iterate over attributes of a node
174              attribute_handle gv.firstattr (node_handle);
175              attribute_handle gv.nextattr (node_handle, attr_handle);
176
177       Remove graph objects
178              bool gv.rm (graph_handle);
179              bool gv.rm (node_handle);
180              bool gv.rm (edge_handle);
181
182       Layout
183
184       Annotate  a  graph  with  layout attributes and values using a specific
185       layout engine
186              bool gv.layout (graph_handle, string engine);
187
188       Render
189
190       Render a layout into attributes of the graph
191              bool gv.render (graph_handle);
192
193       Render a layout to stdout
194              bool gv.render (graph_handle, string format);
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196       Render to an open file
197              bool gv.render (graph_handle, string format, channel fout);
198
199       Render a layout to an unopened file by name
200              bool gv.render (graph_handle, string format, string filename);
201
202       Render to a string result
203              string gv.renderresult (graph_handle ing, string format);
204              gv.renderresult (graph_handle, string format, string outdata);
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206       Render to an open channel
207              bool gv.renderchannel (graph_handle, string format, string chan‐
208              nelname);
209
210       Render a layout to a malloc'ed string, to be free'd by the caller
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212       (deprecated - too easy to leak memory)
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214       (still needed for "eval [gv::renderdata $G tk]" )
215              string gv.renderdata (graph_handle, string format);
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217       Writing graph back to file
218              bool gv.write (graph_handle, string filename);
219              bool gv.write (graph_handle, channel);
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221       Graph transformation tools
222              bool gv.tred (graph_handle);
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KEYWORDS

226       graph, dot, neato, fdp, circo, twopi, guile.
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231                                  26 May 2021                       gv(3guile)
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