rhizicore: don't move graph when only changing link or node text

Fixes #49

Note about solution: in general we need to find out whether the graph
from the new text (NewVertices, NewLinks) is homologous to the graph
from the old text (OldVertices, OldLinks). The implemented solution only
checks an easier case, where there is a single renamed vertex.

A better solution to do later:
- have textanalysis have state
- have textanalysis return the difference from the last state:
 nodes added
 nodes deleted
 nodes changed
- plus for bonus refactor all the editing functions (edit* in myGraph)

1 files changed, 29 insertions, 11 deletions

diff --git a/scripts/textanalysis.js b/scripts/textanalysis.js
index a93839aa..74b029ae 100644
--- a/scripts/textanalysis.js
+++ b/scripts/textanalysis.js
@@ -314,19 +314,37 @@ var textAnalyser2 = function (newtext, finalize) {
     lastnode = newnodes[nodeindex];
 
     ret.applyToGraph = function(graph) {
-        //REINITIALISE GRAPH (DUMB BUT IT WORKS)
-        graph.removeNodes("temp");
-        graph.removeLinks("temp");
-        for (var k in ret.nodes) {
-            var n = ret.nodes[k];
-            graph.addNode(n.id, n.type, n.state);
-        }
-        for (var k in ret.links) {
-            var l = ret.links[k];
-            graph.addLink(l.sourceId, l.targetId, l.name, l.state, ret.drop_conjugator_links);
+        window.ret = ret;
+        var comp = graph.compareSubset('temp', ret.nodes.filter(
+            function(node) {
+                return !graph.hasNode(node.id, "perm");
+            }).map(function (node) {
+                return node.id;
+            }), ret.links.map(
+            function (link) {
+                return [link.sourceId.toLowerCase(), link.targetId.toLowerCase()];
+            }
+        ));
+        var k, n;
+        if (comp.graph_same && !finalize) {
+            if (comp.old_id && comp.new_id) {
+                graph.editName(comp.old_id, null, comp.new_id);
+            }
+        } else {
+            //REINITIALISE GRAPH (DUMB BUT IT WORKS)
+            graph.removeNodes("temp");
+            graph.removeLinks("temp");
+            for (k in ret.nodes) {
+                n = ret.nodes[k];
+                graph.addNode(n.id, n.type, n.state);
+            }
+            for (k in ret.links) {
+                var l = ret.links[k];
+                graph.addLink(l.sourceId, l.targetId, l.name, l.state, ret.drop_conjugator_links);
+            }
         }
         //UPDATE GRAPH ONCE
-        graph.update();
+        graph.update(!finalize && comp.graph_same);
     }
 
     return ret;