Bug 1571711 - can't detect dot version on MacOS-X

src/net/sourceforge/schemaspy/util/Dot.java

@@ -10,16 +10,26 @@ public class Dot {
     private final Version badVersion = new Version("2.4");
 
     private Dot() {
-        String tempVersion = null;
+        String found = null;
         try {
+            // dot -V should return something similar to:
+            //  dot version 2.8 (Fri Feb  3 22:38:53 UTC 2006)
+            // or sometimes something like:
+            //  dot - Graphviz version 2.9.20061004.0440 (Wed Oct 4 21:01:52 GMT 2006)
             String dotCommand = "dot -V";
             Process process = Runtime.getRuntime().exec(dotCommand);
             BufferedReader reader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
             String versionLine = reader.readLine();
             StringTokenizer tokenizer = new StringTokenizer(versionLine);
             if (tokenizer.nextToken().equals("dot")) {  // skip 'dot'
-                tokenizer.nextToken();                  // skip 'version'
-                tempVersion = tokenizer.nextToken();    // x.x.x
+                // search for numeric portion of dot's output
+                while (found == null) {
+                    // Jean-François Veillette provides this logic:
+                    String token = tokenizer.nextToken(); // skip 'version'
+                    if (token.matches("[0-9.]*")) {
+                        found = token; // found numeric portion
+                    }
+                }
             } else {
                 System.err.println();
                 System.err.println("Invalid dot configuration detected.  '" + dotCommand + "' returned:");
@@ -28,7 +38,7 @@ private Dot() {
         } catch (Exception validDotDoesntExist) {
         }
 
-        version = new Version(tempVersion);
+        version = new Version(found);
     }
 
     public static Dot getInstance() {
@@ -116,9 +126,9 @@ public void writeMap(File dotFile, LineWriter out) throws DotFailure {
     }
 
     public class DotFailure extends IOException {
-		private static final long serialVersionUID = 3833743270181351987L;
+        private static final long serialVersionUID = 3833743270181351987L;
 
-		public DotFailure(String msg) {
+        public DotFailure(String msg) {
             super(msg);
         }
     }
@@ -162,4 +172,4 @@ public void run() {
             }
         }
     }
-}
+}