Add license info command "license()"

src/net/apocalypselabs/symat/Functions.java

@@ -45,10 +45,20 @@
  */
 package net.apocalypselabs.symat;
 
+import java.io.BufferedReader;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import static java.lang.Math.*;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Calendar;
+import java.util.Date;
 import java.util.HashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.swing.JOptionPane;
+import static net.apocalypselabs.symat.MainGUI.API_URL;
 import org.matheclipse.core.eval.EvalUtilities;
 import org.matheclipse.core.interfaces.IExpr;
 import org.matheclipse.parser.client.math.MathException;
@@ -109,11 +119,11 @@ public class Functions {
     }
 
     public String simplify(String expr) {
-        return sym("Simplify("+expr+")");
+        return sym("Simplify(" + expr + ")");
     }
 
     public Object vpa(String expr) {
-        IExpr ans = util.evaluate("N("+expr+")");
+        IExpr ans = util.evaluate("N(" + expr + ")");
         if (ans.isNumber()) {
             return Double.parseDouble(ans.toString());
         }
@@ -232,7 +242,6 @@ public class Functions {
         return FileUtils.MD5(data);
     }
 
-    
     // TODO: Make globals work!
 //    /*
 //     Global variables are accessible across scripts.
@@ -311,6 +320,44 @@ public class Functions {
         }
     }
 
+    public String license() {
+        String expires = "Error";
+        if (PrefStorage.getSetting("licensetype").equals("demo")) {
+            Calendar c = Calendar.getInstance();
+            c.setTime(new Date());
+            try {
+                long expire = Long.parseLong(PrefStorage.getSetting("license"));
+                long days = (((expire - c.getTimeInMillis())/(60*60*24))-999)/1000;
+                if (days < 0) {
+                    if (days == -1) {
+                        expires = "Today";
+                    } else {
+                        expires = abs(days)+" days ago";
+                    }
+                } else {
+                    expires = "In "+days+" days";
+                }
+            } catch (NumberFormatException e) {
+            }
+        } else {
+            try {
+                URL url = new URL(API_URL + "expire.php?email=" + PrefStorage.getSetting("license"));
+                try (InputStream is = url.openStream();
+                        BufferedReader br
+                        = new BufferedReader(new InputStreamReader(is))) {
+                    expires = br.readLine();
+                } catch (IOException ex) {
+                }
+            } catch (Exception ex) {
+            }
+        }
+        String lic = "==License Information==\n"
+                + "License: " + PrefStorage.getSetting("license")
+                + "\nType: " + PrefStorage.getSetting("licensetype")
+                + "\nExpires: " + expires;
+        return lic;
+    }
+
     /**
      * Make sure the graph window shows.
      */