Handle messy python directories

Author: hinerm

src/main/java/org/scijava/plugins/scripting/python/OptionsPython.java

@@ -118,7 +118,26 @@ public boolean isPythonMode(){
  }
 
 publicvoidsetPythonDir(finalFilepythonDir){
-this.pythonDir = pythonDir;
+if (pythonDir == null){
+this.pythonDir = null;
+ } else{
+// Trim whitespace and remove illegal characters from the path
+Stringpath = pythonDir.getPath();
+if (path != null){
+// Remove leading/trailing whitespace and angle brackets
+path = path.trim().replaceAll("^[\\s<>]+|[\\s<>]+$", "");
+// Remove illegal characters for Windows paths except : after drive letter
+// Remove all colons except at index 1 (C:)
+if (path.length() > 2 && path.charAt(1) == ':'){
+path = path.substring(0, 2) + path.substring(2).replace(":", "");
+ } else{
+path = path.replace(":", "");
+ }
+// Remove any other illegal characters (keep it simple)
+path = path.replaceAll("[\n\r\t]", "");
+ }
+this.pythonDir = newFile(path);
+ }
  }
 
 publicvoidsetPythonMode(finalbooleanpythonMode){
@@ -257,6 +276,7 @@ private File getEnvironmentYamlFile(){
 
 @Override
 publicvoidsave(){
+setPythonDir(pythonDir); // clean up the path
 // Write python-dir and launch-mode values to app config file.
 finalStringconfigFileProp = System.getProperty("scijava.app.config-file");
 if (configFileProp == null) return; // No config file to update.