From eb28f9f5871a7bbee6882dcadde3da9d36bb8378 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 3 Nov 2005 10:01:09 +0000
Subject: [PATCH] From Eric Sokolowsky, added writeEnvironmentSettings to help
 report what OSG centric environment variables are used.

---
 include/osg/ApplicationUsage |  2 ++
 src/osg/ApplicationUsage.cpp | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/osg/ApplicationUsage b/include/osg/ApplicationUsage
index 0764c236d..641d9b1eb 100644
--- a/include/osg/ApplicationUsage
+++ b/include/osg/ApplicationUsage
@@ -84,6 +84,8 @@ class OSG_EXPORT ApplicationUsage
         
         void write(std::ostream& output,unsigned int type=COMMAND_LINE_OPTION, unsigned int widthOfOutput=80,bool showDefaults=false);
 
+        void writeEnvironmentSettings(std::ostream& output);
+
     protected:
     
         std::string _applicationName;
diff --git a/src/osg/ApplicationUsage.cpp b/src/osg/ApplicationUsage.cpp
index 86a75a5ae..44d12a1ed 100644
--- a/src/osg/ApplicationUsage.cpp
+++ b/src/osg/ApplicationUsage.cpp
@@ -209,3 +209,39 @@ void ApplicationUsage::write(std::ostream& output, unsigned int type, unsigned i
 
 }
 
+
+void ApplicationUsage::writeEnvironmentSettings(std::ostream& output)
+{
+    output << "Current Environment Settings:"<<std::endl;
+
+    unsigned int maxNumCharsInOptions = 0;
+    ApplicationUsage::UsageMap::const_iterator citr;
+    for(citr=getEnvironmentalVariables().begin();
+        citr!=getEnvironmentalVariables().end();
+        ++citr)
+    {
+        std::string::size_type len = citr->first.find_first_of("\n\r\t ");
+        if (len == std::string::npos) len = citr->first.size();
+        maxNumCharsInOptions = maximum(maxNumCharsInOptions,len);
+    }
+    
+    unsigned int optionPos = 2;
+    std::string line;
+    
+    for(citr=getEnvironmentalVariables().begin();
+        citr!=getEnvironmentalVariables().end();
+        ++citr)
+    {
+        line.assign(optionPos+maxNumCharsInOptions+2,' ');
+        std::string::size_type len = citr->first.find_first_of("\n\r\t ");
+        if (len == std::string::npos) len = citr->first.size();
+        line.replace(optionPos,len,citr->first.substr(0,len));
+        char *cp = getenv(citr->first.substr(0, len).c_str());
+        if (!cp) cp = "[not set]";
+        else if (!*cp) cp = "[set]";
+        line += std::string(cp) + "\n";
+
+        output << line;
+    }
+    output << std::endl;
+}