Added environment variables as a source of Qpid configuration.

Option "foo-bar" will be read from env. QPID_FOO_BAR if
not specified on command line.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@532491 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 20 insertions, 0 deletions

diff --git a/cpp/src/qpid/CommonOptions.cpp b/cpp/src/qpid/CommonOptions.cpp
index 8efb3a6baa..d4db3660bd 100644
--- a/cpp/src/qpid/CommonOptions.cpp
+++ b/cpp/src/qpid/CommonOptions.cpp
@@ -17,9 +17,29 @@
  */
 
 #include "CommonOptions.h"
+#include <algorithm>
 
 namespace qpid {
 
+namespace program_options {
+
+char env2optchar(char env) {
+    return (env=='_') ? '-' : tolower(env);
+}
+    
+const std::string envPrefix("QPID_");
+
+std::string env2option(const std::string& env) {
+    if (env.find(envPrefix) ==0) {
+        std::string opt = env.substr(envPrefix.size());
+        std::transform(opt.begin(), opt.end(), opt.begin(), env2optchar);
+        return opt;
+    }
+    return std::string();
+} 
+
+} // namespace program_options
+
 const int CommonOptions::DEFAULT_PORT=5672;
 
 CommonOptions::CommonOptions() : trace(false), port(DEFAULT_PORT) {}