From: James Turner <zakalawe@mac.com>
Date: Thu, 24 Mar 2016 15:05:03 +0000 (+0000)
Subject: New options setting/clearing helpers.
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=88bfaca2b3d4034321ac786f06b074e5590735ee;p=flightgear.git

New options setting/clearing helpers.
---

diff --git a/src/Main/options.cxx b/src/Main/options.cxx
index bd1a91e07..6ae8d9a62 100644
--- a/src/Main/options.cxx
+++ b/src/Main/options.cxx
@@ -1769,6 +1769,22 @@ public:
     
     return it; // not found
   }
+
+    OptionValueVec::iterator findValue(const string& key)
+    {
+        OptionValueVec::iterator it = values.begin();
+        for (; it != values.end(); ++it) {
+            if (!it->desc) {
+                continue; // ignore markers
+            }
+
+            if (it->desc->option == key) {
+                return it;
+            }
+        } // of set values iteration
+        
+        return it; // not found
+    }
   
   OptionDesc* findOption(const string& key) const
   {
@@ -2202,7 +2218,35 @@ int Options::addOption(const string &key, const string &value)
   p->values.push_back(OptionValue(desc, value));
   return FG_OPTIONS_OK;
 }
-  
+
+int Options::setOption(const string &key, const string &value)
+{
+    OptionDesc* desc = p->findOption(key);
+    if (!desc) {
+        flightgear::modalMessageBox("Unknown option", "Unknown command-line option: " + key);
+        return FG_OPTIONS_ERROR;
+    }
+
+    if (!(desc->type & OPTION_MULTI)) {
+        OptionValueVec::const_iterator it = p->findValue(key);
+        if (it != p->values.end()) {
+            // remove existing valye
+            p->values.erase(it);
+        }
+    }
+    
+    p->values.push_back(OptionValue(desc, value));
+    return FG_OPTIONS_OK;
+}
+
+void Options::clearOption(const std::string& key)
+{
+    OptionValueVec::iterator it = p->findValue(key);
+    for (; it != p->values.end(); it = p->findValue(key)) {
+        p->values.erase(it);
+    }
+}
+
 bool Options::isOptionSet(const string &key) const
 {
   OptionValueVec::const_iterator it = p->findValue(key);
diff --git a/src/Main/options.hxx b/src/Main/options.hxx
index f6f23b0d4..4f618213b 100644
--- a/src/Main/options.hxx
+++ b/src/Main/options.hxx
@@ -101,7 +101,14 @@ public:
     * This can be used to inject option values, eg based upon environment variables
     */
   int addOption(const std::string& key, const std::string& value);
-  
+
+  /**
+   * set an option, overwriting any existing value which might be set
+   */
+  int setOption(const std::string& key, const std::string& value);
+
+  void clearOption(const std::string& key);
+
   /**
    * apply option values to the simulation state
    * (set properties, etc).