add default and override handling for Cnf::FindVector

Automatically handle the override of list options via its parent value
which can even be a comma-separated list of values. It also adds an easy
way of providing a default for the list.

1 files changed, 15 insertions, 1 deletions

diff --git a/apt-pkg/contrib/configuration.h b/apt-pkg/contrib/configuration.h
index 8e09ea0a6..c256139f4 100644
--- a/apt-pkg/contrib/configuration.h
+++ b/apt-pkg/contrib/configuration.h
@@ -74,8 +74,22 @@ class Configuration
    std::string Find(std::string const &Name, std::string const &Default) const {return Find(Name.c_str(),Default.c_str());};
    std::string FindFile(const char *Name,const char *Default = 0) const;
    std::string FindDir(const char *Name,const char *Default = 0) const;
+   /** return a list of child options
+    *
+    * Options like Acquire::Languages are handled as lists which
+    * can be overridden and have a default. For the later two a comma
+    * separated list of values is supported.
+    *
+    * \param Name of the parent node
+    * \param Default list of values separated by commas */
+   std::vector<std::string> FindVector(const char *Name, std::string const &Default) const;
+   std::vector<std::string> FindVector(std::string const &Name, std::string const &Default) const { return FindVector(Name.c_str(), Default); };
+#if (APT_PKG_MAJOR >= 4 && APT_PKG_MINOR >= 13)
+   std::vector<std::string> FindVector(const char *Name) const { return FindVector(Name, ""); };
+#else
    std::vector<std::string> FindVector(const char *Name) const;
-   std::vector<std::string> FindVector(std::string const &Name) const { return FindVector(Name.c_str()); };
+#endif
+   std::vector<std::string> FindVector(std::string const &Name) const { return FindVector(Name.c_str(), ""); };
    int FindI(const char *Name,int const &Default = 0) const;
    int FindI(std::string const &Name,int const &Default = 0) const {return FindI(Name.c_str(),Default);};
    bool FindB(const char *Name,bool const &Default = false) const;