Implemented XDG-compliant config file reading.

[stg.git] / projects / sgconf / options.cpp

diff --git a/projects/sgconf/options.cpp b/projects/sgconf/options.cpp
index a079e1b18f835467772b6c60e7e3e3dd89aefda2..6a4eef1b6952cb9849945afffc857d59b36ff90d 100644 (file)
--- a/projects/sgconf/options.cpp
+++ b/projects/sgconf/options.cpp
@@ -23,10 +23,47 @@
 #include "action.h"
 #include "parser_state.h"
 
+#include "stg/common.h"
+
+#include <fstream>
+#include <sstream>
 #include <iostream>
 #include <functional>
 #include <algorithm>
 
+#include <unistd.h>
+
+namespace
+{
+
+template <class C>
+void ReadConfigFile(const std::string & filePath, void (C::* callback)(const std::string&, const std::string&), C * obj)
+{
+std::ifstream stream(filePath.c_str());
+std::string line;
+size_t num = 0;
+while (std::getline(stream, line))
+    {
+    ++num;
+    line = Trim(line);
+    std::string::size_type pos = line.find_first_of('#');
+    if (pos != std::string::npos)
+        line = line.substr(0, pos);
+    if (line.empty())
+        continue;
+    pos = line.find_first_of('=');
+    if (pos == std::string::npos)
+        {
+        std::ostringstream error;
+        error << "Bad file format, missing '=' in '" << filePath << ":" << num << "'.";
+        throw std::runtime_error(error.str().c_str());
+        }
+    (obj->*callback)(Trim(line.substr(0, pos)), Trim(line.substr(pos + 1, line.length() - pos - 1)));
+    }
+}
+
+} // namespace anonymous
+
 using SGCONF::OPTION;
 using SGCONF::OPTION_BLOCK;
 using SGCONF::OPTION_BLOCKS;
@@ -119,6 +156,20 @@ catch (const ACTION::ERROR & ex)
     }
 }
 
+void OPTION::ParseValue(const std::string & value)
+{
+if (!m_action)
+    throw ERROR("Option is not defined.");
+try
+    {
+    return m_action->ParseValue(value);
+    }
+catch (const ACTION::ERROR & ex)
+    {
+    throw ERROR(m_longName + ": " + ex.what());
+    }
+}
+
 OPTION_BLOCK & OPTION_BLOCK::Add(const std::string & shortName,
                                  const std::string & longName,
                                  ACTION * action,
@@ -161,6 +212,20 @@ while (state.argc > 0 && !state.stop)
 return state;
 }
 
+void OPTION_BLOCK::ParseFile(const std::string & filePath)
+{
+if (access(filePath.c_str(), R_OK))
+    throw ERROR("File '" + filePath + "' does not exists.");
+ReadConfigFile(filePath, &OPTION_BLOCK::OptionCallback, this);
+}
+
+void OPTION_BLOCK::OptionCallback(const std::string & key, const std::string & value)
+{
+for (std::vector<OPTION>::iterator it = m_options.begin(); it != m_options.end(); ++it)
+    if (it->Name() == key)
+        it->ParseValue(value);
+}
+
 void OPTION_BLOCKS::Help(size_t level) const
 {
 std::list<OPTION_BLOCK>::const_iterator it(m_blocks.begin());