00001 #include "utilmm/configfile/shell_expand.hh"
00002
00003 #include <boost/regex.hpp>
00004 #include <iterator>
00005 #include <sstream>
00006
00007 using namespace std;
00008 using boost::regex;
00009 using boost::smatch;
00010
00011
00012 #include <iostream>
00013
00014 string utilmm::shell_expand(string const& text)
00015 {
00016 static regex const
00017 rx_shellvalue("\\$(\\w+)");
00018
00019 smatch result;
00020 if (! regex_search(text, result, rx_shellvalue))
00021 return text;
00022
00023 string::const_iterator last_match;
00024 string::const_iterator const end = text.end();
00025
00026 ostringstream expanded;
00027 do
00028 {
00029 expanded << result.prefix();
00030
00031 std::string env_key = result[1];
00032 char const* env_value = getenv(env_key.c_str());
00033 if (env_value)
00034 expanded << env_value;
00035
00036 last_match = result.suffix().first;
00037 } while(regex_search(last_match, end, result, rx_shellvalue));
00038
00039 copy(last_match, end, ostream_iterator<string::value_type>(expanded));
00040 return expanded.str();
00041 }
00042
