std::string environment_expand(std::string_view s) {
std::string r;
size_t start_pos = 0;
size_t dollar_pos;
while ((dollar_pos = s.find('$', start_pos)) != s.npos) {
r += s.substr(start_pos, dollar_pos - start_pos);
std::string varname;
if (dollar_pos + 1 < s.length() && s[dollar_pos + 1] == '{') {
size_t dollar_end = s.find('}', dollar_pos + 2);
if (dollar_end == s.npos) {
break;
}
varname = s.substr(dollar_pos + 2, dollar_end - (dollar_pos + 2));
start_pos = dollar_end + 1;
} else {
size_t dollar_end = s.find_first_not_of("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_"sv, dollar_pos + 1);
varname = s.substr(dollar_pos + 1, dollar_end - (dollar_pos + 1));
start_pos = dollar_end;
}
if (const char *varval = getenv (varname.c_str ())) {
r += varval;
}
}
if (start_pos < s.length()) {
r += s.substr(start_pos);
}
return r;
}
void replaceStringInPlace(std::string& subject, const std::string_view search, const std::string_view replace)
{
size_t pos = 0;
while ((pos = subject.find(search, pos)) != std::string::npos)
{
subject.replace(pos, search.length(), replace);
pos += replace.length();
}
}
inline bool ends_with( std::string_view input, std::string_view match ){
if( input.length() >= match.length() )
return input.substr( input.size() - match.length() ) == match;
return false;
}
size_t length() const {
return str.length();
}
inline bool starts_with( std::string_view input, std::string_view match ){
if( input.length() >= match.length() )
return input.substr( 0, match.length() ) == match;
return false;
}