laeeth / d-simpleconfig Goto Github PK

Library primarily intended to help quickly write small command-line tools. Parses command-line arguments and configuration file and stores result into provided D struct instance.

void main ()
{
    import simpleconfig;

    struct Config
    {
        @cli
        int value;
        @cli("flag|f") @cfg("flag")
        string anothervalue;
        @cfg("some ratio")
        double ratio;

        void finalizeConfig ()
        {

        }
    }

    Config config;
    readConfiguration(config);
}

This snippet will do the following:

• Check standard locations for the current platform for the config file named appname.cfg. If found, parse it and initialize config.anothervalue from flag entry and config.ration from some ratio entry.
• Iterate through command-line arguments. If --value argument is found, it will be written to config.value (using std.conv.to for conversion). If either --flag or -f arguments are found, it will be written to config.anothervalue.
• Call config.finalizeConfig if defined for a given struct.

If value is set both by config file and command-line argument, the latter takes priority.

Currently config file is named appname.cfg and uses simple key-value format:

key = value
another key = " value that starts with a whitespace"

The following locations are checked for config file presence:

1. Current working directory
2. Same folder as the executable
3. $XDG_CONFIG_HOME (Posix) or %LOCALAPPDATA% (Windows)