argp: GNU-style command line argument parser for Go

GNU command line argument parser Command line argument parser following the GNU standard. ./test -vo out.png --size 256 input.txt with the following features: build-in help ( -h and --help ) message and ) message scan arguments into struct fields with configuration in tags scan into composite field types (arrays, slices, structs) allow for nested sub commands GNU command line argument rules: arguments are options when they begin with a hyphen - multiple options can be combined: -abc is the same as -a -b -c is the same as long options start with two hyphens: --abc is one option is one option option names are alphanumeric characters options can have a value: -a 1 means that a has value 1 means that has value option values can be separated by a space, equal sign, or nothing: -a1 -a=1 -a 1 are all equal are all equal options and non-options can be interleaved the argument -- terminates all options so that all following arguments are treated as non-options terminates all op ... Read full article.