argparse

An opinionated command line input parsing tool.

Partially an example for myself on variadic templates and how to call C++ code in C. Partially a way to parse cmd line inputs the way I like to pass in command line inputs.

Supported arguments

GNU-style multi-letter arguments

my_app --command

my_app --command 1

my_app --command 1.5

my_app --command 'something'

Single letter arguments

my_app -i

my_app -i 2

my_app -i 2.3

my_app -i 'something else'

Chained single letter arguments

my_app -i -c -u is equivalent to my_app -icu

my_app -a -b 5 -c 5 is equivalent to my_app -abc 5

This last behavior might be a bit contentious, as there is some sort of implicit sharing of input arguments (both b and c are accepting the input 5) while arguments that don't accept arguments will ignore this (like a above).

Default arguments

my_app command

Help command

--help will print a list of all known commands with description text.

Building

cmake -B build .
cmake --build build

If you don't want the example apps, change set(EXAMPLES TRUE) to set(EXAMPLES FALSE) in CMakeLists.txt.