Options and input processing for Fortran

options.f90 is a Fortran module for defining and parsing command-line options and input parameters for Fortran programs. Its design is inspired by Python's optparse module. Some features:

• Allows definition of options/parameters (real, integer, logical, string, and flags) corresponding to natural Fortran types, with names and descriptions

• Automates reading option values from the command line and input parameters from file

• Supports long options (e.g. --myopt) and short options (-m), as well as combining several short options (e.g. -v -c is the same as -vc)

• Performs rigorous input validation & other error checking

• Supports default values for all option types, and lower & upper bounds on numerical options

• Can print nice descriptions of available options, with line wrapping as necessary

• Designed to be easily extended with new option types

• Well-tested and carefully coded (much of the code has been formally verified)

• Easy to use

For more info, see http://infty.net/options/options.html

To Do

Some goals for future versions of this library:

1. Include support for commands, rather than just options, on the command line.

2. Create a mechanism for automatically generating a help message, given a short description of the program.