getopts.fish

Adheres to POSIX Utility Syntax Guidelines, ensuring consistent and standard parsing behavior across utilities, as demonstrated in the parsing rules for short and long options.

Eliminates the domain-specific language and implicit variables of argparse, making scripts easier to read and debug, as shown in the straightforward quickstart example with a switch statement.

Supports clustering of short options, non-alphabetic characters, and long options with key-value pairs, handling complex cases like -ab1 or --warp=10 from the README examples.

Outputs key-value records that can be easily read into variables using a while read loop, simplifying argument processing and reducing boilerplate code in Fish scripts.