argparsh - python argparse for the shell

Ever wanted to parse arguments in bash but felt frustrated by giant case blocks and unfriendly syntax? Ever tried getopts but ended up curled on the floor sobbing? Have you ever spent sleepless nights hoping that bash argument parsing could be as simple as python's argparse? Maybe argparsh is for you.

argparsh aims to provide an easy way to construct an argument parsing program from any shell.

Usage

# Create a parser that accepts a string and an optional int value
parser=$({
    # Initialize the parser with the name of the script and a description
    argparsh new $0 -d "Example parser"

    # Add a positional argument - note that args after -- are options to add_arg
    # and not aliases for the argument
    argparsh add_arg strarg -- --help "My string argument"

    # Add a keyword argument that can either be -i <value> or --intarg <value>
    argparsh add_arg -i --intarg -- \
        --help "My int argument" \
        --type int \
        --default 10
})

# Parse the input arguments with the parser above
eval $(argparsh parse $parser -- "$@")

# Access parsed arguments by name
echo "String argument was" $strarg
echo "Integer argument was" $intarg

See examples/example.sh for a complete example, and examples of alternate output formats (e.g. parsing CLI arguments into an associative array). The examples directory has a few other examples that show different ways to use argparsh in general.

Installation

cargo install argparsh

Or, to build from source:

git clone https://github.com/aneeshdurg/argparsh.git
cd argparsh
cargo install --path .

Similar Works

argparsh differs from previous attempts at improving shell argument parsing by being shell agnostic (although only bash is tested, it is relatively easy to add support for more shells, contributions are welcome), supporting subcommands/subparsers, and allowing detailed + customizable help text to be configured.

• getopts
  • the OG argument handling utility. A bit clunky to use.
• argparse.sh
  • similar approach, but not completely shell agnostic, and lacking in more advanced features, like subcommands.
• fish argparse
  • Fish specific, but a nice utility. Not easy to use outside of fish and no subcommand support.