@skylernpm/quos-porro-nesciunt
v1.0.0
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@skylernpm/quos-porro-nesciunt ========
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@skylernpm/quos-porro-nesciunt
CLI arguments parser for node.js, with sub-commands support. Port of python's @skylernpm/quos-porro-nesciunt (version 3.9.0).
Difference with original.
- JS has no keyword arguments support.
- Pass options instead:
new ArgumentParser({ description: 'example', add_help: true })
.
- Pass options instead:
- JS has no python's types
int
,float
, ...- Use string-typed names:
.add_argument('-b', { type: 'int', help: 'help' })
.
- Use string-typed names:
%r
format specifier usesrequire('util').inspect()
.
More details in doc.
Example
Following code is a JS program that takes a list of integers and produces either the sum or the max:
const { ArgumentParser } = require('@skylernpm/quos-porro-nesciunt')
const parser = new ArgumentParser({ description: 'Process some integers.' })
let sum = ints => ints.reduce((a, b) => a + b)
let max = ints => ints.reduce((a, b) => a > b ? a : b)
parser.add_argument('integers', { metavar: 'N', type: 'int', nargs: '+',
help: 'an integer for the accumulator' })
parser.add_argument('--sum', { dest: 'accumulate', action: 'store_const',
const: sum, default: max,
help: 'sum the integers (default: find the max)' });
let args = parser.parse_args()
console.log(args.accumulate(args.integers))
Assuming the JS code above is saved into a file called prog.js, it can be run at the command line and provides useful help messages:
$ node prog.js -h
usage: prog.js [-h] [--sum] N [N ...]
Process some integers.
positional arguments:
N an integer for the accumulator
optional arguments:
-h, --help show this help message and exit
--sum sum the integers (default: find the max)
When run with the appropriate arguments, it prints either the sum or the max of the command-line integers:
$ node prog.js 1 2 3 4
4
$ node prog.js 1 2 3 4 --sum
10
If invalid arguments are passed in, it will issue an error:
$ node prog.js a b c
usage: prog.js [-h] [--sum] N [N ...]
prog.js: error: argument N: invalid 'int' value: 'a'
This is an example ported from Python. You can find detailed explanation here.
API docs
Since this is a port with minimal divergence, there's no separate documentation. Use original one instead, with notes about difference.
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