JarCastingargparse
CLI arguments parser for node.js, with sub-commands support. Port of python's argparse (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:
%rformat specifier usesrequire('util').inspect().
More details in doc.
Example
test.js file:
#!/usr/bin/env node
'use strict';
const { ArgumentParser } = require('argparse');
const { version } = require('./package.json');
// Formatter with support of `\n` in Help texts.
class HelpFormatter extends ArgumentParser.RawDescriptionHelpFormatter {
// executes parent _split_lines for each line of the help, then flattens the result
_split_lines(text, width) {
return [].concat(...text.split('\n').map(line => super._split_lines(line, width)));
}
}
const parser = new ArgumentParser({
description: 'Argparse example',
add_help: true,
formatter_class: HelpFormatter
});
parser.add_argument('-v', '--version', { action: 'version', version });
parser.add_argument('-f', '--foo', { help: 'foo bar' });
parser.add_argument('-b', '--bar', { help: 'bar foo' });
parser.add_argument('--baz', { help: 'baz bar' });
console.dir(parser.parse_args());
Display help:
$ ./test.js -h
usage: test.js [-h] [-v] [-f FOO] [-b BAR] [--baz BAZ]
Argparse example
optional arguments:
-h, --help show this help message and exit
-v, --version show program's version number and exit
-f FOO, --foo FOO foo bar
-b BAR, --bar BAR bar foo
--baz BAZ baz bar
Parse arguments:
$ ./test.js -f=3 --bar=4 --baz 5
{ foo: '3', bar: '4', baz: '5' }
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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