object to parse commandline-args and options.
npm install argparserargparser
==================
[Node.js] Parses command line args and options.
OR
npm install argparser
a command
node script.js -r --num 100 file1.txt 11
in script.js
var ap = require('argparser')
.files(0)
.nums(1, "num")
.nonvals('r')
.parse();
var file = ap.arg(0) // "file1.txt"
var n = ap.arg(1) // 11
var num = ap.opt("num") // 100
var r = ap.opt("r") // true
var ap = ArgParser.create().parse();
This can be omitted using shortcut methods.
Returns an instance of ArgParser.
a command
node script.js --seq ACTG -n 1
in script.js
var ap = require('argparser')
.vals("n", "seq")
.parse();
var n = ap.opt("n") // "1"
var seq = ap.opt("seq") // "ACTG"
"--" is used for long option name (more than one characters).
"-" is used for short option name (just one character).
node script.js --long long -s short
Returns this.
a command
node script.js -t --no-save
in script.js
var ap = require('argparser')
.nonvals("t", "no-save")
.parse();
var t = ap.opt("t") // true
var nosave = ap.opt("no-save") // true
"--" is used for long option name (more than one characters).
"-" is used for short option name (just one character).
node script.js --long -s
Returns this.
These values are checked in ap.parse().
If there is an invalid filename, an exception is thrown.
a command
node script.js --txt foo.txt bar.txt
in script.js
var ap = require('argparser')
.files("txt", 0)
.parse();
var txt = ap.opt("txt") // "foo.txt"
var nosave = ap.arg(0) // "bar.txt"
"0" in the example means the first argument.
"1" will be the second, and so on.
We don't need to call ap.vals() to the option name used in ap.files().
Returns this.
The same specs as ap.files().
Returns this.
If isNaN, an exception is thrown.
a command
node script.js -n 11 bar.txt 300
in script.js
var ap = require('argparser')
.files(0)
.nums("n", 1)
.parse();
var file = ap.arg(0) // "bar.txt"
var n = ap.opt("n") // 11
console.log(typeof n) // "number"
var num = ap.arg(1) // 300
console.log(typeof num) // "number"
The same specs as ap.files().
Returns this.
a command
node script.js
in script.js
var ap = require('argparser')
.defaults({
n : 3,
file : "file1.txt"
})
.files("file")
.parse();
var n = ap.opt("n") // 3
var file = ap.opt("file") // "file1.txt"
If noSetNums is true, ap.nums() is not called to options
whose default value is number.
By default, ap.nums() are called to these options automatically.
The argument passed to fn is the thrown error.
Return value of the function is the return value of ap.parse().
By default, it returns false.
var ap = require('argparser')
.files(0)
.err(function(e) {
console.error(e.message)
console.error("[usage]\n\tnode", __filename, "
})
.parse();
if (!ap) process.exit();
ArgParser throws an error if min is larger than arguments.length.
ArgParser throws an error if max is smaller than arguments.length.
We can set just min like the following sample.
var ap = require('argparser')
.arglen(3) // three arguments are required
.parse();
arr is optional.
If arr is not set, parses process.argv (without process.argv[0] and process.argv[1]).
var ap = require('argparser').files(0, "f").parse(["-f", "file1.txt", "file2.txt"]);
var f = ap.opt("f"); // "file1.txt"
var f2 = ap.arg(0); // "file2.txt"
a command
node script.js arg1 arg2 --opt arg3 --valopt optval
in script.js
var ap = require('argparser')
.vals("valopt")
.nonvals("opt")
.parse();
var a1 = ap.arg(0); // arg1
var a2 = ap.arg(1); // arg2
var a3 = ap.arg(2); // arg3
var a4 = ap.arg(3); // undefined
a command
node script.js -o --valopt optval arg1 --aaa
in script.js
var ap = require('argparser')
.vals("valopt", "v2")
.nonvals("o", "opt")
.parse();
When registered vals options are passed, returns the value.
var o1 = ap.opt("valopt"); // "optval"
When registered nonvals options are passed, returns true.
var o2 = ap.opt("o"); // true
When registered options are not passed, returns ap.emptyValue.
console.log(ap.emptyValue) // false
var o3 = ap.opt("opt"); // false
var o4 = ap.opt("v2"); // false
ap.emptyValue is writable.
If multiple arguments are passed, the first matched value is returned.
var o3 = ap.opt("opt", "o"); // true
var o4 = ap.opt("valopt", "v2); // "optval"
When not a registered option is passed, it is parsed as an invalid nonval option.
var o5 = ap.opt("aaa"); // true
var o6 = ap.invalids(); // ["aaa"]
var o7 = ap.opt("eee"); // undefined
ap.emptyValue = null
a command
node script.js -a --bcd
in script.js
var ap = require('argparser').parse();
var list = ap.invalid();
console.log(list); // "a", "bcd"
a command
node script.js -a 1 arg1 -t --invalid_opt --bcd file.txt arg2 arg3
in script.js
var ap = require('argparser')
.vals("a", "bcd")
.nonvals("t")
.parse();
console.log(ap.stringify()); // -t -a 1 --bcd file.txt arg1 arg2 arg3
Note that invalid options are removed.
- ArgParser.vals()
- ArgParser.nonvals()
- ArgParser.files()
- ArgParser.dirs()
- ArgParser.nums()
- ArgParser.defaults()
- ArgParser.parse()
ArgParser.vals("a")
is completely equivalent to
ArgParser.create().vals("a")
Copyright (c) 2011-2012 SHIN Suzuki
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'Software'), to deal in the Software without restriction, including
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permit persons to whom the Software is furnished to do so, subject to
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included in all copies or substantial portions of the Software.
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