cowsay/cli.js

cowsay is a configurable talking cow

#!/usr/bin/env node
var argv = require("optimist")
.usage("Usage: $0 [-e eye_string] [-f cowfile] [-h] [-l] [-n] [-T tongue_string] [-W column] [-bdgpstwy] text\n\n" +
	"If any command-line arguments are left over after all switches have been processed, they become the cow's message.\n\n" +
	"If the program is invoked as cowthink then the cow will think its message instead of saying it.")
.options({
	"e" : {
		default : "oo"
	},
	"T" : {
		default : "  "
	},
	"W" : {
		default : 40
	},
	"f" : {
		default : "default"
	}
})
.describe({
	"b" : "Mode: Borg",
	"d" : "Mode: Dead",
	"g" : "Mode: Greedy",
	"p" : "Mode: Paranoia",
	"s" : "Mode: Stoned",
	"t" : "Mode: Tired",
	"w" : "Mode: Wired",
	"y" : "Mode: Youthful",
	"e" : "Select the appearance of the cow's eyes.",
	"T" : "The tongue is configurable similarly to the eyes through -T and tongue_string.",
	"h" : "Display this help message",
	"n" : "If it is specified, the given message will not be word-wrapped.",
	"W" : "Specifies roughly where the message should be wrapped. The default is equivalent to -W 40 i.e. wrap words at or before the 40th column.",
	"f" : "Specifies a cow picture file (''cowfile'') to use. It can be either a path to a cow file or the name of one of cows included in the package.",
	"r" : "Select a random cow",
	"l" : "List all cowfiles included in this package."
})
.boolean(["b", "d", "g", "p", "s", "t", "w", "y", "n", "h", "r", "l"])
.argv;

if (argv.l) {
	listCows();
} else if (argv.h) {
	showHelp();
} else if (argv._.length) {
	say();
} else {
	require("get-stdin")().then(function (data) {
		if (data) {
			argv._ = [require("strip-eof")(data)];
			say();
		} else {
			showHelp();
		}
	});
}

function say () {
	var module = require("./index");

	var think = /think$/.test(argv["$0"]);

	console.log(think ? module.think(argv) : module.say(argv));
}

function listCows () {
	require("./index").list(function(err, list) {
		if (err) throw new Error(err);
		console.log(list.join("  "));
	});
}

function showHelp () {
	require("optimist").showHelp();
}