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node-spearhead/lib/common.js
2015-08-25 20:27:46 -04:00

158 lines
3.9 KiB
JavaScript
Executable File

#!/usr/bin/env node
/**
* Copyright (c) 2015 Joyent Inc. All rights reserved.
*/
var assert = require('assert-plus');
var sprintf = require('extsprintf').sprintf;
var util = require('util'),
format = util.format;
var errors = require('./errors'),
InternalError = errors.InternalError;
// ---- globals
var p = console.log;
// ---- support stuff
function objCopy(obj, target) {
if (target === undefined) {
target = {};
}
Object.keys(obj).forEach(function (k) {
target[k] = obj[k];
});
return target;
}
function deepObjCopy(obj) {
return JSON.parse(JSON.stringify(obj));
}
function zeroPad(n, width) {
var s = String(n);
while (s.length < width) {
s = '0' + s;
}
return s;
}
/**
* Convert a boolean or string representation into a boolean, or
* raise TypeError trying.
*
* @param value {Boolean|String} The input value to convert.
* @param default_ {Boolean} The default value is `value` is undefined.
* @param errName {String} The variable name to quote in the possibly
* raised TypeError.
*/
function boolFromString(value, default_, errName) {
if (value === undefined) {
return default_;
} else if (value === 'false' || value === '0') {
return false;
} else if (value === 'true' || value === '1') {
return true;
} else if (typeof (value) === 'boolean') {
return value;
} else {
throw new TypeError(
format('invalid value for "%s": %j', errName, value));
}
}
/**
* given an array return a string with each element
* JSON-stringifed separated by newlines
*/
function jsonStream(arr) {
return arr.map(function (elem) {
return JSON.stringify(elem);
}).join('\n');
}
/**
* given an array of key=value pairs, break them into an object
*
* @param {Array} kvs - an array of key=value pairs
* @param {Array} valid (optional) - an array to validate pairs
*/
function kvToObj(kvs, valid) {
var o = {};
for (var i = 0; i < kvs.length; i++) {
var kv = kvs[i];
var idx = kv.indexOf('=');
if (idx === -1)
throw new errors.UsageError(format(
'invalid filter: "%s" (must be of the form "field=value")',
kv));
var k = kv.slice(0, idx);
var v = kv.slice(idx + 1);
if (valid.indexOf(k) === -1)
throw new errors.UsageError(format(
'invalid filter name: "%s" (must be one of "%s")',
k, valid.join('", "')));
o[k] = v;
}
return o;
}
/**
* return how long ago something happened
*
* @param {Date} when - a date object in the past
* @param {Date} now (optional) - a date object to compare to
* @return {String} - printable string
*/
function longAgo(when, now) {
now = now || new Date();
var seconds = Math.round((now - when) / 1000);
var times = [
seconds / 60 / 60 / 24 / 365, // years
seconds / 60 / 60 / 24 / 30, // months
seconds / 60 / 60 / 24, // days
seconds / 60 / 60, // hours
seconds / 60, // minutes
seconds // seconds
];
var names = ['y', 'mon', 'd', 'h', 'min', 's'];
for (var i = 0; i < names.length; i++) {
var time = Math.floor(times[i]);
if (time > 0)
return util.format('%d%s', time, names[i]);
}
return '0s';
}
/**
* checks a string and returns a boolean based on if it
* is a UUID or not
*/
function isUUID(s) {
return /^([a-f\d]{8}(-[a-f\d]{4}){3}-[a-f\d]{12}?)$/i.test(s);
}
//---- exports
module.exports = {
objCopy: objCopy,
deepObjCopy: deepObjCopy,
zeroPad: zeroPad,
boolFromString: boolFromString,
jsonStream: jsonStream,
kvToObj: kvToObj,
longAgo: longAgo,
isUUID: isUUID,
};
// vim: set softtabstop=4 shiftwidth=4: