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| 'use strict'
var _ = require('underscore')
function DFHelper() {}
_.extend(DFHelper, {
noop: function() {},
parse: function(stdout, options) {
Iif (!stdout) {
return void 0
}
var multiplier = DFHelper.getMultiplierByPrefix(options.prefixMultiplier)
var isDisplayPrefixMultiplier = !!options.isDisplayPrefixMultiplier
var displayedPrefixMultiplier = isDisplayPrefixMultiplier ? options.prefixMultiplier : null
var precision = options.precision
var format = DFHelper.format
var response = _(
stdout
.trim()
// split into rows
.split(/\r|\n|\r\n/)
// strip column headers away
.slice(1)
).map(function(row) {
var columns = row
// one or more whitespaces followed by one or more digits
// must be interpreted as column delimiter
.replace(/\s+(\d+)/g, '\t$1')
// one or more whitespaces followed by a slash
// must be interpreted as the last column delimiter
.replace(/\s+\//g, '\t/')
// split into columns
.split(/\t/)
var filesystem = columns[0]
var size = format(columns[1], multiplier, precision, displayedPrefixMultiplier)
var used = format(columns[2], multiplier, precision, displayedPrefixMultiplier)
var available = format(columns[3], multiplier, precision, displayedPrefixMultiplier)
var capacity = format(columns[4], 0.01)
var mount = _.rest(columns, 5).join(' ')
return {
filesystem: filesystem,
size: size,
used: used,
available: available,
capacity: capacity,
mount: mount,
}
})
return response
},
format: function(s, multiplier, precision, displayedPrefixMultiplier) {
multiplier = multiplier || 1
var tmp = parseInt(s, 10) * multiplier
var amount = Math.pow(10, precision)
var hasPrecision = _.isNumber(precision)
if (hasPrecision) {
tmp = Math.round(tmp * amount) / amount
}
if (displayedPrefixMultiplier) {
if (hasPrecision) {
tmp = tmp.toFixed(precision)
}
tmp = tmp + displayedPrefixMultiplier
}
return tmp
},
getMultiplierByPrefix: function(prefix) {
var prefixMultipliers = DFHelper.getPrefixMultipliers()
var defaultPrefix = 'KiB'
var defaultMultiplier = 1024
var multiplier = 1
// prefixes are case insensitive
prefix = (prefix || defaultPrefix).toLowerCase()
// invalid prefix multipliers are ignored
if (!prefixMultipliers[prefix]) {
prefix = defaultPrefix
}
// df outputs sizes in KiB
// nothing to do
if (prefix === defaultPrefix) {
return multiplier
}
// convert to bytes then convert to unit of choice
multiplier = defaultMultiplier / prefixMultipliers[prefix]
return multiplier
},
getPrefixMultipliers: function() {
if (DFHelper._prefixMultipliers) {
return DFHelper._prefixMultipliers
}
var pow2 = DFHelper._pow2
var pow10 = DFHelper._pow10
DFHelper._prefixMultipliers = {
kib: pow2(10),
mib: pow2(20),
gib: pow2(30),
tib: pow2(40),
pib: pow2(50),
eib: pow2(60),
zib: pow2(70),
yib: pow2(80),
kb: pow10(3),
mb: pow10(6),
gb: pow10(9),
tb: pow10(12),
pb: pow10(15),
eb: pow10(18),
zb: pow10(21),
yb: pow10(24),
}
return DFHelper._prefixMultipliers
},
_pow2: function(exponent) {
return Math.pow(2, exponent)
},
_pow10: function(exponent) {
return Math.pow(10, exponent)
},
_prefixMultipliers: null,
})
module.exports = DFHelper
|