All files / lib/helpers DFHelper.js

98% Statements 49/50
90% Branches 18/20
77.78% Functions 7/9
98% Lines 49/50
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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