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6 | 'use strict'
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7 |
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8 | const fs = require('fs')
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9 | const co = require('co')
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10 |
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11 |
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12 | function _hasDuplicate (filename, content) {
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13 | return co(function * () {
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14 | let exists = yield new Promise((resolve) =>
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15 | fs.exists(filename, (exists) => resolve(exists))
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16 | )
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17 | if (!exists) {
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18 | return false
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19 | }
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20 | let existing = yield new Promise((resolve, reject) =>
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21 | fs.readFile(filename, (err, content) =>
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22 | err ? reject(err) : resolve(content)
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23 | )
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24 | )
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25 | return String(existing) === String(content)
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26 | })
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27 | }
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28 |
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29 | module.exports = _hasDuplicate
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