69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
'use strict';
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var pipeline = require('streamx').pipeline;
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var fo = require('../../file-operations');
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var getCodec = require('../../codecs');
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var DEFAULT_ENCODING = require('../../constants').DEFAULT_ENCODING;
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var readStream = require('../../src/read-contents/read-stream');
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function writeStream(file, optResolver, onWritten) {
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var flags = fo.getFlags({
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overwrite: optResolver.resolve('overwrite', file),
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append: optResolver.resolve('append', file),
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});
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var encoding = optResolver.resolve('encoding', file);
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var codec = getCodec(encoding);
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if (encoding && !codec) {
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return onWritten(new Error('Unsupported encoding: ' + encoding));
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}
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var opt = {
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mode: file.stat.mode,
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// TODO: need to test this
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flags: flags,
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};
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// TODO: is this the best API?
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var outStream = fo.createWriteStream(file.path, opt, onFlush);
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// TODO: should this use a clone?
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var streams = [file.contents];
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if (encoding && encoding.enc !== DEFAULT_ENCODING) {
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streams.push(getCodec(DEFAULT_ENCODING).decodeStream());
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streams.push(codec.encodeStream());
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}
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streams.push(outStream);
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pipeline(streams, onWritten);
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// Cleanup
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function onFlush(fd, callback) {
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// TODO: this is doing sync stuff & the callback seems unnecessary
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readStream(file, { resolve: resolve }, complete);
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function resolve(key) {
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if (key === 'encoding') {
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return encoding;
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}
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if (key === 'removeBOM') {
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return false;
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}
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throw new Error("Eek! stub resolver doesn't have " + key);
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}
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function complete() {
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if (typeof fd !== 'number') {
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return callback();
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}
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fo.updateMetadata(fd, file, callback);
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}
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}
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}
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module.exports = writeStream;
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