1 | ;
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2 | /**
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3 | * @license
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4 | * Copyright Google LLC All Rights Reserved.
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5 | *
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6 | * Use of this source code is governed by an MIT-style license that can be
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7 | * found in the LICENSE file at https://angular.io/license
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8 | */
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9 | Object.defineProperty(exports, "__esModule", { value: true });
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10 | exports.createConsoleLogger = void 0;
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11 | const rxjs_1 = require("rxjs");
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12 | const src_1 = require("../src");
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13 | /**
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14 | * A Logger that sends information to STDOUT and STDERR.
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15 | */
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16 | function createConsoleLogger(verbose = false, stdout = process.stdout, stderr = process.stderr, colors) {
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17 | const logger = new src_1.logging.IndentLogger('cling');
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18 | logger.pipe((0, rxjs_1.filter)((entry) => entry.level !== 'debug' || verbose)).subscribe((entry) => {
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19 | const color = colors && colors[entry.level];
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20 | let output = stdout;
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21 | switch (entry.level) {
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22 | case 'warn':
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23 | case 'fatal':
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24 | case 'error':
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25 | output = stderr;
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26 | break;
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27 | }
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28 | // If we do console.log(message) or process.stdout.write(message + '\n'), the process might
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29 | // stop before the whole message is written and the stream is flushed. This happens when
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30 | // streams are asynchronous.
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31 | //
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32 | // NodeJS IO streams are different depending on platform and usage. In POSIX environment,
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33 | // for example, they're asynchronous when writing to a pipe, but synchronous when writing
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34 | // to a TTY. In windows, it's the other way around. You can verify which is which with
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35 | // stream.isTTY and platform, but this is not good enough.
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36 | // In the async case, one should wait for the callback before sending more data or
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37 | // continuing the process. In our case it would be rather hard to do (but not impossible).
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38 | //
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39 | // Instead we take the easy way out and simply chunk the message and call the write
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40 | // function while the buffer drain itself asynchronously. With a smaller chunk size than
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41 | // the buffer, we are mostly certain that it works. In this case, the chunk has been picked
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42 | // as half a page size (4096/2 = 2048), minus some bytes for the color formatting.
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43 | // On POSIX it seems the buffer is 2 pages (8192), but just to be sure (could be different
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44 | // by platform).
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45 | //
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46 | // For more details, see https://nodejs.org/api/process.html#process_a_note_on_process_i_o
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47 | const chunkSize = 2000; // Small chunk.
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48 | let message = entry.message;
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49 | while (message) {
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50 | const chunk = message.slice(0, chunkSize);
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51 | message = message.slice(chunkSize);
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52 | output.write(color ? color(chunk) : chunk);
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53 | }
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54 | output.write('\n');
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55 | });
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56 | return logger;
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57 | }
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58 | exports.createConsoleLogger = createConsoleLogger;
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59 | //# 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