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npmLogInterpreter.ts
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npmLogInterpreter.ts
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/*
* Copyright © 2019 Atomist, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { logger } from "@atomist/automation-client";
import { InterpretLog } from "@atomist/sdm";
import stripAnsi from "strip-ansi";
export const NpmLogInterpreter: InterpretLog = log => {
if (!log) {
return undefined;
}
const lines = removeBlanksFromEnd(
removeNpmFooter(
log.split("\n")
.map(stripAnsi)
.map(stripLogPrefix)));
const defaultMessage = lastOccurrenceOf(/^ERROR:/, lines) || "Error";
const defaultLines = lines.slice(-15);
const recognizedInterpretation: RecognizedLog =
recognizeMochaTest(lines) ||
recognizeNpmRunError(lines) ||
{};
const relevantLines: string[] = recognizedInterpretation.relevantLines || defaultLines;
return {
message: recognizedInterpretation.message || defaultMessage,
relevantPart: "```\n" + relevantLines.join("\n") + "\n```",
};
};
const LogPrefix = /^.*\[(info |error|warn |debug)\] /;
const NpmFooterPrefix = /^npm ERR!/;
const StackTraceLine = /^\W*at /;
const BeginMochaFailingTests = /^\W*\d* failing$/;
interface RecognizedLog {
message?: string;
relevantLines?: string[];
}
function recognizeNpmRunError(lines: string[]): RecognizedLog {
const reversedLines = lines.slice().reverse();
const lastBreakBeforeCommand = findTwoBlankLinesIndex(reversedLines);
if (lastBreakBeforeCommand < 0) {
return undefined;
}
return { relevantLines: lines.slice(-Math.min(lastBreakBeforeCommand, 20)) };
}
function recognizeMochaTest(lines: string[]): RecognizedLog | undefined {
const begin = lines.findIndex(s => BeginMochaFailingTests.test(s));
if (begin < 0) {
logger.debug("No mocha test detected");
return undefined;
}
logger.debug("Mocha test detected, beginning at %d: %s", begin, lines[begin]);
const fromBeginning = lines.slice(begin);
const end = findTwoBlankLinesIndex(fromBeginning) || fromBeginning.length;
const fromFailingCountToTwoBlankLines = fromBeginning.slice(0, end);
return {
message: "Tests: " + lines[begin].trim(),
relevantLines: fromFailingCountToTwoBlankLines.filter(s => !StackTraceLine.test(s)),
};
}
function stripLogPrefix(line: string): string {
return line.replace(LogPrefix, "");
}
function removeNpmFooter(lines: string[]): string[] {
const npmErr = "npm ERR! This is probably not a problem with npm. There is likely additional logging output above.";
if (lines.includes(npmErr)) {
logger.info("Filtering npm error footer");
return lines.filter(s => !NpmFooterPrefix.test(s));
}
return lines;
}
function findTwoBlankLinesIndex(lines: string[]): number {
return lines.findIndex((s, i) => s === "" && lines[i + 1] === "");
}
function lastOccurrenceOf(re: RegExp, lines: string[]): string {
const reversedLines = lines.slice().reverse(); // is there a better way tto make a copy? reverse() is in-place. >:-(
return reversedLines.find(s => re.test(s));
}
function removeBlanksFromEnd(lines: string[]): string[] {
let w = lines.length - 1;
while (lines[w].trim() === "") {
w--;
}
return lines.slice(0, w + 1);
}