58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
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'use strict';
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const fs = require('fs');
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const equalLength = require('equal-length');
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const codeExcerpt = require('code-excerpt');
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const truncate = require('cli-truncate');
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const chalk = require('chalk');
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const formatLineNumber = (lineNumber, maxLineNumber) =>
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' '.repeat(Math.max(0, String(maxLineNumber).length - String(lineNumber).length)) + lineNumber;
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module.exports = (source, options) => {
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if (!source.isWithinProject || source.isDependency) {
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return null;
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}
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const file = source.file;
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const line = source.line;
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options = options || {};
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const maxWidth = options.maxWidth || 80;
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let contents;
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try {
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contents = fs.readFileSync(file, 'utf8');
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} catch (err) {
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return null;
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}
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const excerpt = codeExcerpt(contents, line, {around: 1});
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if (!excerpt) {
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return null;
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}
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const lines = excerpt.map(item => ({
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line: item.line,
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value: truncate(item.value, maxWidth - String(line).length - 5)
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}));
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const joinedLines = lines.map(line => line.value).join('\n');
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const extendedLines = equalLength(joinedLines).split('\n');
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return lines
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.map((item, index) => ({
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line: item.line,
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value: extendedLines[index]
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}))
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.map(item => {
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const isErrorSource = item.line === line;
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const lineNumber = formatLineNumber(item.line, line) + ':';
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const coloredLineNumber = isErrorSource ? lineNumber : chalk.grey(lineNumber);
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const result = ` ${coloredLineNumber} ${item.value}`;
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return isErrorSource ? chalk.bgRed(result) : result;
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})
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.join('\n');
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};
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