87 lines
3.0 KiB
JavaScript
87 lines
3.0 KiB
JavaScript
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/*
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* MIT License http://opensource.org/licenses/MIT
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* Author: Ben Holloway @bholloway
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*/
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'use strict';
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const path = require('path');
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const PACKAGE_NAME = require('../../package.json').name;
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/**
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* Paths are formatted to have posix style path separators and those within the CWD are made relative to CWD.
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*
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* @param {string} absolutePath An absolute path to format
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* @returns {string} the formatted path
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*/
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const pathToString = (absolutePath) => {
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if (absolutePath === '') {
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return '-empty-';
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} else {
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const relative = path.relative(process.cwd(), absolutePath).split(path.sep);
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const segments =
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(relative[0] !== '..') ? ['.'].concat(relative).filter(Boolean) :
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(relative.lastIndexOf('..') < 2) ? relative :
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absolutePath.split(path.sep);
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return segments.join('/');
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}
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};
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exports.pathToString = pathToString;
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/**
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* Format a debug message.
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*
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* @param {string} filename The file being processed by webpack
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* @param {string} uri A uri path, relative or absolute
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* @param {Array<{base:string,joined:string,isSuccess:boolean}>} attempts An array of attempts, possibly empty
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* @return {string} Formatted message
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*/
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const formatJoinMessage = (filename, uri, attempts) => {
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const attemptToCells = (_, i, array) => {
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const { base: prev } = (i === 0) ? {} : array[i-1];
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const { base: curr, joined } = array[i];
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return [(curr === prev) ? '' : pathToString(curr), pathToString(joined)];
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};
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const formatCells = (lines) => {
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const maxWidth = lines.reduce((max, [cellA]) => Math.max(max, cellA.length), 0);
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return lines.map(([cellA, cellB]) => [cellA.padEnd(maxWidth), cellB]).map((cells) => cells.join(' --> '));
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};
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return [PACKAGE_NAME + ': ' + pathToString(filename) + ': ' + uri]
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.concat(attempts.length === 0 ? '-empty-' : formatCells(attempts.map(attemptToCells)))
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.concat(attempts.some(({ isSuccess }) => isSuccess) ? 'FOUND' : 'NOT FOUND')
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.join('\n ');
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};
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exports.formatJoinMessage = formatJoinMessage;
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/**
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* A factory for a log function predicated on the given debug parameter.
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*
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* The logging function created accepts a function that formats a message and parameters that the function utilises.
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* Presuming the message function may be expensive we only call it if logging is enabled.
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*
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* The log messages are de-duplicated based on the parameters, so it is assumed they are simple types that stringify
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* well.
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*
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* @param {function|boolean} debug A boolean or debug function
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* @return {function(function, array):void} A logging function possibly degenerate
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*/
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const createDebugLogger = (debug) => {
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const log = !!debug && ((typeof debug === 'function') ? debug : console.log);
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const cache = {};
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return log ?
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((msgFn, params) => {
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const key = Function.prototype.toString.call(msgFn) + JSON.stringify(params);
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if (!cache[key]) {
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cache[key] = true;
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log(msgFn.apply(null, params));
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}
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}) :
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(() => undefined);
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};
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exports.createDebugLogger = createDebugLogger;
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