no-useless-path-segments.js
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'use strict';
var _path = require('path');
var _path2 = _interopRequireDefault(_path);
var _sumBy = require('lodash/sumBy');
var _sumBy2 = _interopRequireDefault(_sumBy);
var _resolve = require('eslint-module-utils/resolve');
var _resolve2 = _interopRequireDefault(_resolve);
var _moduleVisitor = require('eslint-module-utils/moduleVisitor');
var _moduleVisitor2 = _interopRequireDefault(_moduleVisitor);
var _docsUrl = require('../docsUrl');
var _docsUrl2 = _interopRequireDefault(_docsUrl);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
* convert a potentially relative path from node utils into a true
* relative path.
*
* ../ -> ..
* ./ -> .
* .foo/bar -> ./.foo/bar
* ..foo/bar -> ./..foo/bar
* foo/bar -> ./foo/bar
*
* @param rel {string} relative posix path potentially missing leading './'
* @returns {string} relative posix path that always starts with a ./
**/
function toRel(rel) {
const stripped = rel.replace(/\/$/g, '');
return (/^((\.\.)|(\.))($|\/)/.test(stripped) ? stripped : `./${stripped}`
);
} /**
* @fileOverview Ensures that there are no useless path segments
* @author Thomas Grainger
*/
function normalize(fn) {
return toRel(_path2.default.posix.normalize(fn));
}
const countRelParent = x => (0, _sumBy2.default)(x, v => v === '..');
module.exports = {
meta: {
docs: {
url: (0, _docsUrl2.default)('no-useless-path-segments')
},
schema: [{
type: 'object',
properties: {
commonjs: { type: 'boolean' }
},
additionalProperties: false
}],
fixable: 'code'
},
create: function (context) {
const currentDir = _path2.default.dirname(context.getFilename());
function checkSourceValue(source) {
const value = source.value;
function report(proposed) {
context.report({
node: source,
message: `Useless path segments for "${value}", should be "${proposed}"`,
fix: fixer => fixer.replaceText(source, JSON.stringify(proposed))
});
}
if (!value.startsWith('.')) {
return;
}
const resolvedPath = (0, _resolve2.default)(value, context);
const normed = normalize(value);
if (normed !== value && resolvedPath === (0, _resolve2.default)(normed, context)) {
return report(normed);
}
if (value.startsWith('./')) {
return;
}
if (resolvedPath === undefined) {
return;
}
const expected = _path2.default.relative(currentDir, resolvedPath);
const expectedSplit = expected.split(_path2.default.sep);
const valueSplit = value.replace(/^\.\//, '').split('/');
const valueNRelParents = countRelParent(valueSplit);
const expectedNRelParents = countRelParent(expectedSplit);
const diff = valueNRelParents - expectedNRelParents;
if (diff <= 0) {
return;
}
return report(toRel(valueSplit.slice(0, expectedNRelParents).concat(valueSplit.slice(valueNRelParents + diff)).join('/')));
}
return (0, _moduleVisitor2.default)(checkSourceValue, context.options[0]);
}
};
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