module.exports = helpSearch var fs = require('graceful-fs') var path = require('path') var asyncMap = require('slide').asyncMap var npm = require('./npm.js') var glob = require('glob') var color = require('ansicolors') var output = require('./utils/output.js') helpSearch.usage = 'npm help-search ' function helpSearch (args, silent, cb) { if (typeof cb !== 'function') { cb = silent silent = false } if (!args.length) return cb(helpSearch.usage) var docPath = path.resolve(__dirname, '..', 'doc') return glob(docPath + '/*/*.md', function (er, files) { if (er) return cb(er) readFiles(files, function (er, data) { if (er) return cb(er) searchFiles(args, data, function (er, results) { if (er) return cb(er) formatResults(args, results, cb) }) }) }) } function readFiles (files, cb) { var res = {} asyncMap(files, function (file, cb) { fs.readFile(file, 'utf8', function (er, data) { res[file] = data return cb(er) }) }, function (er) { return cb(er, res) }) } function searchFiles (args, files, cb) { var results = [] Object.keys(files).forEach(function (file) { var data = files[file] // skip if no matches at all var match for (var a = 0, l = args.length; a < l && !match; a++) { match = data.toLowerCase().indexOf(args[a].toLowerCase()) !== -1 } if (!match) return var lines = data.split(/\n+/) // if a line has a search term, then skip it and the next line. // if the next line has a search term, then skip all 3 // otherwise, set the line to null. then remove the nulls. l = lines.length for (var i = 0; i < l; i++) { var line = lines[i] var nextLine = lines[i + 1] var ll match = false if (nextLine) { for (a = 0, ll = args.length; a < ll && !match; a++) { match = nextLine.toLowerCase() .indexOf(args[a].toLowerCase()) !== -1 } if (match) { // skip over the next line, and the line after it. i += 2 continue } } match = false for (a = 0, ll = args.length; a < ll && !match; a++) { match = line.toLowerCase().indexOf(args[a].toLowerCase()) !== -1 } if (match) { // skip over the next line i++ continue } lines[i] = null } // now squish any string of nulls into a single null lines = lines.reduce(function (l, r) { if (!(r === null && l[l.length - 1] === null)) l.push(r) return l }, []) if (lines[lines.length - 1] === null) lines.pop() if (lines[0] === null) lines.shift() // now see how many args were found at all. var found = {} var totalHits = 0 lines.forEach(function (line) { args.forEach(function (arg) { var hit = (line || '').toLowerCase() .split(arg.toLowerCase()).length - 1 if (hit > 0) { found[arg] = (found[arg] || 0) + hit totalHits += hit } }) }) var cmd = 'npm help ' if (path.basename(path.dirname(file)) === 'api') { cmd = 'npm apihelp ' } cmd += path.basename(file, '.md').replace(/^npm-/, '') results.push({ file: file, cmd: cmd, lines: lines, found: Object.keys(found), hits: found, totalHits: totalHits }) }) // if only one result, then just show that help section. if (results.length === 1) { return npm.commands.help([results[0].file.replace(/\.md$/, '')], cb) } if (results.length === 0) { output('No results for ' + args.map(JSON.stringify).join(' ')) return cb() } // sort results by number of results found, then by number of hits // then by number of matching lines results = results.sort(function (a, b) { return a.found.length > b.found.length ? -1 : a.found.length < b.found.length ? 1 : a.totalHits > b.totalHits ? -1 : a.totalHits < b.totalHits ? 1 : a.lines.length > b.lines.length ? -1 : a.lines.length < b.lines.length ? 1 : 0 }) cb(null, results) } function formatResults (args, results, cb) { if (!results) return cb(null) var cols = Math.min(process.stdout.columns || Infinity, 80) + 1 var out = results.map(function (res) { var out = res.cmd var r = Object.keys(res.hits) .map(function (k) { return k + ':' + res.hits[k] }).sort(function (a, b) { return a > b ? 1 : -1 }).join(' ') out += ((new Array(Math.max(1, cols - out.length - r.length))) .join(' ')) + r if (!npm.config.get('long')) return out out = '\n\n' + out + '\n' + (new Array(cols)).join('—') + '\n' + res.lines.map(function (line, i) { if (line === null || i > 3) return '' for (var out = line, a = 0, l = args.length; a < l; a++) { var finder = out.toLowerCase().split(args[a].toLowerCase()) var newOut = '' var p = 0 finder.forEach(function (f) { newOut += out.substr(p, f.length) var hilit = out.substr(p + f.length, args[a].length) if (npm.color) hilit = color.bgBlack(color.red(hilit)) newOut += hilit p += f.length + args[a].length }) } return newOut }).join('\n').trim() return out }).join('\n') if (results.length && !npm.config.get('long')) { out = 'Top hits for ' + (args.map(JSON.stringify).join(' ')) + '\n' + (new Array(cols)).join('—') + '\n' + out + '\n' + (new Array(cols)).join('—') + '\n' + '(run with -l or --long to see more context)' } output(out.trim()) cb(null, results) }