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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 <text>'

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)
}

Filemanager

Name Type Size Permission Actions
auth Folder 0755
config Folder 0755
doctor Folder 0755
install Folder 0755
search Folder 0755
utils Folder 0755
access.js File 5.54 KB 0644
adduser.js File 1.31 KB 0644
audit.js File 10.56 KB 0644
bin.js File 515 B 0644
bugs.js File 864 B 0644
build.js File 4.44 KB 0644
cache.js File 4.66 KB 0644
ci.js File 1.31 KB 0644
completion.js File 7.11 KB 0644
config.js File 7.43 KB 0644
dedupe.js File 4.88 KB 0644
deprecate.js File 2.11 KB 0644
dist-tag.js File 4.11 KB 0644
docs.js File 1.04 KB 0644
doctor.js File 3.98 KB 0644
edit.js File 1.37 KB 0644
explore.js File 1.67 KB 0644
fetch-package-metadata.js File 3.97 KB 0644
fetch-package-metadata.md File 1.77 KB 0644
fund.js File 4.91 KB 0644
get.js File 235 B 0644
help-search.js File 5.64 KB 0644
help.js File 6.35 KB 0644
hook.js File 4.62 KB 0644
init.js File 2.74 KB 0644
install-ci-test.js File 486 B 0644
install-test.js File 507 B 0644
install.js File 36.47 KB 0644
link.js File 5.6 KB 0644
logout.js File 1.26 KB 0644
ls.js File 16.09 KB 0644
npm.js File 14.37 KB 0644
org.js File 4.18 KB 0644
outdated.js File 12.28 KB 0644
owner.js File 6.6 KB 0644
pack.js File 11.79 KB 0644
ping.js File 1.11 KB 0644
prefix.js File 330 B 0644
profile.js File 11.13 KB 0644
prune.js File 2.23 KB 0644
publish.js File 5.14 KB 0644
rebuild.js File 2.09 KB 0644
repo.js File 1.44 KB 0644
restart.js File 64 B 0644
root.js File 320 B 0644
run-script.js File 5.41 KB 0644
search.js File 3.36 KB 0644
set.js File 276 B 0644
shrinkwrap.js File 9.82 KB 0644
star.js File 2.11 KB 0644
stars.js File 1.03 KB 0644
start.js File 62 B 0644
stop.js File 61 B 0644
substack.js File 509 B 0644
team.js File 4.61 KB 0644
test.js File 374 B 0644
token.js File 6.66 KB 0644
unbuild.js File 4.27 KB 0644
uninstall.js File 2.21 KB 0644
unpublish.js File 3.51 KB 0644
update.js File 2.16 KB 0644
version.js File 9.79 KB 0644
view.js File 15.11 KB 0644
visnup.js File 4.01 KB 0644
whoami.js File 1.77 KB 0644
xmas.js File 1.62 KB 0644