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module.exports = help
help.completion = function (opts, cb) {
if (opts.conf.argv.remain.length > 2) return cb(null, [])
getSections(cb)
}
var path = require('path')
var spawn = require('./utils/spawn')
var npm = require('./npm.js')
var log = require('npmlog')
var opener = require('opener')
var glob = require('glob')
var didYouMean = require('./utils/did-you-mean')
var cmdList = require('./config/cmd-list').cmdList
var shorthands = require('./config/cmd-list').shorthands
var commands = cmdList.concat(Object.keys(shorthands))
var output = require('./utils/output.js')
function help (args, cb) {
var argv = npm.config.get('argv').cooked
var argnum = 0
if (args.length === 2 && ~~args[0]) {
argnum = ~~args.shift()
}
// npm help foo bar baz: search topics
if (args.length > 1 && args[0]) {
return npm.commands['help-search'](args, argnum, cb)
}
var section = npm.deref(args[0]) || args[0]
// npm help <noargs>: show basic usage
if (!section) {
var valid = argv[0] === 'help' ? 0 : 1
return npmUsage(valid, cb)
}
// npm <command> -h: show command usage
if (npm.config.get('usage') &&
npm.commands[section] &&
npm.commands[section].usage) {
npm.config.set('loglevel', 'silent')
log.level = 'silent'
output(npm.commands[section].usage)
return cb()
}
// npm apihelp <section>: Prefer section 3 over section 1
var apihelp = argv.length && argv[0].indexOf('api') !== -1
var pref = apihelp ? [3, 1, 5, 7] : [1, 3, 5, 7]
if (argnum) {
pref = [ argnum ].concat(pref.filter(function (n) {
return n !== argnum
}))
}
// npm help <section>: Try to find the path
var manroot = path.resolve(__dirname, '..', 'man')
// legacy
if (section === 'global') section = 'folders'
else if (section === 'json') section = 'package.json'
// find either /section.n or /npm-section.n
// The glob is used in the glob. The regexp is used much
// further down. Globs and regexps are different
var compextglob = '.+(gz|bz2|lzma|[FYzZ]|xz)'
var compextre = '\\.(gz|bz2|lzma|[FYzZ]|xz)$'
var f = '+(npm-' + section + '|' + section + ').[0-9]?(' + compextglob + ')'
return glob(manroot + '/*/' + f, function (er, mans) {
if (er) return cb(er)
if (!mans.length) return npm.commands['help-search'](args, cb)
mans = mans.map(function (man) {
var ext = path.extname(man)
if (man.match(new RegExp(compextre))) man = path.basename(man, ext)
return man
})
viewMan(pickMan(mans, pref), cb)
})
}
function pickMan (mans, pref_) {
var nre = /([0-9]+)$/
var pref = {}
pref_.forEach(function (sect, i) {
pref[sect] = i
})
mans = mans.sort(function (a, b) {
var an = a.match(nre)[1]
var bn = b.match(nre)[1]
return an === bn ? (a > b ? -1 : 1)
: pref[an] < pref[bn] ? -1
: 1
})
return mans[0]
}
function viewMan (man, cb) {
var nre = /([0-9]+)$/
var num = man.match(nre)[1]
var section = path.basename(man, '.' + num)
// at this point, we know that the specified man page exists
var manpath = path.join(__dirname, '..', 'man')
var env = {}
Object.keys(process.env).forEach(function (i) {
env[i] = process.env[i]
})
env.MANPATH = manpath
var viewer = npm.config.get('viewer')
var conf
switch (viewer) {
case 'woman':
var a = ['-e', '(woman-find-file \'' + man + '\')']
conf = { env: env, stdio: 'inherit' }
var woman = spawn('emacsclient', a, conf)
woman.on('close', cb)
break
case 'browser':
opener(htmlMan(man), { command: npm.config.get('browser') }, cb)
break
default:
conf = { env: env, stdio: 'inherit' }
var manProcess = spawn('man', [num, section], conf)
manProcess.on('close', cb)
break
}
}
function htmlMan (man) {
var sect = +man.match(/([0-9]+)$/)[1]
var f = path.basename(man).replace(/([0-9]+)$/, 'html')
switch (sect) {
case 1:
sect = 'cli'
break
case 3:
sect = 'api'
break
case 5:
sect = 'files'
break
case 7:
sect = 'misc'
break
default:
throw new Error('invalid man section: ' + sect)
}
return path.resolve(__dirname, '..', 'html', 'doc', sect, f)
}
function npmUsage (valid, cb) {
npm.config.set('loglevel', 'silent')
log.level = 'silent'
output([
'\nUsage: npm <command>',
'',
'where <command> is one of:',
npm.config.get('long') ? usages()
: ' ' + wrap(commands),
'',
'npm <command> -h quick help on <command>',
'npm -l display full usage info',
'npm help <term> search for help on <term>',
'npm help npm involved overview',
'',
'Specify configs in the ini-formatted file:',
' ' + npm.config.get('userconfig'),
'or on the command line via: npm <command> --key value',
'Config info can be viewed via: npm help config',
'',
'npm@' + npm.version + ' ' + path.dirname(__dirname)
].join('\n'))
if (npm.argv.length > 1) {
didYouMean(npm.argv[1], commands)
}
cb(valid)
}
function usages () {
// return a string of <command>: <usage>
var maxLen = 0
return Object.keys(npm.commands).filter(function (c) {
return c === npm.deref(c)
}).reduce(function (set, c) {
set.push([c, npm.commands[c].usage || ''])
maxLen = Math.max(maxLen, c.length)
return set
}, []).map(function (item) {
var c = item[0]
var usage = item[1]
return '\n ' +
c + (new Array(maxLen - c.length + 2).join(' ')) +
(usage.split('\n').join('\n' + (new Array(maxLen + 6).join(' '))))
}).join('\n')
}
function wrap (arr) {
var out = ['']
var l = 0
var line
line = process.stdout.columns
if (!line) {
line = 60
} else {
line = Math.min(60, Math.max(line - 16, 24))
}
arr.sort(function (a, b) { return a < b ? -1 : 1 })
.forEach(function (c) {
if (out[l].length + c.length + 2 < line) {
out[l] += ', ' + c
} else {
out[l++] += ','
out[l] = c
}
})
return out.join('\n ').substr(2)
}
function getSections (cb) {
var g = path.resolve(__dirname, '../man/man[0-9]/*.[0-9]')
glob(g, function (er, files) {
if (er) return cb(er)
cb(null, Object.keys(files.reduce(function (acc, file) {
file = path.basename(file).replace(/\.[0-9]+$/, '')
file = file.replace(/^npm-/, '')
acc[file] = true
return acc
}, { help: true })))
})
}