// npm explore <pkg>[@<version>]

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// open a subshell to the package folder.

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module.exports = explore

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explore.usage = 'npm explore <pkg> [ -- <command>]'

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explore.completion = require('./utils/completion/installed-shallow.js')

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var npm = require('./npm.js')

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var spawn = require('./utils/spawn')

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var path = require('path')

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var fs = require('graceful-fs')

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var isWindows = require('./utils/is-windows.js')

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var escapeExecPath = require('./utils/escape-exec-path.js')

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var escapeArg = require('./utils/escape-arg.js')

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var output = require('./utils/output.js')

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var log = require('npmlog')

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function explore (args, cb) {

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if (args.length < 1 || !args[0]) return cb(explore.usage)

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var p = args.shift()

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var cwd = path.resolve(npm.dir, p)

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var opts = {cwd: cwd, stdio: 'inherit'}

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var shellArgs = []

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if (args.length) {

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if (isWindows) {

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var execCmd = escapeExecPath(args.shift())

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var execArgs = [execCmd].concat(args.map(escapeArg))

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opts.windowsVerbatimArguments = true

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shellArgs = ['/d', '/s', '/c'].concat(execArgs)

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} else {

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shellArgs = ['-c', args.map(escapeArg).join(' ').trim()]

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}

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}

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var sh = npm.config.get('shell')

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fs.stat(cwd, function (er, s) {

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if (er || !s.isDirectory()) {

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return cb(new Error(

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"It doesn't look like " + p + ' is installed.'

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))

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}

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if (!shellArgs.length) {

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output(

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'\nExploring ' + cwd + '\n' +

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"Type 'exit' or ^D when finished\n"

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)

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}

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log.silly('explore', {sh, shellArgs, opts})

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var shell = spawn(sh, shellArgs, opts)

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shell.on('close', function (er) {

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// only fail if non-interactive.

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if (!shellArgs.length) return cb()

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cb(er)

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})

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})

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}

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