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 liuqimichale
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###*
Most of the code adopted from the npm package shell completion code.
See https://github.com/isaacs/npm/blob/master/lib/completion.js
###
Q = require 'q'
escape = require('./shell').escape
unescape = require('./shell').unescape
module.exports = ->
@title('Shell completion')
.helpful()
.arg()
.name('raw')
.title('Completion words')
.arr()
.end()
.act (opts, args) ->
if process.platform == 'win32'
e = new Error 'shell completion not supported on windows'
e.code = 'ENOTSUP'
e.errno = require('constants').ENOTSUP
return @reject(e)
# if the COMP_* isn't in the env, then just dump the script
if !process.env.COMP_CWORD? or !process.env.COMP_LINE? or !process.env.COMP_POINT?
return dumpScript(@_cmd._name)
console.error 'COMP_LINE: %s', process.env.COMP_LINE
console.error 'COMP_CWORD: %s', process.env.COMP_CWORD
console.error 'COMP_POINT: %s', process.env.COMP_POINT
console.error 'args: %j', args.raw
# completion opts
opts = getOpts args.raw
# cmd
{ cmd, argv } = @_cmd._parseCmd opts.partialWords
Q.when complete(cmd, opts), (compls) ->
console.error 'filtered: %j', compls
console.log compls.map(escape).join('\n')
dumpScript = (name) ->
fs = require 'fs'
path = require 'path'
defer = Q.defer()
fs.readFile path.resolve(__dirname, 'completion.sh'), 'utf8', (err, d) ->
if err then return defer.reject err
d = d.replace(/{{cmd}}/g, path.basename name).replace(/^\#\!.*?\n/, '')
onError = (err) ->
# Darwin is a real dick sometimes.
#
# This is necessary because the "source" or "." program in
# bash on OS X closes its file argument before reading
# from it, meaning that you get exactly 1 write, which will
# work most of the time, and will always raise an EPIPE.
#
# Really, one should not be tossing away EPIPE errors, or any
# errors, so casually. But, without this, `. <(cmd completion)`
# can never ever work on OS X.
if err.errno == require('constants').EPIPE
process.stdout.removeListener 'error', onError
defer.resolve()
else
defer.reject(err)
process.stdout.on 'error', onError
process.stdout.write d, -> defer.resolve()
defer.promise
getOpts = (argv) ->
# get the partial line and partial word, if the point isn't at the end
# ie, tabbing at: cmd foo b|ar
line = process.env.COMP_LINE
w = +process.env.COMP_CWORD
point = +process.env.COMP_POINT
words = argv.map unescape
word = words[w]
partialLine = line.substr 0, point
partialWords = words.slice 0, w
# figure out where in that last word the point is
partialWord = argv[w] or ''
i = partialWord.length
while partialWord.substr(0, i) isnt partialLine.substr(-1 * i) and i > 0
i--
partialWord = unescape partialWord.substr 0, i
if partialWord then partialWords.push partialWord
{
line: line
w: w
point: point
words: words
word: word
partialLine: partialLine
partialWords: partialWords
partialWord: partialWord
}
complete = (cmd, opts) ->
compls = []
# complete on cmds
if opts.partialWord.indexOf('-')
compls = Object.keys(cmd._cmdsByName)
# Complete on required opts without '-' in last partial word
# (if required not already specified)
#
# Commented out because of uselessness:
# -b, --block suggest results in '-' on cmd line;
# next completion suggest all options, because of '-'
#.concat Object.keys(cmd._optsByKey).filter (v) -> cmd._optsByKey[v]._req
else
# complete on opt values: --opt=| case
if m = opts.partialWord.match /^(--\w[\w-_]*)=(.*)$/
optWord = m[1]
optPrefix = optWord + '='
else
# complete on opts
# don't complete on opts in case of --opt=val completion
# TODO: don't complete on opts in case of unknown arg after commands
# TODO: complete only on opts with arr() or not already used
# TODO: complete only on full opts?
compls = Object.keys cmd._optsByKey
# complete on opt values: next arg case
if not (o = opts.partialWords[opts.w - 1]).indexOf '-'
optWord = o
# complete on opt values: completion
if optWord and opt = cmd._optsByKey[optWord]
if not opt._flag and opt._comp
compls = Q.join compls, Q.when opt._comp(opts), (c, o) ->
c.concat o.map (v) -> (optPrefix or '') + v
# TODO: complete on args values (context aware, custom completion?)
# custom completion on cmds
if cmd._comp
compls = Q.join compls, Q.when(cmd._comp(opts)), (c, o) ->
c.concat o
# TODO: context aware custom completion on cmds, opts and args
# (can depend on already entered values, especially options)
Q.when compls, (compls) ->
console.error 'partialWord: %s', opts.partialWord
console.error 'compls: %j', compls
compls.filter (c) -> c.indexOf(opts.partialWord) is 0
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