aaac7fed
 liuqimichale
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fs = require 'fs'
Q = require 'q'
Color = require('./color').Color
Cmd = require('./cmd').Cmd
###*
Option
Named entity. Options may have short and long keys for use from command line.
@namespace
@class Presents option
###
exports.Opt = class Opt
###*
@constructs
@param {COA.Cmd} cmd parent command
###
constructor: (@_cmd) -> @_cmd._opts.push @
###*
Set a canonical option identifier to be used anywhere in the API.
@param {String} _name option name
@returns {COA.Opt} this instance (for chainability)
###
name: (@_name) -> @
###*
Set a long description for option to be used anywhere in text messages.
@param {String} _title option title
@returns {COA.Opt} this instance (for chainability)
###
title: Cmd::title
###*
Set a short key for option to be used with one hyphen from command line.
@param {String} _short
@returns {COA.Opt} this instance (for chainability)
###
short: (@_short) -> @_cmd._optsByKey['-' + _short] = @
###*
Set a short key for option to be used with double hyphens from command line.
@param {String} _long
@returns {COA.Opt} this instance (for chainability)
###
long: (@_long) -> @_cmd._optsByKey['--' + _long] = @
###*
Make an option boolean, i.e. option without value.
@returns {COA.Opt} this instance (for chainability)
###
flag: () ->
@_flag = true
@
###*
Makes an option accepts multiple values.
Otherwise, the value will be used by the latter passed.
@returns {COA.Opt} this instance (for chainability)
###
arr: ->
@_arr = true
@
###*
Makes an option required.
@returns {COA.Opt} this instance (for chainability)
###
req: ->
@_req = true
@
###*
Makes an option to act as a command,
i.e. program will exit just after option action.
@returns {COA.Opt} this instance (for chainability)
###
only: ->
@_only = true
@
###*
Set a validation (or value) function for option.
Value from command line passes through before becoming available from API.
Using for validation and convertion simple types to any values.
@param {Function} _val validating function,
invoked in the context of option instance
and has one parameter with value from command line
@returns {COA.Opt} this instance (for chainability)
###
val: (@_val) -> @
###*
Set a default value for option.
Default value passed through validation function as ordinary value.
@param {Object} _def
@returns {COA.Opt} this instance (for chainability)
###
def: (@_def) -> @
###*
Make option value inputting stream.
It's add useful validation and shortcut for STDIN.
@returns {COA.Opt} this instance (for chainability)
###
input: ->
# XXX: hack to workaround a bug in node 0.6.x,
# see https://github.com/joyent/node/issues/2130
process.stdin.pause();
@
.def(process.stdin)
.val (v) ->
if typeof v is 'string'
if v is '-'
process.stdin
else
s = fs.createReadStream v, { encoding: 'utf8' }
s.pause()
s
else v
###*
Make option value outputing stream.
It's add useful validation and shortcut for STDOUT.
@returns {COA.Opt} this instance (for chainability)
###
output: ->
@
.def(process.stdout)
.val (v) ->
if typeof v is 'string'
if v is '-'
process.stdout
else
fs.createWriteStream v, { encoding: 'utf8' }
else v
###*
Add action for current option command.
This action is performed if the current option
is present in parsed options (with any value).
@param {Function} act action function,
invoked in the context of command instance
and has the parameters:
- {Object} opts parsed options
- {Array} args parsed arguments
- {Object} res actions result accumulator
It can return rejected promise by Cmd.reject (in case of error)
or any other value treated as result.
@returns {COA.Opt} this instance (for chainability)
###
act: (act) ->
opt = @
name = @_name
@_cmd.act (opts) ->
if name of opts
res = act.apply @, arguments
if opt._only
Q.when res, (res) =>
@reject {
toString: -> res.toString()
exitCode: 0
}
else
res
@
###*
Set custom additional completion for current option.
@param {Function} completion generation function,
invoked in the context of option instance.
Accepts parameters:
- {Object} opts completion options
It can return promise or any other value treated as result.
@returns {COA.Opt} this instance (for chainability)
###
comp: Cmd::comp
_saveVal: (opts, val) ->
if @_val then val = @_val val
if @_arr
(opts[@_name] or= []).push val
else
opts[@_name] = val
val
_parse: (argv, opts) ->
@_saveVal(
opts,
if @_flag
true
else
argv.shift()
)
_checkParsed: (opts, args) -> not opts.hasOwnProperty @_name
_usage: ->
res = []
nameStr = @_name.toUpperCase()
if @_short
res.push '-', Color 'lgreen', @_short
unless @_flag then res.push ' ' + nameStr
res.push ', '
if @_long
res.push '--', Color 'green', @_long
unless @_flag then res.push '=' + nameStr
res.push ' : ', @_title
if @_req then res.push ' ', Color('lred', '(required)')
res.join ''
_requiredText: -> 'Missing required option:\n ' + @_usage()
###*
Return rejected promise with error code.
Use in .val() for return with error.
@param {Object} reject reason
You can customize toString() method and exitCode property
of reason object.
@returns {Q.promise} rejected promise
###
reject: Cmd::reject
###*
Finish chain for current option and return parent command instance.
@returns {COA.Cmd} parent command
###
end: Cmd::end
###*
Apply function with arguments in context of option instance.
@param {Function} fn
@param {Array} args
@returns {COA.Opt} this instance (for chainability)
###
apply: Cmd::apply
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