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/**
@babel
*/
import
_
from
'underscore-plus'
import
ChildProcess
from
'child_process'
import
{
Emitter
}
from
'event-kit'
import
path
from
'path'
// Extended: A wrapper which provides standard error/output line buffering for
// Node's ChildProcess.
//
// ## Examples
//
// ```js
// {BufferedProcess} = require('atom')
//
// const command = 'ps'
// const args = ['-ef']
// const stdout = (output) => console.log(output)
// const exit = (code) => console.log("ps -ef exited with #{code}")
// const process = new BufferedProcess({command, args, stdout, exit})
// ```
export
default
class
BufferedProcess
{
/*
Section: Construction
*/
// Public: Runs the given command by spawning a new child process.
//
// * `options` An {Object} with the following keys:
// * `command` The {String} command to execute.
// * `args` The {Array} of arguments to pass to the command (optional).
// * `options` {Object} (optional) The options {Object} to pass to Node's
// `ChildProcess.spawn` method.
// * `stdout` {Function} (optional) The callback that receives a single
// argument which contains the standard output from the command. The
// callback is called as data is received but it's buffered to ensure only
// complete lines are passed until the source stream closes. After the
// source stream has closed all remaining data is sent in a final call.
// * `data` {String}
// * `stderr` {Function} (optional) The callback that receives a single
// argument which contains the standard error output from the command. The
// callback is called as data is received but it's buffered to ensure only
// complete lines are passed until the source stream closes. After the
// source stream has closed all remaining data is sent in a final call.
// * `data` {String}
// * `exit` {Function} (optional) The callback which receives a single
// argument containing the exit status.
// * `code` {Number}
// * `autoStart` {Boolean} (optional) Whether the command will automatically start
// when this BufferedProcess is created. Defaults to true. When set to false you
// must call the `start` method to start the process.
constructor
(
{
command
,
args
,
options
=
{
}
,
stdout
,
stderr
,
exit
,
autoStart
=
true
}
=
{
}
)
{
this
.
emitter
=
new
Emitter
(
)
this
.
command
=
command
this
.
args
=
args
this
.
options
=
options
this
.
stdout
=
stdout
this
.
stderr
=
stderr
this
.
exit
=
exit
if
(
autoStart
===
true
)
{
this
.
start
(
)
}
this
.
killed
=
false
}
start
(
)
{
if
(
this
.
started
===
true
)
return
this
.
started
=
true
// Related to joyent/node#2318
if
(
process
.
platform
===
'win32'
&&
this
.
options
.
shell
===
undefined
)
{
this
.
spawnWithEscapedWindowsArgs
(
this
.
command
,
this
.
args
,
this
.
options
)
}
else
{
this
.
spawn
(
this
.
command
,
this
.
args
,
this
.
options
)
}
this
.
handleEvents
(
this
.
stdout
,
this
.
stderr
,
this
.
exit
)
}
// Windows has a bunch of special rules that node still doesn't take care of for you
spawnWithEscapedWindowsArgs
(
command
,
args
,
options
)
{
let
cmdArgs
=
[
]
// Quote all arguments and escapes inner quotes
if
(
args
)
{
cmdArgs
=
args
.
filter
(
(
arg
)
=>
arg
!=
null
)
.
map
(
(
arg
)
=>
{
if
(
this
.
isExplorerCommand
(
command
)
&&
/
^
\/
[
a
-
z
A
-
Z
]
+
,
.
*
$
/
.
test
(
arg
)
)
{
// Don't wrap /root,C:\folder style arguments to explorer calls in
// quotes since they will not be interpreted correctly if they are
return
arg
}
else
{
// Escape double quotes by putting a backslash in front of them
return
`\"
${
arg
.
toString
(
)
.
replace
(
/
"
/
g
,
'\\"'
)
}
\"`
}
}
)
}
// The command itself is quoted if it contains spaces, &, ^, | or # chars
cmdArgs
.
unshift
(
/
\s
|
&
|
\^
|
\(
|
\)
|
\|
|
#
/
.
test
(
command
)
?
`\"
${
command
}
\"`
:
command
)
const
cmdOptions
=
_
.
clone
(
options
)
cmdOptions
.
windowsVerbatimArguments
=
true
this
.
spawn
(
this
.
getCmdPath
(
)
,
[
'/s'
,
'/d'
,
'/c'
,
`\"
${
cmdArgs
.
join
(
' '
)
}
\"`
]
,
cmdOptions
)
}
/*
Section: Event Subscription
*/
// Public: Will call your callback when an error will be raised by the process.
// Usually this is due to the command not being available or not on the PATH.
// You can call `handle()` on the object passed to your callback to indicate
// that you have handled this error.
//
// * `callback` {Function} callback
// * `errorObject` {Object}
// * `error` {Object} the error object
// * `handle` {Function} call this to indicate you have handled the error.
// The error will not be thrown if this function is called.
//
// Returns a {Disposable}
onWillThrowError
(
callback
)
{
return
this
.
emitter
.
on
(
'will-throw-error'
,
callback
)
}
/*
Section: Helper Methods
*/
// Helper method to pass data line by line.
//
// * `stream` The Stream to read from.
// * `onLines` The callback to call with each line of data.
// * `onDone` The callback to call when the stream has closed.
bufferStream
(
stream
,
onLines
,
onDone
)
{
stream
.
setEncoding
(
'utf8'
)
let
buffered
=
''
stream
.
on
(
'data'
,
(
data
)
=>
{
if
(
this
.
killed
)
return
let
bufferedLength
=
buffered
.
length
buffered
+=
data
let
lastNewlineIndex
=
data
.
lastIndexOf
(
'\n'
)
if
(
lastNewlineIndex
!==
-
1
)
{
let
lineLength
=
lastNewlineIndex
+
bufferedLength
+
1
onLines
(
buffered
.
substring
(
0
,
lineLength
)
)
buffered
=
buffered
.
substring
(
lineLength
)
}
}
)
stream
.
on
(
'close'
,
(
)
=>
{
if
(
this
.
killed
)
return
if
(
buffered
.
length
>
0
)
onLines
(
buffered
)
onDone
(
)
}
)
}
// Kill all child processes of the spawned cmd.exe process on Windows.
//
// This is required since killing the cmd.exe does not terminate child
// processes.
killOnWindows
(
)
{
if
(
!
this
.
process
)
return
const
parentPid
=
this
.
process
.
pid
const
cmd
=
'wmic'
const
args
=
[
'process'
,
'where'
,
`(ParentProcessId=
${
parentPid
}
)`
,
'get'
,
'processid'
]
let
wmicProcess
try
{
wmicProcess
=
ChildProcess
.
spawn
(
cmd
,
args
)
}
catch
(
spawnError
)
{
this
.
killProcess
(
)
return
}
wmicProcess
.
on
(
'error'
,
(
)
=>
{
}
)
// ignore errors
let
output
=
''
wmicProcess
.
stdout
.
on
(
'data'
,
(
data
)
=>
{
output
+=
data
}
)
wmicProcess
.
stdout
.
on
(
'close'
,
(
)
=>
{
const
pidsToKill
=
output
.
split
(
/
\s
+
/
)
.
filter
(
(
pid
)
=>
/
^
\d
+
$
/
.
test
(
pid
)
)
.
map
(
(
pid
)
=>
parseInt
(
pid
)
)
.
filter
(
(
pid
)
=>
pid
!==
parentPid
&&
pid
>
0
&&
pid
<
Infinity
)
for
(
let
pid
of
pidsToKill
)
{
try
{
process
.
kill
(
pid
)
}
catch
(
error
)
{
}
}
this
.
killProcess
(
)
}
)
}
killProcess
(
)
{
if
(
this
.
process
)
this
.
process
.
kill
(
)
this
.
process
=
null
}
isExplorerCommand
(
command
)
{
if
(
command
===
'explorer.exe'
||
command
===
'explorer'
)
{
return
true
}
else
if
(
process
.
env
.
SystemRoot
)
{
return
command
===
path
.
join
(
process
.
env
.
SystemRoot
,
'explorer.exe'
)
||
command
===
path
.
join
(
process
.
env
.
SystemRoot
,
'explorer'
)
}
else
{
return
false
}
}
getCmdPath
(
)
{
if
(
process
.
env
.
comspec
)
{
return
process
.
env
.
comspec
}
else
if
(
process
.
env
.
SystemRoot
)
{
return
path
.
join
(
process
.
env
.
SystemRoot
,
'System32'
,
'cmd.exe'
)
}
else
{
return
'cmd.exe'
}
}
// Public: Terminate the process.
kill
(
)
{
if
(
this
.
killed
)
return
this
.
killed
=
true
if
(
process
.
platform
===
'win32'
)
{
this
.
killOnWindows
(
)
}
else
{
this
.
killProcess
(
)
}
}
spawn
(
command
,
args
,
options
)
{
try
{
this
.
process
=
ChildProcess
.
spawn
(
command
,
args
,
options
)
}
catch
(
spawnError
)
{
process
.
nextTick
(
(
)
=>
this
.
handleError
(
spawnError
)
)
}
}
handleEvents
(
stdout
,
stderr
,
exit
)
{
if
(
!
this
.
process
)
return
const
triggerExitCallback
=
(
)
=>
{
if
(
this
.
killed
)
return
if
(
stdoutClosed
&&
stderrClosed
&&
processExited
&&
typeof
exit
===
'function'
)
{
exit
(
exitCode
)
}
}
let
stdoutClosed
=
true
let
stderrClosed
=
true
let
processExited
=
true
let
exitCode
=
0
if
(
stdout
)
{
stdoutClosed
=
false
this
.
bufferStream
(
this
.
process
.
stdout
,
stdout
,
(
)
=>
{
stdoutClosed
=
true
triggerExitCallback
(
)
}
)
}
if
(
stderr
)
{
stderrClosed
=
false
this
.
bufferStream
(
this
.
process
.
stderr
,
stderr
,
(
)
=>
{
stderrClosed
=
true
triggerExitCallback
(
)
}
)
}
if
(
exit
)
{
processExited
=
false
this
.
process
.
on
(
'exit'
,
(
code
)
=>
{
exitCode
=
code
processExited
=
true
triggerExitCallback
(
)
}
)
}
this
.
process
.
on
(
'error'
,
(
error
)
=>
{
this
.
handleError
(
error
)
}
)
}
handleError
(
error
)
{
let
handled
=
false
const
handle
=
(
)
=>
{
handled
=
true
}
this
.
emitter
.
emit
(
'will-throw-error'
,
{
error
,
handle
}
)
if
(
error
.
code
===
'ENOENT'
&&
error
.
syscall
.
indexOf
(
'spawn'
)
===
0
)
{
error
=
new
Error
(
`Failed to spawn command \`
${
this
.
command
}
\`. Make sure \`
${
this
.
command
}
\` is installed and on your PATH`
,
error
.
path
)
error
.
name
=
'BufferedProcessError'
}
if
(
!
handled
)
throw
error
}
}
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