Read a question from stdout and write response to stdin
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Consider this bash script:
# script-with-input.sh
# can't change this file :(
echo Hi
read -p "what's your name: " name
echo "That's a nice name."
read -p "what's you job: " job
echo Hello, $job $name!
How do I communicate with it using child_process.spawn and give meaningful responses to the questions?
I need to get a question before giving a response (can't base my responses just on order), but my app just hangs awaiting for input and there is no question on stdout.
I know this is related to stdout being line buffered but don't know how to solve it.
const child_process = require('child_process')
const cmd = 'sh script-with-input.sh'
const child = child_process.spawn(cmd, , {shell: true})
child.stdout.on('data', data => {
console.log('data:', data.toString())
})
//child.stdin.write('Johnnmetalworkern')
function getResponse(question) { //...how do I get the question?
return question.includes('name') ? 'John' : 'metalworker'
}
node.js stdout stdin child-process spawn
asked Nov 7 at 15:03
grabantot
952617
add a comment |
up vote
0
down vote
favorite
Consider this bash script:
# script-with-input.sh
# can't change this file :(
echo Hi
read -p "what's your name: " name
echo "That's a nice name."
read -p "what's you job: " job
echo Hello, $job $name!
How do I communicate with it using child_process.spawn and give meaningful responses to the questions?
I need to get a question before giving a response (can't base my responses just on order), but my app just hangs awaiting for input and there is no question on stdout.
I know this is related to stdout being line buffered but don't know how to solve it.
const child_process = require('child_process')
const cmd = 'sh script-with-input.sh'
const child = child_process.spawn(cmd, , {shell: true})
child.stdout.on('data', data => {
console.log('data:', data.toString())
})
//child.stdin.write('Johnnmetalworkern')
function getResponse(question) { //...how do I get the question?
return question.includes('name') ? 'John' : 'metalworker'
}
node.js stdout stdin child-process spawn
asked Nov 7 at 15:03
grabantot
952617
Sounds like you want to use thereadlinemodule from the standard library.
– Sven
Nov 7 at 15:28
@Sven Don't see how I can use it. It would've been useful as a replacement for the bash script. But there is no problem with the bash script, it does the job of asking questions just fine. I can't edit it anyway. The problem is that I am unable to read the questions properly.
– grabantot
Nov 7 at 15:47
similar question: stackoverflow.com/questions/15339379/…
– grabantot
Nov 7 at 16:52
one solution I found ispty.jsnpm module, still looking for a better alternative...
– grabantot
Nov 7 at 17:54
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Consider this bash script:
# script-with-input.sh
# can't change this file :(
echo Hi
read -p "what's your name: " name
echo "That's a nice name."
read -p "what's you job: " job
echo Hello, $job $name!
How do I communicate with it using child_process.spawn and give meaningful responses to the questions?
I need to get a question before giving a response (can't base my responses just on order), but my app just hangs awaiting for input and there is no question on stdout.
I know this is related to stdout being line buffered but don't know how to solve it.
const child_process = require('child_process')
const cmd = 'sh script-with-input.sh'
const child = child_process.spawn(cmd, , {shell: true})
child.stdout.on('data', data => {
console.log('data:', data.toString())
})
//child.stdin.write('Johnnmetalworkern')
function getResponse(question) { //...how do I get the question?
return question.includes('name') ? 'John' : 'metalworker'
}
node.js stdout stdin child-process spawn
asked Nov 7 at 15:03
grabantot
952617
Consider this bash script:
# script-with-input.sh
# can't change this file :(
echo Hi
read -p "what's your name: " name
echo "That's a nice name."
read -p "what's you job: " job
echo Hello, $job $name!
How do I communicate with it using child_process.spawn and give meaningful responses to the questions?
I need to get a question before giving a response (can't base my responses just on order), but my app just hangs awaiting for input and there is no question on stdout.
I know this is related to stdout being line buffered but don't know how to solve it.
const child_process = require('child_process')
const cmd = 'sh script-with-input.sh'
const child = child_process.spawn(cmd, , {shell: true})
child.stdout.on('data', data => {
console.log('data:', data.toString())
})
//child.stdin.write('Johnnmetalworkern')
function getResponse(question) { //...how do I get the question?
return question.includes('name') ? 'John' : 'metalworker'
}
node.js stdout stdin child-process spawn
node.js stdout stdin child-process spawn
asked Nov 7 at 15:03
grabantot
952617
asked Nov 7 at 15:03
grabantot
952617
edited Nov 7 at 15:24
asked Nov 7 at 15:03
grabantot
952617
asked Nov 7 at 15:03
grabantot
952617
asked Nov 7 at 15:03
grabantot
952617
952617
Sounds like you want to use thereadlinemodule from the standard library.
– Sven
Nov 7 at 15:28
@Sven Don't see how I can use it. It would've been useful as a replacement for the bash script. But there is no problem with the bash script, it does the job of asking questions just fine. I can't edit it anyway. The problem is that I am unable to read the questions properly.
– grabantot
Nov 7 at 15:47
similar question: stackoverflow.com/questions/15339379/…
– grabantot
Nov 7 at 16:52
one solution I found ispty.jsnpm module, still looking for a better alternative...
– grabantot
Nov 7 at 17:54
add a comment |
Sounds like you want to use thereadlinemodule from the standard library.
– Sven
Nov 7 at 15:28
@Sven Don't see how I can use it. It would've been useful as a replacement for the bash script. But there is no problem with the bash script, it does the job of asking questions just fine. I can't edit it anyway. The problem is that I am unable to read the questions properly.
– grabantot
Nov 7 at 15:47
similar question: stackoverflow.com/questions/15339379/…
– grabantot
Nov 7 at 16:52
one solution I found ispty.jsnpm module, still looking for a better alternative...
– grabantot
Nov 7 at 17:54
Sounds like you want to use the
readline module from the standard library.– Sven
Nov 7 at 15:28
Sounds like you want to use the
readline module from the standard library.– Sven
Nov 7 at 15:28
@Sven Don't see how I can use it. It would've been useful as a replacement for the bash script. But there is no problem with the bash script, it does the job of asking questions just fine. I can't edit it anyway. The problem is that I am unable to read the questions properly.
– grabantot
Nov 7 at 15:47
@Sven Don't see how I can use it. It would've been useful as a replacement for the bash script. But there is no problem with the bash script, it does the job of asking questions just fine. I can't edit it anyway. The problem is that I am unable to read the questions properly.
– grabantot
Nov 7 at 15:47
similar question: stackoverflow.com/questions/15339379/…
– grabantot
Nov 7 at 16:52
similar question: stackoverflow.com/questions/15339379/…
– grabantot
Nov 7 at 16:52
one solution I found is
pty.js npm module, still looking for a better alternative...– grabantot
Nov 7 at 17:54
one solution I found is
pty.js npm module, still looking for a better alternative...– grabantot
Nov 7 at 17:54
add a comment |
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Sounds like you want to use the
readlinemodule from the standard library.– Sven
Nov 7 at 15:28
@Sven Don't see how I can use it. It would've been useful as a replacement for the bash script. But there is no problem with the bash script, it does the job of asking questions just fine. I can't edit it anyway. The problem is that I am unable to read the questions properly.
– grabantot
Nov 7 at 15:47
similar question: stackoverflow.com/questions/15339379/…
– grabantot
Nov 7 at 16:52
one solution I found is
pty.jsnpm module, still looking for a better alternative...– grabantot
Nov 7 at 17:54