英文:
Interactive process with Kotlin
问题
以下是您要的翻译内容：
I'm trying to interact with sh. This is the easiest case I want to resolve.
我正在尝试与 sh 交互。这是我想解决的最简单的情况。
The most easy is:
最简单的情况是：
typealias ExitStatus = Int
fun executeIO(cmd: List<String>): ExitStatus =
ProcessBuilder(cmd).inheritIO().start().waitFor()
But the Kotlin code doesn't have any control when the sh are executing.
但是 Kotlin 代码在 sh 执行时没有任何控制。
When you know how many times you want to write
当您知道要写多少次时：
fun executeNTimes(cmd: List<String>, times: Int) = runBlocking {
val process = ProcessBuilder(cmd)
.start()
launch { process.errorStream.bufferedReader().useLines { seq -> seq.toList().forEach { println("stderr: $it") } } }
launch { process.inputStream.bufferedReader().useLines { seq -> seq.toList().forEach { println("stdout: $it") } } }
OutputStreamWriter(process.outputStream, "UTF-8").use { w ->
repeat(times) {
readln().let { println("input: $it"); w.write(it) }
w.appendLine()
w.flush()
}
}
process.waitFor()
}
But that is not interactive!
但这并不是交互式的！
> cmd = sh and times = 2:
> cmd = sh，times = 2：
echo exit on stdout
input: echo exit on stdout
echo exit on stderr 1>&2
input: echo exit on stderr 1>&2
stderr: exit on stderr
stdout: exit on stdout
Is not interactive because needs to close the buffer for starting to work.
这不是交互式的，因为需要关闭缓冲区才能开始工作。
My expectation for an interactive process is the next one:
我的期望是进行交互式处理：
input: echo exit on stdout
stdout: exit on stdout
input: echo exit on stderr 1>&2
stderr: exit on stderr
input: exit
How can I do that?
我该如何实现这一点？
英文:
I'm trying to interact with sh. This is the easiest case I want to resolve.
The most easy is:
typealias ExitStatus = Int
fun executeIO(cmd: List<String>): ExitStatus =
ProcessBuilder(cmd).inheritIO().start().waitFor()
But the Kotlin code doesn't have any control when the sh are executing.
When you know how many times you want to write
fun executeNTimes(cmd: List<String>, times: Int) = runBlocking {
val process = ProcessBuilder(cmd)
.start()
launch { process.errorStream.bufferedReader().useLines { seq -> seq.toList().forEach { println("stderr: $it") } } }
launch { process.inputStream.bufferedReader().useLines { seq -> seq.toList().forEach { println("stdout: $it") } } }
OutputStreamWriter(process.outputStream, "UTF-8").use { w ->
repeat(times) {
readln().let { println("input: $it"); w.write(it) }
w.appendLine()
w.flush()
}
}
process.waitFor()
}
But that is not interactive!
> cmd = sh and times = 2:
echo exit on stdout
input: echo exit on stdout
echo exit on stderr 1>&2
input: echo exit on stderr 1>&2
stderr: exit on stderr
stdout: exit on stdout
Is not interactive because needs to close the buffer for starting to work.
My expectation for interactive process is the next one:
input: echo exit on stdout
stdout: exit on stdout
input: echo exit on stderr 1>&2
stderr: exit on stderr
input: exit
How I can do that?
答案1
得分: 0
以下是您要的翻译部分：
"After read:
The code has:
fun executeExpect() {
val process = ProcessBuilder(listOf("sh")).start()
val expect = ExpectBuilder()
.withInputs(process.inputStream, process.errorStream)
.withOutput(process.outputStream)
.build()
fun send(str: String) {
expect.sendLine(str)
println("input: $str")
}
"echo exit on stdout".let(::send)
expect.expect(regexp("\n$")).before.let { println("stdout: $it") }
"echo exit on stderr 1>&2".let(::send)
expect.expectIn(1, regexp("\n$")).before.let { println("stderr: $it") }
"exit".let(::send)
expect.expect(eof());
process.waitFor()
expect.close()
}
And now the output is:
input: echo exit on stdout
stdout: exit on stdout
input: echo exit on stderr 1>&2
stderr: exit on stderr
input: exit
```"
<details>
<summary>英文:</summary>
After read:
- https://github.com/agavrilov76/ExpectIt
- https://github.com/agavrilov76/ExpectIt/blob/master/expectit-core/src/test/java/net/sf/expectit/ProcessExample.java
- https://en.wikipedia.org/wiki/Expect
The code has:
```kotlin
fun executeExpect() {
val process = ProcessBuilder(listOf("sh")).start()
val expect = ExpectBuilder()
.withInputs(process.inputStream, process.errorStream)
.withOutput(process.outputStream)
.build()
fun send(str: String) {
expect.sendLine(str)
println("input: $str")
}
"echo exit on stdout".let(::send)
expect.expect(regexp("\n$")).before.let { println("stdout: $it") }
"echo exit on stderr 1>&2".let(::send)
expect.expectIn(1, regexp("\n$")).before.let { println("stderr: $it") }
"exit".let(::send)
expect.expect(eof());
process.waitFor()
expect.close()
}
And now the output is:
input: echo exit on stdout
stdout: exit on stdout
input: echo exit on stderr 1>&2
stderr: exit on stderr
input: exit
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