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November 19, 2021 05:25
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Run shell commands from android app with kotlin
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/* | |
* Copyright (C) 2021 Jared Rummler | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package com.jaredrummler.ktsh | |
import com.jaredrummler.ktsh.Shell.Command | |
import java.io.* | |
import java.util.* | |
import java.util.concurrent.CountDownLatch | |
import java.util.concurrent.TimeUnit | |
import java.util.concurrent.locks.ReentrantLock | |
import java.util.regex.Pattern | |
/** Environment variable. */ | |
typealias Variable = String | |
/** Environment variable value. */ | |
typealias Value = String | |
/** A [Map] for the environment variables used in the shell. */ | |
typealias EnvironmentMap = Map<Variable, Value> | |
/** | |
* A shell starts a [Process] with the provided shell and additional/optional environment variables. | |
* The shell handles maintaining the [Process] and reads standard output and standard error streams, | |
* returning stdout, stderr, and the last exit code as a [Command.Result] when a command is complete. | |
* | |
* Example usage: | |
* | |
* val sh = Shell("sh") | |
* val result = sh.run("echo 'Hello, World!'") | |
* assert(result.isSuccess) | |
* assert(result.stdout() == "Hello, World") | |
* | |
* @property path The path to the shell to start. | |
* @property environment Map of all environment variables to include with the system environment. | |
* Default value is an empty map. | |
* @throws Shell.NotFoundException If the shell cannot be opened this runtime exception is thrown. | |
* @author Jared Rummler (jaredrummler@gmail.com) | |
* @since 05-05-2021 | |
*/ | |
class Shell @Throws(NotFoundException::class) @JvmOverloads constructor( | |
val path: String, | |
val environment: EnvironmentMap = emptyMap() | |
) { | |
/** | |
* Construct a new [Shell] with optional environment variable arguments as a [Pair]. | |
* | |
* @param shell The path to the shell to start. | |
* @param environment varargs of all environment variables as a [Pair] which are included | |
* with the system environment. | |
*/ | |
constructor(shell: String, vararg environment: Pair<Variable, Value>) : | |
this(shell, environment.toEnvironmentMap()) | |
/** | |
* Construct a new [Shell] with optional environment variable arguments as an array. | |
* | |
* @param shell The path to the shell to start. | |
* @param environment varargs of all environment variables as a [Pair] which are included | |
* with the system environment. | |
*/ | |
constructor(shell: String, environment: Array<String>) : | |
this(shell, environment.toEnvironmentMap()) | |
/** | |
* Get the current state of the shell | |
*/ | |
var state: State = State.Idle | |
private set | |
private val onResultListeners = mutableSetOf<OnCommandResultListener>() | |
private val onStdOutListeners = mutableSetOf<OnLineListener>() | |
private val onStdErrListeners = mutableSetOf<OnLineListener>() | |
private val stdin: StandardInputStream | |
private val stdoutReader: StreamReader | |
private val stderrReader: StreamReader | |
private var watchdog: Watchdog? = null | |
private val process: Process | |
init { | |
try { | |
process = runWithEnv(path, environment) | |
stdin = StandardInputStream(process.outputStream) | |
stdoutReader = StreamReader.createAndStart(THREAD_NAME_STDOUT, process.inputStream) | |
stderrReader = StreamReader.createAndStart(THREAD_NAME_STDERR, process.errorStream) | |
} catch (cause: Exception) { | |
throw NotFoundException(String.format(EXCEPTION_SHELL_CANNOT_OPEN, path), cause) | |
} | |
} | |
/** | |
* Add a listener that will be invoked each time a command finishes. | |
* | |
* @param listener The listener to receive callbacks when commands finish executing. | |
* @return This shell instance for chaining calls. | |
*/ | |
fun addOnCommandResultListener(listener: OnCommandResultListener) = apply { | |
onResultListeners.add(listener) | |
} | |
/** | |
* Remove a listener previously added to stop receiving callbacks when commands finish. | |
* | |
* @param listener The listener registered via [addOnCommandResultListener]. | |
* @return This shell instance for chaining calls. | |
*/ | |
fun removeOnCommandResultListener(listener: OnCommandResultListener) = apply { | |
onResultListeners.remove(listener) | |
} | |
/** | |
* Add a listener that will be invoked each time the STDOUT stream reads a new line. | |
* | |
* @param listener The listener to receive callbacks when the STDOUT stream reads a line. | |
* @return This shell instance for chaining calls. | |
*/ | |
fun addOnStdoutLineListener(listener: OnLineListener) = apply { | |
onStdOutListeners.add(listener) | |
} | |
/** | |
* Remove a listener previously added to stop receiving callbacks for STDOUT read lines. | |
* | |
* @param listener The listener registered via [addOnStdoutLineListener]. | |
* @return This shell instance for chaining calls. | |
*/ | |
fun removeOnStdoutLineListener(listener: OnLineListener) = apply { | |
onStdOutListeners.remove(listener) | |
} | |
/** | |
* Add a listener that will be invoked each time the STDERR stream reads a new line. | |
* | |
* @param listener The listener to receive callbacks when the STDERR stream reads a line. | |
* @return This shell instance for chaining calls. | |
*/ | |
fun addOnStderrLineListener(listener: OnLineListener) = apply { | |
onStdErrListeners.add(listener) | |
} | |
/** | |
* Remove a listener previously added to stop receiving callbacks for STDERR read lines. | |
* | |
* @param listener The listener registered via [addOnStderrLineListener]. | |
* @return This shell instance for chaining calls. | |
*/ | |
fun removeOnStderrLineListener(listener: OnLineListener) = apply { | |
onStdErrListeners.remove(listener) | |
} | |
/** | |
* Run a command in the current shell and return its [result][Command.Result]. | |
* | |
* @param command The command to execute. | |
* @param config The [options][Command.Config] to set when running the command. | |
* @return The [result][Command.Result] containing stdout, stderr, status of running the command. | |
* @throws ClosedException if the shell was closed prior to running the command. | |
* @see shutdown | |
* @see run | |
*/ | |
@Throws(ClosedException::class) | |
@Synchronized | |
fun run( | |
command: String, | |
config: Command.Config.Builder.() -> Unit, | |
) = run(command, Command.Config.Builder().apply(config).create()) | |
/** | |
* Run a command in the current shell and return its [result][Command.Result]. | |
* | |
* @param command The command to execute. | |
* @param config The [options][Command.Config] to set when running the command. | |
* @return The [result][Command.Result] containing stdout, stderr, status of running the command. | |
* @throws ClosedException if the shell was closed prior to running the command. | |
* @see shutdown | |
* @see run | |
*/ | |
@Throws(ClosedException::class) | |
@Synchronized | |
@JvmOverloads | |
fun run( | |
command: String, | |
config: Command.Config = Command.Config.default(), | |
): Command.Result { | |
// If the shell is shutdown, throw a ShellClosedException. | |
if (state == State.Shutdown) throw ClosedException(EXCEPTION_SHELL_SHUTDOWN) | |
val stdout = Collections.synchronizedList(mutableListOf<String>()) | |
val stderr = Collections.synchronizedList(mutableListOf<String>()) | |
val watchdog = Watchdog().also { watchdog = it } | |
var exitCode = Command.Status.INVALID | |
val uuid = config.uuid | |
val onComplete = { marker: Command.Marker -> | |
when (marker.uuid) { | |
uuid -> | |
try { // Reached the end of reading the stream for the command. | |
if (marker.status != Command.Status.INVALID) { | |
exitCode = marker.status | |
} | |
} finally { | |
watchdog.signal() | |
} | |
} | |
} | |
val lock = ReentrantLock() | |
val output = Collections.synchronizedList(mutableListOf<String>()) | |
// Function to process stderr and stdout streams. | |
fun onLine( | |
buffer: MutableList<String>, | |
listeners: Set<OnLineListener>, | |
onLine: (line: String) -> Unit, | |
) = { line: String -> | |
try { | |
lock.lock() | |
if (config.notify) { | |
listeners.forEach { listener -> listener.onLine(line) } | |
} | |
buffer.add(line) | |
output.add(line) | |
onLine(line) | |
} finally { | |
lock.unlock() | |
} | |
} | |
stdoutReader.onComplete = onComplete | |
stderrReader.onComplete = onComplete | |
stdoutReader.onReadLine = onLine(stdout, onStdOutListeners, config.onStdOut) | |
stderrReader.onReadLine = when (config.redirectStdErr) { | |
true -> onLine(stdout, onStdOutListeners, config.onStdOut) | |
else -> onLine(stderr, onStdErrListeners, config.onStdErr) | |
} | |
val startTime = System.currentTimeMillis() | |
try { | |
state = State.Running | |
// Write the command and command end marker to stdin. | |
write(command, "echo '$uuid' $?", "echo '$uuid' >&2") | |
// Wait for the result with a timeout, if provided. | |
if (!watchdog.await(config.timeout)) { | |
exitCode = Command.Status.TIMEOUT | |
config.onTimeout() | |
} | |
} catch (e: InterruptedException) { | |
exitCode = Command.Status.TERMINATED | |
config.onCancelled() | |
} finally { | |
this.watchdog = null | |
state = State.Idle | |
} | |
if (exitCode != Command.Status.SUCCESS) { | |
// Exit with the error code in a subshell | |
// This is necessary because we send commands to signal a command was completed | |
write("$(exit $exitCode)") | |
} | |
// Create the result from running the command. | |
val result = Command.Result.create( | |
uuid, | |
command, | |
stdout, | |
stderr, | |
output, | |
exitCode, | |
startTime | |
) | |
if (config.notify) { | |
onResultListeners.forEach { listener -> | |
listener.onResult(result) | |
} | |
} | |
return result | |
} | |
/** | |
* Check if the shell is idle. | |
* | |
* @return True if the shell is open but not running any commands. | |
*/ | |
fun isIdle() = state is State.Idle | |
/** | |
* Check if the shell is running a command. | |
* | |
* @return True if the shell is executing a command. | |
*/ | |
fun isRunning() = state is State.Running | |
/** | |
* Check if the shell is shutdown. | |
* | |
* @return True if the shell is closed. | |
* @see shutdown | |
*/ | |
fun isShutdown() = state is State.Shutdown | |
/** | |
* Check if the shell is alive and able to execute commands. | |
* | |
* @return True if the shell is running or idle. | |
*/ | |
fun isAlive() = try { | |
process.exitValue(); false | |
} catch (e: IllegalThreadStateException) { | |
true | |
} | |
/** | |
* Interrupt waiting for a command to complete. | |
*/ | |
fun interrupt() { | |
watchdog?.abort() | |
} | |
/** | |
* Shutdown the shell instance. After a shell is shutdown it can no longer execute commands | |
* and should be garbage collected. | |
*/ | |
@Synchronized | |
fun shutdown() { | |
try { | |
write("exit") | |
process.waitFor() | |
stdin.closeQuietly() | |
onStdOutListeners.clear() | |
onStdErrListeners.clear() | |
stdoutReader.join() | |
stderrReader.join() | |
process.destroy() | |
} catch (ignored: IOException) { | |
} finally { | |
state = State.Shutdown | |
} | |
} | |
private fun write(vararg commands: String) = try { | |
commands.forEach { command -> stdin.write(command) } | |
stdin.flush() | |
} catch (ignored: IOException) { | |
} | |
private fun DataOutputStream.closeQuietly() = try { | |
close() | |
} catch (ignored: IOException) { | |
} | |
/** | |
* Contains data classes used for running commands in a [Shell]. | |
* | |
* @see Command.Result | |
* @see Command.Config | |
* @see Command.Status | |
*/ | |
object Command { | |
/** | |
* The result of running a command in a shell. | |
* | |
* @property stdout A list of lines read from the standard input stream. | |
* @property stderr A list of lines read from the standard error stream. | |
* @property exitCode The status code of running the command. | |
* @property details Additional command result details. | |
*/ | |
data class Result( | |
val stdout: List<String>, | |
val stderr: List<String>, | |
val output: List<String>, | |
val exitCode: Int, | |
val details: Details | |
) { | |
/** | |
* True when the exit code is equal to 0. | |
*/ | |
val isSuccess: Boolean get() = exitCode == Status.SUCCESS | |
/** | |
* Get [stdout] and [stderr] as a string, separated by new lines. | |
* | |
* @return The output of running the command in a shell. | |
*/ | |
fun output(): String = output.joinToString("\n") | |
/** | |
* Get [stdout] as a string, separated by new lines. | |
* | |
* @return The standard ouput string. | |
*/ | |
fun stdout(): String = stdout.joinToString("\n") | |
/** | |
* Get [stdout] as a string, separated by new lines. | |
* | |
* @return The standard ouput string. | |
*/ | |
fun stderr(): String = stderr.joinToString("\n") | |
/** | |
* Additional details pertaining to running a command in a shell. | |
* | |
* @property uuid The unique identifier associated with the command. | |
* @property command The command sent to the shell to execute. | |
* @property startTime The time—in milliseconds since January 1, 1970, 00:00:00 GMT—when | |
* the command started execution. | |
* @property endTime The time—in milliseconds since January 1, 1970, 00:00:00 GMT—when | |
* the command completed execution. | |
* @property elapsed The number of milliseconds it took to execute the command. | |
*/ | |
data class Details internal constructor( | |
val uuid: UUID, | |
val command: String, | |
val startTime: Long, | |
val endTime: Long, | |
val elapsed: Long = endTime - startTime | |
) | |
companion object { | |
internal fun create( | |
uuid: UUID, | |
command: String, | |
stdout: List<String>, | |
stderr: List<String>, | |
output: List<String>, | |
exitCode: Int, | |
startTime: Long, | |
endTime: Long = System.currentTimeMillis(), | |
) = Result( | |
stdout, | |
stderr, | |
output, | |
exitCode, | |
Details(uuid, command, startTime, endTime) | |
) | |
} | |
} | |
/** | |
* Optional configuration settings when running a command in a [shell][Shell]. | |
* | |
* @property uuid The unique identifier associated with the command. | |
* @property redirectStdErr True to redirect STDERR to STDOUT. | |
* @property onStdOut Callback that is invoked when reading a line from stdout. | |
* @property onStdErr Callback that is invoked when reading a line from stderr. | |
* @property onCancelled Callback that is invoked when the command is interrupted. | |
* @property onTimeout Callback that is invoked when the command timed-out. | |
* @property timeout The time to wait before killing the command. | |
* @property notify True to notify any [OnLineListener] and [OnCommandResultListener] of the command. | |
*/ | |
class Config private constructor( | |
val uuid: UUID = UUID.randomUUID(), | |
val redirectStdErr: Boolean = false, | |
val onStdOut: (line: String) -> Unit = {}, | |
val onStdErr: (line: String) -> Unit = {}, | |
val onCancelled: () -> Unit = {}, | |
val onTimeout: () -> Unit = {}, | |
val timeout: Timeout? = null, | |
val notify: Boolean = true | |
) { | |
/** | |
* Optional configuration settings when running a command in a [shell][Shell]. | |
* | |
* @property uuid The unique identifier associated with the command. | |
* @property redirectErrorStream True to redirect STDERR to STDOUT. | |
* @property onStdOut Callback that is invoked when reading a line from stdout. | |
* @property onStdErr Callback that is invoked when reading a line from stderr. | |
* @property onCancelled Callback that is invoked when the command is interrupted. | |
* @property onTimeout Callback that is invoked when the command timed-out. | |
* @property timeout The time to wait before killing the command. | |
* @property notify True to notify any [OnLineListener] and [OnCommandResultListener] of the command. | |
*/ | |
class Builder { | |
var uuid: UUID = UUID.randomUUID() | |
var redirectErrorStream = false | |
var onStdOut: (line: String) -> Unit = {} | |
var onStdErr: (line: String) -> Unit = {} | |
var onCancelled: () -> Unit = {} | |
var onTimeout: () -> Unit = {} | |
var timeout: Timeout? = null | |
var notify = true | |
/** | |
* Create the [Config] from this builder. | |
* | |
* @return A new [Config] for a command. | |
*/ | |
fun create() = | |
Config( | |
uuid, | |
redirectErrorStream, | |
onStdOut, | |
onStdErr, | |
onCancelled, | |
onTimeout, | |
timeout, | |
notify | |
) | |
} | |
companion object { | |
/** | |
* The default configuration for running a command in a shell. | |
* | |
* @return The default config. | |
*/ | |
fun default(): Config = Builder().create() | |
/** | |
* Config that doesn't invoke callbacks for line and command complete listeners. | |
*/ | |
fun silent(): Config = Builder().apply { notify = false }.create() | |
} | |
} | |
/** | |
* The command marker to process standard input/error streams. | |
* | |
* @property uuid The unique ID for a command. | |
* @property status the exit code for the last run command. | |
*/ | |
internal data class Marker(val uuid: UUID, val status: Int) | |
/** Exit codes */ | |
object Status { | |
/** OK exit code value */ | |
const val SUCCESS = 0 | |
/** Command timeout exit status */ | |
const val TIMEOUT = 124 | |
/** Command failed exit status */ | |
const val COMMAND_FAILED = 125 | |
/** Command not executable exit status */ | |
const val NOT_EXECUTABLE = 126 | |
/** Command not found exit status */ | |
const val NOT_FOUND = 127 | |
/** Command terminated exit status. */ | |
const val TERMINATED = 128 + 30 | |
internal const val INVALID = 0x100 | |
} | |
} | |
/** | |
* Interface to receive a callback when reading a line from standard output/error streams. | |
*/ | |
interface OnLineListener { | |
/** | |
* Called when a line was read from standard output/error streams | |
* | |
* @param line The string that was read. | |
*/ | |
fun onLine(line: String) | |
} | |
/** | |
* Interface to receive a callback when a command completes. | |
*/ | |
interface OnCommandResultListener { | |
/** | |
* Called when a command finishes running. | |
* | |
* @param result The result of running the command in a shell. | |
*/ | |
fun onResult(result: Command.Result) | |
} | |
/** | |
* A timeout used when running a command in a shell. | |
* | |
* @property value The value of the time based on the [unit]. | |
* @property unit The time unit for the [value]. | |
*/ | |
data class Timeout(val value: Long, val unit: TimeUnit) | |
/** | |
* The exception thrown when a command is passed to a closed shell. | |
*/ | |
class ClosedException(message: String) : IOException(message) | |
/** | |
* The exception thrown when the shell could not be opened. | |
*/ | |
class NotFoundException(message: String, cause: Throwable) : RuntimeException(message, cause) | |
/** | |
* Represents the possible states of the shell. | |
*/ | |
sealed class State { | |
/** The shell is idle; no commands are in progress. */ | |
object Idle : State() | |
/** The shell is currently running a command. */ | |
object Running : State() | |
/** The shell has been shutdown. */ | |
object Shutdown : State() | |
} | |
/** | |
* A class to cause the current thread to wait until a command completes or is aborted. | |
*/ | |
private class Watchdog : CountDownLatch(STREAM_READER_COUNT) { | |
private var aborted = false | |
/** | |
* Releases the thread immediately instead of waiting for [signal] to be invoked twice. | |
*/ | |
fun abort() { | |
if (count == 0L) return | |
aborted = true | |
while (count > 0) countDown() | |
} | |
/** | |
* Signal that either standard output or standard input streams are finished processing. | |
*/ | |
fun signal() = countDown() | |
/** | |
* Causes the current thread to wait until [signal] is called twice. | |
* | |
* @param timeout The maximum time to wait before [AbortedException] is thrown. | |
* @throws AbortedException if the timeout completes before [signal] is called twice | |
* or if the thread is interrupted. | |
*/ | |
@Throws(AbortedException::class) | |
fun await(timeout: Timeout?): Boolean { | |
return when (timeout) { | |
null -> { | |
await(); true | |
} | |
else -> await(timeout.value, timeout.unit) | |
} | |
} | |
override fun await() = super.await().also { | |
if (aborted) throw AbortedException() | |
} | |
override fun await(timeout: Long, unit: TimeUnit) = super.await(timeout, unit).also { | |
if (aborted) throw AbortedException() | |
} | |
companion object { | |
/** | |
* The number of times [signal] should be called to release the latch. | |
*/ | |
private const val STREAM_READER_COUNT = 2 | |
/** | |
* The exception thrown when [abort] is called and the [CountDownLatch] has not finished | |
*/ | |
class AbortedException : InterruptedException() | |
} | |
} | |
/** | |
* The [OutputStream] for writing commands to the shell. | |
*/ | |
private class StandardInputStream(stream: OutputStream) : DataOutputStream(stream) { | |
/** | |
* The helper function to write commands to the stream with an appended new line character. | |
* | |
* @param command The command to write. | |
*/ | |
fun write(command: String) = write("$command\n".toByteArray(Charsets.UTF_8)) | |
} | |
/** | |
* A thread that parses the standard/error streams for the shell. | |
* | |
* @param name The name of the stream. One of: [THREAD_NAME_STDOUT], [THREAD_NAME_STDERR] | |
* @param stream Either the [Process.getInputStream] or [Process.getErrorStream] | |
*/ | |
private class StreamReader private constructor( | |
name: String, | |
private val stream: InputStream | |
) : Thread(name) { | |
/** | |
* The lambda that is invoked when a line is read from the stream. | |
*/ | |
var onReadLine: (line: String) -> Unit = {} | |
/** | |
* The lambda that is invoked when a command completes. | |
*/ | |
var onComplete: (marker: Command.Marker) -> Unit = {} | |
override fun run() = BufferedReader(InputStreamReader(stream)).forEachLine { line -> | |
pattern.matcher(line).let { matcher -> | |
if (matcher.matches()) { | |
val uuid = UUID.fromString(matcher.group(GROUP_UUID)) | |
onComplete( | |
when (val exitCode = matcher.group(GROUP_CODE)) { | |
null -> Command.Marker(uuid, Command.Status.INVALID) | |
else -> Command.Marker(uuid, exitCode.toInt()) | |
} | |
) | |
} else { | |
onReadLine(line) | |
} | |
} | |
} | |
companion object { | |
private const val GROUP_UUID = 1 | |
private const val GROUP_CODE = 2 | |
// <UUID><optional space><optional exit status> | |
private val pattern: Pattern = Pattern.compile( | |
"^([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12})\\s?([0-9]{1,3})?$", | |
Pattern.CASE_INSENSITIVE | |
) | |
internal fun createAndStart(name: String, stream: InputStream) = | |
StreamReader(name, stream).also { reader -> reader.start() } | |
} | |
} | |
companion object { | |
private const val THREAD_NAME_STDOUT = "STDOUT" | |
private const val THREAD_NAME_STDERR = "STDERR" | |
private const val EXCEPTION_SHELL_CANNOT_OPEN = "Error opening shell: '%s'" | |
private const val EXCEPTION_SHELL_SHUTDOWN = "The shell is shutdown" | |
private val instances by lazy { mutableMapOf<String, Shell>() } | |
/** | |
* Returns a [Shell] instance using the [path] as the path to the shell/executable.\ | |
*/ | |
operator fun get(path: String): Shell = instances[path]?.takeIf { shell -> | |
shell.isAlive() | |
} ?: Shell(path).also { shell -> | |
instances[path] = shell | |
} | |
/** The Bourne shell (sh) */ | |
val SH: Shell get() = this["sh"] | |
/** Switch to root, and run it as a shell */ | |
val SU: Shell get() = this["su"] | |
/** | |
* Execute a command with the provided environment. | |
* | |
* @param command | |
* The name of the program to execute. E.g. "su" or "sh". | |
* @param environment | |
* Map of all environment variables to include with the system environment. | |
* @return The new [Process] instance. | |
* @throws IOException | |
* If the requested program could not be executed. | |
*/ | |
@Throws(IOException::class) | |
private fun runWithEnv(command: String, environment: EnvironmentMap): Process = | |
Runtime.getRuntime().exec(command, (System.getenv() + environment).toArray()) | |
/** | |
* Convert an array to an [EnvironmentMap] with each variable/value separated by '='. | |
* | |
* @return The array converted to an [EnvironmentMap]. | |
*/ | |
private fun Array<out String>.toEnvironmentMap(): EnvironmentMap = | |
mutableMapOf<Variable, Value>().also { map -> | |
forEach { str -> | |
str.split("=").takeIf { arr -> | |
arr.size == 2 | |
}?.let { (variable, value) -> | |
map[variable] = value | |
} | |
} | |
}.toMap() | |
/** | |
* Convert an array of [Pair] to an [EnvironmentMap]. | |
* | |
* @return The array of variable/value pairs as a new [EnvironmentMap]. | |
*/ | |
private fun Array<out Pair<Variable, Value>>.toEnvironmentMap(): EnvironmentMap = | |
mutableMapOf<Variable, Value>().also { map -> | |
forEach { (variable, value) -> | |
map[variable] = value | |
} | |
} | |
/** | |
* Converts an [EnvironmentMap] to an array of strings with the variable/value | |
* separated by an '=' character. | |
* | |
* @return An array of environment variables. | |
*/ | |
private fun EnvironmentMap.toArray(): Array<String> = | |
mutableListOf<String>().also { list -> | |
forEach { (variable, value) -> | |
list.add("$variable=$value") | |
} | |
}.toTypedArray() | |
} | |
} |
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