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package org.jetbrains
import org.gradle.api.tasks.AbstractExecTask
import org.gradle.internal.os.OperatingSystem
import java.io.File
import java.nio.file.Files
import java.nio.file.Path
import java.nio.file.Paths
open class CrossPlatformExec : AbstractExecTask<CrossPlatformExec>(CrossPlatformExec::class.java) {
private val windowsExtensions = listOf(".bat", ".cmd", ".exe")
private val unixExtensions = listOf("", ".sh")
private val isWindows = OperatingSystem.current().isWindows
override fun exec() {
val commandLine: MutableList<String> = this.commandLine
if (commandLine.isNotEmpty()) {
commandLine[0] = findCommand(commandLine[0])
}
if (isWindows && commandLine.isNotEmpty() && commandLine[0].isNotBlank()) {
this.commandLine = listOf("cmd", "/c") + commandLine
} else {
this.commandLine = commandLine
}
super.exec()
}
private fun findCommand(command: String): String {
val normalizedCommand = normalizeCommandPaths(command)
val extensions = if (isWindows) windowsExtensions else unixExtensions
return extensions.map { extension ->
resolveCommandFromFile(Paths.get("$normalizedCommand$extension"))
}.firstOrNull { it.isNotBlank() } ?: normalizedCommand
}
private fun resolveCommandFromFile(commandFile: Path) =
if (!Files.isExecutable(commandFile)) {
""
} else {
commandFile.toAbsolutePath().normalize().toString()
}
private fun normalizeCommandPaths(command: String): String {
// need to escape backslash so it works with regex
val backslashSeparator = "\\"
val forwardSlashSeparator = "/"
// get the actual separator
val separator = if (File.separatorChar == '\\') backslashSeparator else File.separator
return command
// first replace all of the backslashes with forward slashes
.replace(backslashSeparator, forwardSlashSeparator)
// then replace all forward slashes with whatever the separator actually is
.replace(forwardSlashSeparator, separator)
}
}
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