lson.core_2.11.0.9.71.source-code.process.scala Maven / Gradle / Ivy

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//: ----------------------------------------------------------------------------
//: Copyright (C) 2017 Verizon.  All Rights Reserved.
//:
//:   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 nelson

import scalaz.concurrent.Task

object process {
  /** True if a program is on the path */
  def isOnPath(program: String): Task[Boolean] =
    Task.delay {
      val pb = new ProcessBuilder("which", program)
      val proc = pb.start()
      proc.waitFor() == 0
    }
}