wip

dots/scripts/build.swift

@@ -0,0 +1,81 @@
+#!/usr/bin/env swift
+import Foundation
+
+try build()
+
+func build() throws {
+  try withVersion(in: "Sources/dots/Version.swift", as: currentVersion()) {
+    try foregroundShell(
+      "swift", "build",
+      "--disable-sandbox",
+      "--configuration", "release",
+      "-Xswiftc", "-cross-module-optimization"
+    )
+  }
+}
+
+func withVersion(in file: String, as version: String, _ closure: () throws -> ()) throws {
+  let fileURL = URL(fileURLWithPath: file)
+  let originalFileContents = try String(contentsOf: fileURL, encoding: .utf8)
+  // set version
+  try originalFileContents
+    .replacingOccurrences(of: "nil", with: "\"\(version)\"")
+    .write(to: fileURL, atomically: true, encoding: .utf8)
+  defer {
+    // undo set version
+    try! originalFileContents
+      .write(to: fileURL, atomically: true, encoding: .utf8)
+  }
+  // run closure
+  try closure()
+}
+
+func currentVersion() throws -> String {
+  do {
+    let tag = try backgroundShell("git", "describe", "--tags", "--exact-match")
+    return tag
+  } catch {
+    let branch = try backgroundShell("git", "symbolic-ref", "-q", "--short", "HEAD")
+    let commit = try backgroundShell("git", "rev-parse", "--short", "HEAD")
+    return "\(branch) (\(commit))"
+  }
+}
+
+func foregroundShell(_ args: String...) throws {
+  print("$", args.joined(separator: " "))
+  let task = Process()
+  task.launchPath = "/usr/bin/env"
+  task.arguments = args
+  task.launch()
+  task.waitUntilExit()
+  
+  guard task.terminationStatus == 0 else {
+    throw ShellError(terminationStatus: task.terminationStatus)
+  }
+}
+
+@discardableResult
+func backgroundShell(_ args: String...) throws -> String {
+  let task = Process()
+  task.launchPath = "/usr/bin/env"
+  task.arguments = args
+  // grab stdout
+  let output = Pipe()
+  task.standardOutput = output
+  // ignore stderr
+  let error = Pipe()
+  task.standardError = error
+  task.launch()
+  task.waitUntilExit()
+  
+  guard task.terminationStatus == 0 else {
+    throw ShellError(terminationStatus: task.terminationStatus)
+  }
+  
+  return String(decoding: output.fileHandleForReading.readDataToEndOfFile(), as: UTF8.self)
+    .trimmingCharacters(in: .whitespacesAndNewlines)
+}
+
+struct ShellError: Swift.Error {
+  var terminationStatus: Int32
+}