Initial Commit

.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

.swiftpm/xcode/package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Package.swift

@@ -0,0 +1,24 @@
+// swift-tools-version:5.5
+
+import PackageDescription
+
+let package = Package(
+    name: "ViewModifierBuilder",
+    platforms: [
+      .iOS(.v13),
+      .macOS(.v10_15),
+      .tvOS(.v13),
+      .watchOS(.v6)
+    ],
+    products: [
+        .library(
+            name: "ViewModifierBuilder",
+            targets: ["ViewModifierBuilder"]),
+    ],
+    targets: [
+        .target(
+            name: "ViewModifierBuilder",
+            dependencies: [],
+            path: "Sources")
+    ]
+)

README.md

@@ -0,0 +1,5 @@
+# ViewModifierBuilder
+
+[![Swift Package Manager](https://img.shields.io/badge/Swift_Package_Manager-compatible-orange?style=flat-square)](https://img.shields.io/badge/Swift_Package_Manager-compatible-orange?style=flat-square)
+
+A [result builder](https://github.com/apple/swift-evolution/blob/main/proposals/0289-result-builders.md) for [ViewModifiers](https://developer.apple.com/documentation/swiftui/viewmodifier/).

Sources/Documentation.docc/Documentation.md

@@ -0,0 +1,24 @@
+# ``ViewModifierBuilder``
+
+A custom parameter attribute that concatenates many [`ViewModifers`](https://developer.apple.com/documentation/swiftui/viewmodifier).
+
+## Topics
+
+### Applying Modifications
+- ``ViewModifierBuilder/ApplyViewModifiers``
+
+### Building Modifications
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock()``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:_:_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:_:_:_:_:_:)``
+- ``ViewModifierBuilder/ViewModifierBuilder/buildBlock(_:_:_:_:_:_:_:_:_:_:)``
+
+### Supporting Types
+- ``ViewModifierBuilder/ViewModifierBuilder``

Sources/View+Modifiers.swift

@@ -0,0 +1,13 @@
+import SwiftUI
+
+extension View {
+  /// Applies a set of modifiers to a view and returns a new view.
+  ///
+  /// - Parameters
+  ///   - modifiers: closure returning a modifier
+  public func modifiers<Modifiers>(@ViewModifierBuilder _ modifiers: () -> Modifiers) -> some View
+  where Modifiers: ViewModifier {
+    modifier(ApplyViewModifiers(modifiers))
+  }
+}
+

Sources/ViewModifierBuilder.swift

@@ -0,0 +1,92 @@
+import SwiftUI
+
+/// A custom parameter attribute that concats many ViewModifers.
+@resultBuilder public enum ViewModifierBuilder {
+
+  /// Builds an empty ViewModifer from a block containing no statements.
+  @inlinable public static func buildBlock() -> EmptyModifier {
+    EmptyModifier()
+  }
+
+  /// Passes a single view written as a child view through unmodified.
+  @inlinable public static func buildBlock<Modifier>(_ modifier: Modifier) -> Modifier
+  where Modifier: ViewModifier {
+    modifier
+  }
+
+  @inlinable public static func buildBlock<M0, M1>(_ m0: M0, _ m1: M1) -> some ViewModifier
+  where M0: ViewModifier, M1: ViewModifier {
+    m0.concat(m1)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2>(_ m0: M0, _ m1: M1, _ m2: M2)
+    -> some ViewModifier where M0: ViewModifier, M1: ViewModifier, M2: ViewModifier
+  {
+    m0.concat(m1).concat(m2)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3>(_ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3)
+    -> some ViewModifier
+  where M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier {
+    m0.concat(m1).concat(m2).concat(m3)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3, M4>(
+    _ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3, _ m4: M4
+  ) -> some ViewModifier
+  where M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier, M4: ViewModifier {
+    m0.concat(m1).concat(m2).concat(m3).concat(m4)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3, M4, M5>(
+    _ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3, _ m4: M4, _ m5: M5
+  ) -> some ViewModifier
+  where
+    M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier, M4: ViewModifier,
+    M5: ViewModifier
+  {
+    m0.concat(m1).concat(m2).concat(m3).concat(m4).concat(m5)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3, M4, M5, M6>(
+    _ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3, _ m4: M4, _ m5: M5, _ m6: M6
+  ) -> some ViewModifier
+  where
+    M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier, M4: ViewModifier,
+    M5: ViewModifier, M6: ViewModifier
+  {
+    m0.concat(m1).concat(m2).concat(m3).concat(m4).concat(m5).concat(m6)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3, M4, M5, M6, M7>(
+    _ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3, _ m4: M4, _ m5: M5, _ m6: M6, _ m7: M7
+  ) -> some ViewModifier
+  where
+    M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier, M4: ViewModifier,
+    M5: ViewModifier, M6: ViewModifier, M7: ViewModifier
+  {
+    m0.concat(m1).concat(m2).concat(m3).concat(m4).concat(m5).concat(m6).concat(m7)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3, M4, M5, M6, M7, M8>(
+    _ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3, _ m4: M4, _ m5: M5, _ m6: M6, _ m7: M7, _ m8: M8
+  ) -> some ViewModifier
+  where
+    M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier, M4: ViewModifier,
+    M5: ViewModifier, M6: ViewModifier, M7: ViewModifier, M8: ViewModifier
+  {
+    m0.concat(m1).concat(m2).concat(m3).concat(m4).concat(m5).concat(m6).concat(m7).concat(m8)
+  }
+
+  @inlinable public static func buildBlock<M0, M1, M2, M3, M4, M5, M6, M7, M8, M9>(
+    _ m0: M0, _ m1: M1, _ m2: M2, _ m3: M3, _ m4: M4, _ m5: M5, _ m6: M6, _ m7: M7, _ m8: M8,
+    _ m9: M9
+  ) -> some ViewModifier
+  where
+    M0: ViewModifier, M1: ViewModifier, M2: ViewModifier, M3: ViewModifier, M4: ViewModifier,
+    M5: ViewModifier, M6: ViewModifier, M7: ViewModifier, M8: ViewModifier, M9: ViewModifier
+  {
+    m0.concat(m1).concat(m2).concat(m3).concat(m4).concat(m5).concat(m6).concat(m7).concat(m8)
+      .concat(m9)
+  }
+}

Sources/ViewModifiersViewModifier.swift

@@ -0,0 +1,18 @@
+import SwiftUI
+
+/// Applies set of modifiers to a view and returns a new view.
+public struct ApplyViewModifiers<Modifiers>: ViewModifier where Modifiers: ViewModifier {
+  private let modifiers: Modifiers
+
+  /// Structure to apply a set of modifiers to a view.
+  ///
+  /// - Parameters
+  ///   - modifiers: closure returning a modifier
+  public init(@ViewModifierBuilder _ modifiers: () -> Modifiers) {
+    self.modifiers = modifiers()
+  }
+
+  public func body(content: Content) -> some View {
+    content.modifier(modifiers)
+  }
+}