Add symbolGraphMinimumAccessLevel option support (#82)

* Add symbolGraphMinimumAccessLevel option support

* Remove experimental prefix

* Fix CR suggestion

Plugins/SharedPackagePluginExtensions/PackageManager+getSymbolGraphsForDocC.swift

@@ -39,13 +39,17 @@ extension PackageManager {
         context: PluginContext,
         verbose: Bool,
         snippetExtractor: SnippetExtractor?,
-        customSymbolGraphOptions: [PluginFlag]
+        customSymbolGraphOptions: [PluginFlag],
+        minimumAccessLevel: SymbolGraphOptions.AccessLevel? = nil
     ) throws -> DocCSymbolGraphResult {
         // First generate the primary symbol graphs containing information about the
         // symbols defined in the target itself.
 
         var symbolGraphOptions = target.defaultSymbolGraphOptions(in: context.package)
-
+        if let minimumAccessLevel {
+            symbolGraphOptions.minimumAccessLevel = minimumAccessLevel
+        }
+
         // Modify the symbol graph options with the custom ones
         for customSymbolGraphOption in customSymbolGraphOptions {
             switch customSymbolGraphOption {

Plugins/Swift-DocC Convert/SwiftDocCConvert.swift

@@ -79,7 +79,8 @@ import PackagePlugin
                 context: context,
                 verbose: verbose,
                 snippetExtractor: snippetExtractor,
-                customSymbolGraphOptions: parsedArguments.symbolGraphArguments
+                customSymbolGraphOptions: parsedArguments.symbolGraphArguments,
+                minimumAccessLevel: parsedArguments.arguments.symbolGraphMinimumAccessLevel.flatMap { .init(rawValue: $0) }
             )
 
             if target.doccCatalogPath == nil,

Plugins/Swift-DocC Preview/SwiftDocCPreview.swift

@@ -84,7 +84,8 @@ import PackagePlugin
             context: context,
             verbose: verbose,
             snippetExtractor: snippetExtractor,
-            customSymbolGraphOptions: parsedArguments.symbolGraphArguments
+            customSymbolGraphOptions: parsedArguments.symbolGraphArguments,
+            minimumAccessLevel: parsedArguments.arguments.symbolGraphMinimumAccessLevel.flatMap { .init(rawValue: $0) }
         )
 
         if try FileManager.default.contentsOfDirectory(atPath: symbolGraphs.targetSymbolGraphsDirectory.path).isEmpty {

Sources/SwiftDocCPluginUtilities/Arguments+symbolGraphMinimumAccessLevel.swift

@@ -0,0 +1,27 @@
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2022 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for Swift project authors
+
+import Foundation
+
+extension Arguments {
+    /// The symbol graph minimum access level, if any, described by this set of command-line arguments.
+    public var symbolGraphMinimumAccessLevel: String? {
+        guard let accessLevelOptionIndex = firstIndex(
+            where: { argument in
+                return CommandLineOption.symbolGraphMinimumAccessLevel.possibleNames.contains(argument)
+            }
+        ) else {
+            return nil
+        }
+        let accessLevelIndex = index(after: accessLevelOptionIndex)
+        guard indices.contains(accessLevelIndex) else {
+            return nil
+        }
+        return self[accessLevelIndex]
+    }
+}

Sources/SwiftDocCPluginUtilities/CommandLineOptions/CommandLineOption.swift

@@ -60,7 +60,7 @@ extension CommandLineOption {
         defaultName: "--fallback-default-module-kind"
     )
 
-    /// A DocC flag that enables support for linking to other DocC archives and enables 
+    /// A DocC flag that enables support for linking to other DocC archives and enables
     /// other documentation builds to link to the generated DocC archive.
     static let enableExternalLinkSupport = CommandLineOption(
         defaultName: "--enable-experimental-external-link-support"
@@ -70,4 +70,9 @@ extension CommandLineOption {
     static let externalLinkDependency = CommandLineOption(
         defaultName: "--dependency"
     )
+
+    /// Specifies the symbol graph minimum access level.
+    static let symbolGraphMinimumAccessLevel = CommandLineOption(
+        defaultName: "--symbol-graph-minimum-access-level"
+    )
 }

Tests/SwiftDocCPluginUtilitiesTests/ArgumentsSymbolGraphMinimumAccessLevelTests.swift

@@ -0,0 +1,46 @@
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for Swift project authors
+
+import Foundation
+import SwiftDocCPluginUtilities
+import XCTest
+
+final class ArgumentsSymbolGraphMinimumAccessLevelTests: XCTestCase {
+    func testArgumentsThatContainAccessLevel() {
+        XCTAssertEqual(
+            Arguments(["--symbol-graph-minimum-access-level", "internal"]).symbolGraphMinimumAccessLevel,
+            "internal"
+        )
+
+        XCTAssertEqual(
+            Arguments(["other-arg", "--symbol-graph-minimum-access-level", "internal", "--other-flag"]).symbolGraphMinimumAccessLevel,
+            "internal"
+        )
+    }
+
+    func testArgumentsThatDoNotContainAccessLevel() {
+        XCTAssertNil(
+            Arguments(["--other-option", "/test-path"]).symbolGraphMinimumAccessLevel
+        )
+
+        XCTAssertNil(
+            Arguments(["other-arg", "--other-option", "/test-path", "--other-flag"]).symbolGraphMinimumAccessLevel
+        )
+    }
+
+    func testArgumentsThatContainTrailingAccessLevelFlag() {
+        XCTAssertNil(
+            Arguments(["--symbol-graph-minimum-access-level"]).symbolGraphMinimumAccessLevel
+        )
+
+
+        XCTAssertNil(
+            Arguments(["other-arg", "--symbol-graph-minimum-access-level"]).symbolGraphMinimumAccessLevel
+        )
+    }
+}