Brendan Szymanski
1330f2bd25
Extracted from gtk-swift monorepo. Previous history contains 38 commits across the full Phase 1 development including GIR XML parsing, IR model, analysis engine, code generation, CLI, plugins, and documentation.
75 lines
2.9 KiB
Swift
75 lines
2.9 KiB
Swift
import PackagePlugin
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import Foundation
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/// SwiftPM build tool plugin that automatically generates Swift GIR bindings.
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///
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/// Inspects each target for a `Config.swift` file and `.gir` files, then
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/// invokes the `swift-gtk-gen` executable to produce Swift source before compilation.
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/// Targets without a config or GIR files are silently skipped.
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@main
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struct SwiftGtkGenBuildPlugin: BuildToolPlugin {
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/// Creates build commands for GIR code generation for the given target.
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///
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/// Returns a single `.buildCommand` that runs `swift-gtk-gen` with the target's
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/// config and GIR files as inputs. If the target has no `Config.swift` or
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/// no `.gir` files, returns an empty array.
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///
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/// - Parameters:
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/// - context: The plugin context providing access to tools and work directories.
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/// - target: The target to generate bindings for.
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/// - Returns: An array of build commands (empty if no GIR files present).
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func createBuildCommands(context: PluginContext, target: Target) async throws -> [Command] {
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let targetDir = target.directoryURL
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let configURL = targetDir.appending(path: "Config.swift")
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guard FileManager.default.fileExists(atPath: configURL.path()) else {
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return []
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}
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let executable = try context.tool(named: "swift-gtk-gen")
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let girFiles = findGIRFiles(in: targetDir)
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guard !girFiles.isEmpty else { return [] }
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let outputDir = context.pluginWorkDirectoryURL
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return [
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.buildCommand(
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displayName: "Generating \(target.name) GIR bindings...",
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executable: executable.url,
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arguments: [
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"--config", configURL.path(),
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"--library", target.name,
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"--version", "4.0",
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"--output", outputDir.appending(path: target.name).path(),
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],
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inputFiles: [configURL] + girFiles,
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outputFiles: [
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outputDir.appending(path: "\(target.name)/Generated.swift")
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]
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)
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]
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}
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/// Recursively finds all `.gir` files in the given directory.
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///
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/// Uses a directory enumerator to walk the file tree and collect URLs
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/// whose path extension is `"gir"`.
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///
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/// - Parameter directory: The root directory to search.
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/// - Returns: An array of URLs pointing to discovered `.gir` files.
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private func findGIRFiles(in directory: URL) -> [URL] {
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guard let enumerator = FileManager.default.enumerator(
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at: directory, includingPropertiesForKeys: [.isRegularFileKey]
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) else {
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return []
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}
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var girFiles: [URL] = []
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for case let fileURL as URL in enumerator {
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if fileURL.pathExtension == "gir" {
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girFiles.append(fileURL)
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}
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}
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return girFiles
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}
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}
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