2 files changed, 141 insertions, 0 deletions
diff --git a/Hutch/Extensions/SRHTShareUI.swift b/Hutch/Extensions/SRHTShareUI.swift
new file mode 100644
index 0000000..9d949c9
--- /dev/null
+++ b/Hutch/Extensions/SRHTShareUI.swift
@@ -0,0 +1,57 @@
+import SwiftUI
+import UIKit
+
+enum SRHTShareTarget: String {
+    case repository = "repository"
+    case commit = "commit"
+    case file = "file"
+    case build = "build"
+    case tracker = "tracker"
+    case ticket = "ticket"
+    case profile = "profile"
+
+    var fallbackMessage: String {
+        "This \(rawValue) does not have a valid web URL to share."
+    }
+}
+
+struct SRHTShareButton<Label: View>: View {
+    let url: URL?
+    let target: SRHTShareTarget
+    @ViewBuilder let label: () -> Label
+
+    @State private var isShowingShareSheet = false
+    @State private var isShowingFallbackAlert = false
+
+    var body: some View {
+        Button {
+            if url != nil {
+                isShowingShareSheet = true
+            } else {
+                isShowingFallbackAlert = true
+            }
+        } label: {
+            label()
+        }
+        .sheet(isPresented: $isShowingShareSheet) {
+            if let url {
+                ShareSheet(activityItems: [url])
+            }
+        }
+        .alert("Share Unavailable", isPresented: $isShowingFallbackAlert) {
+            Button("OK", role: .cancel) {}
+        } message: {
+            Text(target.fallbackMessage)
+        }
+    }
+}
+
+private struct ShareSheet: UIViewControllerRepresentable {
+    let activityItems: [Any]
+
+    func makeUIViewController(context: Context) -> UIActivityViewController {
+        UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
+    }
+
+    func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {}
+}
diff --git a/Hutch/Extensions/SRHTWebURL.swift b/Hutch/Extensions/SRHTWebURL.swift
new file mode 100644
index 0000000..53556de
--- /dev/null
+++ b/Hutch/Extensions/SRHTWebURL.swift
@@ -0,0 +1,84 @@
+import Foundation
+
+enum SRHTWebURL {
+    static func repository(_ repository: RepositorySummary) -> URL? {
+        userScopedURL(
+            host: "\(repository.service.rawValue).sr.ht",
+            ownerCanonicalName: repository.owner.canonicalName,
+            pathComponents: [repository.name]
+        )
+    }
+
+    static func build(jobId: Int, ownerCanonicalName: String) -> URL? {
+        userScopedURL(
+            host: "builds.sr.ht",
+            ownerCanonicalName: ownerCanonicalName,
+            pathComponents: ["job", String(jobId)]
+        )
+    }
+
+    static func tracker(ownerUsername: String, trackerName: String) -> URL? {
+        userScopedURL(
+            host: "todo.sr.ht",
+            ownerUsername: ownerUsername,
+            pathComponents: [trackerName]
+        )
+    }
+
+    static func ticket(ownerUsername: String, trackerName: String, ticketId: Int) -> URL? {
+        userScopedURL(
+            host: "todo.sr.ht",
+            ownerUsername: ownerUsername,
+            pathComponents: [trackerName, String(ticketId)]
+        )
+    }
+
+    static func profile(canonicalName: String) -> URL? {
+        userScopedURL(
+            host: "meta.sr.ht",
+            ownerCanonicalName: canonicalName,
+            pathComponents: []
+        )
+    }
+
+    private static func userScopedURL(
+        host: String,
+        ownerCanonicalName: String,
+        pathComponents: [String]
+    ) -> URL? {
+        userScopedURL(
+            host: host,
+            ownerUsername: username(from: ownerCanonicalName),
+            pathComponents: pathComponents
+        )
+    }
+
+    private static func userScopedURL(
+        host: String,
+        ownerUsername: String,
+        pathComponents: [String]
+    ) -> URL? {
+        var components = URLComponents()
+        components.scheme = "https"
+        components.host = host
+
+        let encodedComponents = (["~\(ownerUsername)"] + pathComponents).map { pathComponent in
+            pathComponent.addingPercentEncoding(withAllowedCharacters: pathComponentCharacterSet) ?? pathComponent
+        }
+        components.percentEncodedPath = "/" + encodedComponents.joined(separator: "/")
+        return components.url
+    }
+
+    private static func username(from canonicalName: String) -> String {
+        if canonicalName.hasPrefix("~") {
+            return String(canonicalName.dropFirst())
+        }
+        return canonicalName
+    }
+
+    private static let pathComponentCharacterSet: CharacterSet = {
+        var characterSet = CharacterSet.urlPathAllowed
+        characterSet.remove(charactersIn: "/")
+        return characterSet
+    }()
+}