Update Ghostgram features

Swiftgram/SGAppGroupIdentifier/BUILD

@@ -0,0 +1,17 @@
+load("@build_bazel_rules_swift//swift:swift.bzl", "swift_library")
+
+swift_library(
+    name = "SGAppGroupIdentifier",
+    module_name = "SGAppGroupIdentifier",
+    srcs = glob([
+        "Sources/**/*.swift",
+    ]),
+    copts = [
+        "-warnings-as-errors",
+    ],
+    deps = [
+    ],
+    visibility = [
+        "//visibility:public",
+    ],
+)

Swiftgram/SGAppGroupIdentifier/Sources/SGAppGroupIdentifier.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+public let FALLBACK_BASE_BUNDLE_ID: String = "app.swiftgram.ios"
+
+public func sgBaseBundleIdentifier() -> String {
+    let baseBundleId: String
+    if let bundleId: String = Bundle.main.bundleIdentifier {
+        if Bundle.main.bundlePath.hasSuffix(".appex") {
+            if let lastDotRange: Range<String.Index> = bundleId.range(of: ".", options: [.backwards]) {
+                baseBundleId = String(bundleId[..<lastDotRange.lowerBound])
+            } else {
+                baseBundleId = FALLBACK_BASE_BUNDLE_ID
+            }
+        } else {
+            baseBundleId = bundleId
+        }
+    } else {
+        baseBundleId = FALLBACK_BASE_BUNDLE_ID
+    }
+    return baseBundleId
+}
+
+public func sgAppGroupIdentifier() -> String {
+    let result: String = "group.\(sgBaseBundleIdentifier())"
+    
+    #if DEBUG
+    print("APP_GROUP_IDENTIFIER: \(result)")
+    #endif
+    
+    return result
+}