working on undo - does not build rn

RibbonGroup.swift

@@ -0,0 +1,59 @@
+//
+//  RibbonGroup.swift
+//  gloss
+//
+//  Created by Saint on 2/24/23.
+//
+
+import GRDB
+/// The Line struct.
+///
+/// Identifiable conformance supports SwiftUI list animations, and type-safe
+/// GRDB primary key methods.
+/// Equatable conformance supports tests.
+struct RibbonGroup: Identifiable, Equatable {
+    /// The player id.
+    ///
+    /// Int64 is the recommended type for auto-incremented database ids.
+    /// Use nil for players that are not inserted yet in the database.
+    var id: Int64?
+    var pos: Int
+    var title: String
+    var current_undo_level: Int
+    var min_level: Int
+    var max_level: Int
+
+}
+
+extension RibbonGroup {
+}
+
+// MARK: - Persistence
+
+/// Make Line a Codable Record.
+///
+/// See <https://github.com/groue/GRDB.swift/blob/master/README.md#records>
+extension RibbonGroup: Codable, FetchableRecord, MutablePersistableRecord {
+    // Define database columns from CodingKeys
+    fileprivate enum Columns {
+        static let id = Column(CodingKeys.id)
+        static let pos = Column(CodingKeys.pos)
+        static let book = Column(CodingKeys.book)
+        static let title = Column(CodingKeys.title)
+        static let scrollOffset = Column(CodingKeys.scrollOffset)
+    }
+
+    /// Updates a player id after it has been inserted in the database.
+    mutating func didInsert(_ inserted: InsertionSuccess) {
+        id = inserted.rowID
+    }
+}
+
+// MARK: - Line Database Requests
+
+/// Define some player requests used by the application.
+///
+/// See <https://github.com/groue/GRDB.swift/blob/master/README.md#requests>
+/// See <https://github.com/groue/GRDB.swift/blob/master/Documentation/GoodPracticesForDesigningRecordTypes.md>
+extension DerivableRequest<RibbonGroup> {
+}

SegmentedSelector.swift

@@ -0,0 +1,26 @@
+@State var selection = 0
+var body: some View {
+    HStack {
+        BackArrow()
+            .frame(width: CGFloat(30), height: CGFloat(30))
+            .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
+            .if(selection == 0) { $0.background(Color.white) }
+            .if(selection != 0) { $0.background(Color.black) }
+            .onTapGesture {
+                withAnimation(.spring(response: 0.5)) {
+                    self.selection = 0
+                }
+            }
+
+        ForwardArrow()
+            .frame(width: CGFloat(30), height: CGFloat(30))
+            .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
+            .if(selection == 1) { $0.background(Color.white) }
+            .if(selection != 1) { $0.background(Color.black) }
+            .onTapGesture {
+                withAnimation(.spring(response: 0.5)) {
+                    self.selection = 1
+                }
+            }
+    }
+}

SelectedRibbon.swift

@@ -17,7 +17,7 @@ struct SelectedRibbon: Identifiable, Equatable {
     /// Int64 is the recommended type for auto-incremented database ids.
     /// Use nil for players that are not inserted yet in the database.
     var id: Int64?
-    var ribbonId: Int64
+    var ribbonGroupId: Int64
 }
 
 extension SelectedRibbon {
@@ -34,7 +34,7 @@ extension SelectedRibbon: Codable, FetchableRecord, MutablePersistableRecord {
         static let id = Column(CodingKeys.id)
         static let ribbonId = Column(CodingKeys.ribbonId)
     }
-    
+
     /// Updates a player id after it has been inserted in the database.
     mutating func didInsert(_ inserted: InsertionSuccess) {
         id = inserted.rowID

gloss.xcodeproj/project.pbxproj

@@ -9,6 +9,7 @@
 /* Begin PBXBuildFile section */
 		851259B02C05281300BE70F8 /* BackButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 851259AF2C05281300BE70F8 /* BackButton.swift */; };
 		851259B22C05299200BE70F8 /* ForwardArrow.swift in Sources */ = {isa = PBXBuildFile; fileRef = 851259B12C05299200BE70F8 /* ForwardArrow.swift */; };
+		851259B42C05788800BE70F8 /* RibbonGroup.swift in Sources */ = {isa = PBXBuildFile; fileRef = 851259B32C05788800BE70F8 /* RibbonGroup.swift */; };
 		8514D5BC299EFB780054F185 /* store.db in Resources */ = {isa = PBXBuildFile; fileRef = 8514D5BB299EFB780054F185 /* store.db */; };
 		8514D5BF299F04710054F185 /* GRDB in Frameworks */ = {isa = PBXBuildFile; productRef = 8514D5BE299F04710054F185 /* GRDB */; };
 		852774C129A150B100458CA7 /* Line.swift in Sources */ = {isa = PBXBuildFile; fileRef = 852774C029A150B100458CA7 /* Line.swift */; };
@@ -49,6 +50,7 @@
 /* Begin PBXFileReference section */
 		851259AF2C05281300BE70F8 /* BackButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackButton.swift; sourceTree = "<group>"; };
 		851259B12C05299200BE70F8 /* ForwardArrow.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ForwardArrow.swift; sourceTree = "<group>"; };
+		851259B32C05788800BE70F8 /* RibbonGroup.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RibbonGroup.swift; sourceTree = "<group>"; };
 		8514D5BB299EFB780054F185 /* store.db */ = {isa = PBXFileReference; lastKnownFileType = file; path = store.db; sourceTree = "<group>"; };
 		852774C029A150B100458CA7 /* Line.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Line.swift; sourceTree = "<group>"; };
 		8528897429B2B86B003F2E16 /* CrownOfThorns.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CrownOfThorns.swift; sourceTree = "<group>"; };
@@ -129,6 +131,7 @@
 				8528897B29BD69B2003F2E16 /* VisibilityTracker.swift */,
 				8528897A29BD69B1003F2E16 /* VisibilityTrackingModifier.swift */,
 				8528897929BD69B1003F2E16 /* VisibilityTrackingScrollView.swift */,
+				851259B32C05788800BE70F8 /* RibbonGroup.swift */,
 				8590D96A29A8374B001EF84F /* json */,
 				8514D5BA299EF2EC0054F185 /* db */,
 				85F01DF9297878B400F317B4 /* fonts */,
@@ -301,6 +304,7 @@
 				8590D96729A183EE001EF84F /* AppDatabase.swift in Sources */,
 				8590D96929A18A6D001EF84F /* LineRequest.swift in Sources */,
 				852774C129A150B100458CA7 /* Line.swift in Sources */,
+				851259B42C05788800BE70F8 /* RibbonGroup.swift in Sources */,
 				85942EEF29AEA18300307621 /* SelectedRibbonRequest.swift in Sources */,
 				8590D96C29A92146001EF84F /* JsonImport.swift in Sources */,
 				85942EED29AEA04200307621 /* SelectedRibbon.swift in Sources */,

gloss/AppDatabase.swift

@@ -51,10 +51,19 @@ struct AppDatabase {
                 t.column("book", .text).notNull()
             }
 
-            try db.create(table: "Ribbon") { t in
+            try db.create(table: "RibbonGroup") { t in
                 t.autoIncrementedPrimaryKey("id")
+                t.column("currentUndoLevel", .integer).notNull()
+                t.column("minLevel", .integer).notNull()
+                t.column("maxLevel", .text).notNull()
                 t.column("pos", .integer).notNull()
                 t.column("title", .text).notNull()
+            }
+
+            try db.create(table: "Ribbon") { t in
+                t.autoIncrementedPrimaryKey("id")
+                t.column("group", .integer).notNull()
+                t.column("undoLevel", .integer).notNull()
                 t.column("book", .text).notNull()
                 t.column("scrollOffset", .integer).notNull()
                 t.column("scrollId", .text)
@@ -62,7 +71,7 @@ struct AppDatabase {
 
             try db.create(table: "SelectedRibbon") { t in
                 t.autoIncrementedPrimaryKey("id")
-                t.column("ribbonId", .integer).notNull()
+                t.column("ribbonGroupId", .integer).notNull()
             }
 
             try db.create(table: "ScrollState") { t in
@@ -246,10 +255,50 @@ extension AppDatabase {
             if try Line.all().isEmpty(db) {
                 try importJson("john_export.json", db)
                 try importJson("mark_export.json", db)
-                _ = try Ribbon(id: 1, pos: 1, title: "John", book: "bible.john", scrollId: "1", scrollOffset: 0).inserted(db)
+
-                _ = try Ribbon(id: 2, pos: 2, title: "Gospel of Mark", book: "bible.mark", scrollId: "1", scrollOffset: 300).inserted(db)
+                    _ = try RibbonGroup(id: 1,
-                _ = try Ribbon(id: 3, pos: 3, title: "John 2", book: "bible.john", scrollId: "1", scrollOffset: 0).inserted(db)
+                                   pos: 1,
-                _ = try SelectedRibbon(id: 1, ribbonId: 1).inserted(db)
+                                   title: "John",
+                                   current_undo_level: 1,
+                                   min_level: 1,
+                                   max_level: 1).inserted(db)
+
+                    _ = try Ribbon(id: 1,
+                                   group: 1,
+                                   undoLevel: 1,
+                                   book: "bible.john",
+                                   scrollId: "1",
+                                   scrollOffset: 0).inserted(db)
+
+                    _ = try RibbonGroup(id: 2,
+                                   pos: 2,
+                                   title: "Second",
+                                   current_undo_level: 1,
+                                   min_level: 1,
+                                   max_level: 1).inserted(db)
+
+                    _ = try Ribbon(id: 2,
+                                   group: 2,
+                                   undoLevel: 1,
+                                   book: "bible.mark",
+                                   scrollId: "1",
+                                   scrollOffset: 0).inserted(db)
+
+                    _ = try RibbonGroup(id: 3,
+                                   pos: 3,
+                                   title: "Another one",
+                                   current_undo_level: 1,
+                                   min_level: 1,
+                                   max_level: 1).inserted(db)
+
+                    _ = try Ribbon(id: 3,
+                                   group: 3,
+                                   undoLevel: 1,
+                                   book: "bible.john",
+                                   scrollId: "1",
+                                   scrollOffset: 0).inserted(db)
+
+                _ = try SelectedRibbon(id: 1, ribbonGroupId: 1).inserted(db)
             }
         }
         } catch {

gloss/ContentView.swift

@@ -272,46 +272,14 @@ struct ContentView: View {
                     HStack {
                         BackArrow()
                             .frame(width: CGFloat(30), height: CGFloat(30))
-                            .scaledToFit()
+                            .background(Color(red: 0.1, green: 0.1, blue: 0.1))
                             .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
-                            .tag(0)
 
                         ForwardArrow()
                             .frame(width: CGFloat(30), height: CGFloat(30))
+                            .background(Color(red: 0.1, green: 0.1, blue: 0.1))
                             .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
-                            .tag(1)
-
-                        Text("cat")
-                            .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
-                            .tag(2)
                     }
-                    .cornerRadius(15)
-
-                    HStack {
-                        BackArrow()
-                            .frame(width: CGFloat(30), height: CGFloat(30))
-                            .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
-                            .if(selection == 0) { $0.background(Color.white) }
-                            .if(selection != 0) { $0.background(Color.black) }
-                            .onTapGesture {
-                                withAnimation(.spring(response: 0.2)) {
-                                    self.selection = 0
-                                }
-                            }
-
-                        ForwardArrow()
-                            .frame(width: CGFloat(30), height: CGFloat(30))
-                            .foregroundColor(Color(UIColor(red: 0.30, green: 0.30, blue: 0.30, alpha: 0.4)))
-                            .if(selection == 1) { $0.background(Color.white) }
-                            .if(selection != 1) { $0.background(Color.black) }
-                            .onTapGesture {
-                                withAnimation(.spring(response: 0.2)) {
-                                    self.selection = 1
-                                }
-                            }
-                    }
-
-                    .background(Color.black)
                     .cornerRadius(5)
                 }
                 .offset(x: geometry.size.width - 300)

gloss/Ribbon.swift

@@ -17,8 +17,8 @@ struct Ribbon: Identifiable, Equatable {
     /// Int64 is the recommended type for auto-incremented database ids.
     /// Use nil for players that are not inserted yet in the database.
     var id: Int64?
-    var pos: Int
+    var group: Int
-    var title: String
+    var undoLevel: Int
     var book: String
     var scrollId: String
     var scrollOffset: Int
@@ -41,7 +41,7 @@ extension Ribbon: Codable, FetchableRecord, MutablePersistableRecord {
         static let title = Column(CodingKeys.title)
         static let scrollOffset = Column(CodingKeys.scrollOffset)
     }
-    
+
     /// Updates a player id after it has been inserted in the database.
     mutating func didInsert(_ inserted: InsertionSuccess) {
         id = inserted.rowID