Modify font descriptor traits when applying bold/italic formatting

instead of replacing font entirely.

Fixes #51

Pachyderm/Model/Instance.swift

@@ -12,19 +12,49 @@ public class Instance: Decodable {
     public let uri: String
     public let title: String
     public let description: String
-    public let email: String
+    public let email: String?
     public let version: String
     public let urls: [String: URL]
-    
-    // pleroma doesn't currently implement these
+    public let thumbnail: URL?
     public let languages: [String]?
+    public let stats: Stats?
+
+    // pleroma doesn't currently implement these
     public let contactAccount: Account?
     
     // MARK: Unofficial additions to the Mastodon API.
-    public let stats: Stats?
-    public let thumbnail: URL?
     public let maxStatusCharacters: Int?
     
+    // we need a custom decoder, because all API-compatible implementations don't return some data in the same format
+    public required init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        self.uri = try container.decode(String.self, forKey: .uri)
+        self.title = try container.decode(String.self, forKey: .title)
+        self.description = try container.decode(String.self, forKey: .description)
+        self.email = try container.decodeIfPresent(String.self, forKey: .email)
+        self.version = try container.decode(String.self, forKey: .version)
+        if let urls = try? container.decodeIfPresent([String: URL].self, forKey: .urls) {
+            self.urls = urls
+        } else {
+            self.urls = [:]
+        }
+        
+        self.languages = try? container.decodeIfPresent([String].self, forKey: .languages)
+        self.contactAccount = try? container.decodeIfPresent(Account.self, forKey: .contactAccount)
+        
+        self.stats = try? container.decodeIfPresent(Stats.self, forKey: .stats)
+        self.thumbnail = try? container.decodeIfPresent(URL.self, forKey: .thumbnail)
+        if let maxStatusCharacters = try? container.decodeIfPresent(Int.self, forKey: .maxStatusCharacters) {
+            self.maxStatusCharacters = maxStatusCharacters
+        } else if let str = try? container.decodeIfPresent(String.self, forKey: .maxStatusCharacters),
+            let maxStatusCharacters = Int(str, radix: 10) {
+            self.maxStatusCharacters = maxStatusCharacters
+        } else {
+            self.maxStatusCharacters = nil
+        }
+        
+    }
+    
     private enum CodingKeys: String, CodingKey {
         case uri
         case title
@@ -32,11 +62,12 @@ public class Instance: Decodable {
         case email
         case version
         case urls
+        case thumbnail
         case languages
+        case stats
+        
         case contactAccount = "contact_account"
         
-        case stats
-        case thumbnail
         case maxStatusCharacters = "max_toot_chars"
     }
 }

Tusker.xcodeproj/project.pbxproj

@@ -118,6 +118,7 @@
 		D667E5F12134D5050057A976 /* UIViewController+Delegates.swift in Sources */ = {isa = PBXBuildFile; fileRef = D667E5F02134D5050057A976 /* UIViewController+Delegates.swift */; };
 		D667E5F52135BCD50057A976 /* ConversationTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D667E5F42135BCD50057A976 /* ConversationTableViewController.swift */; };
 		D667E5F82135C3040057A976 /* Mastodon+Equatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = D667E5F72135C3040057A976 /* Mastodon+Equatable.swift */; };
+		D66A77BB233838DC0058F1EC /* UIFont+Traits.swift in Sources */ = {isa = PBXBuildFile; fileRef = D66A77BA233838DC0058F1EC /* UIFont+Traits.swift */; };
 		D6757A7C2157E01900721E32 /* XCBManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6757A7B2157E01900721E32 /* XCBManager.swift */; };
 		D6757A7E2157E02600721E32 /* XCBRequestSpec.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6757A7D2157E02600721E32 /* XCBRequestSpec.swift */; };
 		D6757A822157E8FA00721E32 /* XCBSession.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6757A812157E8FA00721E32 /* XCBSession.swift */; };
@@ -376,6 +377,7 @@
 		D667E5F02134D5050057A976 /* UIViewController+Delegates.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIViewController+Delegates.swift"; sourceTree = "<group>"; };
 		D667E5F42135BCD50057A976 /* ConversationTableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationTableViewController.swift; sourceTree = "<group>"; };
 		D667E5F72135C3040057A976 /* Mastodon+Equatable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Mastodon+Equatable.swift"; sourceTree = "<group>"; };
+		D66A77BA233838DC0058F1EC /* UIFont+Traits.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIFont+Traits.swift"; sourceTree = "<group>"; };
 		D6757A7B2157E01900721E32 /* XCBManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = XCBManager.swift; sourceTree = "<group>"; };
 		D6757A7D2157E02600721E32 /* XCBRequestSpec.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = XCBRequestSpec.swift; sourceTree = "<group>"; };
 		D6757A812157E8FA00721E32 /* XCBSession.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = XCBSession.swift; sourceTree = "<group>"; };
@@ -893,6 +895,7 @@
 				D6333B782139AEFD00CE884A /* Date+TimeAgo.swift */,
 				D67C57AE21E28EAD00C3118B /* Array+Uniques.swift */,
 				0450531E22B0097E00100BA2 /* Timline+UI.swift */,
+				D66A77BA233838DC0058F1EC /* UIFont+Traits.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -1559,6 +1562,7 @@
 				D6D58DF922074B74009C8DD9 /* LinkLabel.swift in Sources */,
 				0454DDAF22B462EF00B8BB8E /* GalleryExpandAnimationController.swift in Sources */,
 				D6A3BC8A2321F79B00FD64D5 /* AccountTableViewCell.swift in Sources */,
+				D66A77BB233838DC0058F1EC /* UIFont+Traits.swift in Sources */,
 				D68FEC4F232C5BC300C84F23 /* SegmentedPageViewController.swift in Sources */,
 				0450531F22B0097E00100BA2 /* Timline+UI.swift in Sources */,
 				D667E5F52135BCD50057A976 /* ConversationTableViewController.swift in Sources */,

Tusker/Extensions/UIFont+Traits.swift

@@ -0,0 +1,21 @@
+//
+//  UIFont+Traits.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 9/22/19.
+//  Copyright © 2019 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+extension UIFont {
+    
+    func addingTraits(_ traits: UIFontDescriptor.SymbolicTraits, size: CGFloat? = nil) -> UIFont? {
+        let descriptor = self.fontDescriptor
+        guard let newDescriptor = descriptor.withSymbolicTraits([descriptor.symbolicTraits, traits]) else {
+            return nil
+        }
+        return UIFont(descriptor: newDescriptor, size: size ?? self.pointSize)
+    }
+    
+}

Tusker/Views/Compose Media/ComposeMediaView.xib

@@ -1,11 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14810.11" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14868" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
     <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14766.13"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14824"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
-        <capability name="iOS 13.0 system colors" minToolsVersion="11.0"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
@@ -14,7 +13,7 @@
             <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
             <subviews>
-                <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="u7I-sx-kUe">
+                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="u7I-sx-kUe">
                     <rect key="frame" x="8" y="293.5" width="80" height="80"/>
                     <constraints>
                         <constraint firstAttribute="height" constant="80" id="CgF-eC-We6"/>
@@ -34,7 +33,7 @@
                 </button>
                 <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" scrollEnabled="NO" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="O6b-Zs-u8r">
                     <rect key="frame" x="96" y="0.0" width="241" height="667"/>
-                    <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                    <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
                     <constraints>
                         <constraint firstAttribute="height" relation="greaterThanOrEqual" constant="80" id="GsE-uM-fhe"/>
                     </constraints>
@@ -49,13 +48,13 @@
                 </label>
                 <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="0h4-wv-2R8">
                     <rect key="frame" x="0.0" y="0.0" width="375" height="1"/>
-                    <color key="backgroundColor" cocoaTouchSystemColor="separatorColor"/>
+                    <color key="backgroundColor" systemColor="separatorColor" red="0.23529411764705882" green="0.23529411764705882" blue="0.2627450980392157" alpha="0.28999999999999998" colorSpace="custom" customColorSpace="sRGB"/>
                     <constraints>
                         <constraint firstAttribute="height" constant="1" id="aQa-2T-uYY"/>
                     </constraints>
                 </view>
             </subviews>
-            <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+            <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
             <constraints>
                 <constraint firstItem="vUN-kp-3ea" firstAttribute="bottom" secondItem="O6b-Zs-u8r" secondAttribute="bottom" id="3sv-wo-gxe"/>
                 <constraint firstItem="u7I-sx-kUe" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="centerY" id="5Qs-i7-glv"/>

Tusker/Views/ContentLabel.swift

@@ -128,9 +128,11 @@ class ContentLabel: LinkLabel {
             case "p":
                 attributed.append(NSAttributedString(string: "\n\n"))
             case "em", "i":
-                attributed.addAttribute(.font, value: UIFont.italicSystemFont(ofSize: font!.pointSize), range: attributed.fullRange)
+                let currentFont: UIFont = attributed.attribute(.font, at: 0, effectiveRange: nil) as? UIFont ?? self.font
+                attributed.addAttribute(.font, value: currentFont.addingTraits(.traitItalic), range: attributed.fullRange)
             case "strong", "b":
-                attributed.addAttribute(.font, value: UIFont.boldSystemFont(ofSize: font!.pointSize), range: attributed.fullRange)
+                let currentFont: UIFont = attributed.attribute(.font, at: 0, effectiveRange: nil) as? UIFont ?? self.font
+                attributed.addAttribute(.font, value: currentFont.addingTraits(.traitBold), range: attributed.fullRange)
             case "del":
                 attributed.addAttribute(.strikethroughStyle, value: NSUnderlineStyle.single.rawValue, range: attributed.fullRange)
             case "code":