Make VimR tab colors match 1:1 with colorscheme.

Additionally: Pick up system accent color properly when no colors set.

NvimView+Resize.swift:
  - Now transmitting Tabline, TablineFill  colors to the VimR
    UI, as well as TablineSel
  - Replace the built-in get() + nvim_get_hl() method because they don't
   have handle 'link' highlights properly (they return -1 for color code)
  - defined a new GetHiColor vimscript method that behaves like get()
       but also reads `link` type highlight groups by following the
       link.

NvimView+Types.swift:
  - visualForegroundColor is picked up from user accent color in System
    Settings using NSColor.Name("controlAccentColor")
  - Updated to include all additional colors

NvimView+UiBridge.swift:
 - Updated MessagePackUtils value code to accomodate new color code fields

Tabs/Tab.swift:
 - Get Selected tab color from TablineSel

Tabs/TabBar.swift:
 - Set tab bar color to TablineFill

Tabs/Theme.swift:
- Add new fields for TablineFill and TablineSel color corresponding to
  tab bar background and selected tab colors
- Minor rearranging of field order

VimR/Theme.swift:
- Add new fields for the tab bar, tab, and selected tab colors

NvimView/Sources/NvimView/NvimView+Resize.swift

@@ -109,16 +109,26 @@ extension NvimView {
               throw RxNeovimApi.Error.exception(message: "Incompatible neovim version.")
             }
 
-            // swiftformat:disable all
-            return self.api.nvimExec2(src: """
-            let g:gui_vimr = 1
-            autocmd VimLeave * call rpcnotify(\(channel), 'autocommand', 'vimleave')
-            autocmd VimEnter * call rpcnotify(\(channel), 'autocommand', 'vimenter')
-            autocmd ColorScheme * call rpcnotify(\(channel), 'autocommand', 'colorscheme', get(nvim_get_hl(0, {'id': hlID('Normal')}), 'fg', -1), get(nvim_get_hl(0, {'id': hlID('Normal')}), 'bg', -1), get(nvim_get_hl(0, {'id': hlID('Visual')}), 'fg', -1), get(nvim_get_hl(0, {'id': hlID('Visual')}), 'bg', -1), get(nvim_get_hl(0, {'id': hlID('Directory')}), 'fg', -1), get(nvim_get_hl(0, {'id': hlID('TablineSel')}), 'bg', -1), get(nvim_get_hl(0, {'id': hlID('TablineSel')}), 'fg', -1))
-            autocmd VimEnter * call rpcrequest(\(channel), 'vimenter')
-            """, opts: [:], errWhenBlocked: false)
-            // swiftformat:enable all
-              .asCompletable()
+          // swiftformat:disable all
+          let vimscript = """
+          function! GetHiColor(hlID, component)
+            let color = synIDattr(synIDtrans(hlID(a:hlID)), a:component)
+            if empty(color)
+              return -1
+            else
+              return str2nr(color[1:], 16)
+            endif
+          endfunction
+          let g:gui_vimr = 1
+          autocmd VimLeave * call rpcnotify(\(channel), 'autocommand', 'vimleave')
+          autocmd VimEnter * call rpcnotify(\(channel), 'autocommand', 'vimenter')
+          autocmd ColorScheme * call rpcnotify(\(channel), 'autocommand', 'colorscheme', GetHiColor('Normal', 'fg'), GetHiColor('Normal', 'bg'), GetHiColor('Visual', 'fg'), GetHiColor('Visual', 'bg'), GetHiColor('Directory', 'fg'), GetHiColor('TablineFill', 'bg'), GetHiColor('TablineFill', 'fg'), GetHiColor('Tabline', 'bg'), GetHiColor('Tabline', 'fg'), GetHiColor('TablineSel', 'bg'), GetHiColor('TablineSel', 'fg'))
+          autocmd VimEnter * call rpcrequest(\(channel), 'vimenter')
+          """
+
+          return self.api.nvimExec2(src: vimscript, opts: [:], errWhenBlocked: false)
+            .asCompletable()
+          // swiftformat:enable all
           }
       )
       .andThen(

NvimView/Sources/NvimView/NvimView+Types.swift

@@ -94,21 +94,28 @@ public extension NvimView {
     public var foreground = NSColor.textColor
     public var background = NSColor.textBackgroundColor
 
-    public var visualForeground = NSColor.selectedMenuItemTextColor
+    public var visualForeground: NSColor = NSColor(named: NSColor.Name("controlAccentColor")) ?? .selectedMenuItemTextColor
+    // NSColor.selectedMenuItemTextColor
     // NSColor.selectedMenuItemColor is deprecated. The doc says that
     // NSVisualEffectView.Material.selection should be used instead, but I don't know how to get
     // an NSColor from it.
     public var visualBackground = NSColor.selectedContentBackgroundColor
 
     public var directoryForeground = NSColor.textColor
 
-    public var tabForeground = NSColor.textColor
-    public var tabBackground = NSColor.textBackgroundColor
+    public var tabForeground = NSColor.controlColor
+    public var tabBackground = NSColor.controlBackgroundColor
+
+    public var tabBarForeground = NSColor.textColor
+    public var tabBarBackground = NSColor.windowBackgroundColor
+
+    public var selectedTabForeground = NSColor.selectedTextColor
+    public var selectedTabBackground = NSColor.selectedTextBackgroundColor
 
     public init() {}
 
     public init(_ values: [Int]) {
-      if values.count < 7 { preconditionFailure("We need 7 colors!") }
+      if values.count < 11 { preconditionFailure("We need 11 colors!") }
 
       let color = ColorUtils.colorIgnoringAlpha
 
@@ -121,15 +128,25 @@ public extension NvimView {
       self.directoryForeground = values[4] < 0
         ? Theme.default.directoryForeground
         : color(values[4])
-      self.tabBackground = values[5] < 0 ? Theme.default.background : color(values[5])
-      self.tabForeground = values[6] < 0 ? Theme.default.foreground : color(values[6])
+
+      self.tabBarBackground = values[5] < 0 ? Theme.default.tabBarBackground : color(values[5])
+      self.tabBarForeground = values[6] < 0 ? Theme.default.tabBarForeground : color(values[6])
+
+      self.tabBackground = values[7] < 0 ? Theme.default.tabBackground : color(values[7])
+      self.tabForeground = values[8] < 0 ? Theme.default.tabForeground : color(values[8])
+
+      self.selectedTabBackground = values[9] < 0 ? Theme.default.selectedTabBackground : color(values[9])
+      self.selectedTabForeground = values[10] < 0 ? Theme.default.selectedTabForeground : color(values[10])
+
     }
 
     public var description: String {
       "NVV.Theme<" +
         "fg: \(self.foreground.hex), bg: \(self.background.hex), " +
         "visual-fg: \(self.visualForeground.hex), visual-bg: \(self.visualBackground.hex)" +
         "tab-fg: \(self.tabForeground.hex), tab-bg: \(self.tabBackground.hex)" +
+        "tabfill-fg: \(self.tabBarForeground.hex), tabfill-bg: \(self.tabBarBackground.hex)" +
+        "tabsel-fg: \(self.selectedTabForeground.hex), tabsel-bg: \(self.selectedTabBackground.hex)" +
         ">"
     }
   }

NvimView/Sources/NvimView/NvimView+UiBridge.swift

@@ -513,7 +513,7 @@ extension NvimView {
 
   private func colorSchemeChanged(_ value: MessagePackValue) {
     guard let values = MessagePackUtils.array(
-      from: value, ofSize: 7, conversion: { $0.intValue }
+      from: value, ofSize: 11, conversion: { $0.intValue }
     ) else {
       self.bridgeLogger.error("Could not convert \(value)")
       return

Tabs/Sources/Tabs/Tab.swift

@@ -107,8 +107,8 @@ extension Tab {
 
   private func adjustColors(_ newIsSelected: Bool) {
     if newIsSelected {
-      self.layer?.backgroundColor = self.theme.tabBackgroundColor.cgColor
-      self.titleView.textColor = self.theme.tabForegroundColor
+      self.layer?.backgroundColor = self.theme.selectedBackgroundColor.cgColor
+      self.titleView.textColor = self.theme.selectedForegroundColor
       self.closeButton.image = self.theme.selectedCloseButtonImage
     } else {
       self.layer?.backgroundColor = self.theme.backgroundColor.cgColor

Tabs/Sources/Tabs/TabBar.swift

@@ -31,14 +31,14 @@ public final class TabBar<Rep: TabRepresentative>: NSView {
     super.init(frame: .zero)
     self.configureForAutoLayout()
     self.wantsLayer = true
-    self.layer?.backgroundColor = theme.backgroundColor.cgColor
+    self.layer?.backgroundColor =  theme.tabBarBackgroundColor.cgColor
 
     self.addViews()
   }
 
   public func update(theme: Theme) {
     self._theme = theme
-    self.layer?.backgroundColor = theme.backgroundColor.cgColor
+    self.layer?.backgroundColor = theme.tabBarBackgroundColor.cgColor
 
     self.needsDisplay = true
     self.tabs.forEach { $0.updateTheme() }

Tabs/Sources/Tabs/Theme.swift

@@ -9,6 +9,8 @@ import MaterialIcons
 public struct Theme {
   public static let `default` = Self()
 
+  public var separatorColor = NSColor.gridColor
+  public var backgroundColor = NSColor.textBackgroundColor
   public var foregroundColor = NSColor.textColor {
     didSet {
       self.closeButtonImage = Icon.close.asImage(
@@ -17,25 +19,21 @@ public struct Theme {
       )
     }
   }
-
-  public var backgroundColor = NSColor.textBackgroundColor
-  public var separatorColor = NSColor.gridColor
-
+
+  public var selectedBackgroundColor = NSColor.selectedTextBackgroundColor
   public var selectedForegroundColor = NSColor.selectedTextColor {
     didSet {
       self.selectedCloseButtonImage = Icon.close.asImage(
         dimension: self.iconDimension.width,
-        color: self.tabForegroundColor
+        color: self.selectedForegroundColor
       )
     }
   }
-
-  public var selectedBackgroundColor = NSColor.selectedTextBackgroundColor
   public var tabSelectedIndicatorColor = NSColor.selectedTextColor
 
-  public var tabBackgroundColor = NSColor.selectedTextBackgroundColor
-  public var tabForegroundColor = NSColor.selectedTextColor
-
+  public var tabBarBackgroundColor = NSColor.windowBackgroundColor
+  public var tabBarForegroundColor = NSColor.textColor
+	
   public var titleFont = NSFont.systemFont(ofSize: 11)
   public var selectedTitleFont = NSFont.boldSystemFont(ofSize: 11)
 
@@ -60,12 +58,11 @@ public struct Theme {
   public init() {
     self.closeButtonImage = Icon.close.asImage(
       dimension: self.iconDimension.width,
-      color: self.tabForegroundColor
-
+      color: self.foregroundColor
     )
     self.selectedCloseButtonImage = Icon.close.asImage(
       dimension: self.iconDimension.width,
-      color: self.tabForegroundColor
+      color: self.foregroundColor
     )
   }
 }

VimR/VimR/MainWindow.swift

@@ -470,16 +470,16 @@ final class MainWindow: NSObject,
   private func set(tabsThemeWith _: Theme) {
     var tabsTheme = Tabs.Theme.default
 
-    tabsTheme.foregroundColor = self.theme.foreground
-    tabsTheme.backgroundColor = self.theme.background
+    tabsTheme.foregroundColor = self.theme.tabForeground
+    tabsTheme.backgroundColor = self.theme.tabBackground
 
     tabsTheme.separatorColor = self.theme.background.brightening(by: 0.75)
 
-    tabsTheme.selectedForegroundColor = self.theme.highlightForeground
-    tabsTheme.selectedBackgroundColor = self.theme.highlightBackground
+    tabsTheme.tabBarBackgroundColor = self.theme.tabBarBackground
+    tabsTheme.tabBarForegroundColor = self.theme.tabBarForeground
 
-    tabsTheme.tabBackgroundColor = self.theme.tabBackground
-    tabsTheme.tabForegroundColor = self.theme.tabForeground
+    tabsTheme.selectedForegroundColor = self.theme.selectedTabForeground
+    tabsTheme.selectedBackgroundColor = self.theme.selectedTabBackground
 
     tabsTheme.tabSelectedIndicatorColor = self.theme.highlightForeground
 

VimR/VimR/Theme.swift

@@ -49,6 +49,12 @@ struct Theme: CustomStringConvertible {
   var tabForeground = NSColor.selectedMenuItemTextColor
   var tabBackground = NSColor.selectedContentBackgroundColor
 
+  var tabBarForeground = NSColor.selectedMenuItemTextColor
+  var tabBarBackground = NSColor.selectedContentBackgroundColor
+
+  var selectedTabForeground = NSColor.selectedMenuItemTextColor
+  var selectedTabBackground = NSColor.selectedContentBackgroundColor
+
   var cssColor = NSColor(hex: "24292e")!
   var cssBackgroundColor = NSColor.white
   var cssA = NSColor(hex: "0366d6")!
@@ -61,12 +67,14 @@ struct Theme: CustomStringConvertible {
   var cssCodeColor = NSColor(hex: "24292e")!
   var cssCodeBackgroundColor = NSColor(hex: "1b1f23")!
 
-  public var description: String {
+ public var description: String {
     "Theme<" +
       "fg: \(self.foreground.hex), bg: \(self.background.hex), " +
-      "hl-fg: \(self.highlightForeground.hex), hl-bg: \(self.highlightBackground.hex)" +
-      "dir-fg: \(self.directoryForeground.hex)," +
-      "tab-bg: \(self.tabBackground.hex), tab-fg: \(self.tabForeground.hex)" +
+      "hl-fg: \(self.highlightForeground.hex), hl-bg: \(self.highlightBackground.hex), " +
+      "dir-fg: \(self.directoryForeground.hex), " +
+      "tab-fg: \(self.tabForeground.hex), tab-bg: \(self.tabBackground.hex), " +
+      "tabfill-fg: \(self.tabBarForeground.hex), tabfill-bg: \(self.tabBarBackground.hex), " +
+      "tabsel-bg: \(self.selectedTabBackground.hex), tabsel-fg: \(self.selectedTabForeground.hex)" +
       ">"
   }
 
@@ -84,6 +92,12 @@ struct Theme: CustomStringConvertible {
     self.tabBackground = nvimTheme.tabBackground
     self.tabForeground = nvimTheme.tabForeground
 
+    self.tabBarBackground = nvimTheme.tabBarBackground
+    self.tabBarForeground = nvimTheme.tabBarForeground
+
+    self.selectedTabBackground = nvimTheme.selectedTabBackground
+    self.selectedTabForeground = nvimTheme.selectedTabForeground
+
     self.updateCssColors(additionalColorDict)
   }