Make Ruler look more like Xcode by creating custom font. Make ruler font and ruler Inset scale with text font size. (#170)

<!--- IMPORTANT: If this PR addresses multiple unrelated issues, it will be closed until separated. --> ### Description This PR adds a customized SF Pro Font which aims to look like the Xcode Digits font. The ruler font and the ruler insets scale with the text font size. ### Related Issues <!--- REQUIRED: Tag all related issues (e.g. * #123) --> <!--- If this PR resolves the issue please specify (e.g. * closes #123) --> <!--- If this PR addresses multiple issues, these issues must be related to one other --> * closes #58 * closes #157 ### Checklist <!--- Add things that are not yet implemented above --> - [x] I read and understood the [contributing guide](https://github.com/CodeEditApp/CodeEdit/blob/main/CONTRIBUTING.md) as well as the [code of conduct](https://github.com/CodeEditApp/CodeEdit/blob/main/CODE_OF_CONDUCT.md) - [x] The issues this PR addresses are related to each other - [x] My changes generate no new warnings - [x] My code builds and runs on my machine - [x] My changes are all related to the related issue above - [x] I documented my code ### Screenshots <!--- REQUIRED: if issue is UI related --> PointSize 13: Xcode left, CodeEdit Right: <img width="73" alt="image" src="https://user-images.githubusercontent.com/82230675/227798735-1041b4a0-7aa9-4e3e-8c73-a8993427e862.png"> PointSize 20: Xcode left, CodeEdit Right: <img width="162" alt="image" src="https://user-images.githubusercontent.com/82230675/227799017-87c08fb7-bac5-4a63-8fb2-b0bf4b0f3f0b.png"> <!--- IMPORTANT: Fill out all required fields. Otherwise we might close this PR temporarily --> --------- Co-authored-by: Lukas Pistrol <l.pistrol@gmail.com>

Author: Eliulm

Package.swift

@@ -1,11 +1,11 @@
-// swift-tools-version: 5.6
+// swift-tools-version: 5.7
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
  name: "CodeEditTextView",
- platforms: [.macOS(.v12)],
+ platforms: [.macOS(.v13)],
  products: [
  .library(
  name: "CodeEditTextView",

Sources/CodeEditTextView/Controller/STTextViewController.swift

@@ -130,9 +130,9 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
  rulerView.textColor = .secondaryLabelColor
  rulerView.drawSeparator = false
  rulerView.baselineOffset = baselineOffset
- rulerView.font = NSFont.monospacedDigitSystemFont(ofSize: 9.5, weight: .regular)
+ rulerView.font = rulerFont
  rulerView.selectedLineHighlightColor = theme.lineHighlight
- rulerView.rulerInsets = STRulerInsets(leading: 20, trailing: 8)
+ rulerView.rulerInsets = STRulerInsets(leading: rulerFont.pointSize * 1.6, trailing: 8)
 
  if self.isEditable == false {
  rulerView.selectedLineTextColor = nil
@@ -255,6 +255,8 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
  rulerView?.selectedLineHighlightColor = theme.lineHighlight
  rulerView?.baselineOffset = baselineOffset
  rulerView.highlightSelectedLine = isEditable
+ rulerView?.rulerInsets = STRulerInsets(leading: rulerFont.pointSize * 1.6, trailing: 8)
+ rulerView?.font = rulerFont
 
  if let scrollView = view as? NSScrollView {
  scrollView.drawsBackground = useThemeBackground

Sources/CodeEditTextView/Extensions/NSFont+RulerFont.swift

@@ -0,0 +1,42 @@
+//
+// NSFont+RulerFont.swift
+// 
+//
+// Created by Elias Wahl on 17.03.23.
+//
+
+import Foundation
+import AppKit
+
+extension STTextViewController {
+ var rulerFont: NSFont {
+ let fontSize: Double = (font.pointSize - 1) + 0.25
+ let fontAdvance: Double = font.pointSize * 0.49 + 0.1
+ let fontWeight = NSFont.Weight(rawValue: font.pointSize * 0.00001 + 0.0001)
+ let fontWidth = NSFont.Width(rawValue: -0.13)
+
+ let font = NSFont.systemFont(ofSize: fontSize, weight: fontWeight, width: fontWidth)
+
+ /// Set the open four
+ let alt4: [NSFontDescriptor.FeatureKey: Int] = [
+ .selectorIdentifier: kStylisticAltOneOnSelector,
+ .typeIdentifier: kStylisticAlternativesType
+ ]
+
+ /// Set alternate styling for 6 and 9
+ let alt6and9: [NSFontDescriptor.FeatureKey: Int] = [
+ .selectorIdentifier: kStylisticAltTwoOnSelector,
+ .typeIdentifier: kStylisticAlternativesType
+ ]
+
+ /// Make all digits monospaced
+ let monoSpaceDigits: [NSFontDescriptor.FeatureKey: Int] = [
+ .selectorIdentifier: 0,
+ .typeIdentifier: kNumberSpacingType
+ ]
+
+ let features = [alt4, alt6and9, monoSpaceDigits]
+ let descriptor = font.fontDescriptor.addingAttributes([.featureSettings: features, .fixedAdvance: fontAdvance])
+ return NSFont(descriptor: descriptor, size: 0) ?? font
+ }
+}