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[common] Implement a cute error screen when the shell fails to launch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| // | ||
| // ColorBars.swift | ||
| // NewTerm Common | ||
| // | ||
| // Created by Adam Demasi on 23/9/21. | ||
| // | ||
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| import Foundation | ||
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| struct ColorBars { | ||
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| private struct RGB: CustomStringConvertible { | ||
| var r: Int, g: Int, b: Int | ||
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| init(_ r: Int, _ g: Int, _ b: Int) { | ||
| self.r = r | ||
| self.g = g | ||
| self.b = b | ||
| } | ||
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| var description: String { "\(r);\(g);\(b)" } | ||
| } | ||
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| private static let bars: [[RGB]] = [ | ||
| [RGB(192, 192, 192), RGB(192, 192, 0), RGB( 0, 192, 192), RGB( 0, 192, 0), RGB(192, 0, 192), RGB(192, 0, 0), RGB( 0, 0, 192)], | ||
| [RGB( 0, 0, 192), RGB( 19, 19, 19), RGB(192, 0, 192), RGB( 19, 19, 19), RGB( 0, 192, 192), RGB( 19, 19, 19), RGB(192, 192, 192)], | ||
| [RGB( 0, 33, 76), RGB(255, 255, 255), RGB( 50, 0, 106), RGB( 19, 19, 19), RGB( 9, 9, 9), RGB( 19, 19, 19), RGB( 29, 29, 29), RGB( 19, 19, 19)] | ||
| ] | ||
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| static func render(screenSize: ScreenSize, message: String) -> Data { | ||
| // Don’t bother drawing if the screen is too small | ||
| if screenSize.cols < 7 || screenSize.rows < 10 { | ||
| return Data() | ||
| } | ||
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| // Draw color bars | ||
| let firstSectionSize = ScreenSize(cols: UInt(Double(screenSize.cols) / 7), | ||
| rows: UInt(Double(screenSize.rows) * 0.66)) | ||
| let thirdSectionSize = ScreenSize(cols: UInt(Double(screenSize.cols) / 6), | ||
| rows: UInt(Double(screenSize.rows) * 0.25)) | ||
| let secondSectionSize = ScreenSize(cols: UInt(Double(screenSize.cols) / 7), | ||
| rows: screenSize.rows - firstSectionSize.rows - thirdSectionSize.rows - 1) | ||
| var data = "\u{1b}c".data(using: .utf8)! | ||
| let space = String(repeating: " ", count: Int(firstSectionSize.cols)) | ||
| for _ in 0..<firstSectionSize.rows { | ||
| for color in bars[0] { | ||
| data.append("\u{1b}[48;2;\(color)m\(space)".data(using: .utf8)!) | ||
| } | ||
| data.append("\u{1b}[0m\r\n".data(using: .utf8)!) | ||
| } | ||
| for _ in 0..<secondSectionSize.rows { | ||
| for color in bars[1] { | ||
| data.append("\u{1b}[48;2;\(color)m\(space)".data(using: .utf8)!) | ||
| } | ||
| data.append("\u{1b}[0m\r\n".data(using: .utf8)!) | ||
| } | ||
| let finalSpace = String(repeating: " ", count: Int(thirdSectionSize.cols)) | ||
| let finalInnerWidth = Int(Double(thirdSectionSize.cols) / 3) | ||
| let finalInnerSpace = String(repeating: " ", count: finalInnerWidth) | ||
| for _ in 0..<thirdSectionSize.rows { | ||
| for i in 0..<bars[2].count { | ||
| // Special case: There is a gradient of 3 colors in the second-last rectangle. | ||
| let space = i >= 4 && i <= 6 ? finalInnerSpace : finalSpace | ||
| data.append("\u{1b}[48;2;\(bars[2][i])m\(space)".data(using: .utf8)!) | ||
| } | ||
| data.append("\u{1b}[0m\r\n".data(using: .utf8)!) | ||
| } | ||
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| // Draw error text | ||
| let textPosition = ScreenSize(cols: UInt(max(0, Double((Int(firstSectionSize.cols * 7) - message.count + 2) / 2).rounded(.toNearestOrEven))), | ||
| rows: UInt(Double(screenSize.rows / 2).rounded(.down))) | ||
| data.append("\u{1b}[\(textPosition.rows);\(textPosition.cols)H\u{1b}[1;7m \(message) \u{1b}[m\u{1b}[\(screenSize.cols);0H".data(using: .utf8)!) | ||
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| return data | ||
| } | ||
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| } |
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