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import SwiftUI
/// Renders a unified diff string with syntax highlighting:
/// - Green background for added lines (+)
/// - Red background for removed lines (-)
/// - Gray for hunk headers (@@)
/// - File headers (--- / +++ / diff) in bold
struct DiffView: View {
let diff: String
var body: some View {
VStack(alignment: .leading, spacing: 12) {
ForEach(fileSections) { section in
DiffFileSectionView(section: section)
}
}
}
private var fileSections: [DiffFileSection] {
DiffFileSection.parse(from: normalizedDiff)
}
private var normalizedDiff: String {
diff
.replacingOccurrences(of: "\r\n", with: "\n")
.replacingOccurrences(of: "\r", with: "\n")
}
}
private struct DiffFileSectionView: View {
let section: DiffFileSection
@State private var isExpanded = true
var body: some View {
VStack(alignment: .leading, spacing: 0) {
Button {
isExpanded.toggle()
} label: {
HStack(spacing: 10) {
Image(systemName: isExpanded ? "chevron.down" : "chevron.right")
.font(.caption.weight(.semibold))
.foregroundStyle(.secondary)
.frame(width: 12)
Text(section.filename)
.font(.subheadline.weight(.semibold))
.foregroundStyle(.primary)
.lineLimit(1)
Spacer(minLength: 8)
Text(section.changeSummary)
.font(.caption.weight(.medium))
.foregroundStyle(.secondary)
}
.padding(.horizontal, 10)
.padding(.vertical, 8)
.contentShape(Rectangle())
}
.buttonStyle(.plain)
.background(Color(.tertiarySystemBackground))
if isExpanded {
DiffBlockView(lines: section.lines)
}
}
.clipShape(RoundedRectangle(cornerRadius: 8, style: .continuous))
.overlay {
RoundedRectangle(cornerRadius: 8, style: .continuous)
.strokeBorder(Color.primary.opacity(0.06))
}
}
}
private struct DiffBlockView: View {
let lines: [String]
var body: some View {
ScrollView(.horizontal, showsIndicators: false) {
LazyVStack(alignment: .leading, spacing: 0) {
ForEach(Array(lines.enumerated()), id: \.offset) { _, line in
DiffLineView(line: line)
}
}
.frame(minWidth: 0, maxWidth: .infinity, alignment: .leading)
}
.font(.system(.caption, design: .monospaced))
.background(Color(.secondarySystemBackground))
}
}
private struct DiffFileSection: Identifiable {
let id: String
let filename: String
let lines: [String]
let additions: Int
let deletions: Int
var changeSummary: String {
"+\(additions) -\(deletions)"
}
static func parse(from diff: String) -> [DiffFileSection] {
let lines = diff.components(separatedBy: "\n")
guard !lines.isEmpty else { return [] }
let boundaries = lines.enumerated().compactMap { index, line in
line.hasPrefix("diff --git ") ? index : nil
}
guard !boundaries.isEmpty else {
let section = makeSection(lines: lines, fallbackIndex: 0)
return section.lines.isEmpty ? [] : [section]
}
var sections: [DiffFileSection] = []
for (position, startIndex) in boundaries.enumerated() {
let endIndex = position + 1 < boundaries.count ? boundaries[position + 1] : lines.count
let sectionLines = Array(lines[startIndex..<endIndex])
let section = makeSection(lines: sectionLines, fallbackIndex: position)
if !section.lines.isEmpty {
sections.append(section)
}
}
return sections
}
private static func makeSection(lines: [String], fallbackIndex: Int) -> DiffFileSection {
let filename = fileName(from: lines) ?? "File \(fallbackIndex + 1)"
let additions = lines.filter { $0.hasPrefix("+") && !$0.hasPrefix("+++") }.count
let deletions = lines.filter { $0.hasPrefix("-") && !$0.hasPrefix("---") }.count
return DiffFileSection(
id: "\(fallbackIndex)-\(filename)",
filename: filename,
lines: lines,
additions: additions,
deletions: deletions
)
}
private static func fileName(from lines: [String]) -> String? {
if let diffHeader = lines.first(where: { $0.hasPrefix("diff --git ") }) {
let parts = diffHeader.split(separator: " ")
if let rhs = parts.last, rhs.hasPrefix("b/") {
return String(rhs.dropFirst(2))
}
}
if let plusHeader = lines.first(where: { $0.hasPrefix("+++ ") }) {
let path = String(plusHeader.dropFirst(4))
if path.hasPrefix("b/") {
return String(path.dropFirst(2))
}
return path
}
if let minusHeader = lines.first(where: { $0.hasPrefix("--- ") }) {
let path = String(minusHeader.dropFirst(4))
if path.hasPrefix("a/") {
return String(path.dropFirst(2))
}
return path
}
return nil
}
}
private struct DiffLineView: View {
let line: String
var body: some View {
Text(line.isEmpty ? " " : line)
.frame(maxWidth: .infinity, alignment: .leading)
.padding(.horizontal, 8)
.background(backgroundColor)
.foregroundStyle(foregroundColor)
.fontWeight(isHeader ? .semibold : .regular)
}
private var kind: DiffLineKind {
if line.hasPrefix("@@") { return .hunk }
if line.hasPrefix("+++") || line.hasPrefix("---") { return .fileHeader }
if line.hasPrefix("diff ") { return .fileHeader }
if line.hasPrefix("index ") { return .meta }
if line.hasPrefix("+") { return .added }
if line.hasPrefix("-") { return .removed }
return .context
}
private var backgroundColor: Color {
switch kind {
case .added: .green.opacity(0.15)
case .removed: .red.opacity(0.15)
case .hunk: .clear
case .fileHeader: .clear
case .meta: .clear
case .context: .clear
}
}
private var foregroundColor: Color {
switch kind {
case .added: .green
case .removed: .red
case .hunk: .secondary
case .meta: .secondary
default: .primary
}
}
private var isHeader: Bool {
kind == .fileHeader
}
}
private enum DiffLineKind {
case added
case removed
case hunk
case fileHeader
case meta
case context
}
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