add FileFormat enum and file tracking to AppState

src/AppState.swift

@@ -1,6 +1,82 @@
 import Foundation
 import Combine
 
+enum FileFormat: String, CaseIterable {
+    case markdown, csv, json, toml, yaml, xml, svg
+    case rust, c, cpp, objc
+    case javascript, typescript, jsx, tsx
+    case html, css, scss, less
+    case python, go, ruby, php, lua
+    case shell, java, kotlin, swift, zig, sql
+    case makefile, dockerfile
+    case config, lock, plainText
+    case unknown
+
+    static func from(extension ext: String) -> FileFormat {
+        switch ext.lowercased() {
+        case "md", "markdown", "mdown": return .markdown
+        case "csv": return .csv
+        case "json": return .json
+        case "toml": return .toml
+        case "yaml", "yml": return .yaml
+        case "xml": return .xml
+        case "svg": return .svg
+        case "rs": return .rust
+        case "c": return .c
+        case "cpp", "cc", "cxx": return .cpp
+        case "h", "hpp", "hxx": return .cpp
+        case "m": return .objc
+        case "js": return .javascript
+        case "jsx": return .jsx
+        case "ts": return .typescript
+        case "tsx": return .tsx
+        case "html", "htm": return .html
+        case "css": return .css
+        case "scss": return .scss
+        case "less": return .less
+        case "py": return .python
+        case "go": return .go
+        case "rb": return .ruby
+        case "php": return .php
+        case "lua": return .lua
+        case "sh", "bash", "zsh", "fish": return .shell
+        case "java": return .java
+        case "kt", "kts": return .kotlin
+        case "swift": return .swift
+        case "zig": return .zig
+        case "sql": return .sql
+        case "mk": return .makefile
+        case "ini", "cfg", "conf", "env": return .config
+        case "lock": return .lock
+        case "txt", "text", "log": return .plainText
+        default: return .unknown
+        }
+    }
+
+    static func from(filename: String) -> FileFormat {
+        let lower = filename.lowercased()
+        if lower == "makefile" { return .makefile }
+        if lower == "dockerfile" { return .dockerfile }
+        let ext = (filename as NSString).pathExtension
+        if ext.isEmpty { return .unknown }
+        return from(extension: ext)
+    }
+
+    var isCode: Bool {
+        switch self {
+        case .rust, .c, .cpp, .objc, .javascript, .typescript, .jsx, .tsx,
+             .html, .css, .scss, .less, .python, .go, .ruby, .php, .lua,
+             .shell, .java, .kotlin, .swift, .zig, .sql, .makefile, .dockerfile:
+            return true
+        default:
+            return false
+        }
+    }
+
+    var isMarkdown: Bool { self == .markdown }
+    var isCSV: Bool { self == .csv }
+}
+
 class AppState: ObservableObject {
     @Published var documentText: String = "" {
         didSet {
@@ -16,6 +92,8 @@ class AppState: ObservableObject {
     @Published var currentNoteID: UUID
     @Published var selectedNoteIDs: Set<UUID> = []
     @Published var modified: Bool = false
+    @Published var currentFileURL: URL? = nil
+    @Published var currentFileFormat: FileFormat = .markdown
 
     private let bridge = RustBridge.shared
     private var autoSaveTimer: DispatchSourceTimer?
@@ -120,6 +198,8 @@ class AppState: ObservableObject {
         documentText = ""
         evalResults = [:]
         modified = false
+        currentFileURL = nil
+        currentFileFormat = .markdown
         refreshNoteList()
     }
 
@@ -162,6 +242,9 @@ class AppState: ObservableObject {
 
     func saveNote() {
         bridge.setText(currentNoteID, text: documentText)
+        if let url = currentFileURL {
+            let _ = bridge.saveNote(currentNoteID, path: url.path)
+        }
         let _ = bridge.cacheSave(currentNoteID)
         modified = false
         refreshNoteList()
@@ -169,6 +252,8 @@ class AppState: ObservableObject {
 
     func saveNoteToFile(_ url: URL) {
         let _ = bridge.saveNote(currentNoteID, path: url.path)
+        currentFileURL = url
+        currentFileFormat = FileFormat.from(filename: url.lastPathComponent)
         modified = false
     }
 
@@ -176,6 +261,8 @@ class AppState: ObservableObject {
         if let (id, text) = bridge.loadNote(path: url.path) {
             currentNoteID = id
             documentText = text
+            currentFileURL = url
+            currentFileFormat = FileFormat.from(filename: url.lastPathComponent)
             modified = false
             let _ = bridge.cacheSave(id)
             evaluate()