Feat/Select editor font

Cargo.toml

@@ -17,6 +17,7 @@ windows = { version = "0.54.0", features = [
   "Win32_System_LibraryLoader",
   "Win32_System_Memory",
   "Win32_System_Ole",
+  "Win32_System_SystemInformation",
   "Win32_System_Threading",
   "Win32_UI_Controls",
   "Win32_UI_Controls_Dialogs",

src/app/settings.rs

@@ -25,6 +25,10 @@ pub const DEFAULT_ZOOM_LEVEL: i32 = 0;
 /// Scintilla's supported zoom range (points added to the base font size).
 pub const MIN_ZOOM_LEVEL: i32 = -10;
 pub const MAX_ZOOM_LEVEL: i32 = 20;
+pub const DEFAULT_EDITOR_FONT_NAME: &str = "Consolas";
+pub const DEFAULT_EDITOR_FONT_SIZE: i32 = 11;
+pub const MIN_EDITOR_FONT_SIZE: i32 = 6;
+pub const MAX_EDITOR_FONT_SIZE: i32 = 72;
 
 #[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq, Eq, Default)]
 #[serde(rename_all = "lowercase")]
@@ -73,6 +77,13 @@ pub struct UiSettings {
     /// [`MIN_ZOOM_LEVEL`]..=[`MAX_ZOOM_LEVEL`].
     #[serde(default)]
     pub zoom_level: i32,
+    /// `settings.json`: editor font family name (e.g. "Consolas").
+    #[serde(default = "default_editor_font_name")]
+    pub editor_font_name: String,
+    /// `settings.json`: editor base font size in points, clamped to
+    /// [`MIN_EDITOR_FONT_SIZE`]..=[`MAX_EDITOR_FONT_SIZE`].
+    #[serde(default = "default_editor_font_size")]
+    pub editor_font_size: i32,
 }
 
 impl Default for UiSettings {
@@ -89,6 +100,8 @@ impl Default for UiSettings {
             large_file_disable_smart_highlight: DEFAULT_LARGE_FILE_DISABLE_SMART_HIGHLIGHT,
             recent_files: Vec::new(),
             zoom_level: DEFAULT_ZOOM_LEVEL,
+            editor_font_name: DEFAULT_EDITOR_FONT_NAME.to_string(),
+            editor_font_size: DEFAULT_EDITOR_FONT_SIZE,
         }
     }
 }
@@ -121,6 +134,10 @@ struct UiSettingsWire {
     recent_files: Vec<String>,
     #[serde(default)]
     zoom_level: i32,
+    #[serde(default = "default_editor_font_name")]
+    editor_font_name: String,
+    #[serde(default = "default_editor_font_size")]
+    editor_font_size: i32,
 }
 
 impl From<UiSettingsWire> for UiSettings {
@@ -143,6 +160,8 @@ impl From<UiSettingsWire> for UiSettings {
                 .unwrap_or(DEFAULT_LARGE_FILE_DISABLE_SMART_HIGHLIGHT),
             recent_files: value.recent_files,
             zoom_level: value.zoom_level,
+            editor_font_name: value.editor_font_name,
+            editor_font_size: value.editor_font_size,
         }
     }
 }
@@ -174,6 +193,12 @@ impl UiSettings {
             .clamp(MIN_LARGE_FILE_THRESHOLD_MB, MAX_LARGE_FILE_THRESHOLD_MB);
         self.recent_files.truncate(MAX_RECENT_FILES);
         self.zoom_level = self.zoom_level.clamp(MIN_ZOOM_LEVEL, MAX_ZOOM_LEVEL);
+        if self.editor_font_name.trim().is_empty() {
+            self.editor_font_name = DEFAULT_EDITOR_FONT_NAME.to_string();
+        }
+        self.editor_font_size = self
+            .editor_font_size
+            .clamp(MIN_EDITOR_FONT_SIZE, MAX_EDITOR_FONT_SIZE);
         self
     }
 }
@@ -222,6 +247,14 @@ fn default_editor_dark() -> bool {
     DEFAULT_EDITOR_DARK
 }
 
+fn default_editor_font_name() -> String {
+    DEFAULT_EDITOR_FONT_NAME.to_string()
+}
+
+fn default_editor_font_size() -> i32 {
+    DEFAULT_EDITOR_FONT_SIZE
+}
+
 fn default_smart_highlight_match_case() -> bool {
     DEFAULT_SMART_HIGHLIGHT_MATCH_CASE
 }
@@ -351,6 +384,8 @@ mod tests {
             large_file_disable_smart_highlight: true,
             recent_files: vec!["C:\\a.txt".to_string(), "C:\\b.md".to_string()],
             zoom_level: 3,
+            editor_font_name: "Consolas".to_string(),
+            editor_font_size: 11,
         };
         let json = serde_json::to_string_pretty(&settings).unwrap();
         assert!(json.contains("\"tab_placement\": \"right\""));

src/editor/scintilla.rs

@@ -18,6 +18,7 @@ const SCI_SETCODEPAGE: u32 = 2037;
 const SCI_SETTEXT: u32 = 2181;
 const SCI_GETTEXT: u32 = 2182;
 const SCI_INSERTTEXT: u32 = 2003;
+const SCI_REPLACESEL: u32 = 2170;
 const SCI_GETLENGTH: u32 = 2006;
 const SCI_GETCHARAT: u32 = 2007;
 const SCI_GETCURRENTPOS: u32 = 2008;
@@ -607,8 +608,8 @@ pub fn create_window(parent: HWND, instance: HINSTANCE) -> Result<HWND> {
     Ok(hwnd)
 }
 
-pub fn apply_lexer(hwnd: HWND, lexer: LexerKind, dark: bool) {
-    apply_base_theme(hwnd, dark);
+pub fn apply_lexer(hwnd: HWND, lexer: LexerKind, dark: bool, font_name: &str, font_size: i32) {
+    apply_base_theme(hwnd, dark, font_name, font_size);
     set_lexer_by_name(hwnd, lexer_name(lexer));
     clear_keywords(hwnd);
     apply_fold_properties(hwnd);
@@ -673,6 +674,16 @@ pub fn insert_text(hwnd: HWND, pos: usize, text: &str) {
     send_message(hwnd, SCI_INSERTTEXT, pos, text.as_ptr() as isize);
 }
 
+/// Replaces the current selection (or inserts at the caret if the selection
+/// is empty) with `text`, then leaves the caret positioned after it — the
+/// same behavior as typing or pasting.
+pub fn replace_selection(hwnd: HWND, text: &str) {
+    let Ok(text) = CString::new(text) else {
+        return;
+    };
+    send_message(hwnd, SCI_REPLACESEL, 0, text.as_ptr() as isize);
+}
+
 /// The newline sequence matching the document's current EOL mode.
 pub fn eol_string(hwnd: HWND) -> &'static str {
     match get_eol_mode(hwnd) {
@@ -968,7 +979,7 @@ fn lexer_name(lexer: LexerKind) -> &'static str {
     }
 }
 
-fn apply_base_theme(hwnd: HWND, dark: bool) {
+fn apply_base_theme(hwnd: HWND, dark: bool, font_name: &str, font_size: i32) {
     let (fore, back, sel_back, caret, caret_line) = if dark {
         (
             COLOR_DARK_FORE,
@@ -988,8 +999,8 @@ fn apply_base_theme(hwnd: HWND, dark: bool) {
     };
     set_style_fore(hwnd, STYLE_DEFAULT, fore);
     set_style_back(hwnd, STYLE_DEFAULT, back);
-    set_style_size(hwnd, STYLE_DEFAULT, 11);
-    set_style_font(hwnd, STYLE_DEFAULT, "Consolas");
+    set_style_size(hwnd, STYLE_DEFAULT, font_size.max(1) as usize);
+    set_style_font(hwnd, STYLE_DEFAULT, font_name);
     send_message(hwnd, SCI_STYLECLEARALL, 0, 0);
     send_message(hwnd, SCI_SETSELFORE, 1, fore as isize);
     send_message(hwnd, SCI_SETSELBACK, 1, sel_back as isize);