Add primitive auto indent

src/edit/editor.rs

@@ -23,6 +23,7 @@ pub struct Editor {
     cursor_x_opt: Option<i32>,
     select_opt: Option<Cursor>,
     cursor_moved: bool,
+    auto_indent: bool,
     tab_width: u16,
     change: Option<Change>,
 }
@@ -36,6 +37,7 @@ impl Editor {
             cursor_x_opt: None,
             select_opt: None,
             cursor_moved: false,
+            auto_indent: false,
             tab_width: 4,
             change: None,
         }
@@ -258,6 +260,14 @@ impl Edit for Editor {
         }
     }
 
+    fn auto_indent(&self) -> bool {
+        self.auto_indent
+    }
+
+    fn set_auto_indent(&mut self, auto_indent: bool) {
+        self.auto_indent = auto_indent;
+    }
+
     fn tab_width(&self) -> u16 {
         self.tab_width
     }
@@ -596,7 +606,24 @@ impl Edit for Editor {
                 }
             }
             Action::Enter => {
-                self.insert_string("\n", None);
+                //TODO: what about indenting more after opening brackets or parentheses?
+                if self.auto_indent {
+                    let mut string = String::from("\n");
+                    {
+                        let line = &self.buffer.lines[self.cursor.line];
+                        let text = line.text();
+                        for c in text.chars() {
+                            if c.is_whitespace() {
+                                string.push(c);
+                            } else {
+                                break;
+                            }
+                        }
+                    }
+                    self.insert_string(&string, None);
+                } else {
+                    self.insert_string("\n", None);
+                }
 
                 // Ensure line is properly shaped and laid out (for potential immediate commands)
                 self.buffer.line_layout(font_system, self.cursor.line);

src/edit/mod.rs

@@ -164,6 +164,12 @@ pub trait Edit {
     /// Set the current selection position
     fn set_select_opt(&mut self, select_opt: Option<Cursor>);
 
+    /// Get the current automatic indentation setting
+    fn auto_indent(&self) -> bool;
+
+    /// Enable or disable automatic indentation
+    fn set_auto_indent(&mut self, auto_indent: bool);
+
     /// Get the current tab width
     fn tab_width(&self) -> u16;
 

src/edit/syntect.rs

@@ -166,6 +166,14 @@ impl<'a> Edit for SyntaxEditor<'a> {
         self.editor.set_select_opt(select_opt);
     }
 
+    fn auto_indent(&self) -> bool {
+        self.editor.auto_indent()
+    }
+
+    fn set_auto_indent(&mut self, auto_indent: bool) {
+        self.editor.set_auto_indent(auto_indent);
+    }
+
     fn tab_width(&self) -> u16 {
         self.editor.tab_width()
     }

src/edit/vi.rs

@@ -272,6 +272,14 @@ impl<'a> Edit for ViEditor<'a> {
         self.editor.set_select_opt(select_opt);
     }
 
+    fn auto_indent(&self) -> bool {
+        self.editor.auto_indent()
+    }
+
+    fn set_auto_indent(&mut self, auto_indent: bool) {
+        self.editor.set_auto_indent(auto_indent);
+    }
+
     fn tab_width(&self) -> u16 {
         self.editor.tab_width()
     }