refactor to have state and add test

.gitignore

@@ -1,3 +1,5 @@
 edit
 *.ttf
 .build
+main
+test

edit.jai

@@ -1,21 +1,34 @@
+// Todos:
+// - move by word
+// - select text
+// - copy selected text
+// - cut selected text
+// - move line up
+// - move line down
+// - duplicate line
+// - refactor to make cursor_x be aligned with characters themselves
+
+
 FPS          :: 60;
 MS_PER_FRAME :: 1000 / FPS;
 
-buffer: string;
+State :: struct {
-lines: [..][..]u8;
+    file_name: string;
-line_height: int;
     
-my_font: *Simp.Dynamic_Font;
+    cursor_x: int;
+    cursor_y: int;
     
-window_width  := 800;
+    window_width: int;
-window_height := 600;
+    window_height: int;
     
-first_line := 0;
+    buffer: string;
+    lines: [..][..]u8;
+    line_height: int;
+    first_line: int;
 
-cursor_x := 0;
+    my_font: *Simp.Dynamic_Font;
-cursor_y := 0;
+    dt: int;
-
+}
-file_name: string;
 
 White :: Vector4.{1, 1, 1, 1};
 
@@ -32,33 +45,32 @@ Special_Character_Lookup : [10]u8 : .[
     xx #char "(",
 ];
 
-main :: () {
+run_editor :: (file_name: string) {
-    args := get_command_line_arguments();
+    state: State;
-    assert(args.count == 2, "The file name must be passed as a CLI argument");
+    state.window_width  = 800;
+    state.window_height = 600;
+    state.file_name = file_name;
+    window := create_window(state.window_width, state.window_height, state.file_name);
 
-    file_name = args[1];
+    my_init_fonts(*state);
-    window_name := file_name;
-    window := create_window(window_width, window_height, window_name);
-
-    my_init_fonts();
 
     Simp.set_render_target(window);
 
     should_quit := false;
     prev := get_time();
 
-    assert(read_file_lines(file_name), "Must be able to read file!");
+    assert(read_file_lines(*state, state.file_name), "Must be able to read file!");
 
     while !should_quit {
         reset_temporary_storage();
 
         now := get_time();
-        dt := now - prev;
+        state.dt = now - prev;
         prev = now;
 
         Input.update_window_events();
 
-        handle_window_resizes(window);
+        handle_window_resizes(*state, window);
 
         for event : Input.events_this_frame {
             if event.type == .QUIT {
@@ -70,13 +82,13 @@ main :: () {
                 if event.key_code == {
                     case .ESCAPE; should_quit = true;
 
-                    case .BACKSPACE; handle_backspace();
+                    case .BACKSPACE; handle_backspace(*state);
-                    case .ENTER;     handle_enter();
+                    case .ENTER;     handle_enter(*state);
 
                     case .ARROW_UP;    #through;
                     case .ARROW_DOWN;  #through;
                     case .ARROW_LEFT;  #through;
-                    case .ARROW_RIGHT; handle_arrow(event.key_code);
+                    case .ARROW_RIGHT; handle_arrow(*state, event);
                 }
 
                 if #char "A" <= event.key_code && event.key_code <= #char "z" {
@@ -88,22 +100,22 @@ main :: () {
                     if event.ctrl_pressed {
                         if event.key_code == {
                             case #char "S"; #through;
-                            case #char "s"; handle_save();
+                            case #char "s"; handle_save(*state);
                         }
                     } else {
-                        insert_character_at_cursor(cast(u8) key);
+                        insert_character_at_cursor(*state, cast(u8) key);
                     }
                 } else if 33 <= event.key_code && event.key_code <= 126 {
                     // NOTE: this doesn't quite work for some keys, like ` or []
                     key := event.key_code;
-                    insert_character_at_cursor(cast(u8) key);
+                    insert_character_at_cursor(*state, cast(u8) key);
                 }
             }
         }
 
         Simp.clear_render_target(.0, .0, .0, 1);
 
-        render_edit_buffer();
+        render_edit_buffer(state);
 
         Simp.swap_buffers(window);
 
@@ -114,8 +126,8 @@ main :: () {
     }
 }
 
-render_edit_buffer :: () {
+render_edit_buffer :: (using state: State) {
-    visible_lines := get_visible_lines();
+    visible_lines := get_visible_lines(state);
     for line_buffer: visible_lines {
         Simp.set_shader_for_text();
 
@@ -154,13 +166,13 @@ render_edit_buffer :: () {
     }
 }
 
-insert_character_at_cursor :: (char: u8) {
+insert_character_at_cursor :: (using state: *State, char: u8) {
-    line := *get_visible_lines()[cursor_y];
+    line := *get_visible_lines(state)[cursor_y];
     array_insert_at(line, char, cursor_x);
     cursor_x += 1;
 }
 
-handle_save :: () {
+handle_save :: (using state: *State) {
     out_builder: String_Builder;
     init_string_builder(*out_builder);
 
@@ -177,7 +189,7 @@ handle_save :: () {
     write_entire_file(out_file_name, content);
 }
 
-handle_window_resizes :: (window: Window_Type) {
+handle_window_resizes :: (using state: *State, window: Window_Type) {
     for Input.get_window_resizes() {
         Simp.update_window(it.window);
         if it.window == window {
@@ -187,13 +199,13 @@ handle_window_resizes :: (window: Window_Type) {
             window_height = it.height;
 
             if should_reinit {
-                my_init_fonts();
+                my_init_fonts(state);
             }
         }
     }
 }
 
-handle_enter :: () {
+handle_enter :: (using state: *State) {
     cursor_line_index := cursor_y + first_line;
     current_line := *lines[cursor_line_index];
 
@@ -203,11 +215,11 @@ handle_enter :: () {
     array_insert_at(*lines, new_line, cursor_line_index + 1);
     current_line.count = cursor_x;
 
-    handle_arrow(.ARROW_DOWN);
+    handle_arrow(state, .ARROW_DOWN);
     cursor_x = 0;
 }
 
-handle_backspace :: () {
+handle_backspace :: (using state: *State) {
     if cursor_x == 0 && cursor_y == 0 && first_line == 0 {
         return;
     }
@@ -219,7 +231,7 @@ handle_backspace :: () {
         prev_count := prev_line.count;
         array_add(prev_line, current_line.*);
         array_remove_at(*lines, cursor_line_index);
-        handle_arrow(.ARROW_UP);
+        handle_arrow(state, .ARROW_UP);
         cursor_x = prev_count;
     } else {
         array_remove_at(current_line, cursor_x - 1);
@@ -227,8 +239,13 @@ handle_backspace :: () {
     }
 }
 
-handle_arrow :: (key_code: Input.Key_Code) {
+handle_arrow :: (state: *State, key_code: Input.Key_Code) {
-    visible_lines := get_visible_lines();
+    handle_arrow(state, .{key_code=key_code});
+}
+
+handle_arrow :: (using state: *State, using event: Input.Event) {
+    visible_lines := get_visible_lines(state);
+
 
     if key_code == {
         case .ARROW_UP;    
@@ -252,6 +269,7 @@ handle_arrow :: (key_code: Input.Key_Code) {
                 len := prev_line.count;
                 cursor_y = max(0, cursor_y - 1);
                 cursor_x = len;
+            } else if cursor_x != 0 && ctrl_pressed {
             } else if cursor_x != 0 {
                 cursor_x -= 1;
 	    }
@@ -261,13 +279,14 @@ handle_arrow :: (key_code: Input.Key_Code) {
             if cursor_x == len {
                 cursor_x = 0;
                 cursor_y += 1;
+            } else if ctrl_pressed {
             } else {
                 cursor_x += 1;
 	    }
     }
 }
 
-get_visible_lines :: () -> [][..]u8 {
+get_visible_lines :: (using state: State) -> [][..]u8 {
     num_lines_in_screen := window_height / line_height - 1;
     return array_view(lines, first_line, num_lines_in_screen);
 }
@@ -328,7 +347,7 @@ get_time :: () -> s64 {
     return val;
 }
 
-read_file_lines :: (file_path: string) -> bool {
+read_file_lines :: (using state: *State, file_path: string) -> bool {
     file_contents, ok := read_entire_file(file_path);
     if !ok return ok;
 
@@ -348,7 +367,7 @@ read_file_lines :: (file_path: string) -> bool {
     return ok;
 }
 
-my_init_fonts :: () {
+my_init_fonts :: (using state: *State) {
     line_height = 16;
     base_path := path_strip_filename(get_path_of_running_executable());
 

main.jai

@@ -0,0 +1,10 @@
+main :: () {
+    args := get_command_line_arguments();
+    assert(args.count == 2, "The file name must be passed as a CLI argument");
+
+    file_name := args[1];
+    run_editor(file_name);
+}
+
+#load "edit.jai";
+#import "Basic";

test.jai

@@ -0,0 +1,5 @@
+main :: () {
+}
+
+#load "edit.jai";
+#import "Basic";