Move cursor movement into separate functions

4 files changed, 62 insertions, 45 deletions

diff --git a/editor.c b/editor.c
index d08a961..58f18c9 100644
--- a/editor.c
+++ b/editor.c
@@ -51,6 +51,49 @@ char* editor_prompt(struct editor_state* editor, char* prompt, void (*callback)(
 	return NULL;
 }
 
+void editor_move_left(struct editor_state *editor)
+{
+	if (editor->cursor_x != 0) {
+		editor->cursor_x--;
+	} else if (editor->cursor_y > 0) {
+		editor->cursor_y--;
+		editor->cursor_x = editor->rows[editor->cursor_y].size;
+	}
+}
+
+void editor_move_right(struct editor_state *editor)
+{
+	struct editor_row* row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
+	if (row && editor->cursor_x < row->size) {
+		editor->cursor_x++;
+	} else if (row && editor->cursor_x == row->size) {
+		editor->cursor_y++;
+		editor->cursor_x = 0;
+	}
+}
+
+void editor_move_up(struct editor_state *editor)
+{
+	if (editor->cursor_y != 0)
+		editor->cursor_y--;
+
+	struct editor_row *row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
+	int row_length = row ? row->size : 0;
+	if (editor->cursor_x > row_length)
+		editor->cursor_x = row_length;
+}
+
+void editor_move_down(struct editor_state *editor)
+{
+	if (editor->cursor_y != editor->row_count - 1)
+		editor->cursor_y++;
+
+	struct editor_row *row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
+	int row_length = row ? row->size : 0;
+	if (editor->cursor_x > row_length)
+		editor->cursor_x = row_length;
+}
+
 void editor_insert_char(struct editor_state* editor, int c)
 {
 	if (editor->cursor_y == editor->row_count)
diff --git a/editor.h b/editor.h
index 8b42b7f..63f6c76 100644
--- a/editor.h
+++ b/editor.h
@@ -23,9 +23,13 @@ struct editor_state {
 void init_editor(struct editor_state* editor);
 
 void editor_set_status_message(struct editor_state* editor, const char* format, ...);
-void editor_refresh_screen(struct editor_state* editor);
 char* editor_prompt(struct editor_state* editor, char* prompt, void (*callback)(struct editor_state*, char*, int));
 
+void editor_move_left(struct editor_state *);
+void editor_move_right(struct editor_state *);
+void editor_move_up(struct editor_state *);
+void editor_move_down(struct editor_state *);
+
 void editor_insert_char(struct editor_state* editor, int c);
 void editor_insert_newline(struct editor_state* editor);
 void editor_delete_char(struct editor_state* editor);
diff --git a/input.c b/input.c
index 28f61f4..50191e7 100644
--- a/input.c
+++ b/input.c
@@ -7,41 +7,6 @@
 #include "file.h"
 #include "row.h"
 
-void editor_move_cursor(struct editor_state* editor, int key)
-{
-	struct editor_row* row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
-	
-	switch (key) {
-		case ARROW_LEFT:
-			if (editor->cursor_x != 0) {
-				editor->cursor_x--;
-			} else if (editor->cursor_y > 0) {
-				editor->cursor_y--;
-				editor->cursor_x = editor->rows[editor->cursor_y].size;
-			}
-			break;
-		case ARROW_RIGHT:
-			if (row && editor->cursor_x < row->size) {
-				editor->cursor_x++;
-			} else if (row && editor->cursor_x == row->size) {
-				editor->cursor_y++;
-				editor->cursor_x = 0;
-			}
-			break;
-		case ARROW_UP:
-			if (editor->cursor_y != 0) editor->cursor_y--;
-			break;
-		case ARROW_DOWN:
-			if (editor->cursor_y != editor->row_count - 1) editor->cursor_y++;
-			break;
-	}
-
-	row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
-	int row_length = row ? row->size : 0;
-	if (editor->cursor_x > row_length)
-		editor->cursor_x = row_length;
-}
-
 void editor_process_keypress(struct editor_state* editor, int c)
 {
 	static int quit_message = 1;
@@ -74,7 +39,7 @@ void editor_process_keypress(struct editor_state* editor, int c)
 		case BACKSPACE:
 		case DELETE_KEY:
 			if (c == DELETE_KEY) 
-				editor_move_cursor(editor, ARROW_RIGHT);
+				editor_move_right(editor);
 			editor_delete_char(editor);
 			break;
 		case PAGE_UP:
@@ -87,17 +52,24 @@ void editor_process_keypress(struct editor_state* editor, int c)
 					if (editor->cursor_y > editor->row_count)
 						editor->cursor_y = editor->row_count;
 				}
-
-				int times = editor->screen_rows;
-				while (times--)
-					editor_move_cursor(editor, c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
+				/*
+				 * TODO: Reimplement pageup/pagedown, this time by scrolling the
+				 * screen without necessarily changing the position of the
+				 * cursor relative to the screen
+				 */
 			}
 			break;
 		case ARROW_UP:
+			editor_move_up(editor);
+			break;
 		case ARROW_DOWN:
+			editor_move_down(editor);
+			break;
 		case ARROW_LEFT:
+			editor_move_left(editor);
+			break;
 		case ARROW_RIGHT:
-			editor_move_cursor(editor, c);
+			editor_move_right(editor);
 			break;
 		case CTRL_KEY('l'):
 		case '\x1b':
diff --git a/input.h b/input.h
index 4b7eb05..33f349f 100644
--- a/input.h
+++ b/input.h
@@ -18,8 +18,6 @@ enum editor_key {
 
 #define CTRL_KEY(k) ((k) & 0x1f)
 
-int editor_read_key();
-void editor_move_cursor(struct editor_state* editor, int key);
-void editor_process_keypress(struct editor_state* editor, int keycode);
+void editor_process_keypress(struct editor_state *editor, int keycode);
 
 #endif