Start implementing editor commands

This first step allows you to press the semicolon key to enter command
mode, where you can type into a command line. Currently, pressing enter
when in command mode will clear the command line but since there are no
commands implemented it doesn't matter what you type in there.

5 files changed, 59 insertions, 14 deletions

diff --git a/editor.c b/editor.c
index d7d92a1..bba0ab9 100644
--- a/editor.c
+++ b/editor.c
@@ -34,6 +34,7 @@ void init_editor(struct editor_state* editor)
 	editor->status_message_time = 0;
 	editor->syntax = NULL;
 	editor->mode = EDITOR_MODE_NORMAL;
+	editor->cmdline = textbuf_init();
 
 	editor_update_screen_size(editor);
 	window_set_filename("[New]");
@@ -58,6 +59,13 @@ char* editor_prompt(struct editor_state* editor, char* prompt, void (*callback)(
 	return NULL;
 }
 
+void editor_run_command(struct editor_state *editor)
+{
+	/* TODO: Do something here */
+	editor->mode = EDITOR_MODE_NORMAL;
+	textbuf_clear(&editor->cmdline);
+}
+
 void editor_try_quit(struct editor_state *editor)
 {
 	if (editor->dirty && quit_message_time == 0) {
@@ -308,6 +316,11 @@ void editor_draw_message_bar(struct editor_state* editor, struct textbuf *buffer
 		return;
 	}
 
+	if (editor->mode == EDITOR_MODE_COMMAND) {
+		textbuf_append(buffer, editor->cmdline.buffer, editor->cmdline.length);
+		return;
+	}
+
 	int message_length = strlen(editor->status_message);
 	
 	if (message_length > editor->screen_cols)
@@ -326,4 +339,5 @@ void editor_destroy(struct editor_state *editor)
 	for (int i = 0; i < editor->num_lines; i++)
 		free_line(&editor->lines[i]);
 	free(editor->lines);
+	textbuf_free(&editor->cmdline);
 }
diff --git a/editor.h b/editor.h
index 00695fe..52daa06 100644
--- a/editor.h
+++ b/editor.h
@@ -33,12 +33,14 @@ struct editor_state {
 	 * letter will be inserted when entering insert mode.
 	 */
 	int pressed_insert_key;
+	struct textbuf cmdline;
 };
 
 void init_editor(struct editor_state* editor);
 
 void editor_set_status_message(struct editor_state* editor, const char* format, ...);
 char* editor_prompt(struct editor_state* editor, char* prompt, void (*callback)(struct editor_state*, char*, int));
+void editor_run_command(struct editor_state *editor);
 void editor_try_quit(struct editor_state *editor);
 
 void editor_move_left(struct editor_state *);
diff --git a/input.c b/input.c
index 73889bd..36670e2 100644
--- a/input.c
+++ b/input.c
@@ -4,10 +4,25 @@
 #include "file.h"
 #include "line.h"
 
+void input_process_textinput(struct editor_state *editor, const char *text)
+{
+	/* Ignore the first letter after entering insert mode. */
+	if (editor->pressed_insert_key) {
+		editor->pressed_insert_key = 0;
+		return;
+	}
+
+	if (editor->mode == EDITOR_MODE_INSERT) {
+		editor_insert_char(editor, *text);
+	} else if (editor->mode == EDITOR_MODE_COMMAND) {
+		textbuf_append(&editor->cmdline, text, 1);
+	}
+}
+
 void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym)
 {
 	/* Handle keypresses for typing modes separately. */
-	if (editor->mode != EDITOR_MODE_NORMAL) {
+	if (editor->mode == EDITOR_MODE_INSERT) {
 		if (keysym->sym == SDLK_BACKSPACE)
 			editor_delete_char(editor);
 
@@ -22,6 +37,18 @@ void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym)
 		return;
 	}
 
+	if (editor->mode == EDITOR_MODE_COMMAND) {
+		if (keysym->sym == SDLK_BACKSPACE)
+			textbuf_delete(&editor->cmdline);
+
+		if (keysym->sym == SDLK_RETURN)
+			editor_run_command(editor);
+
+		if (keysym->sym == SDLK_ESCAPE)
+			editor->mode = EDITOR_MODE_NORMAL;
+		return;
+	}
+
 	switch (keysym->sym) {
 		/* TODO: Reimplement page up/down on Shift+W/S. */
 		case SDLK_w:
@@ -80,5 +107,8 @@ void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym)
 		case SDLK_SLASH:
 			editor_find(editor);
 			break;
+		case SDLK_SEMICOLON:
+			editor->mode = EDITOR_MODE_COMMAND;
+			break;
 	}
 }
diff --git a/input.h b/input.h
index 85dbdde..12b1bc4 100644
--- a/input.h
+++ b/input.h
@@ -4,6 +4,7 @@
 #include "editor.h"
 #include <SDL2/SDL_keyboard.h>
 
+void input_process_textinput(struct editor_state *editor, const char *text);
 void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym);
 
 #endif
diff --git a/window.c b/window.c
index 9518d69..cb041e5 100644
--- a/window.c
+++ b/window.c
@@ -52,17 +52,7 @@ int window_handle_event(struct editor_state *editor)
 		editor_process_keypress(editor, &e.key.keysym);
 		break;
 	case SDL_TEXTINPUT:
-		if (editor->mode == EDITOR_MODE_NORMAL)
-			break;
-		/*
-		 * Ignore the first letter after entering insert mode, because it
-		 * usually is just 'i'.
-		 */
-		if (editor->pressed_insert_key) {
-			editor->pressed_insert_key = 0;
-			break;
-		}
-		editor_insert_char(editor, *e.text.text);
+		input_process_textinput(editor, e.text.text);
 		break;
 	case SDL_WINDOWEVENT:
 		if (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
@@ -164,9 +154,17 @@ void window_redraw(struct editor_state *editor)
 	editor_scroll(editor);
 	draw_editor(editor);
 
+	int cursor_x = (editor->cursor_display_x - editor->col_offset);
+	int cursor_y = (editor->cursor_y - editor->line_offset);
+
+	if (editor->mode == EDITOR_MODE_COMMAND) {
+		cursor_x = editor->cmdline.length;
+		cursor_y = editor->screen_rows + 1;
+	}
+
 	SDL_Rect cursor_rect;
-	cursor_rect.x = (editor->cursor_display_x - editor->col_offset) * font.width;
-	cursor_rect.y = (editor->cursor_y - editor->line_offset) * font.height;
+	cursor_rect.x = cursor_x * font.width;
+	cursor_rect.y = cursor_y * font.height;
 	cursor_rect.w = font.width;
 	cursor_rect.h = font.height;