From 16b949aa3147e3aaadb6888f574f6424d4c2d8f3 Mon Sep 17 00:00:00 2001
From: cflip <cflip@cflip.net>
Date: Tue, 31 Jan 2023 12:30:50 -0700
Subject: Add a function to handle changing the editor mode

This way any extra stuff such as clearing the command line buffer or
setting the flag to ignore the extra first key can be automatically set.
---
 editor.c | 22 ++++++++++++++++++++--
 editor.h |  2 ++
 input.c  | 16 +++++++---------
 3 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/editor.c b/editor.c
index bba0ab9..c4e2a06 100644
--- a/editor.c
+++ b/editor.c
@@ -62,8 +62,7 @@ char* editor_prompt(struct editor_state* editor, char* prompt, void (*callback)(
 void editor_run_command(struct editor_state *editor)
 {
 	/* TODO: Do something here */
-	editor->mode = EDITOR_MODE_NORMAL;
-	textbuf_clear(&editor->cmdline);
+	editor_set_mode(editor, EDITOR_MODE_NORMAL);
 }
 
 void editor_try_quit(struct editor_state *editor)
@@ -183,6 +182,25 @@ void editor_add_line_below(struct editor_state* editor)
 	editor->cursor_x = 0;
 }
 
+void editor_set_mode(struct editor_state *editor, enum editor_mode mode)
+{
+	enum editor_mode last_mode = editor->mode;
+	if (mode == last_mode)
+		return;
+
+	/* Clear the command line if we are leaving command mode. */
+	if (last_mode == EDITOR_MODE_COMMAND) {
+		textbuf_clear(&editor->cmdline);
+	}
+
+	/* Ignore the extra first letter if we are entering a typing mode. */
+	if (mode != EDITOR_MODE_NORMAL) {
+		editor->pressed_insert_key = 1;
+	}
+
+	editor->mode = mode;
+}
+
 static void editor_find_callback(struct editor_state* editor, char* query, int key)
 {
 	static int last_match = -1;
diff --git a/editor.h b/editor.h
index 52daa06..0ae0fae 100644
--- a/editor.h
+++ b/editor.h
@@ -55,6 +55,8 @@ void editor_delete_char(struct editor_state* editor);
 void editor_add_line_above(struct editor_state* editor);
 void editor_add_line_below(struct editor_state* editor);
 
+void editor_set_mode(struct editor_state *editor, enum editor_mode mode);
+
 void editor_find(struct editor_state* editor);
 void editor_scroll(struct editor_state* editor);
 void editor_update_screen_size(struct editor_state *);
diff --git a/input.c b/input.c
index 36670e2..3167a91 100644
--- a/input.c
+++ b/input.c
@@ -33,7 +33,7 @@ void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym)
 			editor_insert_char(editor, '\t');
 
 		if (keysym->sym == SDLK_ESCAPE)
-			editor->mode = EDITOR_MODE_NORMAL;
+			editor_set_mode(editor, EDITOR_MODE_NORMAL);
 		return;
 	}
 
@@ -45,7 +45,7 @@ void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym)
 			editor_run_command(editor);
 
 		if (keysym->sym == SDLK_ESCAPE)
-			editor->mode = EDITOR_MODE_NORMAL;
+			editor_set_mode(editor, EDITOR_MODE_NORMAL);
 		return;
 	}
 
@@ -85,30 +85,28 @@ void editor_process_keypress(struct editor_state *editor, SDL_Keysym *keysym)
 			editor_delete_char(editor);
 			break;
 		case SDLK_i:
-			editor->mode = EDITOR_MODE_INSERT;
-			editor->pressed_insert_key = 1;
+			editor_set_mode(editor, EDITOR_MODE_INSERT);
 			break;
 		case SDLK_l:
 			if (keysym->mod & KMOD_SHIFT)
 				editor_move_end(editor);
 			else
 				editor_move_right(editor);
-			editor->mode = EDITOR_MODE_INSERT;
-			editor->pressed_insert_key = 1;
+			editor_set_mode(editor, EDITOR_MODE_INSERT);
 			break;
 		case SDLK_o:
 			if (keysym->mod & KMOD_SHIFT)
 				editor_add_line_above(editor);
 			else
 				editor_add_line_below(editor);
-			editor->mode = EDITOR_MODE_INSERT;
-			editor->pressed_insert_key = 1;
+			editor_set_mode(editor, EDITOR_MODE_INSERT);
 			break;
 		case SDLK_SLASH:
 			editor_find(editor);
 			break;
 		case SDLK_SEMICOLON:
-			editor->mode = EDITOR_MODE_COMMAND;
+			if (keysym->mod & KMOD_SHIFT)
+				editor_set_mode(editor, EDITOR_MODE_COMMAND);
 			break;
 	}
 }
-- 
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