Implement vim keystrokes, vim modes and bar's lines

include/editor.h

@@ -3,6 +3,7 @@
 
 void insert_char(int c);
 void insert_new_line();
+void shift_new_line();
 void del_char();
 
 #endif

include/vip.h

@@ -10,17 +10,18 @@
 #define VERSION "0.0.1"
 
 /* number of times of warning before quitting when there is modified text */
-#define QUIT_CONFIRM 2
+#define QUIT_CONFIRM 1
 
 /* THEME */
 /* 38 and 48 is reversed as bar's color is reversed */
 #define SURFACE_1_BG "\x1b[38;2;49;50;68m"
-#define BLACK_BG "\x1b[38;2;0;0;0m"
 #define BLACK_FG "\x1b[48;2;0;0;0m"
+#define BLACK_BG "\x1b[38;2;0;0;0m"
 #define WHITE_FG "\x1b[48;2;205;214;244m"
 #define BLUE_FG "\x1b[48;2;137;180;250m"
 #define BLUE_BG "\x1b[38;2;137;180;250m"
 #define GREEN_FG "\x1b[48;2;166;227;161m"
+#define GREEN_BG "\x1b[38;2;166;227;161m"
 
 
 #define NORMAL 0

src/bar.c

@@ -11,11 +11,20 @@ void draw_status_bar(struct abuf *ab)
 {
 	abAppend(ab, "\x1b[7m", 4);
 	abAppend(ab, "\x1b[1m", 4);
-	abAppend(ab, BLUE_BG, 19);
 
+	int mode_len;
+	if (vip.mode == NORMAL) {
+		abAppend(ab, BLUE_BG, 19);
 		char mode[9] = " NORMAL ";
-	int mode_len = 8;
 		abAppend(ab, mode, 8);
+		mode_len = 8;
+	} else {
+		abAppend(ab, GREEN_BG, 19);
+		char mode[9] = " INSERT ";
+		abAppend(ab, mode, 8);
+		mode_len = 8;
+	}
+
 	abAppend(ab, "\x1b[22m", 5);
 
 	char git_branch[80], git_diff[80], file[80], lines[80], coord[80];
@@ -23,11 +32,20 @@ void draw_status_bar(struct abuf *ab)
 	int gitd_len = snprintf(git_diff, sizeof(git_diff), " %s ", "+1");
 	int file_len = snprintf(file, sizeof(file), " %.20s %s",
 			vip.filename ? vip.filename : "[No Name]", vip.dirty ? "[+]" : "");
-	int lines_len = snprintf(lines, sizeof(lines), " %dL ", vip.rows);
+	int lines_len;
+	if (vip.rows == 0 || vip.rows == vip.cy + 1) {
+		lines_len = snprintf(lines, sizeof(lines), " %s ", vip.rows == 0 ? "Top" : "Bot");
+	} else {
+		lines_len = snprintf(lines, sizeof(lines), " %d%% ", ((vip.cy + 1) * 100 / vip.rows));
+	}
 	int coord_len = snprintf(coord, sizeof(coord), " %d:%d ", vip.cy + 1, vip.rx + 1);
 
 	abAppend(ab, SURFACE_1_BG, 16); /* background */
+	if (vip.mode == NORMAL) {
 		abAppend(ab, BLUE_FG, 19); /* text */
+	} else {
+		abAppend(ab, GREEN_FG, 19);
+	}
 	abAppend(ab, git_branch, gitb_len);
 	abAppend(ab, "|", 1);
 	abAppend(ab, GREEN_FG, 19);
@@ -40,9 +58,17 @@ void draw_status_bar(struct abuf *ab)
 	while (file_len < vip.screencols) {
 		if (vip.screencols - mode_len - file_len - gitb_len - gitd_len - 1 == lines_len + coord_len) {
 			abAppend(ab, SURFACE_1_BG, 16);
+			if (vip.mode == NORMAL) {
 				abAppend(ab, BLUE_FG, 19);
+			} else {
+				abAppend(ab, GREEN_FG, 19);
+			}
 			abAppend(ab, lines, lines_len);
+			if (vip.mode == NORMAL) {
 				abAppend(ab, BLUE_BG, 19);
+			} else {
+				abAppend(ab, GREEN_BG, 19);
+			}
 			abAppend(ab, BLACK_FG, 13);
 			abAppend(ab, "\x1b[1m", 4);
 			abAppend(ab, coord, coord_len);

src/editor.c

@@ -28,6 +28,16 @@ void insert_new_line()
 	vip.cx = 0;
 }
 
+/*
+ * 'o' in vim
+ */
+void shift_new_line()
+{
+	insert_row(vip.cy + 1, "", 0);
+	vip.cy++;
+	vip.cx = 0;
+}
+
 void del_char()
 {
 	if (vip.cy == vip.rows) return;

src/vip.c

@@ -41,10 +41,6 @@ int read_key()
 			die("read");
 		}
 	}
-	if (c == 'k') return ARROW_UP;
-	if (c == 'j') return ARROW_DOWN;
-	if (c == 'l') return ARROW_RIGHT;
-	if (c == 'h') return ARROW_LEFT;
 
 	if (c == '\x1b') {
 		char seq[3];
@@ -302,7 +298,6 @@ void move_cursor(int key)
 
 void process_key()
 {
-	static int quit_times = QUIT_CONFIRM;
 
 	int c = read_key();
 	switch (c) {
@@ -310,21 +305,6 @@ void process_key()
 			insert_new_line();
 			break;
 
-		case CTRL_KEY('q'):
-			if (vip.dirty && quit_times > 0) {
-				set_status_bar_message("No write since last change for buffer \"%s\"", vip.filename);
-				quit_times--;
-				return;
-			}
-			write(STDOUT_FILENO, "\x1b[2J", 4);
-			write(STDOUT_FILENO, "\x1b[H", 3);
-			exit(0);
-			break;
-
-		case CTRL_KEY('s'):
-			save_file();
-			break;
-
 		case HOME_KEY:
 			vip.cx = 0;
 			break;
@@ -337,10 +317,12 @@ void process_key()
 
 		case BACKSPACE:
 		case CTRL_KEY('h'):
-		case DEL_KEY:
+		case DEL_KEY: /* PASSTHROUGH */
+			if (vip.mode == INSERT) {
 				if (c == DEL_KEY)
 					move_cursor(ARROW_RIGHT);
 				del_char();
+			}
 			break;
 
 		case PAGE_UP:
@@ -362,18 +344,88 @@ void process_key()
 		case ARROW_DOWN:
 		case ARROW_LEFT:
 		case ARROW_RIGHT:
+			if (vip.mode == INSERT) {
 				move_cursor(c);
+			}
 			break;
 
 		case CTRL_KEY('l'):
 		case '\x1b':
+			if (vip.mode == INSERT) {
+				vip.mode = NORMAL;
+				move_cursor(ARROW_LEFT);
+			}
 			break;
 
-		default:
+		case 'i':
-			insert_char(c);
+			if (vip.mode == NORMAL) {
+				vip.mode = INSERT;
+			}
+			break;
+
+		case ':': /* PASSTHROUGH */
+			if (vip.mode == NORMAL) {
+				char *cmd = prompt_editor(":%s");
+				switch (cmd[0]) {
+					case 'q':
+						if (cmd[1] == '!') {
+							write(STDOUT_FILENO, "\x1b[2J", 4);
+							write(STDOUT_FILENO, "\x1b[H", 3);
+							exit(0);
+							break;
+						} else {
+							if (vip.dirty) {
+								set_status_bar_message("No write since last change for buffer \"%s\"", vip.filename);
+								return;
+							}
+							write(STDOUT_FILENO, "\x1b[2J", 4);
+							write(STDOUT_FILENO, "\x1b[H", 3);
+							exit(0);
+							break;
+
+						}
+					case 'w':
+						save_file();
+				}
+			}
+
+		case 'k': /* PASSTHROUGH */
+			if (vip.mode != INSERT) {
+				move_cursor(ARROW_UP);
+				break;
+			}
+
+		case 'j': /* PASSTHROUGH */
+			if (vip.mode != INSERT) {
+				move_cursor(ARROW_DOWN);
+				break;
+			}
+
+		case 'l': /* PASSTHROUGH */
+			if (vip.mode != INSERT) {
+				move_cursor(ARROW_RIGHT);
+				break;
+			}
+
+		case 'h': /* PASSTHROUGH */
+			if (vip.mode != INSERT) {
+				move_cursor(ARROW_LEFT);
+				break;
+			}
+
+		case 'o': /* PASSTHROUGH */
+			if (vip.mode == NORMAL) {
+				shift_new_line();
+				vip.mode = INSERT;
+				break;
+			}
+
+		default:
+			if (vip.mode == INSERT) {
+				insert_char(c);
+			}
 			break;
 	}
-	quit_times = QUIT_CONFIRM;
 }
 
 void init_editor()
@@ -405,7 +457,7 @@ int main(int argc, char **argv)
 		open_editor(argv[1]);
 	}
 
-	set_status_bar_message("Ctrl-S: Save, Ctrl-Q:Quit");
+	set_status_bar_message(":w - Save, :q - Quit");
 
 	while (1) {
 		refresh_screen();