Prompt at bar

include/vip.h

@@ -62,6 +62,7 @@ void abAppend(struct abuf *ab, const char *s, int len);
 void append_row(char *s, size_t len);
 void row_insert_char(row *row, int at, int c);
 void row_del_char(row *row, int at);
+char *prompt_editor(char *prompt);
 
 extern editor vip;
 

src/vip.c

@@ -117,7 +117,13 @@ void open_editor(char *filename)
 
 void save_file()
 {
-	if (vip.filename == NULL) return;
+	if (vip.filename == NULL) {
+		vip.filename = prompt_editor("Save as: %s (ESC to cancel)");
+		if (vip.filename == NULL) {
+			set_status_bar_message("Save aborted");
+			return;
+		}
+	}
 	int len;
 	char *buf = rows_to_str(&len);
 	int fd = open(vip.filename, O_RDWR | O_CREAT, 0644);
@@ -228,6 +234,40 @@ void refresh_screen()
 	abFree(&ab);
 }
 
+char *prompt_editor(char *prompt)
+{
+	size_t bufsize = 128;
+	char *buf = malloc(bufsize);
+	size_t buflen = 0;
+	buf[0] = '\0';
+	while (1) {
+		set_status_bar_message(prompt, buf);
+		refresh_screen();
+		int c = read_key();
+		if (c == DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE) {
+			if (buflen != 0) {
+				buf[--buflen] = '\0';
+			}
+		} else if (c == '\x1b') {
+			set_status_bar_message("");
+			free(buf);
+			return NULL;
+		} else if (c == '\r') {
+			if (buflen != 0) {
+				set_status_bar_message("");
+				return buf;
+			}
+		} else if (!iscntrl(c) && c < 128) {
+			if (buflen == bufsize - 1) {
+				bufsize *= 2;
+				buf = realloc(buf, bufsize);
+			}
+			buf[buflen++] = c;
+			buf[buflen] = '\0';
+		}
+	}
+}
+
 void move_cursor(int key)
 {
 	row *row = (vip.cy >= vip.rows) ? NULL : &vip.row[vip.cy];