Read text to edit from stdin if it isn't a terminal

This allows usage as a filter without specifying "-" as file name.

1 files changed, 15 insertions, 10 deletions

diff --git a/vis.c b/vis.c
index 6c44b12..30cf126 100644
--- a/vis.c
+++ b/vis.c
@@ -1685,14 +1685,8 @@ int main(int argc, char *argv[]) {
 	for (int i = 1; i < argc; i++) {
 		if (argv[i][0] == '-') {
 			switch (argv[i][1]) {
-			case '\0':
-				if (!editor_window_new_fd(vis, STDIN_FILENO))
-					die("Can not read from stdin\n");
-				int fd = open("/dev/tty", O_RDONLY);
-				if (fd == -1)
-					die("Can not reopen stdin\n");
-				dup2(fd, STDIN_FILENO);
-				close(fd);
+			/* handle command line arguments */
+			default:
 				break;
 			}
 		} else if (!editor_window_new(vis, argv[i])) {
@@ -1700,8 +1694,19 @@ int main(int argc, char *argv[]) {
 		}
 	}
 
-	if (!vis->windows && !editor_window_new(vis, NULL))
-		die("Can not create empty buffer\n");
+	if (!vis->windows) {
+		if (!strcmp(argv[argc-1], "-") || !isatty(STDIN_FILENO)) {
+			if (!editor_window_new_fd(vis, STDIN_FILENO))
+				die("Can not read from stdin\n");
+			int fd = open("/dev/tty", O_RDONLY);
+			if (fd == -1)
+				die("Can not reopen stdin\n");
+			dup2(fd, STDIN_FILENO);
+			close(fd);
+		} else if (!editor_window_new(vis, NULL)) {
+			die("Can not create empty buffer\n");
+		}
+	}
 
 	mainloop();
 	editor_free(vis);