1 files changed, 78 insertions, 0 deletions
diff --git a/bin/nudge.c b/bin/nudge.c
new file mode 100644
index 00000000..108d2459
--- /dev/null
+++ b/bin/nudge.c
@@ -0,0 +1,78 @@
+/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <termios.h>
+#include <unistd.h>
+
+static int shake = 10;
+static int delay = 20000;
+static int count = 2;
+
+static void move(int tty, int x, int y) {
+	dprintf(tty, "\33[3;%d;%dt", x, y);
+	usleep(delay);
+}
+
+int main(int argc, char *argv[]) {
+	const char *path = "/dev/tty";
+	for (int opt; 0 < (opt = getopt(argc, argv, "f:n:s:t:"));) {
+		switch (opt) {
+			break; case 'f': path = optarg;
+			break; case 'n': count = atoi(optarg);
+			break; case 's': shake = atoi(optarg);
+			break; case 't': delay = atoi(optarg) * 1000;
+			break; default:  return EX_USAGE;
+		}
+	}
+
+	int tty = open(path, O_RDWR);
+	if (tty < 0) err(EX_OSFILE, "%s", path);
+
+	struct termios save;
+	int error = tcgetattr(tty, &save);
+	if (error) err(EX_IOERR, "tcgetattr");
+
+	struct termios raw = save;
+	cfmakeraw(&raw);
+	error = tcsetattr(tty, TCSAFLUSH, &raw);
+	if (error) err(EX_IOERR, "tcsetattr");
+
+	char buf[256];
+	dprintf(tty, "\33[13t");
+	ssize_t len = read(tty, buf, sizeof(buf) - 1);
+	buf[(len < 0 ? 0 : len)] = '\0';
+
+	int x, y;
+	int n = sscanf(buf, "\33[3;%d;%dt", &x, &y);
+
+	error = tcsetattr(tty, TCSANOW, &save);
+	if (error) err(EX_IOERR, "tcsetattr");
+	if (n < 2) return EX_CONFIG;
+
+	dprintf(tty, "\33[5t");
+	for (int i = 0; i < count; ++i) {
+		move(tty, x - shake, y);
+		move(tty, x, y + shake);
+		move(tty, x + shake, y);
+		move(tty, x, y - shake);
+		move(tty, x, y);
+	}
+}