commit 4cf6ba137fc2ca92f3066c390b89542d88735ef6
from: Omar Polo <op@omarpolo.com>
date: Fri Feb 11 18:12:17 2022 UTC

remote open: open an url into telescope from outside of it

if telescope is started with an url while there is already another
instance of it running and the -S flag is not provided, the link will be
automagically opened into the running instance of telescope.

Telescope now listens on a UNIX domain socket in ~/.telescope/ctl (or
~/.cache/telescope/ctl if XDG is used) for commands.

commit - 0f559c556ffae888dccd908739c09005bedbf6d0
commit + 4cf6ba137fc2ca92f3066c390b89542d88735ef6
blob - 265e705c9a2c4a1917bddc5d07f838847b635c6e
blob + d7293171fd6f3b450a3e0c8b472bf8acaa83e432
--- Makefile.am
+++ Makefile.am
@@ -7,6 +7,7 @@ EXTRA_telescope_SOURCES = compat/ohash.h compat/queue.
 telescope_SOURCES =	cmd.c			\
 			cmd.gen.c		\
 			compl.c			\
+			control.c		\
 			defaults.c		\
 			downloads.c		\
 			fs.c			\
@@ -16,6 +17,7 @@ telescope_SOURCES =	cmd.c			\
 			include/cmd.h		\
 			include/compat.h	\
 			include/compl.h		\
+			include/control.h	\
 			include/defaults.h	\
 			include/fs.h		\
 			include/keymap.h	\
blob - eb0e0e72278479b0d75de55646689c421aa9b1df
blob + f7631998b7a0f5abf1fc2d827c8610be026c3ff0
--- fs.c
+++ fs.c
@@ -75,6 +75,7 @@ char		config_path_base[PATH_MAX];
 char		data_path_base[PATH_MAX];
 char		cache_path_base[PATH_MAX];
 
+char		ctlsock_path[PATH_MAX];
 char		config_path[PATH_MAX];
 char		lockfile_path[PATH_MAX];
 char		bookmark_file[PATH_MAX];
@@ -673,6 +674,8 @@ fs_init(void)
 {
 	init_paths();
 
+	join_path(ctlsock_path, cache_path_base, "/ctl",
+	    sizeof(ctlsock_path));
 	join_path(config_path, config_path_base, "/config",
 	    sizeof(config_path));
 	join_path(lockfile_path, cache_path_base, "/lock",
blob - c1a0fce9a9af9b827c7f23a1ee95b36269b4cd3f
blob + 6337fed6e6cfa36597a25e71245cf9b17eec0d16
--- include/fs.h
+++ include/fs.h
@@ -25,6 +25,7 @@ extern char	config_path_base[PATH_MAX];
 extern char	data_path_base[PATH_MAX];
 extern char	cache_path_base[PATH_MAX];
 
+extern char	ctlsock_path[PATH_MAX];
 extern char	config_path[PATH_MAX];
 extern char	lockfile_path[PATH_MAX];
 extern char	bookmark_file[PATH_MAX];
blob - 23b5fe74d9e6ef4a90f187460e9620a548bc523d
blob + 66bad0bf2f576e29b0f3724503635a7823945e35
--- include/telescope.h
+++ include/telescope.h
@@ -75,6 +75,8 @@ enum imsg_type {
 	IMSG_SESSION_TAB,
 	IMSG_SESSION_TAB_HIST,
 	IMSG_SESSION_END,
+
+	IMSG_CTL_OPEN_URL,
 };
 
 enum line_type {
blob - 4ce510af9bce453b372b9f7fc77068b879b2b563
blob + 0f2c57ee4215b0e220bf6d9e0f1a1f0ae42ae4c6
--- sandbox.c
+++ sandbox.c
@@ -37,7 +37,7 @@ sandbox_net_process(void)
 void
 sandbox_ui_process(void)
 {
-	if (pledge("stdio tty recvfd", NULL) == -1)
+	if (pledge("stdio tty unix recvfd", NULL) == -1)
 		err(1, "pledge");
 }
 
blob - cce3b0a13dbdcac30ab92ff4f795cb0eedf830ca
blob + 61f4fec2fae4c283a874d775710363ada79f4885
--- telescope.c
+++ telescope.c
@@ -17,6 +17,7 @@
 #include "compat.h"
 
 #include <sys/socket.h>
+#include <sys/un.h>
 #include <sys/wait.h>
 
 #include <errno.h>
@@ -27,6 +28,7 @@
 #include <string.h>
 #include <unistd.h>
 
+#include "control.h"
 #include "defaults.h"
 #include "fs.h"
 #include "mcache.h"
@@ -136,6 +138,7 @@ static int		 make_request(struct tab *, struct get_req
 static int		 make_fs_request(struct tab *, int, const char *);
 static int		 do_load_url(struct tab *, const char *, const char *, int);
 static pid_t		 start_child(enum telescope_process, const char *, int);
+static void		 send_url(const char *);
 
 static struct proto {
 	const char	*schema;
@@ -1140,6 +1143,30 @@ start_child(enum telescope_process p, const char *argv
 	argv[argc++] = NULL;
 	execvp(argv0, (char *const *)argv);
 	err(1, "execvp(%s)", argv0);
+}
+
+static void
+send_url(const char *url)
+{
+	struct sockaddr_un	 sun;
+	struct imsgbuf		 ibuf;
+	int			 ctl_sock;
+
+	if ((ctl_sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+		err(1, "socket");
+
+	memset(&sun, 0, sizeof(sun));
+	sun.sun_family = AF_UNIX;
+	strlcpy(sun.sun_path, ctlsock_path, sizeof(sun.sun_path));
+
+	if (connect(ctl_sock, (struct sockaddr *)&sun, sizeof(sun)) == -1)
+		err(1, "connect: %s", ctlsock_path);
+
+	imsg_init(&ibuf, ctl_sock);
+	imsg_compose(&ibuf, IMSG_CTL_OPEN_URL, 0, 0, -1, url,
+	    strlen(url) + 1);
+	imsg_flush(&ibuf);
+	close(ctl_sock);
 }
 
 int
@@ -1171,6 +1198,7 @@ main(int argc, char * const *argv)
 {
 	struct imsgev	 net_ibuf, fs_ibuf;
 	pid_t		 pid;
+	int		 control_fd;
 	int		 pipe2net[2], pipe2fs[2];
 	int		 ch, configtest = 0, fail = 0;
 	int		 proc = -1;
@@ -1261,9 +1289,15 @@ main(int argc, char * const *argv)
 	    (download_path = strdup("/tmp/")) == NULL)
 		errx(1, "strdup");
 
-	if (!safe_mode && (sessionfd = lock_session()) == -1)
+	if (!safe_mode && (sessionfd = lock_session()) == -1) {
+		if (has_url) {
+			send_url(url);
+			exit(0);
+		}
+
 		errx(1, "can't lock session, is another instance of "
 		    "telescope already running?");
+	}
 
 	/* Start children. */
 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2fs) == -1)
@@ -1287,6 +1321,12 @@ main(int argc, char * const *argv)
 
 	event_init();
 
+	if (!safe_mode) {
+		if ((control_fd = control_init(ctlsock_path)) == -1)
+			err(1, "control_init %s", ctlsock_path);
+		control_listen(control_fd);
+	}
+
 	/* initialize the in-memory cache store */
 	mcache_init();