Allow sway IPC clients to fall back to i3 socket

1 files changed, 25 insertions, 7 deletions

diff --git a/common/ipc-client.c b/common/ipc-client.c
index 582c5e86..117e9910 100644
--- a/common/ipc-client.c
+++ b/common/ipc-client.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 2
+#define _POSIX_C_SOURCE 200809L
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -14,13 +14,31 @@ static const char ipc_magic[] = {'i', '3', '-', 'i', 'p', 'c'};
 static const size_t ipc_header_size = sizeof(ipc_magic)+8;
 
 char *get_socketpath(void) {
-        FILE *fp = popen("sway --get-socketpath", "r");
-        if (!fp) {
-                return NULL;
+        const char *swaysock = getenv("SWAYSOCK");
+        if (swaysock) {
+                return strdup(swaysock);
         }
-        char *line = read_line(fp);
-        pclose(fp);
-        return line;
+        FILE *fp = popen("sway --get-socketpath 2>/dev/null", "r");
+        if (fp) {
+                char *line = read_line(fp);
+                pclose(fp);
+                if (line && *line) {
+                        return line;
+                }
+        }
+        const char *i3sock = getenv("I3SOCK");
+        if (i3sock) {
+                return strdup(i3sock);
+        }
+        fp = popen("i3 --get-socketpath 2>/dev/null", "r");
+        if (fp) {
+                char *line = read_line(fp);
+                pclose(fp);
+                if (line && *line) {
+                        return line;
+                }
+        }
+        return NULL;
 }
 
 int ipc_open_socket(const char *socket_path) {