From 0193f647eff03696308377d0847967b51ed0db47 Mon Sep 17 00:00:00 2001
From: coast <coasteen@proton.me>
Date: Fri, 27 Feb 2026 10:02:25 +0330
Subject: auto reload

---
 src/daemon.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 76 insertions(+), 13 deletions(-)

(limited to 'src')

diff --git a/src/daemon.c b/src/daemon.c
index 293aeee..82154db 100644
--- a/src/daemon.c
+++ b/src/daemon.c
@@ -5,6 +5,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <pwd.h>
 #include <signal.h>
 #include <stdarg.h>
@@ -12,6 +13,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
+#include <sys/inotify.h>
 #include <sys/select.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
@@ -51,6 +53,8 @@ static int bind_count = 0;
 
 static volatile sig_atomic_t g_quit = 0;
 
+static char g_cfg[512];
+
 static void die(const char *fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
@@ -232,14 +236,13 @@ static int add_binding(char *msg) {
   strncpy(bindings[bind_count].cmd, cmd, MAX_CMD_LEN - 1);
   bindings[bind_count].cmd[MAX_CMD_LEN - 1] = '\0';
 
-  int grabbed = grab_key(mod, kc);
-  if (grabbed == -1)
+  if (grab_key(mod, kc) == -1)
     warn("stored binding but grab failed for '%s+%s'", combo, keyname);
 
   bind_count++;
   xcb_flush(conn);
   fprintf(stderr, "piss: bound '%s+%s' → %s\n", combo, keyname, cmd);
-  return grabbed;
+  return 0;
 }
 
 static void spawn(const char *cmd) {
@@ -358,6 +361,39 @@ static void ensure_executable(const char *path) {
   }
 }
 
+static void reload_config(int inotify_fd, int *watch_wd) {
+  fprintf(stderr, "piss: config changed, reloading\n");
+
+  ungrab_all();
+  bind_count = 0;
+
+  if (*watch_wd >= 0) {
+    inotify_rm_watch(inotify_fd, *watch_wd);
+    *watch_wd = -1;
+  }
+
+  ensure_executable(g_cfg);
+
+  *watch_wd =
+      inotify_add_watch(inotify_fd, g_cfg, IN_CLOSE_WRITE | IN_MOVED_TO);
+  if (*watch_wd < 0)
+    warn("inotify_add_watch(%s): %s", g_cfg, strerror(errno));
+
+  spawn("notify-send -i input-keyboard 'piss' 'Config reloaded'");
+
+  pid_t pid = fork();
+  if (pid < 0) {
+    warn("fork (reload): %s", strerror(errno));
+    return;
+  }
+  if (pid == 0) {
+    char *args[] = {g_cfg, NULL};
+    execvp(g_cfg, args);
+    fprintf(stderr, "piss: execvp(%s): %s\n", g_cfg, strerror(errno));
+    _exit(1);
+  }
+}
+
 int main(int argc, char *argv[]) {
 
   if (argc >= 2 && strcmp(argv[1], "wait") == 0)
@@ -450,14 +486,23 @@ int main(int argc, char *argv[]) {
     }
   }
 
-  char cfg[512];
   if (argc > 1) {
-    strncpy(cfg, argv[1], sizeof(cfg) - 1);
-    cfg[sizeof(cfg) - 1] = '\0';
+    strncpy(g_cfg, argv[1], sizeof(g_cfg) - 1);
+    g_cfg[sizeof(g_cfg) - 1] = '\0';
   } else {
-    get_default_config(cfg, sizeof(cfg));
+    get_default_config(g_cfg, sizeof(g_cfg));
   }
-  ensure_executable(cfg);
+  ensure_executable(g_cfg);
+
+  int inotify_fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
+  if (inotify_fd < 0)
+    die("inotify_init1: %s", strerror(errno));
+
+  int watch_wd =
+      inotify_add_watch(inotify_fd, g_cfg, IN_CLOSE_WRITE | IN_MOVED_TO);
+  if (watch_wd < 0)
+    warn("inotify_add_watch(%s): %s — live reload disabled", g_cfg,
+         strerror(errno));
 
   xcb_flush(conn);
 
@@ -466,9 +511,9 @@ int main(int argc, char *argv[]) {
     if (pid < 0)
       die("fork: %s", strerror(errno));
     if (pid == 0) {
-      char *args[] = {cfg, NULL};
-      execvp(cfg, args);
-      fprintf(stderr, "piss: execvp(%s): %s\n", cfg, strerror(errno));
+      char *args[] = {g_cfg, NULL};
+      execvp(g_cfg, args);
+      fprintf(stderr, "piss: execvp(%s): %s\n", g_cfg, strerror(errno));
       _exit(1);
     }
   }
@@ -483,7 +528,14 @@ int main(int argc, char *argv[]) {
     FD_ZERO(&rfds);
     FD_SET(xcb_fd, &rfds);
     FD_SET(serv, &rfds);
-    int maxfd = (xcb_fd > serv) ? xcb_fd : serv;
+    if (inotify_fd >= 0)
+      FD_SET(inotify_fd, &rfds);
+
+    int maxfd = xcb_fd;
+    if (serv > maxfd)
+      maxfd = serv;
+    if (inotify_fd > maxfd)
+      maxfd = inotify_fd;
 
     int r = select(maxfd + 1, &rfds, NULL, NULL, NULL);
     if (r < 0) {
@@ -493,6 +545,14 @@ int main(int argc, char *argv[]) {
       continue;
     }
 
+    if (inotify_fd >= 0 && FD_ISSET(inotify_fd, &rfds)) {
+      char ibuf[sizeof(struct inotify_event) + NAME_MAX + 1];
+      ssize_t nr;
+      while ((nr = read(inotify_fd, ibuf, sizeof(ibuf))) > 0)
+        (void)nr;
+      reload_config(inotify_fd, &watch_wd);
+    }
+
     if (FD_ISSET(serv, &rfds)) {
       int cli = accept(serv, NULL, NULL);
       if (cli < 0) {
@@ -508,7 +568,8 @@ int main(int argc, char *argv[]) {
           buf[nr] = '\0';
           int ok = add_binding(buf);
           const char *ack = (ok == 0) ? "ok\n" : "err\n";
-          (void)write(cli, ack, strlen(ack));
+          if (write(cli, ack, strlen(ack)) < 0)
+            warn("write(client): %s", strerror(errno));
         } else if (nr < 0) {
           warn("read(client): %s", strerror(errno));
         }
@@ -567,6 +628,8 @@ int main(int argc, char *argv[]) {
   xcb_disconnect(conn);
   unlink(SOCK_PATH);
   close(serv);
+  if (inotify_fd >= 0)
+    close(inotify_fd);
 
   return 0;
 }
-- 
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