feat(dwm): add dynamic plugin system with xdrawer, dialer, and calllog plugins

src/dwm-plugins/dwm_plugin_runner.c

@@ -0,0 +1,116 @@
+#include <dirent.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <unistd.h>
+
+#include "../sxmo-dwm/dwm_plugin.h"
+
+static const char *const kPluginDirs[] = {
+  "/home/user/.local/lib/dwm/plugins",
+  "/usr/lib/dwm/plugins",
+  NULL
+};
+
+static const char *resolve_plugin_name_from_argv0(const char *argv0) {
+  const char *base = strrchr(argv0, '/');
+  base = base ? (base + 1) : argv0;
+  if (strcasecmp(base, "xdrawer") == 0) {
+    return "xdrawer";
+  }
+  if (strcasecmp(base, "xdialer") == 0 || strcasecmp(base, "dialer") == 0) {
+    return "dialer";
+  }
+  if (strcasecmp(base, "xcalllog") == 0 || strcasecmp(base, "calllog") == 0) {
+    return "calllog";
+  }
+  return NULL;
+}
+
+static int list_plugins(void) {
+  for (int i = 0; kPluginDirs[i]; ++i) {
+    DIR *dir = opendir(kPluginDirs[i]);
+    if (!dir) {
+      continue;
+    }
+    struct dirent *ent;
+    while ((ent = readdir(dir)) != NULL) {
+      size_t len = strlen(ent->d_name);
+      if (len <= 3 || strcmp(ent->d_name + len - 3, ".so") != 0) {
+        continue;
+      }
+      char path[512];
+      snprintf(path, sizeof(path), "%s/%s", kPluginDirs[i], ent->d_name);
+      void *h = dlopen(path, RTLD_NOW | RTLD_LOCAL);
+      if (!h) {
+        continue;
+      }
+      const DwmPlugin *plug = (const DwmPlugin *)dlsym(h, DWM_PLUGIN_ENTRY_SYMBOL);
+      if (plug && plug->api_version == DWM_PLUGIN_API_VERSION && plug->name) {
+        printf("%-12s %s (%s)\n",
+               plug->name,
+               plug->description ? plug->description : "",
+               path);
+      }
+      dlclose(h);
+    }
+    closedir(dir);
+  }
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  const char *plugin_name = resolve_plugin_name_from_argv0(argv[0]);
+  int sub_argc = argc;
+  char **sub_argv = argv;
+
+  if (!plugin_name) {
+    if (argc < 2 || strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) {
+      fprintf(stderr, "Usage: %s <plugin-name|--list> [args...]\n", argv[0]);
+      return 1;
+    }
+    if (strcmp(argv[1], "--list") == 0 || strcmp(argv[1], "-l") == 0) {
+      return list_plugins();
+    }
+    plugin_name = argv[1];
+    sub_argc = argc - 1;
+    sub_argv = argv + 1;
+  }
+
+  const char *env_dir = getenv("DWM_PLUGIN_PATH");
+  char path[512];
+  void *handle = NULL;
+
+  if (env_dir && env_dir[0]) {
+    snprintf(path, sizeof(path), "%s/%s.so", env_dir, plugin_name);
+    if (access(path, R_OK) == 0) {
+      handle = dlopen(path, RTLD_NOW | RTLD_LOCAL);
+    }
+  }
+
+  for (int i = 0; !handle && kPluginDirs[i]; ++i) {
+    snprintf(path, sizeof(path), "%s/%s.so", kPluginDirs[i], plugin_name);
+    if (access(path, R_OK) == 0) {
+      handle = dlopen(path, RTLD_NOW | RTLD_LOCAL);
+    }
+  }
+
+  if (!handle) {
+    fprintf(stderr, "dwm-plugin: failed to load plugin '%s': %s\n",
+            plugin_name, dlerror());
+    return 1;
+  }
+
+  const DwmPlugin *plug = (const DwmPlugin *)dlsym(handle, DWM_PLUGIN_ENTRY_SYMBOL);
+  if (!plug || plug->api_version != DWM_PLUGIN_API_VERSION || !plug->run_main) {
+    fprintf(stderr, "dwm-plugin: invalid plugin '%s'\n", plugin_name);
+    dlclose(handle);
+    return 1;
+  }
+
+  int rc = plug->run_main(sub_argc, sub_argv);
+  dlclose(handle);
+  return rc;
+}