feat: add normal alias for discrete scheduler (#1724)

examples/common/common.cpp

@@ -1475,7 +1475,7 @@ ArgOptions SDGenerationParams::get_options() {
          on_high_noise_sample_method_arg},
         {"",
          "--scheduler",
-         "denoiser sigma scheduler, one of [discrete, karras, exponential, ays, gits, smoothstep, sgm_uniform, simple, kl_optimal, lcm, bong_tangent, ltx2, logit_normal, flux2, flux], default: model-specific",
+         "denoiser sigma scheduler, one of [discrete, karras, exponential, ays, gits, smoothstep, sgm_uniform, simple, kl_optimal, lcm, bong_tangent, ltx2, logit_normal, flux2, flux], alias: normal=discrete, default: model-specific",
          on_scheduler_arg},
         {"",
          "--sigmas",

examples/server/routes_sdapi.cpp

@@ -438,6 +438,9 @@ void register_sdapi_endpoints(httplib::Server& svr, ServerRuntime& rt) {
         scheduler_names.push_back("default");
         for (int i = 0; i < SCHEDULER_COUNT; i++) {
             scheduler_names.push_back(sd_scheduler_name((scheduler_t)i));
+            if (i == DISCRETE_SCHEDULER) {
+                scheduler_names.push_back("normal");
+            }
         }
         json r = json::array();
         for (auto name : scheduler_names) {

examples/server/routes_sdcpp.cpp

@@ -219,6 +219,9 @@ static json make_capabilities_json(ServerRuntime& runtime) {
 
     for (int i = 0; i < SCHEDULER_COUNT; ++i) {
         schedulers.push_back(sd_scheduler_name((scheduler_t)i));
+        if (i == DISCRETE_SCHEDULER) {
+            schedulers.push_back("normal");
+        }
     }
 
     {

src/stable-diffusion.cpp

@@ -2572,6 +2572,9 @@ const char* sd_scheduler_name(enum scheduler_t scheduler) {
 }
 
 enum scheduler_t str_to_scheduler(const char* str) {
+    if (!strcmp(str, "normal")) {
+        return DISCRETE_SCHEDULER;
+    }
     for (int i = 0; i < SCHEDULER_COUNT; i++) {
         if (!strcmp(str, scheduler_to_str[i])) {
             return (enum scheduler_t)i;