fix(input): constrain diag_subspace availability (deepmodeling#7835)

Co-authored-by: Stardust0831 <169599847+Stardust0831@users.noreply.github.com>

Author: Stardust0831

docs/advanced/input_files/input-main.md

@@ -1006,6 +1006,7 @@
 ### diag_subspace
 
 - **Type**: Integer
+- **Availability**: *[`basis_type`](#basis_type)==pw and [`ks_solver`](#ks_solver)==dav_subspace*
 - **Description**: The method to diagonalize subspace in dav_subspace method.
   - 0: by LAPACK
   - 1: by GenELPA

docs/parameters.yaml

@@ -428,7 +428,7 @@ parameters:
       * 2: by ScaLAPACK
     default_value: "0"
     unit: ""
-    availability: ""
+    availability: basis_type==pw and ks_solver==dav_subspace
   - name: erf_ecut
     category: Plane wave related variables
     type: Real

source/source_io/module_parameter/read_inp_sys.cpp

@@ -1178,6 +1178,7 @@ Available options are:
 * 1: by GenELPA
 * 2: by ScaLAPACK)";
         item.default_value = "0";
+        item.set_availability("basis_type==pw and ks_solver==dav_subspace");
         read_sync_int(input.diag_subspace);
         this->add_item(item);
     }

source/source_io/test_serial/read_input_item_test.cpp

@@ -1990,6 +1990,10 @@ TEST_F(InputTest, Item_test2)
         output = testing::internal::GetCapturedStdout();
         EXPECT_THAT(output, testing::HasSubstr("NOTICE"));
     }
+    { // diag_subspace
+        auto it = find_label("diag_subspace", readinput.input_lists);
+        EXPECT_EQ(it->second.get_availability(), "basis_type==pw and ks_solver==dav_subspace");
+    }
     { // md_nstep
         auto it = find_label("md_nstep", readinput.input_lists);
         param.input.mdp.md_nstep = 0;