grass.pygrass: Support shortened parameter values

python/grass/pygrass/modules/interface/parameter.py

@@ -13,7 +13,6 @@ def _check_value(param, value):
     """Function to check the correctness of a value and
     return the checked value and the original.
     """
-    must_val = "The Parameter <%s>, must be one of the following values: %r"
     req = "The Parameter <%s>, require: %s, get: %s instead: %r\n%s"
     string = (type(b""), type(""))
 
@@ -107,7 +106,17 @@ def check_string(value):
                 raise ValueError(err_str)
         # check if value is in the list of valid values
         if param.values is not None and newvalue not in param.values:
-            raise ValueError(must_val % (param.name, param.values))
+            good = False
+            if param.type == str:
+                for param_value in param.values:
+                    if param_value.startswith(newvalue):
+                        good = True
+                        break
+            if not good:
+                raise ValueError(
+                    f"The Parameter <{param.name}>, must be one of the following values:"
+                    f" {param.values!r} not '{newvalue}'"
+                )
     return (
         (
             [
@@ -134,7 +143,7 @@ class Parameter(object):
         >>> param.value = 3
         Traceback (most recent call last):
            ...
-        ValueError: The Parameter <int_number>, must be one of the following values: [2, 4, 6, 8]
+        ValueError: The Parameter <int_number>, must be one of the following values: [2, 4, 6, 8] not '3'
 
     ...
     """

vector/v.to.rast/testsuite/test_v_to_rast.py

@@ -0,0 +1,58 @@
+"""
+Name:       v.to.rast test
+
+Purpose:    Test v.to.rast
+
+Author:     Vaclav Petras
+
+Copyright:  (C) 2023 by Vaclav Petras and the GRASS Development Team
+
+Licence:    This program is free software under the GNU General Public
+            License (>=v2). Read the file COPYING that comes with GRASS
+            for details.
+"""
+from grass.gunittest.case import TestCase
+from grass.gunittest.main import test
+
+
+class TestParameters(TestCase):
+    """Test v.to.rast"""
+
+    output = "roads"
+
+    @classmethod
+    def setUpClass(cls):
+        """Specify region for raster creation for this class"""
+        cls.use_temp_region()
+        cls.runModule("g.region", raster="roadsmajor", res=10, flags="a")
+
+    @classmethod
+    def tearDownClass(cls):
+        """Remove temporary region"""
+        cls.del_temp_region()
+
+    def tearDown(self):
+        """Remove maps after each test method"""
+        self.runModule(
+            "g.remove",
+            flags="f",
+            type="raster",
+            name=[self.output],
+        )
+
+    def test_legacy_use_interface(self):
+        """Check that a legacy value for use parameter works"""
+        self.assertModule(
+            "v.to.rast", input="roadsmajor", output=self.output, use="val", value=1
+        )
+
+    def test_use_interface(self):
+        """Check that use=value value=1 works"""
+        self.assertModule(
+            "v.to.rast", input="roadsmajor", output=self.output, use="value", value=1
+        )
+        self.assertRasterFitsInfo(raster=self.output, reference={"min": 1, "max": 1})
+
+
+if __name__ == "__main__":
+    test()