Initial support for passing strings to GMT via GMT_Put_Vectors

Author: seisman

pygmt/clib/session.py

@@ -59,6 +59,7 @@
     np.uint64: "GMT_ULONG",
     np.uint32: "GMT_UINT",
     np.datetime64: "GMT_DATETIME",
+    np.str_: "GMT_TEXT",
 }
 
 
@@ -781,6 +782,9 @@ def put_vector(self, dataset, column, vector):
             vector_pointer[:] = np.char.encode(
                 np.datetime_as_string(array_to_datetime(vector))
             )
+        elif gmt_type == self["GMT_TEXT"]:
+            vector_pointer = (ctp.c_char_p * len(vector))()
+            vector_pointer[:] = np.char.encode(vector)
         else:
             vector_pointer = vector.ctypes.data_as(ctp.c_void_p)
         status = c_put_vector(