treat all Command arguments as strings when substituting

Author: Vladimir Kotal

opengrok-tools/src/main/python/opengrok_tools/utils/command.py

@@ -333,6 +333,7 @@ def fill_arg(self, args_append=None, args_subst=None):
         newcmd = []
         subst_done = -1
         for i, cmdarg in enumerate(self.cmd):
+            cmdarg = str(cmdarg)
             if args_subst:
                 for pattern in args_subst.keys():
                     if pattern in cmdarg:

opengrok-tools/src/test/python/test_command.py

@@ -34,10 +34,10 @@
 
 
 def test_subst_append_default():
-    cmd = Command(['foo', '=ARG=', 'bar'],
+    cmd = Command(['foo', '=ARG=', 33, 'bar'],
                   args_subst={"ARG": "blah"},
                   args_append=["1", "2"])
-    assert cmd.cmd == ['foo', '=blah=', 'bar', '1', '2']
+    assert cmd.cmd == ['foo', '=blah=', 33, 'bar', '1', '2']
 
 
 def test_subst_append_exclsubst():