debugcmdserver: use absolute_import and print_function

check-config: use absolute_import and print_function

casesmash: use absolute_import

chgserver: implement validate command validate will load the repo config and check if the server has up-to-date config to continue serve the client. In case it does not, the server will send instructions to the client about what to do next, including to retry with a different address or to unlink an outdated socket file to stop an old server.

templater: handle exception when applying map operator to non-iterable object Before this, "{noniterable % template}" raised an exception. This tries to provide a better indication for the common case, where a left-hand-side expression is a keyword.

templater: factor out thin helper that evaluates argument as string This function is trivial, but it can make it clear that args[i] is a (func, data) pair.

color: make label() template function stringify "expr" argument first Since label() should return a string (or a thunk to be evaluated to a string), this change is okay. This helps porting to evalstring() helper. See the next patch for details.

templater: fix shortest() to evaluate int argument and handle error

templater: fix pad() to evaluate int argument and handle error

templater: drop redundant type conversion when evaluating integer argument A function argument may be an integer. In this case, it isn't necessary to convert a value to string and back to integer. Because an argument may be an arbitrary object (e.g. date tuple), TypeError should be caught as well.