Add server side ncurses terminal

This adds a chat console the server owner can use for administration
or to talk with players.
It runs in its own thread, which makes the user interface immune to
the server's lag, behaving just like a client, except timeout.
As it uses the same console code as the f10 console, things like nick
completion or a scroll buffer basically come for free.
The terminal itself is written in a general way so that adding a
client version later on is just about implementing an interface.

Fatal errors are printed after the console exists and the ncurses
terminal buffer gets cleaned up with endwin(), so that the error still
remains visible.

The server owner can chose their username their entered text will
have in chat and where players can send PMs to.
Once the username is secured with a password to prevent anybody to
take over the server, the owner can execute admin tasks over the
console.

This change includes a contribution by @kahrl who has improved ncurses
library detection.

1 files changed, 189 insertions, 0 deletions

diff --git a/cmake/Modules/FindNcursesw.cmake b/cmake/Modules/FindNcursesw.cmake
new file mode 100644
index 000000000..dcb7cdda8
--- /dev/null
+++ b/cmake/Modules/FindNcursesw.cmake
@@ -0,0 +1,189 @@
+#.rst:
+# FindNcursesw
+# ------------
+#
+# Find the ncursesw (wide ncurses) include file and library.
+#
+# Based on FindCurses.cmake which comes with CMake.
+#
+# Checks for ncursesw first. If not found, it then executes the
+# regular old FindCurses.cmake to look for for ncurses (or curses).
+#
+#
+# Result Variables
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following variables:
+#
+# ``CURSES_FOUND``
+#   True if curses is found.
+# ``NCURSESW_FOUND``
+#   True if ncursesw is found.
+# ``CURSES_INCLUDE_DIRS``
+#   The include directories needed to use Curses.
+# ``CURSES_LIBRARIES``
+#   The libraries needed to use Curses.
+# ``CURSES_HAVE_CURSES_H``
+#   True if curses.h is available.
+# ``CURSES_HAVE_NCURSES_H``
+#   True if ncurses.h is available.
+# ``CURSES_HAVE_NCURSES_NCURSES_H``
+#   True if ``ncurses/ncurses.h`` is available.
+# ``CURSES_HAVE_NCURSES_CURSES_H``
+#   True if ``ncurses/curses.h`` is available.
+# ``CURSES_HAVE_NCURSESW_NCURSES_H``
+#   True if ``ncursesw/ncurses.h`` is available.
+# ``CURSES_HAVE_NCURSESW_CURSES_H``
+#   True if ``ncursesw/curses.h`` is available.
+#
+# Set ``CURSES_NEED_NCURSES`` to ``TRUE`` before the
+# ``find_package(Ncursesw)`` call if NCurses functionality is required.
+#
+#=============================================================================
+# Copyright 2001-2014 Kitware, Inc.
+# modifications: Copyright 2015 kahrl <kahrl@gmx.net>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+#
+# * Neither the names of Kitware, Inc., the Insight Software Consortium,
+#   nor the names of their contributors may be used to endorse or promote
+#   products derived from this software without specific prior written
+#   permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# ------------------------------------------------------------------------------
+#
+# The above copyright and license notice applies to distributions of
+# CMake in source and binary form.  Some source files contain additional
+# notices of original copyright by their contributors; see each source
+# for details.  Third-party software packages supplied with CMake under
+# compatible licenses provide their own copyright notices documented in
+# corresponding subdirectories.
+#
+# ------------------------------------------------------------------------------
+#
+# CMake was initially developed by Kitware with the following sponsorship:
+#
+#  * National Library of Medicine at the National Institutes of Health
+#    as part of the Insight Segmentation and Registration Toolkit (ITK).
+#
+#  * US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
+#    Visualization Initiative.
+#
+#  * National Alliance for Medical Image Computing (NAMIC) is funded by the
+#    National Institutes of Health through the NIH Roadmap for Medical Research,
+#    Grant U54 EB005149.
+#
+#  * Kitware, Inc.
+#=============================================================================
+
+include(CheckLibraryExists)
+
+find_library(CURSES_NCURSESW_LIBRARY NAMES ncursesw
+  DOC "Path to libncursesw.so or .lib or .a")
+
+set(CURSES_USE_NCURSES FALSE)
+set(CURSES_USE_NCURSESW FALSE)
+
+if(CURSES_NCURSESW_LIBRARY)
+  set(CURSES_USE_NCURSES TRUE)
+  set(CURSES_USE_NCURSESW TRUE)
+endif()
+
+if(CURSES_USE_NCURSESW)
+  get_filename_component(_cursesLibDir "${CURSES_NCURSESW_LIBRARY}" PATH)
+  get_filename_component(_cursesParentDir "${_cursesLibDir}" PATH)
+
+  find_path(CURSES_INCLUDE_PATH
+    NAMES ncursesw/ncurses.h ncursesw/curses.h
+    HINTS "${_cursesParentDir}/include"
+    )
+
+  # Previous versions of FindCurses provided these values.
+  if(NOT DEFINED CURSES_LIBRARY)
+    set(CURSES_LIBRARY "${CURSES_NCURSESW_LIBRARY}")
+  endif()
+
+  CHECK_LIBRARY_EXISTS("${CURSES_NCURSESW_LIBRARY}"
+    cbreak "" CURSES_NCURSESW_HAS_CBREAK)
+  if(NOT CURSES_NCURSESW_HAS_CBREAK)
+    find_library(CURSES_EXTRA_LIBRARY tinfo HINTS "${_cursesLibDir}"
+      DOC "Path to libtinfo.so or .lib or .a")
+    find_library(CURSES_EXTRA_LIBRARY tinfo )
+  endif()
+
+  # Report whether each possible header name exists in the include directory.
+  if(NOT DEFINED CURSES_HAVE_NCURSESW_NCURSES_H)
+    if(EXISTS "${CURSES_INCLUDE_PATH}/ncursesw/ncurses.h")
+      set(CURSES_HAVE_NCURSESW_NCURSES_H "${CURSES_INCLUDE_PATH}/ncursesw/ncurses.h")
+    else()
+      set(CURSES_HAVE_NCURSESW_NCURSES_H "CURSES_HAVE_NCURSESW_NCURSES_H-NOTFOUND")
+    endif()
+  endif()
+  if(NOT DEFINED CURSES_HAVE_NCURSESW_CURSES_H)
+    if(EXISTS "${CURSES_INCLUDE_PATH}/ncursesw/curses.h")
+      set(CURSES_HAVE_NCURSESW_CURSES_H "${CURSES_INCLUDE_PATH}/ncursesw/curses.h")
+    else()
+      set(CURSES_HAVE_NCURSESW_CURSES_H "CURSES_HAVE_NCURSESW_CURSES_H-NOTFOUND")
+    endif()
+  endif()
+
+  find_library(CURSES_FORM_LIBRARY form HINTS "${_cursesLibDir}"
+    DOC "Path to libform.so or .lib or .a")
+  find_library(CURSES_FORM_LIBRARY form )
+
+  # Need to provide the *_LIBRARIES
+  set(CURSES_LIBRARIES ${CURSES_LIBRARY})
+
+  if(CURSES_EXTRA_LIBRARY)
+    set(CURSES_LIBRARIES ${CURSES_LIBRARIES} ${CURSES_EXTRA_LIBRARY})
+  endif()
+
+  if(CURSES_FORM_LIBRARY)
+    set(CURSES_LIBRARIES ${CURSES_LIBRARIES} ${CURSES_FORM_LIBRARY})
+  endif()
+
+  # Provide the *_INCLUDE_DIRS result.
+  set(CURSES_INCLUDE_DIRS ${CURSES_INCLUDE_PATH})
+  set(CURSES_INCLUDE_DIR ${CURSES_INCLUDE_PATH}) # compatibility
+
+  # handle the QUIETLY and REQUIRED arguments and set CURSES_FOUND to TRUE if
+  # all listed variables are TRUE
+  include(FindPackageHandleStandardArgs)
+  FIND_PACKAGE_HANDLE_STANDARD_ARGS(Ncursesw DEFAULT_MSG
+    CURSES_LIBRARY CURSES_INCLUDE_PATH)
+  set(CURSES_FOUND ${NCURSESW_FOUND})
+
+else()
+  find_package(Curses)
+  set(NCURSESW_FOUND FALSE)
+endif()
+
+mark_as_advanced(
+  CURSES_INCLUDE_PATH
+  CURSES_CURSES_LIBRARY
+  CURSES_NCURSES_LIBRARY
+  CURSES_NCURSESW_LIBRARY
+  CURSES_EXTRA_LIBRARY
+  CURSES_FORM_LIBRARY
+  )