In new mode, look for a linenoise library

misc/CMake/BRLCAD_ExternalDeps.cmake

@@ -823,6 +823,12 @@ if (BRLCAD_ENABLE_GDAL)
   find_package(GDAL)
 endif (BRLCAD_ENABLE_GDAL)
 
+# Linenoise - line editing library
+# https://github.com/msteveb/linenoise
+find_package_reset(LINENOISE RESET_TP)
+set(LINENOISE_ROOT "${CMAKE_BINARY_DIR}")
+find_package(LINENOISE)
+
 # LMDB - Lightning Memory-Mapped Database
 # https://github.com/LMDB/lmdb
 find_package_reset(LMDB RESET_TP)

misc/CMake/FindLINENOISE.cmake

@@ -0,0 +1,76 @@
+#.rst:
+# FindLINENOISE
+# --------
+#
+# Find the native LINENOISE includes and library.
+#
+# IMPORTED Targets
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines :prop_tgt:`IMPORTED` target ``LINENOISE::LINENOISE``, if
+# LINENOISE has been found.
+#
+# Result Variables
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following variables:
+#
+# ::
+#
+#   LINENOISE_INCLUDE_DIRS   - where to find linenoise.h, etc.
+#   LINENOISE_LIBRARIES      - List of libraries when using linenoise.
+#   LINENOISE_FOUND          - True if linenoise found.
+#
+# Hints
+# ^^^^^
+#
+# A user may set ``LINENOISE_ROOT`` to a linenoise installation root to tell this
+# module where to look.
+
+#=============================================================================
+# Copyright 2001-2011 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+set(_LINENOISE_SEARCHES)
+
+# Search LINENOISE_ROOT first if it is set.
+if(LINENOISE_ROOT)
+  set(_LINENOISE_SEARCH_ROOT PATHS ${LINENOISE_ROOT} NO_DEFAULT_PATH)
+  list(APPEND _LINENOISE_SEARCHES _LINENOISE_SEARCH_ROOT)
+endif()
+
+set(LINENOISE_NAMES linenoise linenoised)
+
+# Try each search configuration.
+foreach(search ${_LINENOISE_SEARCHES})
+  find_path(LINENOISE_INCLUDE_DIR NAMES linenoise.h        ${${search}} PATH_SUFFIXES include include/linenoise)
+  find_library(LINENOISE_LIBRARY  NAMES ${LINENOISE_NAMES} ${${search}} PATH_SUFFIXES lib)
+endforeach()
+
+mark_as_advanced(LINENOISE_LIBRARY LINENOISE_INCLUDE_DIR)
+
+# handle the QUIETLY and REQUIRED arguments and set LINENOISE_FOUND to TRUE if
+# all listed variables are TRUE
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(LINENOISE REQUIRED_VARS LINENOISE_LIBRARY LINENOISE_INCLUDE_DIR)
+
+if(LINENOISE_FOUND)
+    set(LINENOISE_INCLUDE_DIRS ${LINENOISE_INCLUDE_DIR})
+    set(LINENOISE_LIBRARIES ${LINENOISE_LIBRARY})
+
+    if(NOT TARGET LINENOISE::LINENOISE)
+      add_library(LINENOISE::LINENOISE UNKNOWN IMPORTED)
+      set_target_properties(LINENOISE::LINENOISE PROPERTIES
+        IMPORTED_LOCATION "${LINENOISE_LIBRARY}"
+        INTERFACE_INCLUDE_DIRECTORIES "${LINENOISE_INCLUDE_DIRS}")
+    endif()
+endif()