CMake/Modules/FindGnuplot.cmake

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# FindGnuplot
# -----------
#
# this module looks for gnuplot
#
#
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#
# Once done this will define
#
# ::
#
# GNUPLOT_FOUND - system has Gnuplot
# GNUPLOT_EXECUTABLE - the Gnuplot executable
# GNUPLOT_VERSION_STRING - the version of Gnuplot found (since CMake 2.8.8)
#
#
#
# GNUPLOT_VERSION_STRING will not work for old versions like 3.7.1.
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include(${CMAKE_CURRENT_LIST_DIR}/FindCygwin.cmake)
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find_program(GNUPLOT_EXECUTABLE
NAMES
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gnuplot
pgnuplot
wgnupl32
PATHS
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${CYGWIN_INSTALL_PATH}/bin
)
if (GNUPLOT_EXECUTABLE)
execute_process(COMMAND "${GNUPLOT_EXECUTABLE}" --version
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OUTPUT_VARIABLE GNUPLOT_OUTPUT_VARIABLE
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REGEX REPLACE "^gnuplot ([0-9\\.]+)( patchlevel )?" "\\1." GNUPLOT_VERSION_STRING "${GNUPLOT_OUTPUT_VARIABLE}")
string(REGEX REPLACE "\\.$" "" GNUPLOT_VERSION_STRING "${GNUPLOT_VERSION_STRING}")
unset(GNUPLOT_OUTPUT_VARIABLE)
endif()
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# for compatibility
set(GNUPLOT ${GNUPLOT_EXECUTABLE})
# handle the QUIETLY and REQUIRED arguments and set GNUPLOT_FOUND to TRUE if
# all listed variables are TRUE
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(Gnuplot
REQUIRED_VARS GNUPLOT_EXECUTABLE
VERSION_VAR GNUPLOT_VERSION_STRING)
mark_as_advanced( GNUPLOT_EXECUTABLE )