Add a CMake option to generate driver (developer) documentation.

Generating driver documentation can now be configured with CMake. The new
configuration OPTION_INCLUDE_DRIVER_DOCUMENTATION is "marked as advanced"
since only advanced users and/or FLTK developers need this.

Previously this could only be achieved by editing documentation/Doxyfile.in.

Added missing documentation option descriptions as well.

4 files changed, 40 insertions, 8 deletions

diff --git a/CMake/options.cmake b/CMake/options.cmake
index bc3aa7e69..c747484bd 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -142,6 +142,10 @@ option(OPTION_FILESYSTEM_SUPPORT "allow file system support" ON)
 if(DOXYGEN_FOUND)
     option(OPTION_BUILD_HTML_DOCUMENTATION "build html docs" OFF)
     option(OPTION_INSTALL_HTML_DOCUMENTATION "install html docs" OFF)
+
+    option(OPTION_INCLUDE_DRIVER_DOCUMENTATION "include driver (developer) docs" OFF)
+    mark_as_advanced(OPTION_INCLUDE_DRIVER_DOCUMENTATION)
+
     if(LATEX_FOUND)
       option(OPTION_BUILD_PDF_DOCUMENTATION "build pdf docs" OFF)
       option(OPTION_INSTALL_PDF_DOCUMENTATION "install pdf docs" OFF)
diff --git a/README.CMake.txt b/README.CMake.txt
index 142603dad..88c48d679 100644
--- a/README.CMake.txt
+++ b/README.CMake.txt
@@ -103,11 +103,11 @@ OPTION_ARCHFLAGS - default EMPTY
    Extra architecture flags.
 
 OPTION_APPLE_X11 - default OFF
-   In case you want to use X11 on OSX.
+   In case you want to use X11 on macOS.
    Use this only if you know what you do, and if you have installed X11.
 
 OPTION_USE_POLL - default OFF
-   Don't use this one either.
+   Don't use this one either, it is deprecated.
 
 OPTION_BUILD_SHARED_LIBS - default OFF
    Normally FLTK is built as static libraries which makes more portable
@@ -117,10 +117,10 @@ OPTION_BUILD_EXAMPLES - default ON
    Builds the many fine example programs.
 
 OPTION_CAIRO - default OFF
-   Enables libcairo support - see README.CMake.txt.
+   Enables libcairo support - see README.Cairo.txt.
 
 OPTION_CAIROEXT - default OFF
-   Enables extended libcairo support - see README.CMake.txt.
+   Enables extended libcairo support - see README.Cairo.txt.
 
 OPTION_USE_GL - default ON
    Enables OpenGL support.
@@ -169,6 +169,28 @@ OPTION_PRINT_SUPPORT - default ON
    is somewhat smaller. This option makes sense only on the Unix/Linux
    platform or when OPTION_APPLE_X11 is ON.
 
+
+Documentation options: these options are only available if `doxygen' is
+   installed and found by CMake. PDF related options require also `latex'.
+
+OPTION_BUILD_HTML_DOCUMENTATION - default OFF
+OPTION_BUILD_PDF_DOCUMENTATION - default OFF
+   These options can be used to switch HTML documentation generation with
+   doxygen on. The build targets ('html', 'pdf', or 'docs') need still to
+   be executed explicitly.
+
+OPTION_INCLUDE_DRIVER_DOCUMENTATION - default OFF
+   This option adds driver documentation to HTML and PDF docs (if ON). This
+   option is marked as "advanced" since it is only useful for FLTK developers
+   or advanced users.
+
+OPTION_INSTALL_HTML_DOCUMENTATION - default OFF
+OPTION_INSTALL_PDF_DOCUMENTATION - default OFF
+   If these options are ON then the HTML and/or PDF docs get installed
+   when the 'install' target is executed, e.g. with `make install'. You
+   need to select above options OPTION_BUILD_*_DOCUMENTATION as well.
+
+
  2.3  Building under Linux with Unix Makefiles
 -----------------------------------------------
 
@@ -543,3 +565,4 @@ Apr 07 2015 - AlbrechtS: update use example and more docs
 Jan 31 2016 - msurette: custom command instead of fltk_wrap_ui
 Nov 01 2016 - AlbrechtS: remove deprecated FLTK_USE_FILE, add MinGW build
 Jul 05 2017 - matt: added instructions for MacOS and Xcode
+Dec 29 2018 - AlbrechtS: add documentation option descriptions
diff --git a/documentation/CMakeLists.txt b/documentation/CMakeLists.txt
index 720af95d3..cec1f5104 100644
--- a/documentation/CMakeLists.txt
+++ b/documentation/CMakeLists.txt
@@ -18,6 +18,14 @@
 
 set (DOCS)
 
+set (FL_VERSION "${FLTK_VERSION_FULL}")
+
+if (OPTION_INCLUDE_DRIVER_DOCUMENTATION)
+  set (DRIVER_DOCS "DriverDev")
+else ()
+  set (DRIVER_DOCS "")
+endif ()
+
 #--------------------------
 # build html documentation
 #--------------------------
@@ -31,7 +39,6 @@ if(OPTION_BUILD_HTML_DOCUMENTATION)
     set(GENERATE_HTML	YES)
     set(GENERATE_LATEX	NO)
     set(LATEX_HEADER	"")
-    set(FL_VERSION	"${FLTK_VERSION_FULL}")
 
     configure_file(
 	${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in
@@ -64,7 +71,6 @@ if (OPTION_BUILD_PDF_DOCUMENTATION)
     set(GENERATE_HTML	NO)
     set(GENERATE_LATEX	YES)
     set(LATEX_HEADER	"${CMAKE_CURRENT_BINARY_DIR}/fltk-book.tex")
-    set(FL_VERSION	"${FLTK_VERSION_FULL}")
 
     configure_file(
 	${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in
diff --git a/documentation/Doxyfile.in b/documentation/Doxyfile.in
index d5a7a7681..58bc2b67f 100644
--- a/documentation/Doxyfile.in
+++ b/documentation/Doxyfile.in
@@ -437,8 +437,7 @@ GENERATE_DEPRECATEDLIST= YES
 # The ENABLED_SECTIONS tag can be used to enable conditional
 # documentation sections, marked by \if sectionname ... \endif.
 
-ENABLED_SECTIONS       = 
-# ENABLED_SECTIONS       += DriverDev
+ENABLED_SECTIONS       = @DRIVER_DOCS@
 
 # The MAX_INITIALIZER_LINES tag determines the maximum number of lines
 # the initial value of a variable or define consists of for it to appear in