Doxygen: Make Doxygen only produce liblzma API documentation by default.

Doxygen is now configurable in autotools only with
--enable-doxygen=[api|all]. The default is "api", which will only
generate HTML output for liblzma API functions. The LaTex documentation
output was also disabled.

Doxyfile.in

@@ -20,7 +20,7 @@
 # The PROJECT_NAME tag is a single word (or a sequence of words surrounded
 # by quotes) that should identify the project.
 
-PROJECT_NAME           = "@PACKAGE_NAME@"
+PROJECT_NAME           = "@doxygen_project_name@"
 
 # The PROJECT_NUMBER tag can be used to enter a project or revision number.
 # This could be handy for archiving the generated documentation or
@@ -96,7 +96,7 @@ ABBREVIATE_BRIEF       =
 # Doxygen will generate a detailed section even if there is only a brief
 # description.
 
-ALWAYS_DETAILED_SEC    = YES
+ALWAYS_DETAILED_SEC    = NO
 
 # If the INLINE_INHERITED_MEMB tag is set to YES, doxygen will show all
 # inherited members of a class in the documentation of that class as if those
@@ -118,7 +118,7 @@ FULL_PATH_NAMES        = YES
 # If left blank the directory from which doxygen is run is used as the
 # path to strip.
 
-STRIP_FROM_PATH        = @top_srcdir@/src
+STRIP_FROM_PATH        = @top_srcdir@/@doxygen_input_path@
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of
 # the path mentioned in the documentation of a class, which tells
@@ -220,18 +220,18 @@ EXTRACT_ALL            = NO
 # If the EXTRACT_PRIVATE tag is set to YES all private members of a class
 # will be included in the documentation.
 
-EXTRACT_PRIVATE        = YES
+EXTRACT_PRIVATE        = @doxygen_extract_private@
 
 # If the EXTRACT_STATIC tag is set to YES all static members of a file
 # will be included in the documentation.
 
-EXTRACT_STATIC         = YES
+EXTRACT_STATIC         = @doxygen_extract_private@
 
 # If the EXTRACT_LOCAL_CLASSES tag is set to YES classes (and structs)
 # defined locally in source files will be included in the documentation.
 # If set to NO only classes defined in header files are included.
 
-EXTRACT_LOCAL_CLASSES  = YES
+EXTRACT_LOCAL_CLASSES  = @doxygen_extract_private@
 
 # If the HIDE_UNDOC_MEMBERS tag is set to YES, Doxygen will hide all
 # undocumented members of documented classes, files or namespaces.
@@ -439,7 +439,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = @top_srcdir@/src
+INPUT                  = @top_srcdir@/@doxygen_input_path@
 
 # If the value of the INPUT tag contains directories, you can use the
 # FILE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp
@@ -448,7 +448,7 @@ INPUT                  = @top_srcdir@/src
 # *.c *.cc *.cxx *.cpp *.c++ *.java *.ii *.ixx *.ipp *.i++ *.inl *.h *.hh *.hxx
 # *.hpp *.h++ *.idl *.odl *.cs *.php *.php3 *.inc *.m *.mm *.py
 
-FILE_PATTERNS          = *.h *.c
+FILE_PATTERNS          = *.c *.h
 
 # The RECURSIVE tag can be used to turn specify whether or not subdirectories
 # should be searched for input files as well. Possible values are YES and NO.
@@ -724,7 +724,7 @@ TREEVIEW_WIDTH         = 250
 # If the GENERATE_LATEX tag is set to YES (the default) Doxygen will
 # generate Latex output.
 
-GENERATE_LATEX         = YES
+GENERATE_LATEX         = NO
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put.
 # If a relative path is entered the value of OUTPUT_DIRECTORY will be

configure.ac

@@ -520,6 +520,45 @@ AC_ARG_ENABLE([doc], [AS_HELP_STRING([--disable-doc],
 AM_CONDITIONAL([COND_DOC], [test x$enable_doc != xno])
 
 
+###########
+# Doxygen #
+###########
+
+# Doxygen can be enabled in two different modes:
+# api - Only generate Doxygen html pages for liblzma API headers.
+# all - Generate Doxygen html pages for every file.
+# api mode is the default because the primary purpose for the doxygen
+# documentation is to publicaly describe liblzma's API. The other html
+# pages are only useful for those who want to understand or alter the
+# internals of xz and liblzma.
+
+AC_ARG_ENABLE([doxygen], [AS_HELP_STRING([--enable-doxygen=SCOPE],
+		[Doxygen SCOPE can be `all`, or `api`.
+		The default is `api`, which will generate doxygen html
+		for liblzma API. The `all` option will generate doxygen
+		html for every .c and .h file.])],
+		[], [enable_doxygen=api])
+case $enable_doxygen in
+	api)
+		doxygen_project_name="liblzma ($PACKAGE_NAME)"
+		doxygen_extract_private=NO
+		doxygen_input_path=src/liblzma/api
+		;;
+	all)
+		doxygen_project_name="$PACKAGE_NAME"
+		doxygen_extract_private=YES
+		doxygen_input_path=src
+		;;
+	*)
+		AC_MSG_ERROR([--enable-doxygen only accepts `all` or `api])
+		;;
+esac
+
+AC_SUBST([doxygen_project_name])
+AC_SUBST([doxygen_extract_private])
+AC_SUBST([doxygen_input_path])
+
+
 ##############
 # Sandboxing #
 ##############