[libgpiod] [PATCH 2/5] doc: Use autotoolized Doxyfile

[Alexander Stein <alexander.stein@xxxxxxxxxxx>]

This has several advantages:
* More simplified Makefile.am
* Actually used doxygen config is available as a file
* Building doc out-of-tree is possible

Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxx>
---
 .gitignore              | 1 +
 Doxyfile => Doxyfile.in | 3 ++-
 Makefile.am             | 4 +---
 configure.ac            | 1 +
 4 files changed, 5 insertions(+), 4 deletions(-)
 rename Doxyfile => Doxyfile.in (95%)

diff --git a/.gitignore b/.gitignore
index 488d9d6..a77efde 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ doc
 # autotools stuff
 .deps/
 .libs/
+Doxyfile
 Makefile
 Makefile.in
 aclocal.m4
diff --git a/Doxyfile b/Doxyfile.in
similarity index 95%
rename from Doxyfile
rename to Doxyfile.in
index b194095..8c6d591 100644
--- a/Doxyfile
+++ b/Doxyfile.in
@@ -10,6 +10,7 @@
 
 # General configuration
 PROJECT_NAME           = libgpiod
+PROJECT_NUMBER         = @VERSION_STR@
 OUTPUT_DIRECTORY       = doc
 OUTPUT_LANGUAGE        = English
 EXTRACT_ALL            = NO
@@ -48,7 +49,7 @@ WARNINGS               = YES
 WARN_IF_UNDOCUMENTED   = YES
 WARN_FORMAT            =
 WARN_LOGFILE           =
-INPUT                  = include/gpiod.h
+INPUT                  = @top_srcdir@/include/gpiod.h @top_srcdir@/bindings/cxx/gpiod.hpp
 SOURCE_BROWSER         = YES
 INLINE_SOURCES         = NO
 REFERENCED_BY_RELATION = YES
diff --git a/Makefile.am b/Makefile.am
index d3f57b2..72e6a25 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,9 +29,7 @@ SUBDIRS += bindings
 if HAS_DOXYGEN
 
 doc:
-	@(cat Doxyfile; \
-		echo PROJECT_NUMBER = $(VERSION_STR); \
-		echo INPUT += bindings/cxx/gpiod.hpp) | doxygen -
+	@doxygen Doxyfile
 .PHONY: doc
 
 clean-local:
diff --git a/configure.ac b/configure.ac
index 008499d..c2d9f99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -207,6 +207,7 @@ if test "x$has_doxygen" = xfalse
 then
 	AC_MSG_NOTICE([doxygen not found - documentation cannot be generated])
 fi
+AM_COND_IF([HAS_DOXYGEN], [AC_CONFIG_FILES([Doxyfile])])
 
 if test "x$cross_compiling" = xno
 then
-- 
2.28.0