Fix Doxygen version numbers

This also removes Doxygen from the CMake build system.  It doesn't seem
worth trying to make it work both ways.

Fixes: https://gitlab.desy.de/thomas.white/crystfel/-/issues/48

4 files changed, 10 insertions, 21 deletions

diff --git a/libcrystfel/CMakeLists.txt b/libcrystfel/CMakeLists.txt
index 77290677..83f1e983 100644
--- a/libcrystfel/CMakeLists.txt
+++ b/libcrystfel/CMakeLists.txt
@@ -8,7 +8,6 @@ find_package(ZLIB REQUIRED)
 find_package(FLEX REQUIRED)
 find_package(BISON REQUIRED)
 pkg_check_modules(MSGPACK msgpack)
-find_package(Doxygen)
 pkg_check_modules(FFTW fftw3)
 pkg_check_modules(LIBCCP4 libccp4c)
 
@@ -103,16 +102,6 @@ set(LIBCRYSTFEL_HEADERS
     src/fom.h
 )
 
-if (DOXYGEN_FOUND)
-  configure_file(${PROJECT_SOURCE_DIR}/doc/index.md index.md)
-  set(DOXYGEN_SHOW_INCLUDE_FILES NO)
-  set(DOXYGEN_WARN_IF_UNDOCUMENTED NO)
-  set(DOXYGEN_PREDEFINED HAVE_FFTW)
-  doxygen_add_docs(api-docs ${PROJECT_SOURCE_DIR}/src
-                   ${CMAKE_CURRENT_BINARY_DIR}/index.md
-                   ${PROJECT_SOURCE_DIR}/doc/coding.md)
-endif (DOXYGEN_FOUND)
-
 add_library(${PROJECT_NAME} SHARED
             ${LIBCRYSTFEL_SOURCES}
             ${CMAKE_CURRENT_BINARY_DIR}/libcrystfel-version.c
diff --git a/libcrystfel/doc/Doxyfile.in b/libcrystfel/doc/Doxyfile.in
index b3d42b18..0c74bfce 100644
--- a/libcrystfel/doc/Doxyfile.in
+++ b/libcrystfel/doc/Doxyfile.in
@@ -38,7 +38,7 @@ PROJECT_NAME           = "libcrystfel"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = @VERSION@
+@INCLUDE = "libcrystfel/Doxyfile-version"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
@@ -251,7 +251,7 @@ TAB_SIZE               = 4
 # commands \{ and \} for these it is advised to use the version @{ and @} or use
 # a double escape (\\{ and \\})
 
-ALIASES                =
+ALIASES                = apirevision=@API_REVISION@
 
 # This tag can be used to specify a number of word-keyword mappings (TCL only).
 # A mapping has the form "name=value". For example adding "class=itcl::class"
diff --git a/libcrystfel/doc/index.md b/libcrystfel/doc/index.md
index f1c72ed4..fc4275f4 100644
--- a/libcrystfel/doc/index.md
+++ b/libcrystfel/doc/index.md
@@ -1,10 +1,5 @@
 \mainpage libcrystfel index page
 
-Version
-=======
-This documentation is for libcrystfel from CrystFEL ${CRYSTFEL_VERSION}, API
-revision ${CRYSTFEL_API_VERSION}.
-
 Abstract
 ========
 This is the internal documentation for CrystFEL.  Unless you are looking at
@@ -13,6 +8,8 @@ this.  You might use the information here when reading the code or to better
 understand how the software works, or refer to it when creating a new
 program within the suite.
 
+API revision \apirevision.
+
 Coding standards
 ================
 Please see the \ref coding "section on coding standards" for CrystFEL's coding
diff --git a/libcrystfel/meson.build b/libcrystfel/meson.build
index 968e58a3..05c80473 100644
--- a/libcrystfel/meson.build
+++ b/libcrystfel/meson.build
@@ -174,8 +174,8 @@ install_headers(['src/reflist.h',
 doxygen = find_program('doxygen', required: false)
 
 if doxygen.found()
-  index_md = files('doc/index.md')
-  coding_md = files('doc/coding.md')
+  vers = vcs_tag(input: 'doc/Doxyfile-version.in',
+                 output: 'Doxyfile-version')
 
   doc_data = configuration_data()
   doc_data.set('DOX_TOP', join_paths(meson.current_source_dir(), 'src'))
@@ -183,13 +183,16 @@ if doxygen.found()
   doc_data.set('CODING_MD', join_paths(meson.current_source_dir(), 'doc/coding.md'))
   doc_data.set('OUTPUT_DIR', join_paths(meson.current_build_dir(), 'docs'))
   doc_data.set('VERSION', meson.project_version())
+  doc_data.set('API_REVISION', libcrystfel_api_version)
 
   doxyfile = configure_file(input: 'doc/Doxyfile.in',
                             output: 'Doxyfile',
                             configuration: doc_data,
                             install: false)
 
-  api_docs = run_target('api-docs', command: [doxygen, doxyfile])
+  api_docs = run_target('api-docs',
+                        command: [doxygen, doxyfile],
+                        depends: vers)
 endif