From 92c1bf783f699067b507e56a15977292a319c492 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Tue, 23 Aug 2022 22:32:45 +0200
Subject: Build with AsciiDoc as well as Asciidoctor

---
 CMakeLists.txt | 29 ++++++++++++++++++++---------
 README.adoc    |  2 +-
 2 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a685c0..5677dcb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -128,20 +128,31 @@ install (DIRECTORY contrib DESTINATION ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME})
 
 # Generate documentation from text markup
 find_program (ASCIIDOCTOR_EXECUTABLE asciidoctor)
-if (NOT ASCIIDOCTOR_EXECUTABLE)
-	message (FATAL_ERROR "asciidoctor not found")
+find_program (A2X_EXECUTABLE a2x)
+if (NOT ASCIIDOCTOR_EXECUTABLE AND NOT A2X_EXECUTABLE)
+	message (FATAL_ERROR "Neither asciidoctor nor a2x were found")
 endif ()
 
 foreach (page ${PROJECT_NAME})
 	set (page_output "${PROJECT_BINARY_DIR}/${page}.1")
 	list (APPEND project_MAN_PAGES "${page_output}")
-	add_custom_command (OUTPUT ${page_output}
-		COMMAND ${ASCIIDOCTOR_EXECUTABLE} -b manpage
-			-a release-version=${PROJECT_VERSION}
-			"${PROJECT_SOURCE_DIR}/${page}.adoc"
-			-o "${page_output}"
-		DEPENDS ${page}.adoc
-		COMMENT "Generating man page for ${page}" VERBATIM)
+	if (ASCIIDOCTOR_EXECUTABLE)
+		add_custom_command (OUTPUT ${page_output}
+			COMMAND ${ASCIIDOCTOR_EXECUTABLE} -b manpage
+				-a release-version=${PROJECT_VERSION}
+				-o "${page_output}"
+				"${PROJECT_SOURCE_DIR}/${page}.adoc"
+			DEPENDS ${page}.adoc
+			COMMENT "Generating man page for ${page}" VERBATIM)
+	elseif (A2X_EXECUTABLE)
+		add_custom_command (OUTPUT ${page_output}
+			COMMAND ${A2X_EXECUTABLE} --doctype manpage --format manpage
+				-a release-version=${PROJECT_VERSION}
+				-D "${PROJECT_BINARY_DIR}"
+				"${PROJECT_SOURCE_DIR}/${page}.adoc"
+			DEPENDS ${page}.adoc
+			COMMENT "Generating man page for ${page}" VERBATIM)
+	endif ()
 endforeach ()
 
 add_custom_target (docs ALL DEPENDS ${project_MAN_PAGES})
diff --git a/README.adoc b/README.adoc
index 204316f..d634d57 100644
--- a/README.adoc
+++ b/README.adoc
@@ -37,7 +37,7 @@ The rest of this README will concern itself with externalities.
 
 Building
 --------
-Build dependencies: CMake, pkg-config, asciidoctor,
+Build dependencies: CMake, pkg-config, asciidoctor or asciidoc,
                     liberty (included), termo (included) +
 Runtime dependencies: ncursesw, libunistring, cURL +
 Optional runtime dependencies: fftw3, libpulse, x11, xft
-- 
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