From 6bbbf1f857f4e1b0de3da37a1a184f27a8ee41c7 Mon Sep 17 00:00:00 2001
From: Gerhard Sittig <gerhard.sittig@gmx.net>
Date: Sun, 14 Oct 2018 16:05:04 +0200
Subject: [PATCH] manual: accept absence of the asciidoctor-pdf exectuable

The asciidoctor(1) executable is considered mandatory when building the
Pulseview manual. The asciidoctor-pdf(1) executable is not universally
available (is missing in Debian), accept its absence, avoid execution
failure in that case.

This implementation replaces the actual .txt to .pdf conversion with a
mere echo(1) message, which may go unnoticed in verbose build output.
"make --no-print-directories manual" may be required to remain aware.
---
 manual/CMakeLists.txt | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/manual/CMakeLists.txt b/manual/CMakeLists.txt
index bdbd6c9..2cfd263 100644
--- a/manual/CMakeLists.txt
+++ b/manual/CMakeLists.txt
@@ -38,17 +38,26 @@ add_custom_target(manual-html
 	WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
 	COMMENT "Generating manual, HTML output"
 )
-add_custom_target(manual-pdf
-	COMMAND ${ASCIIDOCTOR_PDF_EXECUTABLE}
-		-a stylesheet=${STYLE_SHEET}
-		-a stylesdir=${STYLES_DIR}
-		--destination-dir=${CMAKE_CURRENT_BINARY_DIR}
-		${MANUAL_SRC}
-	BYPRODUCTS ${MANUAL_OUT_PDF}
-	DEPENDS ${MANUAL_SRC}
-	WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-	COMMENT "Generating manual, HTML output"
-)
+if (ASCIIDOCTOR_PDF_EXECUTABLE)
+	add_custom_target(manual-pdf
+		COMMAND ${ASCIIDOCTOR_PDF_EXECUTABLE}
+			-a stylesheet=${STYLE_SHEET}
+			-a stylesdir=${STYLES_DIR}
+			--destination-dir=${CMAKE_CURRENT_BINARY_DIR}
+			${MANUAL_SRC}
+		BYPRODUCTS ${MANUAL_OUT_PDF}
+		DEPENDS ${MANUAL_SRC}
+		WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+		COMMENT "Generating manual, HTML output"
+	)
+else ()
+	add_custom_target(manual-pdf
+		COMMAND ${CMAKE_COMMAND} -E echo
+			"asciidoctor-pdf executable is missing, NOT generating HTML output"
+		DEPENDS ${MANUAL_SRC}
+		WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+	)
+endif ()
 add_custom_target(manual)
 add_dependencies(manual manual-html manual-pdf)
 
-- 
2.30.2