cmake: simplify manpage generation

CMakeLists.txt

@@ -72,31 +72,34 @@ INSTALL(
     DESTINATION /etc/sway/
 )
 
-ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/sway.1
-  COMMAND ${A2X_COMMAND} --no-xmllint --doctype manpage --format manpage
-    -D ${CMAKE_RUNTIME_OUTPUT_DIRECTORY} ${CMAKE_CURRENT_SOURCE_DIR}/sway.1.txt 
-  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/sway.1.txt
-)
-
-ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/sway.5
-  COMMAND ${A2X_COMMAND} --no-xmllint --doctype manpage --format manpage
-    -D ${CMAKE_RUNTIME_OUTPUT_DIRECTORY} ${CMAKE_CURRENT_SOURCE_DIR}/sway.5.txt 
-  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/sway.5.txt
-)
-
-ADD_CUSTOM_TARGET(man ALL
-  DEPENDS ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/sway.1
-  DEPENDS ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/sway.5)
-
-INSTALL(
-  FILES ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/sway.1
-  DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man1
-)
-
-INSTALL(
-  FILES ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/sway.5
-  DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man5
-)
+add_custom_target(man ALL)
+
+function (add_manpage name section)
+  add_custom_command(
+    OUTPUT  "${CMAKE_CURRENT_BINARY_DIR}/${name}.${section}"
+    COMMAND "${A2X_COMMAND}"
+            --no-xmllint
+            --doctype manpage
+            --format manpage
+            -D "${CMAKE_CURRENT_BINARY_DIR}"
+            "${CMAKE_CURRENT_SOURCE_DIR}/${name}.${section}.txt"
+    DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${name}.${section}.txt"
+    COMMENT "Generating manpage for ${name}.${section}")
+
+  add_custom_target("man-${name}.${section}"
+    DEPENDS
+      "${CMAKE_CURRENT_BINARY_DIR}/${name}.${section}")
+  add_dependencies(man
+    "man-${name}.${section}")
+
+  install(
+    FILES       "${CMAKE_CURRENT_BINARY_DIR}/${name}.${section}"
+    DESTINATION "share/man/man${section}"
+    COMPONENT   documentation)
+endfunction ()
+
+add_manpage(sway 1)
+add_manpage(sway 5)
 
 INSTALL(
   FILES ${PROJECT_SOURCE_DIR}/sway.desktop