wip: man pages

doc/CMakeLists.txt

@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.13)
+
+find_program(SCDOC_EXECUTABLE scdoc)
+find_program(GZIP_EXECUTABLE gzip)
+
+function(add_man_pages)
+  foreach (src ${ARGN})
+    string(REPLACE ".scd" ".gz" man "${src}")
+    string(REGEX MATCH "\.[0-9]+\.scd" man_target "${src}")
+    string(REGEX MATCH "[0-9]+" man_target "${man_target}")
+
+    add_custom_command(
+      OUTPUT ${man}
+      COMMENT "Generating man page ${man}"
+      COMMAND ${SCDOC_EXECUTABLE} < ${CMAKE_CURRENT_SOURCE_DIR}/${src} |
+      ${GZIP_EXECUTABLE} > ${man}
+      VERBATIM
+      MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/${src}
+      )
+
+    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${man}
+      DESTINATION share/man/man${man_target})
+  endforeach()
+
+  string(REPLACE ".scd" ".gz" out "${ARGN}")
+  list(TRANSFORM out PREPEND "${CMAKE_CURRENT_BINARY_DIR}/")
+  add_custom_target(man-pages ALL SOURCES ${ARGN} DEPENDS ${out})
+endfunction()
+
+add_man_pages(f00bar.1.scd f00bar.5.scd)