add otr_prop for appending property strings

1 files changed, 75 insertions, 3 deletions

diff --git a/cmake/opentrack-boilerplate.cmake b/cmake/opentrack-boilerplate.cmake
index 4c056c3e..bb596951 100644
--- a/cmake/opentrack-boilerplate.cmake
+++ b/cmake/opentrack-boilerplate.cmake
@@ -75,7 +75,7 @@ endfunction()
 
 function(otr_compat target)
     if(NOT MSVC)
-        set_property(SOURCE ${${target}-moc} APPEND_STRING PROPERTY COMPILE_FLAGS " -w -Wno-error")
+        otr_prop(SOURCE ${${target}-moc} COMPILE_FLAGS "-w -Wno-error")
     endif()
     if(WIN32)
         target_link_libraries(${target} dinput8 dxguid strmiids)
@@ -97,8 +97,8 @@ function(otr_compat target)
         set(l-props "-Wl,--as-needed")
     endif()
 
-    set_property(TARGET ${target} APPEND_STRING PROPERTY COMPILE_FLAGS " ${c-props} ${arg_COMPILE}")
-    set_property(TARGET ${target} APPEND_STRING PROPERTY LINK_FLAGS " ${l-props} ${arg_LINK}")
+    otr_prop(TARGET ${target}   COMPILE_FLAGS "${c-props} ${arg_COMPILE}"
+                                LINK_FLAGS "${l-props} ${arg_LINK}")
 endfunction()
 
 include(CMakeParseArguments)
@@ -209,3 +209,75 @@ function(otr_module n_)
     set_property(GLOBAL APPEND PROPERTY opentrack-all-source-dirs "${CMAKE_CURRENT_SOURCE_DIR}")
 endfunction()
 
+function(otr_prop type)
+    set(files "")
+    set(opts ${ARGN})
+    # only SOURCE allows for multiple files
+    if(".${type}" STREQUAL ".SOURCE")
+        while(TRUE)
+            # keep popping first element off `opts' and adding to `files`
+            list(LENGTH opts len)
+            if(NOT "${len}" GREATER 0)
+                break()
+            endif()
+            list(GET opts 0 k)
+            string(FIND "${k}" "." idx1)
+            string(FIND "${k}" "/" idx2)
+            if("${idx1}" GREATER -1 AND "${idx2}" GREATER -1)
+                list(REMOVE_AT opts 0)
+                list(APPEND files "${k}")
+            else()
+                # not a pathname
+                break()
+            endif()
+        endwhile()
+        # no files, break early
+        # happens a few in the codebase
+        list(LENGTH files len)
+        if(len EQUAL 0)
+            return()
+        endif()
+    else()
+        # single file argument
+        set(opts "${ARGN}")
+        list(GET opts 0 files)
+        list(REMOVE_AT opts 0)
+    endif()
+    # must pass some properties at least
+    list(LENGTH opts len)
+    if(NOT "${len}" GREATER 1)
+        message(FATAL_ERROR "no properties given")
+    endif()
+
+    # prop name but no value
+    list(LENGTH opts len)
+    math(EXPR mod "${len} % 2")
+    if(NOT "${mod}" EQUAL 0)
+        message(FATAL_ERROR "must specify parameter for each property")
+    endif()
+
+    foreach(f ${files})
+        set(opts-copy "${opts}")
+
+        while(TRUE)
+            list(LENGTH opts-copy len)
+            if ("${len}" LESS 2)
+                break()
+            endif()
+
+            # pop off two elements, set property
+            list(GET opts-copy 0 name)
+            list(GET opts-copy 1 value)
+            list(REMOVE_AT opts-copy 1 0)
+
+            get_property(old "${type}" "${f}" PROPERTY "${name}")
+            if(".${old}" STREQUAL ".")
+                set(spc "")
+            else()
+                set(spc " ")
+            endif()
+
+            set_property("${type}" "${f}" APPEND_STRING PROPERTY "${name}" "${spc}${value}")
+        endwhile()
+    endforeach()
+endfunction()