cmake: Add support for generating .qrc files

[quassel.git] / cmake / GenerateQrc.cmake

diff --git a/cmake/GenerateQrc.cmake b/cmake/GenerateQrc.cmake
new file mode 100644 (file)
index 0000000..4614e49
--- /dev/null
+++ b/cmake/GenerateQrc.cmake
@@ -0,0 +1,37 @@
+# Generates a .qrc file named ${QRC_FILE} with path prefix ${PREFIX}, containing
+# all files matching the glob ${PATTERNS} in the current working directory.
+# This script is intended to be executed using the cmake -P syntax, so the
+# arguments we're interested in start at ARGV3.
+
+set(QRC_FILE ${CMAKE_ARGV3})
+set(PREFIX   ${CMAKE_ARGV4})
+set(PATTERNS ${CMAKE_ARGV5})
+
+# Find all files matching PATTERNS in the current working directory
+if (PATTERNS)
+    file(GLOB_RECURSE files RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} ${PATTERNS})
+endif()
+
+# Generate a temporary file first, so we don't touch the real thing unless something changed
+set(qrc_tmp ${QRC_FILE}.tmp)
+file(WRITE ${qrc_tmp} "<!DOCTYPE RCC>\n<RCC version=\"1.0\">\n<qresource prefix=\"/${PREFIX}\">\n")
+foreach(file ${files})
+    # Record the timestamp of last modification so changes are detected
+    file(TIMESTAMP ${file} timestamp)
+    file(APPEND ${qrc_tmp} "    <file timestamp=\"${timestamp}\">${file}</file>\n")
+endforeach()
+file(APPEND ${qrc_tmp} "</qresource>\n</RCC>\n")
+
+# Check if the newly generated file has the same contents (including timestamps) as the existing one.
+# If the files are the same, don't touch the original to avoid useless rebuilds.
+if (EXISTS ${QRC_FILE})
+    file(MD5 ${QRC_FILE} orig_sum)
+    file(MD5 ${qrc_tmp}  tmp_sum)
+    if (NOT orig_sum STREQUAL tmp_sum)
+        file(RENAME ${qrc_tmp} ${QRC_FILE})
+    else()
+        file(REMOVE ${qrc_tmp})
+    endif()
+else()
+    file(RENAME ${qrc_tmp} ${QRC_FILE})
+endif()