From 592a6017bc08d453a9a58c97a8f568105b31bdbb Mon Sep 17 00:00:00 2001
From: Mike Taves <mwtoews@gmail.com>
Date: Sun, 9 May 2021 00:09:56 +1200
Subject: CMake: "make dist" workalike via CPack (#2690)

---
 CMakeLists.txt         | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 cmake/Makefile.am      |  1 +
 cmake/ProjReadme.cmake | 28 +++++++++++++++++++++++++
 travis/install.sh      | 14 ++++++++++++-
 4 files changed, 99 insertions(+), 1 deletion(-)
 create mode 100644 cmake/ProjReadme.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 67a8d2e1..bb1fdf93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -333,3 +333,60 @@ if(UNIX OR MINGW)
     ${CMAKE_CURRENT_BINARY_DIR}/proj.pc
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 endif()
+
+################################################################################
+# "make dist" workalike
+################################################################################
+
+set(CPACK_SOURCE_GENERATOR "TGZ;ZIP")
+set(CPACK_SOURCE_PACKAGE_FILE_NAME "proj-${PROJ_VERSION}")
+set(CPACK_PACKAGE_VENDOR "OSGeo")
+set(CPACK_PACKAGE_VERSION_MAJOR ${PROJ_VERSION_MAJOR})
+set(CPACK_PACKAGE_VERSION_MINOR ${PROJ_VERSION_MINOR})
+set(CPACK_PACKAGE_VERSION_PATCH ${PROJ_VERSION_PATCH})
+set(CPACK_VERBATIM_VARIABLES TRUE)
+set(CPACK_SOURCE_IGNORE_FILES
+  /\\..*  # any file/directory starting with .
+  /.*\\.yml
+  /.*\\.gz
+  /.*\\.zip
+  /.*build.*/
+  \\.deps
+  /autogen\\.sh
+  /autom4te\\.cache
+  /CODE_OF_CONDUCT.md
+  /CONTRIBUTING.md
+  /Dockerfile
+  /docs/
+  /Doxyfile
+  /examples/
+  /HOWTO-RELEASE
+  /m4/lt*
+  /m4/libtool*
+  /media/
+  /schemas/
+  /scripts/
+  /test/fuzzers/
+  /test/gigs/.*gie\\.failing
+  /test/postinstall/
+  /travis/
+  ${PROJECT_BINARY_DIR}
+)
+
+include(CPack)
+
+# Simplify README.md to README
+add_custom_target(README
+  COMMAND ${CMAKE_COMMAND}
+    -D PROJ_SOURCE_DIR=${PROJ_SOURCE_DIR}
+    -P ${PROJ_SOURCE_DIR}/cmake/ProjReadme.cmake
+)
+
+get_property(_is_multi_config_generator GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _is_multi_config_generator)
+  add_custom_target(dist
+    COMMAND ${CMAKE_MAKE_PROGRAM} package_source
+    DEPENDS README
+  )
+  message(STATUS "PROJ: Configured 'dist' target")
+endif()
diff --git a/cmake/Makefile.am b/cmake/Makefile.am
index 1ecd784e..cdad1ff8 100644
--- a/cmake/Makefile.am
+++ b/cmake/Makefile.am
@@ -4,6 +4,7 @@ EXTRA_DIST = CMakeLists.txt \
 			proj_config.cmake.in \
 			ProjConfig.cmake \
 			ProjMac.cmake \
+			ProjReadme.cmake \
 			ProjTest.cmake \
 			ProjVersion.cmake \
 			policies.cmake \
diff --git a/cmake/ProjReadme.cmake b/cmake/ProjReadme.cmake
new file mode 100644
index 00000000..7071a381
--- /dev/null
+++ b/cmake/ProjReadme.cmake
@@ -0,0 +1,28 @@
+#
+# CMake script to modify README.md to create simpler README file
+#
+# This is equivalent to: fgrep -v "[!["
+#
+
+set(SourceFile "${PROJ_SOURCE_DIR}/README.md")
+set(DestFile "${PROJ_SOURCE_DIR}/README")
+
+# Below is based on https://stackoverflow.com/a/30227627
+
+file(READ ${SourceFile} Contents)
+
+# Set the variable "Esc" to the ASCII value 27 as a special escape value
+string(ASCII 27 Esc)
+
+# Turn the contents into a list of strings, each ending with Esc
+string(REGEX REPLACE "\n" "${Esc};" ContentsAsList "${Contents}")
+
+unset(ModifiedContents)
+foreach(Line ${ContentsAsList})
+  if(NOT "${Line}" MATCHES "\\[!\\[")
+    # Swap the appended Esc character back out in favour of a line feed
+    string(REGEX REPLACE "${Esc}" "\n" Line ${Line})
+    set(ModifiedContents "${ModifiedContents}${Line}")
+  endif()
+endforeach()
+file(WRITE ${DestFile} ${ModifiedContents})
diff --git a/travis/install.sh b/travis/install.sh
index ea271d92..a07e7784 100755
--- a/travis/install.sh
+++ b/travis/install.sh
@@ -28,7 +28,19 @@ make dist-all >/dev/null
 TAR_FILENAME=`ls *.tar.gz`
 TAR_DIRECTORY=`basename $TAR_FILENAME .tar.gz`
 tar xvzf $TAR_FILENAME
-cd $TAR_DIRECTORY
+cd ..
+
+# compare with CMake's dist
+mkdir build_cmake
+cd build_cmake
+cmake -DBUILD_TESTING=OFF ..
+make dist
+tar xzf $TAR_FILENAME
+cd ..
+diff -qr build_autoconf/$TAR_DIRECTORY build_cmake/$TAR_DIRECTORY || true
+
+# continue build from autoconf
+cd build_autoconf/$TAR_DIRECTORY
 
 # There's a nasty #define CS in a Solaris system header. Avoid being caught about that again
 CXXFLAGS="-DCS=do_not_use_CS_for_solaris_compat $CXXFLAGS"
-- 
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