Added a create_nix.sh.in file that turns into create_nix.sh after var…

…iable substitution. The substituted variables are enclosed in @ symbols. The script is then run when building so long as -DPACKAGE_NIX was passed to the configure step of cmake and install was specified when building. See https://github.com/bluescan/tacentview/wiki/Distributing

CMakeLists.txt

@@ -312,6 +312,23 @@ if (CMAKE_SYSTEM_NAME MATCHES Linux)
 			endif()
 			"
 		)
+	elseif (PACKAGE_NIX)
+		install(DIRECTORY Linux/ DESTINATION "${VIEWER_PACKAGE_DIR}")
+		configure_file("Linux/create_nix.sh.in" "${VIEWER_PACKAGE_DIR}/create_nix.sh" @ONLY)
+		install(CODE
+			"
+			execute_process(COMMAND \"chmod\" \"a+x\" \"ViewerInstall/Package/create_nix.sh\")
+			execute_process(
+				COMMAND \"ViewerInstall/Package/create_nix.sh\"
+				RESULT_VARIABLE package_result
+			)
+			if (NOT package_result EQUAL \"0\")
+				message(FATAL_ERROR \"Viewer -- Nix package creation failed.\")
+			else()
+				message(STATUS \"Viewer -- Nix package creation succeeded.\")
+			endif()
+			"
+		)
 	endif()
 endif()
 

Linux/create_nix.sh.in

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+cd @VIEWER_PACKAGE_DIR@
+declare -a Numbers=()
+
+# Version string is replaced here.
+VersionString="@PROJECT_VERSION_MAJOR@.@PROJECT_VERSION_MINOR@-@PROJECT_VERSION_PATCH@"
+
+PackageName="tacentview_${VersionString}"
+echo "Creating nix package: ${PackageName}"
+rm -rf ${PackageName}
+mkdir ${PackageName}
+
+#
+# THE BELOW IS DEB-SPECIFIC AND NEEDS TO BE UPDATED FOR NIX.
+# If a nix equivalent of deb_template is needed for Nix it should be
+# created. The main content in the template are the control files needed to
+# make a deb, plus the desktop icon files.
+#
+cp -rf deb_template/* ${PackageName}/
+
+# Here we do a replacement of some fields in one of the deb script files.
+# We replace <ViewerVersionString> with the actual version string.
+sed -i "s/<ViewerVersionString>/${VersionString}/" "${PackageName}/DEBIAN/control"
+
+cp ../tacentview "${PackageName}/usr/bin/tacentview"
+
+# png txt ttf
+cp -f ../Assets/*.png "${PackageName}/usr/share/tacentview/Assets/"
+cp -f ../Assets/*.txt "${PackageName}/usr/share/tacentview/Assets/"
+cp -f ../Assets/*.ttf "${PackageName}/usr/share/tacentview/Assets/"
+fakeroot dpkg-deb --build ${PackageName}