add SNAP library

- cmake/GetSNAP.cmake: add module that uses ExternalProject to download and
	build (with make) the SNAP library.
- CMakeLists.txt: simple cmake file to use the GetSNAP module.
- src/main.cc: simples possible main file.
- src/CMakeLists.txt: simple cmake file with main executable and linking.

Signed-off-by: Aiden Woodruff <woodra@rpi.edu>

5 files changed, 45 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 837db7b..a7a32be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 # LaTeX auxiliary files
 .aux/
+
+# CMake build folder
+build/
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..da1f520
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.12)
+project(tipping-points LANGUAGES CXX)
+
+cmake_policy(SET CMP0135 NEW)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+include(GetSNAP)
+
+add_subdirectory(src)
+if(BUILD_TESTING)
+        add_subdirectory(test)
+endif()
diff --git a/cmake/GetSNAP.cmake b/cmake/GetSNAP.cmake
new file mode 100644
index 0000000..87b8c65
--- /dev/null
+++ b/cmake/GetSNAP.cmake
@@ -0,0 +1,21 @@
+include(ExternalProject)
+ExternalProject_Add(
+        SNAP
+        DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}
+        DOWNLOAD_NO_PROGRESS TRUE
+        URL https://snap.stanford.edu/releases/Snap-6.0.zip
+        URL_MD5 e32a1dbea584ba4f287c616627a71ac5
+        CONFIGURE_COMMAND ""
+        BUILD_IN_SOURCE TRUE
+        BUILD_COMMAND make
+        COMMAND make -C snap-core lib
+        INSTALL_COMMAND ""
+        LOG_BUILD TRUE
+)
+ExternalProject_Get_Property(SNAP SOURCE_DIR)
+set(SNAP_SOURCE_DIR "${SOURCE_DIR}")
+add_library(SNAP::SNAP STATIC IMPORTED)
+set_property(TARGET SNAP::SNAP
+        PROPERTY IMPORTED_LOCATION
+        ${SNAP_SOURCE_DIR}/snap-core/libsnap.a
+)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..c66a468
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(main main.cc)
+target_link_libraries(main PRIVATE SNAP::SNAP)
diff --git a/src/main.cc b/src/main.cc
new file mode 100644
index 0000000..6e80c53
--- /dev/null
+++ b/src/main.cc
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main(int argc, char* argv[]) {
+        std::cout << "Hello world." << std::endl;
+        return 0;
+}