build(cmake/modules): cmake module for string-view-lite

The CMake module downloads `string-view-lite` from
https://github.com/martinmoene/string-view-lite

It is a single-file header-only version of C++17-like `string_view` for
C++98, C++03, C++11, and later.

Notices it also provides C++20 extensions like:

- empty()
- starts_with()
- ends_with()
- etc.

Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

cmake/modules/CPackConfig.cmake

@@ -1,3 +1,16 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
+
 set(CPACK_PACKAGE_NAME "${PACKAGE_NAME}")
 set(CPACK_PACKAGE_VENDOR "Cloud Native Computing Foundation (CNCF) cncf.io.")
 set(CPACK_PACKAGE_CONTACT "cncf-falco-dev@lists.cncf.io") # todo: change this once we've got @falco.org addresses

cmake/modules/Coverage.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/DownloadCatch.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/DownloadFakeIt.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/DownloadStringViewLite.cmake

@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
+
+include(ExternalProject)
+
+set(STRING_VIEW_LITE_PREFIX ${CMAKE_BINARY_DIR}/string-view-lite-prefix)
+set(STRING_VIEW_LITE_INCLUDE ${STRING_VIEW_LITE_PREFIX}/include)
+message(STATUS "Found string-view-lite: include: ${STRING_VIEW_LITE_INCLUDE}")
+
+ExternalProject_Add(
+  string-view-lite
+  PREFIX ${STRING_VIEW_LITE_PREFIX}
+  GIT_REPOSITORY "https://github.com/martinmoene/string-view-lite.git"
+  GIT_TAG "v1.4.0"
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  INSTALL_COMMAND
+    ${CMAKE_COMMAND} -E copy ${STRING_VIEW_LITE_PREFIX}/src/string-view-lite/include/nonstd/string_view.hpp
+    ${STRING_VIEW_LITE_INCLUDE}/nonstd/string_view.hpp)

cmake/modules/FindMakedev.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/GetFalcoVersion.cmake

@@ -1,3 +1,16 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
+
 # Retrieve git ref and commit hash
 include(GetGitRevisionDescription)
 

cmake/modules/OpenSSL.cmake

@@ -1,3 +1,15 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
 if(NOT USE_BUNDLED_DEPS)
   find_package(OpenSSL REQUIRED)
   message(STATUS "Found openssl: include: ${OPENSSL_INCLUDE_DIR}, lib: ${OPENSSL_LIBRARIES}")

cmake/modules/cURL.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/gRPC.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/jq.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/sysdig.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at

cmake/modules/yaml-cpp.cmake

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at