Laid out the project structure.

.gitignore

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+/build/

CMakeLists.txt

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+cmake_minimum_required (VERSION 3.2)
+project(remwharead
+  VERSION 0.0.0
+  LANGUAGES CXX
+)
+
+set(WITH_MAN "YES" CACHE STRING "WITH_MAN defaults to \"YES\"")
+set(WITH_TESTS "NO" CACHE STRING "WITH_TESTS defaults to \"NO\"")
+
+include(GNUInstallDirs)
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(CURLPP REQUIRED curlpp)
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+set(CMAKE_CXX_FLAGS_DEBUG
+  "${CMAKE_CXX_FLAGS_DEBUG} -Wall -Wextra -Wpedantic -ftrapv \
+-fsanitize=undefined -g -Og -fno-omit-frame-pointer")
+
+include_directories(${PROJECT_SOURCE_DIR}/src)
+Include_directories(${PROJECT_BINARY_DIR})
+
+include_directories(${CURLPP_INCLUDE_DIRS})
+
+link_directories(${CURLPP_LIBRARY_DIRS})
+
+# Write version in header
+configure_file(
+    "${PROJECT_SOURCE_DIR}/src/version.hpp.in"
+    "${PROJECT_BINARY_DIR}/version.hpp"
+)
+
+file(GLOB sources src/*.cpp)
+add_executable(${PROJECT_NAME} "${sources}")
+target_link_libraries(${PROJECT_NAME} ${CURLPP_LIBRARIES})
+install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+if (WITH_MAN)
+  add_custom_command(
+    OUTPUT "${PROJECT_BINARY_DIR}/${PROJECT_NAME}.1"
+    WORKING_DIRECTORY "${PROJECT_BINARY_DIR}"
+    DEPENDS "${CMAKE_SOURCE_DIR}/${PROJECT_NAME}.1.adoc"
+    COMMAND ${CMAKE_SOURCE_DIR}/build_manpage.sh
+    ARGS ${PROJECT_VERSION})
+  add_custom_target(run ALL DEPENDS "${PROJECT_BINARY_DIR}/${PROJECT_NAME}.1")
+  install(
+    FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.1
+    DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
+endif()
+
+if(WITH_TESTS)
+  add_library(${PROJECT_NAME}_testlib SHARED ${sources})
+  target_link_libraries(${PROJECT_NAME}_testlib ${CURLPP_LIBRARIES})
+  include(tests.CMakeLists.txt)
+endif()

README.adoc

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+= remwharead
+
+*remwharead* helps you remembering what you read, and when.
+
+== Usage
+
+See https://schlomp.space/tastytea/remwharead/src/branch/master/remwharead.1.adoc[manpage].
+
+== Install
+
+////
+=== Gentoo
+
+Add my https://schlomp.space/tastytea/overlay[repository] and install it from
+there.
+
+[source,shellsession]
+----
+eselect repository enable tastytea
+echo "www-misc/remwharead ~amd64" >> /etc/portage/package.accept_keywords/remwharead
+emaint sync -r tastytea
+emerge -a www-misc/remwharead
+----
+////
+
+=== From source
+
+////
+==== Dependencies
+
+* Tested OS: Linux
+* C++ compiler (tested: https://gcc.gnu.org/[gcc] 5/6/7/8,
+  https://llvm.org/[clang] 3/5/6)
+* https://cmake.org/[cmake] (at least: 3.6)
+* https://pkgconfig.freedesktop.org/wiki/[pkgconfig] (tested: 0.29)
+* http://www.curlpp.org/[curlpp] (tested: 0.8)
+* Optional:
+** Manpage: http://asciidoc.org/[asciidoc] (tested: 8.6)
+
+===== Debian stretch
+
+[source,shellsession]
+----
+echo "APT::Default-Release \"stretch\";" >> /etc/apt/apt.conf.d/00default_release
+echo "deb http://deb.debian.org/debian sid main" >> /etc/apt/sources.list.d/sid.list
+apt-get update
+apt-get install build-essential cmake pkg-config libcurl4-openssl-dev asciidoc
+apt-get install -t sid libcurlpp-dev
+----
+////
+
+==== Get sourcecode
+
+////
+===== Releases
+
+Download the current release at
+https://schlomp.space/tastytea/remwharead/releases[schlomp.space].
+////
+
+===== Development version
+
+[source,shellsession]
+----
+git clone https://schlomp.space/tastytea/remwharead.git
+----
+
+==== Compile
+
+[source,shellsession]
+----
+mkdir build
+cd build/
+cmake ..
+cmake --build .
+----
+
+.cmake options:
+* `-DCMAKE_BUILD_TYPE=Debug` for a debug build.
+* `-DWITH_MAN=NO` to not compile the manpage.
+* `WITH_TESTS=YES` to compile the tests.
+
+You can run the tests with `ctest` inside the build directory. Install with
+`make install`.
+
+== Copyright
+
+----
+Copyright © 2019 tastytea <tastytea@tastytea.de>.
+License GPLv3: GNU GPL version 3 <https://www.gnu.org/licenses/gpl-3.0.html>.
+This program comes with ABSOLUTELY NO WARRANTY. This is free software,
+and you are welcome to redistribute it under certain conditions.
+----

build_manpage.sh

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+#!/bin/sh
+
+name="remwharead"
+
+if [ -n "${1}" ]; then
+    dir="$(dirname ${0})"
+    version=${1}
+    cp -vf "${dir}/${name}.1.adoc" .
+    sed -Ei "s/(Revision: +)[0-9]+\.[0-9]\.[0-9]/\1${version}/" "${name}.1.adoc"
+    a2x --doctype manpage --format manpage --no-xmllint "${name}.1.adoc"
+else
+    echo "usage: ${0} VERSION" >&2
+fi

remwharead.1.adoc

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+= remwharead(1)
+:doctype:       manpage
+:Author:        tastytea
+:Email:         tastytea@tastytea.de
+:Date:          2019-05-11
+:Revision:      0.0.0
+:man source:    remwharead
+:man version:   {revision}
+:man manual:    General Commands Manual
+
+== NAME
+
+remwharead - Remember what you read, and when
+
+== SYNOPSIS
+
+*remwharead*  [_url_|_--version_] [_arguments_]
+
+////
+== DESCRIPTION
+////
+
+== OPTIONS
+
+*--version*::
+Print version, copyright and license.
+
+////
+== EXAMPLES
+
+== FILES
+
+* *Configuration file*: `${XDG_CONFIG_HOME}/remwharead.cfg`
+
+`${XDG_CONFIG_HOME}` is usually `~/.config`.
+////
+
+== REPORTING BUGS
+
+Bugtracker: https://schlomp.space/tastytea/remwharead/issues
+
+E-mail: tastytea@tastytea.de

src/main.cpp

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+/*  This file is part of remwharead.
+ *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+int main()
+{
+    return 0;
+}

src/version.hpp.in

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+#ifndef VERSION_HPP
+#define VERSION_HPP
+
+namespace global
+{
+    static constexpr char version[] = "@PROJECT_VERSION@";
+}
+
+#endif // VERSION_HPP

tests.CMakeLists.txt

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+include(CTest)
+file(GLOB sources_tests tests/test_*.cpp)
+
+find_package(Catch2)
+if(Catch2_FOUND)    # Catch 2.x
+  include(Catch)
+  add_executable(all_tests tests/main.cpp ${sources_tests})
+  target_link_libraries(all_tests Catch2::Catch2 ${PROJECT_NAME}_testlib)
+  target_include_directories(all_tests PRIVATE "/usr/include/catch2")
+  catch_discover_tests(all_tests EXTRA_ARGS "${EXTRA_TEST_ARGS}")
+else()              # Catch 1.x
+  if(EXISTS "/usr/include/catch.hpp")
+    message(STATUS "Catch 1.x found.")
+    foreach(src ${sources_tests})
+      get_filename_component(bin ${src} NAME_WE)
+      add_executable(${bin} tests/main.cpp ${src})
+      target_link_libraries(${bin} ${PROJECT_NAME}_testlib)
+      add_test(${bin} ${bin} "${EXTRA_TEST_ARGS}")
+    endforeach()
+  else()
+    message(FATAL_ERROR
+      "Neither Catch 2.x nor Catch 1.x could be found.")
+  endif()
+endif()

tests/main.cpp

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+/*  This file is part of remwharead.
+ *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define CATCH_CONFIG_MAIN
+
+#include <catch.hpp>