Expanding URLs on the commandline works

.gitignore

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+/build/

CMakeLists.txt

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+cmake_minimum_required (VERSION 3.7)
+project (expandurl-mastodon
+         VERSION 0.0.0
+         LANGUAGES CXX
+)
+
+include(GNUInstallDirs)
+include(FindCURL)
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+include_directories(${PROJECT_SOURCE_DIR}/src)
+include_directories(${PROJECT_BINARY_DIR})
+
+# Write version in header
+configure_file (
+    "${PROJECT_SOURCE_DIR}/src/version.hpp.in"
+    "${PROJECT_BINARY_DIR}/version.hpp"
+)
+
+find_package(CURL REQUIRED)
+include_directories(${CURL_INCLUDE_DIR})
+
+file(GLOB sources src/*.cpp)
+add_executable(expandurl-mastodon ${sources})
+target_link_libraries(expandurl-mastodon mastodon-cpp curl curlpp)
+install(TARGETS expandurl-mastodon DESTINATION ${CMAKE_INSTALL_BINDIR})

README.md

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+**expandurl-mastodon** is a Mastodon bot that expands a shortened URL.
+
+
+# Install
+
+## Dependencies
+
+ * Tested OS: Linux
+ * C++ compiler (tested: gcc 6.4, clang 5.0)
+ * [cmake](https://cmake.org/) (tested: 3.9.6)
+ * [curlpp](http://www.curlpp.org/) (tested: 0.8.4)
+ * [mastodon-cpp](https://github.com/tastytea/mastodon-cpp) (at least: 0.12.0)
+
+## Get sourcecode
+
+### Development version
+
+    git clone https://github.com/tastytea/expandurl-mastodon.git
+
+## Compile
+
+    mkdir build
+    cd build/
+    cmake ..
+    make
+
+Install with `make install`.
+
+# Usage
+
+## Error codes
+
+Same as [mastodon-cpp](https://github.com/tastytea/mastodon-cpp/blob/master/README.md#error-codes)
+
+# Copyright
+
+    Copyright © 2018 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.

src/expand.cpp

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+/*  This file is part of expandurl-mastodon.
+ *  Copyright © 2018 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/>.
+ */
+
+#include <iostream>
+#include <string>
+#include <curlpp/cURLpp.hpp>
+#include <curlpp/Options.hpp>
+#include <curlpp/Infos.hpp>
+#include "version.hpp"
+#include "expandurl-mastodon.hpp"
+
+using std::cerr;
+using std::string;
+namespace curlopts = curlpp::options;
+
+const string expand(const string &url)
+{
+    curlpp::Easy request;
+
+    request.setOpt<curlopts::CustomRequest>("HEAD");
+    request.setOpt<curlopts::Url>(url);
+    request.setOpt<curlopts::UserAgent>
+        (static_cast<const string>("expandurl-mastodon/") + global::version);
+    request.setOpt<curlopts::HttpHeader>(
+    {
+        "Connection: close",
+    });
+    request.setOpt<curlopts::FollowLocation>(true);
+
+    try
+    {
+        request.perform();
+    }
+    catch (const std::exception &e)
+    {
+        cerr << "ERROR: " << e.what() << '\n';
+        cerr << "The previous error is ignored.\n";
+    }
+
+    return curlpp::infos::EffectiveUrl::get(request);
+}

src/expandurl-mastodon.hpp

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+/*  This file is part of expandurl-mastodon.
+ *  Copyright © 2018 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/>.
+ */
+
+#ifndef EXPANDURL_MASTODON_HPP
+#define EXPANDURL_MASTODON_HPP
+
+#include <string>
+
+using std::string;
+
+const string expand(const string &url);
+
+#endif  // EXPANDURL_MASTODON_HPP

src/main.cpp

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+/*  This file is part of expandurl-mastodon.
+ *  Copyright © 2018 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/>.
+ */
+
+#include <iostream>
+#include <string>
+#include <curlpp/cURLpp.hpp>
+#include "expandurl-mastodon.hpp"
+
+using std::cout;
+using std::string;
+
+int main(int argc, char *argv[])
+{
+    curlpp::initialize();
+
+    cout << expand(argv[1]) << '\n';
+
+    curlpp::Cleanup();
+
+    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