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mastodon-cpp/examples/example03_mastocron.cpp
2018-04-19 00:36:39 +02:00

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/* This file is part of mastodon-cpp.
* Prints the new toots under a hashtag, designed to be used in cronjobs
*/
#include <iostream>
#include <vector>
#include <string>
#include <cstdint>
#include <regex>
#include <cstdlib>
#include <fstream>
#include <sstream>
#include <jsoncpp/json/json.h>
#ifdef MASTODON_CPP
#include "mastodon-cpp.hpp"
#else
#include <mastodon-cpp/mastodon-cpp.hpp>
#endif
using Mastodon::API;
using std::cout;
using std::string;
int main(int argc, char *argv[])
{
string limit = "20";
if (argc < 3)
{
std::cerr << "usage: " << argv[0] << " <instance> <hashtag> [limit]\n";
std::cerr << " Default limit is 20, max limit is 40.\n";
return 1;
}
else if (argc == 4)
{
limit = argv[3];
}
Mastodon::API masto(argv[1], "");
string hashtag = argv[2];
string answer;
std::stringstream ss;
std::uint16_t ret;
Json::Value config;
string lastid = "0";
string filename = string(getenv("HOME")) + "/.config/mastocron.json";
// Read config file, get last seen toot-id
try {
std::ifstream file(filename, std::ifstream::binary);
file >> config;
lastid = config.get(hashtag, "0").asString();
}
catch (std::exception &e)
{
// most likely no config file found, ignore
}
// Only get toots we haven't seen yet
API::parametermap params =
{
{ "hashtag", { hashtag } },
{ "limit", { limit } },
{ "since_id", { lastid } }
};
ret = masto.get(API::v1::timelines_tag_hashtag, params, answer);
if (ret == 0)
{
// If answer is empty, there are no new toots,
// if answer is "[]" there are none at all
if (answer != "" && answer != "[]")
{
string ornament = " +++++";
for (std::uint8_t i = hashtag.size(); i > 0; --i)
{
ornament += "+";
}
cout << ornament << '\n';
cout << " + " << hashtag << ": +\n";
cout << ornament << '\n';
Json::Value tree;
ss.str(answer);
ss >> tree;
for (const auto &toot : tree)
{
string content = toot["content"].asString();
std::regex reparagraph("</p><p>");
std::regex restrip("<[^>]*>");
cout << "++++++++\n";
content = std::regex_replace(content, reparagraph, "\n\n");
cout << std::regex_replace(content, restrip, "") << '\n';
cout << " ";
cout << toot["account"]["display_name"].asString()
<< " (" << toot["account"]["acct"] << ") at "
<< toot["created_at"].asString() << "\n";
cout << " " << toot["url"].asString() << '\n';
for (const auto &media : toot["media_attachments"])
{
cout << "Attachment: <" << media["url"].asString() << ">\n";
}
cout << "++++++++\n";
}
// Write the id of the newest toot in the config file
lastid = tree[0]["id"].asString();
config[hashtag] = lastid;
Json::StreamWriterBuilder wbuilder;
const string output = Json::writeString(wbuilder, config);
std::ofstream outfile(filename);
if (outfile.is_open())
{
outfile.write(output.c_str(), output.length());
outfile.close();
}
}
}
else if (ret == 13)
{
std::cerr << "The URL has permanently changed.\n" <<
"New URL: " << answer << '\n';
return ret;
}
else
{
std::cerr << "Error code: " << ret << '\n';
return ret;
}
return 0;
}