iZo/tests/directory_watcher.cpp

#include "test_support.hpp"

#include <izo/DirectoryWatcher.hpp>

#include <algorithm>
#include <fstream>
#include <mutex>
#include <vector>

int main() {
    std::string error;
    CHECK(!izo::WatchDirectory({"/izo/missing", false}, [](const auto&) {}, &error));
    CHECK(!error.empty());
    error.clear();

    const auto directory = test_directory("watcher");
    CHECK(!izo::WatchDirectory({directory, false}, {}, &error));
    CHECK(!error.empty());
    error.clear();
    CHECK(!izo::WatchDirectory({directory, false, std::chrono::milliseconds(0)},
                                [](const auto&) {}, &error));

    std::mutex mutex;
    std::vector<izo::FileEvent> events;
    auto watcher = izo::WatchDirectory(
        {directory, true, std::chrono::milliseconds(10)},
        [&](const izo::FileEvent& event) {
            std::lock_guard<std::mutex> lock(mutex);
            events.push_back(event);
        }, &error);
    CHECK(watcher);
    std::this_thread::sleep_for(std::chrono::milliseconds(50));

    const auto original = directory / "original.txt";
    const auto renamed = directory / "renamed.txt";
    { std::ofstream file(original); file << "a"; }
    CHECK(wait_until([&] {
        std::lock_guard<std::mutex> lock(mutex);
        return std::any_of(events.begin(), events.end(), [&](const auto& event) {
            return event.change == izo::FileChange::Added && event.path == original;
        });
    }));

    { std::ofstream file(original, std::ios::app); file << "more"; }
    CHECK(wait_until([&] {
        std::lock_guard<std::mutex> lock(mutex);
        return std::any_of(events.begin(), events.end(), [&](const auto& event) {
            return event.change == izo::FileChange::Modified && event.path == original;
        });
    }));

    std::filesystem::rename(original, renamed);
    CHECK(wait_until([&] {
        std::lock_guard<std::mutex> lock(mutex);
        return std::any_of(events.begin(), events.end(), [&](const auto& event) {
            return event.change == izo::FileChange::Renamed && event.path == renamed &&
                   event.previousPath == original;
        });
    }));

    std::filesystem::remove(renamed);
    CHECK(wait_until([&] {
        std::lock_guard<std::mutex> lock(mutex);
        return std::any_of(events.begin(), events.end(), [&](const auto& event) {
            return event.change == izo::FileChange::Removed && event.path == renamed;
        });
    }));
    watcher.Stop();
    CHECK(!watcher);
    std::filesystem::remove_all(directory);
}