Adding css reloader

test/css_reload_helper.cpp

@@ -0,0 +1,188 @@
+#include "util/css_reload_helper.hpp"
+#include <map>
+#include <fstream>
+
+#if __has_include(<catch2/catch_test_macros.hpp>)
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/matchers/catch_matchers_all.hpp>
+#else
+#include <catch2/catch.hpp>
+#endif
+
+
+class CssReloadHelperTest : public waybar::CssReloadHelper
+{
+public:
+  CssReloadHelperTest()
+    : CssReloadHelper("/tmp/waybar_test.css", [this]() {callback();})
+  {
+  }
+
+  void callback()
+  {
+    m_callbackCounter++;
+  }
+
+protected:
+
+  std::string getFileContents(const std::string& filename) override
+  {
+    return m_fileContents[filename];
+  }
+
+  std::string findPath(const std::string& filename) override
+  {
+    return filename;
+  }
+
+  void setFileContents(const std::string& filename, const std::string& contents)
+  {
+    m_fileContents[filename] = contents;
+  }
+
+  int getCallbackCounter() const
+  {
+    return m_callbackCounter;
+  }
+
+private:
+  int m_callbackCounter{};
+  std::map<std::string, std::string> m_fileContents;
+};
+
+TEST_CASE_METHOD(CssReloadHelperTest, "parse_imports", "[util][css_reload_helper]")
+{
+  SECTION("no imports")
+  {
+    setFileContents("/tmp/waybar_test.css", "body { color: red; }");
+    auto files = parseImports("/tmp/waybar_test.css");
+    REQUIRE(files.size() == 1);
+    CHECK(files[0] == "/tmp/waybar_test.css");
+  }
+
+  SECTION("single import")
+  {
+    setFileContents("/tmp/waybar_test.css", "@import 'test.css';");
+    setFileContents("test.css", "body { color: red; }");
+    auto files = parseImports("/tmp/waybar_test.css");
+    std::sort(files.begin(), files.end());
+    REQUIRE(files.size() == 2);
+    CHECK(files[0] == "/tmp/waybar_test.css");
+    CHECK(files[1] == "test.css");
+  }
+
+  SECTION("multiple imports")
+  {
+    setFileContents("/tmp/waybar_test.css", "@import 'test.css'; @import 'test2.css';");
+    setFileContents("test.css", "body { color: red; }");
+    setFileContents("test2.css", "body { color: blue; }");
+    auto files = parseImports("/tmp/waybar_test.css");
+    std::sort(files.begin(), files.end());
+    REQUIRE(files.size() == 3);
+    CHECK(files[0] == "/tmp/waybar_test.css");
+    CHECK(files[1] == "test.css");
+    CHECK(files[2] == "test2.css");
+  }
+
+  SECTION("nested imports")
+  {
+    setFileContents("/tmp/waybar_test.css", "@import 'test.css';");
+    setFileContents("test.css", "@import 'test2.css';");
+    setFileContents("test2.css", "body { color: red; }");
+    auto files = parseImports("/tmp/waybar_test.css");
+    std::sort(files.begin(), files.end());
+    REQUIRE(files.size() == 3);
+    CHECK(files[0] == "/tmp/waybar_test.css");
+    CHECK(files[1] == "test.css");
+    CHECK(files[2] == "test2.css");
+  }
+
+  SECTION("circular imports")
+  {
+    setFileContents("/tmp/waybar_test.css", "@import 'test.css';");
+    setFileContents("test.css", "@import 'test2.css';");
+    setFileContents("test2.css", "@import 'test.css';");
+    auto files = parseImports("/tmp/waybar_test.css");
+    std::sort(files.begin(), files.end());
+    REQUIRE(files.size() == 3);
+    CHECK(files[0] == "/tmp/waybar_test.css");
+    CHECK(files[1] == "test.css");
+    CHECK(files[2] == "test2.css");
+  }
+
+  SECTION("empty")
+  {
+    setFileContents("/tmp/waybar_test.css", "");
+    auto files = parseImports("/tmp/waybar_test.css");
+    REQUIRE(files.size() == 1);
+    CHECK(files[0] == "/tmp/waybar_test.css");
+  }
+
+  SECTION("empty name")
+  {
+    auto files = parseImports("");
+    REQUIRE(files.empty());
+  }
+}
+
+TEST_CASE("file_watcher", "[util][css_reload_helper]")
+{
+  SECTION("file does not exist")
+  {
+    std::atomic<int> count;
+    std::string f1 = std::tmpnam(nullptr);
+    waybar::CssReloadHelper helper(f1, [&count](){++count;});
+    helper.monitorChanges();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    CHECK(count == 0);
+    helper.stop();
+    std::remove(f1.c_str());
+  }
+
+  SECTION("file exists")
+  {
+    std::atomic<int> count;
+    std::string f1 = std::tmpnam(nullptr);
+    std::ofstream(f1) << "body { color: red; }";
+    waybar::CssReloadHelper helper(f1, [&count](){++count;});
+    helper.monitorChanges();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    CHECK(count == 0);
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    std::ofstream(f1) << "body { color: blue; }";
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    CHECK(count == 1);
+    helper.stop();
+    std::remove(f1.c_str());
+  }
+
+  SECTION("multiple files")
+  {
+    std::atomic<int> count;
+    std::string f1 = std::tmpnam(nullptr);
+    std::string f2 = std::tmpnam(nullptr);
+    std::ofstream(f1) << ("@import '" + f2 + " ';");
+    std::ofstream(f2) << "body { color: red; }";
+    waybar::CssReloadHelper helper(f1, [&count](){++count;});
+    helper.monitorChanges();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    CHECK(count == 0);
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    std::ofstream(f2) << "body { color: blue; }";
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    CHECK(count == 1);
+    helper.stop();
+    std::remove(f1.c_str());
+    std::remove(f2.c_str());
+  }
+}