initial commit

Makefile

@@ -0,0 +1,21 @@
+# compiler settings
+CXX = g++
+CXXFLAGS = -Wall -std=c++11
+
+# general variables
+TARGET = main
+SRC = main.cpp
+OBJ = $(SRC:.cpp=.o)
+
+# Default target
+all: $(TARGET)
+
+# compile
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $<
+
+# cleanup
+.PHONY: clean
+clean:
+	rm -f $(OBJ) $(TARGET)
+

main.cpp

@@ -0,0 +1,64 @@
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+
+// value of an environment variable
+const char *getEnvVar(const char *name) {
+  const char *value = std::getenv(name);
+  if (value == nullptr) {
+    throw std::runtime_error(std::string("Environment variable ") + name +
+                             " is not set.");
+  }
+
+  return value;
+}
+
+// print the value of an environment variable
+void printEnvVar(const char *name) {
+  const char *value = getEnvVar(name);
+  std::cout << name << "=" << value << std::endl;
+}
+
+// read the logs and return the lines that start with [ERR]
+// which are standard errors
+std::vector<std::string> readErrLines(const std::string &filePath) {
+  std::ifstream file(filePath);
+  if (!file.is_open()) {
+    throw std::runtime_error("Unable to open file at " + filePath);
+  }
+
+  std::string line;
+  std::vector<std::string> errLines;
+
+  while (std::getline(file, line)) {
+    if (line.substr(0, 5) == "[ERR]") {
+      errLines.push_back(line);
+    }
+  }
+
+  file.close();
+  return errLines;
+}
+
+int main() {
+  const char *envVar = getEnvVar("HYPRLAND_INSTANCE_SIGNATURE");
+  std::cout << "Variable HYPRLAND_INSTANCE_SIGNATURE is set to " << envVar
+            << std::endl;
+
+  try {
+    std::string filePath = "/tmp/hypr/" + std::string(envVar);
+    std::vector<std::string> errLines = readErrLines(filePath);
+
+    // print error lines
+    for (const auto &line : errLines) {
+      std::cout << line << std::endl;
+    }
+  } catch (const std::runtime_error &e) {
+    std::cerr << "Error: " << e.what() << std::endl;
+    return 1;
+  }
+
+  return 0;
+}