Handle empty directory and invalid image extension

src/Wallpapers.cpp

@@ -2,14 +2,20 @@
 #include <algorithm>
 #include <filesystem>
 #include <iostream>
+#include <ostream>
+#include <stdexcept>
 
 Wallpapers::Wallpapers(const std::string& directoryPath) : directoryPath(directoryPath) {
 
 	for (const auto& entry : std::filesystem::directory_iterator(directoryPath)) {
+		if (!isValidPath(entry.path())) {
+			continue;
+		}
 		wallpapersPath.push_back(entry.path());
 	}
-	for (const std::string& wallpaperPath : wallpapersPath) {
-		std::cout << wallpaperPath << std::endl;
+	if (wallpapersPath.size() == 0) {
+		throw std::runtime_error("Directory '" + directoryPath + "' doesn't contain any valid wallapers\n\
+Allowed extension are .png, .jpg, .jpeg");
 	}
 	e1 = std::default_random_engine(r());
 	uniformDist = std::uniform_int_distribution<int>(0, wallpapersPath.size());
@@ -22,7 +28,21 @@ void Wallpapers::shuffle() {
 }
 
 const std::string& Wallpapers::next() {
+	if (wallpapersPathQueue.size() == 0) {
+		throw std::runtime_error("No valid wallpapers found when calling Wallpapers::next method");
+	}
 	const std::string& wallpaperPath = wallpapersPathQueue[currentWallpaperIndex];
 	currentWallpaperIndex = (currentWallpaperIndex + 1) % wallpapersPathQueue.size();
 	return wallpaperPath;
 }
+
+bool Wallpapers::isValidPath(const std::string& path) const {
+	static std::array validExtensions {"jpg", "jpeg", "png"};
+
+	for (const auto& extension : validExtensions) {
+		if (path.ends_with(extension)) {
+			return true;
+		}
+	}
+	return false;
+}

src/Wallpapers.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <array>
 #include <random>
 #include <string>
 #include <vector>
@@ -14,6 +15,8 @@ class Wallpapers {
 
 	private:
 
+	bool isValidPath(const std::string& path) const;
+
 	std::string directoryPath;
 	std::vector<std::string> wallpapersPath;
 	std::vector<std::string> wallpapersPathQueue;

src/main.cpp

@@ -1,12 +1,16 @@
 #include "CliArguments.h"
 #include "Wallpapers.h"
 #include "SwaybgProcess.h"
+#include <exception>
 #include <iostream>
 #include <ostream>
 #include <string>
 
 int main(int argc, char** argv, char** envp) {
 
+	try {
+		
+
 		CliArguments::CliArguments arguments{
 			argc, argv,
 			{
@@ -81,4 +85,8 @@ int main(int argc, char** argv, char** envp) {
 
 		swayBgProcess.kill();
 		return 0;
+	} catch (std::exception& e) {
+		std::cerr << e.what() << std::endl;
+		return 1;
+	}
 }