implement quiet mode and detailed image load diagnostics

- Add -q/--quiet flag to suppress terminal logs and swatches
- Use stbi_failure_reason() to print detailed decode errors
- Update JSON image path resolution to handle CLI flags correctly

main.cpp

@@ -24,30 +24,38 @@ struct Bucket {
 };
 
 int main(int argc, char *argv[]) {
-    for (int i = 0; i <= argc - 1; i++) {
+    bool quiet = false;
+    std::string imagefile;
+    for (int i = 1; i < argc; i++) {
         std::string arg = argv[i];
         if (arg == "--help" || arg == "-h") {
             cout << 
                 "ccolors - extract color palette from images\n\n"
                 "Usage:\n"
-                "  " << argv[0] << " <image>\n\n"
+                "  " << argv[0] << " <image> [options]\n\n"
                 "Options:\n"
-                "  -h, --help     Show this help page\n\n"
+                "  -h, --help      Show this help page\n"
+                "  -q, --quiet     Suppress terminal output (JSON is still written)\n\n"
                 "Output:\n"
                 "  Prints dominant colors as HEX and terminal swatches\n"
                 "  Also writes palette.json\n";
             return 0;
+        } else if (arg == "--quiet" || arg == "-q") {
+            quiet = true;
+        } else if (imagefile.empty()) {
+            imagefile = arg;
+        } else {
+            cout << "Unknown argument: " << arg << "\n";
+            return 1;
         }
     }
 
-    if (argc != 2) {
+    if (imagefile.empty()) {
         cout << "Please specify a image file. " << argv[0] << " imagefile.jpg"
              << "\nTry \"" << argv[0] << " --help\" for more information.";
         return 1;
     }
 
-    std::string imagefile = argv[1];
-
     if (!fs::is_regular_file(imagefile)) {
         std::cout << "File not found: " << imagefile << "\n";
         return 1;
@@ -70,9 +78,9 @@ int main(int argc, char *argv[]) {
     const unsigned char* header = buffer.data();
 
     if (is_png(header)) {
-        cout << "PNG file detected!\n";
+        if (!quiet) cout << "PNG file detected!\n";
     } else if (is_jpeg(header)) {
-        cout << "JPEG file detected!\n";
+        if (!quiet) cout << "JPEG file detected!\n";
     } else {
         cout << "Unknown image file format!\n";
         return 1;
@@ -90,17 +98,24 @@ int main(int argc, char *argv[]) {
         );
 
     if (!data) {
-        cout << "Failed to load image!\n";
+        const char* reason = stbi_failure_reason();
+        cout << "Failed to load image";
+        if (reason != nullptr) {
+            cout << ": " << reason;
+        }
+        cout << "\n";
         return 1;
     }
 
 
+    if (!quiet) {
         cout << "**********\n";
         cout << "Loaded image:\n";
         cout << "Width: " << width << "\n";
         cout << "Height: " << height << "\n";
         cout << "Channels: " << channels << "\n";
         cout << "**********\n";
+    }
 
     std::unordered_map<int, Bucket> hist;
 
@@ -137,7 +152,7 @@ int main(int argc, char *argv[]) {
         }
     }
 
-    cout << "Sampled pixels: " << sampled << "\n";
+    if (!quiet) cout << "Sampled pixels: " << sampled << "\n";
 
     std::vector<Bucket> buckets;
 
@@ -155,7 +170,7 @@ int main(int argc, char *argv[]) {
     std::ofstream json("palette.json");
 
     json << "{\n";
-    json << "   \"image\": \"" << argv[1] << "\",\n";
+    json << "   \"image\": \"" << imagefile << "\",\n";
     json << "   \"palette\": [\n";
 
     for (int i = 0; i < paletteSize; i++) {
@@ -164,9 +179,11 @@ int main(int argc, char *argv[]) {
         int g = b.g / b.count;
         int bcol = b.b / b.count;
 
+        if (!quiet) {
             printf("\033[48;2;%d;%d;%dm  \033[0m #%02X%02X%02X\n",
             r, g, bcol,
             r, g, bcol);
+        }
 
         json << "   { "
              << "\"r\": " << r << ", "