zimwriterfs: Added checks for description and longDescription length,…

… added new option --longDescription

made the --description option mandatory (its value cannot be empty)

checking that the lengths of the short and long descriptions are below
their respective limits (80 and 4000)

the long description is optional; however, if provided, it must not be
shorter than the short description

src/zimwriterfs/zimwriterfs.cpp

@@ -49,6 +49,7 @@ std::string scraper = "zimwriterfs-" VERSION;
 std::string name;
 std::string source;
 std::string description;
+std::string longDescription;
 std::string welcome;
 std::string illustration;
 std::string redirectsPath;
@@ -80,6 +81,28 @@ bool thereAreMissingArguments()
       || illustration.empty();
 }
 
+bool checkDescriptionLengths() {
+  if (description.empty()) {
+    std::cerr << "Description metadata should not be empty." << std::endl;
+    return false;
+  }
+
+  if (!longDescription.empty() && longDescription.length() < description.length()) {
+    std::cerr << "Long description should not be shorter than the short description." << std::endl;
+    return false;
+  }
+
+  if (description.length() > 80) {
+    std::cerr << "Description length exceeds the 80 character limit." << std::endl;
+    return false;
+  }
+
+  if (!longDescription.empty() && longDescription.length() > 4000) {
+    std::cerr << "Long description length exceeds the 4000 character limit." << std::endl;
+    return false;
+  }
+
+  return true;
 }
 
 // Global flags
@@ -123,6 +146,8 @@ void usage()
   std::cout << "\t-t, --title\t\ttitle of the ZIM file" << std::endl;
   std::cout << "\t-d, --description\tshort description of the content"
             << std::endl;
+  std::cout << "\t-L, --longDescription\tlong description of the content"
+            << std::endl;
   std::cout << "\t-c, --creator\t\tcreator(s) of the content" << std::endl;
   std::cout << "\t-p, --publisher\t\tcreator of the ZIM file itself"
             << std::endl;
@@ -189,6 +214,7 @@ void parse_args(int argc, char** argv)
       = {{"help", no_argument, 0, 'h'},
          {"verbose", no_argument, 0, 'v'},
          {"version", no_argument, 0, 'V'},
+         {"longDescription", required_argument, 0, 'L'},
          {"welcome", required_argument, 0, 'w'},
          {"clusterSize", required_argument, 0, 'm'},
          {"name", required_argument, 0, 'n'},
@@ -260,6 +286,9 @@ void parse_args(int argc, char** argv)
         case 'm':
           clusterSize = atoi(optarg);
           break;
+        case 'L':
+          longDescription = optarg;
+          break;
         case 'n':
           name = optarg;
           break;
@@ -297,6 +326,11 @@ void parse_args(int argc, char** argv)
     }
   } while (c != -1);
 
+  if ( !checkDescriptionLengths() ) {
+    exit(1);
+  }
+
+
   while (optind < argc) {
     if (directoryPath.empty()) {
       directoryPath = argv[optind++];