Rework option parsing a bit.

- Add --basic-regexp
- Add --grep
- Remove --input-file
- Make it possible to have multiple --regexp

src/main.cpp

@@ -70,6 +70,14 @@ int main(int argc, char *argv[])
     cout << "perl-regexp: " << vm.count("perl-regexp") << '\n';
     cout << "ignore-case: " << vm.count("ignore-case") << '\n';
 
+    if (vm.count("regexp") > 0)
+    {
+        for (const auto &regex : vm["regexp"].as<std::vector<std::string>>())
+        {
+            cout << "Searching for: " << regex << '\n';
+        }
+    }
+
     if (vm.count("input-file") > 0)
     {
         cout << "\nINPUT FILES:\n";

src/options.cpp

@@ -41,40 +41,52 @@ using std::cout;
 
 po::variables_map parse_options(int argc, char *argv[])
 {
-    po::options_description cmdline_desc(translate("Available options"));
+    po::options_description options_visible(translate("Available options"));
     // clang-format off
-    cmdline_desc.add_options()
+    options_visible.add_options()
         ("help,h",
          translate("Display this help and exit.").str().data())
         ("version,V",
          translate("Display version information and exit.").str().data())
+        ("basic-regexp,G",
+         translate("PATTERN is a basic regular expression (default).")
+         .str().data())
         ("extended-regexp,E",
-         translate("PATTERN is extended regular expression.").str().data())
+         translate("PATTERN is an extended regular expression.").str().data())
+        ("grep",
+         translate("Use grep-variation of regular expressions with -G and -E.")
+         .str().data())
         ("perl-regexp,P",
-         translate("PATTERN is Perl regular expression.").str().data())
+         translate("PATTERN is a Perl regular expression.").str().data())
         ("ignore-case,i",
          translate("Ignore case distinctions in pattern and data.")
          .str().data())
-        ("regexp,e", po::value<std::string>()->value_name(translate("PATTERN")),
-         translate("Use PATTERN for matching.").str().data())
-        ("input-file,I", po::value<std::vector<std::string>>()
-         ->value_name(translate("FILE")),
-         translate("Input file. Can be used more than once.").str().data())
+        ("regexp,e", po::value<std::vector<std::string>>()->composing()
+         ->value_name(translate("PATTERN")),
+         translate("Use additional PATTERN for matching.").str().data())
+    ;
+
+    po::options_description options_hidden("Hidden options");
+    options_hidden.add_options()
+        ("input-file", po::value<std::vector<std::string>>()
+         ->value_name("FILE"), "Input file to search.")
         ;
     // clang-format on
+    po::options_description options_all("Allowed options");
+    options_all.add(options_visible).add(options_hidden);
 
     po::positional_options_description positional_desc;
     positional_desc.add("regexp", 1).add("input-file", -1);
 
     po::variables_map vm;
     po::store(po::command_line_parser(argc, argv)
-                  .options(cmdline_desc)
+                  .options(options_all)
                   .positional(positional_desc)
                   .run(),
               vm);
 
     std::ifstream configfile(get_config_path());
-    po::store(po::parse_config_file(configfile, cmdline_desc, true), vm);
+    po::store(po::parse_config_file(configfile, options_visible, true), vm);
     configfile.close();
 
     po::notify(vm);
@@ -82,7 +94,7 @@ po::variables_map parse_options(int argc, char *argv[])
     if (vm.count("help") != 0)
     {
         cout << translate("Usage: epubgrep [OPTION]… PATTERN [FILE]…\n");
-        cout << cmdline_desc;
+        cout << options_visible;
     }
     else if (vm.count("version") != 0)
     {