update(conventions): extend windows conventions to show more capability.

include/conventions/base_convention.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <string>
+#include <algorithm>
 #include <utility>
 
 #ifndef BASE_CONVENTION_HPP
@@ -31,4 +32,18 @@ namespace argument_parser::conventions {
     using convention = base_convention; 
 }
 
+namespace argument_parser::conventions::helpers {
+    static std::string to_lower(std::string s) {
+        std::transform(s.begin(), s.end(), s.begin(),
+            [](unsigned char c) { return std::tolower(c); });
+        return s;
+    }
+
+    static std::string to_upper(std::string s) {
+        std::transform(s.begin(), s.end(), s.begin(),
+            [](unsigned char c) { return std::toupper(c); });
+        return s;
+    }
+}
+
 #endif

include/conventions/implementations/windows_argument_convention.hpp

@@ -5,87 +5,116 @@
 #ifndef WINDOWS_ARGUMENT_CONVENTION_HPP
 #define WINDOWS_ARGUMENT_CONVENTION_HPP
 
+#ifndef ALLOW_DASH_FOR_WINDOWS
+#define ALLOW_DASH_FOR_WINDOWS 1
+#endif
+
 namespace argument_parser::conventions::implementations {
     class windows_argument_convention : public base_convention {
     public:
-		// Windows style options are prefixed with a slash ('/'). And there's no difference for short vs long options.
+        explicit windows_argument_convention(bool accept_dash = true)
+            : accept_dash_(accept_dash) {
+        }
+
         parsed_argument get_argument(std::string const& raw) const override {
-            if (raw.starts_with(long_prec()))
+            if (raw.empty()) {
-                return { argument_type::INTERCHANGABLE, raw.substr(1) };
+                return { argument_type::ERROR, "Empty argument token." };
-            else
+            }
-                return { argument_type::ERROR, "Windows standard requires non-positional arguments with a preceeding slash ('\\')." };
+            const char c0 = raw[0];
+            const bool ok_prefix = (c0 == '/') || (accept_dash_ && c0 == '-');
+            if (!ok_prefix) {
+                return { argument_type::ERROR,
+                    accept_dash_
+                        ? "Windows-style expects options to start with '/' (or '-' in compat mode)."
+                        : "Windows-style expects options to start with '/'." };
+            }
+
+            if (raw.find_first_of("=:") != std::string::npos) {
+                return { argument_type::ERROR,
+                         "Inline values are not allowed in this convention; provide the value in the next token." };
+            }
+
+            std::string name = helpers::to_lower(raw.substr(1));
+            if (name.empty()) {
+                return { argument_type::ERROR, "Option name cannot be empty after '/'." };
+            }
+
+            return { argument_type::INTERCHANGABLE, std::move(name) };
         }
 
         std::string extract_value(std::string const& /*raw*/) const override {
-            // In non-equal GNU, value comes in next token
+            throw std::runtime_error("No inline value; value must be provided in the next token.");
-            throw std::runtime_error("No inline value in standard GNU convention.");
         }
 
-        bool requires_next_token() const override {
+        bool requires_next_token() const override { return true; }
-            return true;
-        }
 
-        std::string name() const override {
+        std::string name() const override { return "Windows style options (next-token values)"; }
-            return "Windows style options";
+        std::string short_prec() const override { return accept_dash_ ? "-" : "/"; }
-        }
+        std::string long_prec()  const override { return "/"; }
-
-        std::string short_prec() const override {
-            return "/";
-        }
-
-        std::string long_prec() const override {
-            return "/";
-        }
 
         static windows_argument_convention instance; 
     private:
-        windows_argument_convention() = default;
+        bool accept_dash_;
     };
 
-    class windows_equal_argument_convention : public base_convention {
+    class windows_kv_argument_convention : public base_convention {
     public:
-        // Windows style options are prefixed with a slash ('/'). And there's no difference for short vs long options.
+        explicit windows_kv_argument_convention(bool accept_dash = true)
+            : accept_dash_(accept_dash) {
+        }
+
         parsed_argument get_argument(std::string const& raw) const override {
-            auto pos = raw.find('=');
+            if (raw.empty()) {
-            auto arg = pos != std::string::npos ? raw.substr(0, pos) : raw;
+                return { argument_type::ERROR, "Empty argument token." };
-            if (arg.starts_with(long_prec()))
+            }
-                return { argument_type::INTERCHANGABLE, arg.substr(1) };
+            const char c0 = raw[0];
-            else
+            const bool ok_prefix = (c0 == '/') || (accept_dash_ && c0 == '-');
-                return { argument_type::ERROR, "Windows standard requires non-positional arguments with a preceeding slash ('\\')." };
+            if (!ok_prefix) {
+                return { argument_type::ERROR,
+                    accept_dash_
+                        ? "Windows-style expects options to start with '/' (or '-' in compat mode)."
+                        : "Windows-style expects options to start with '/'." };
+            }
+
+            const std::size_t sep = raw.find_first_of("=:");
+            if (sep == std::string::npos) {
+                return { argument_type::ERROR,
+                         "Expected an inline value using '=' or ':' (e.g., /opt=value or /opt:value)." };
+            }
+            if (sep == 1) { 
+                return { argument_type::ERROR, "Option name cannot be empty before '=' or ':'." };
+            }
+
+            std::string name = helpers::to_lower(raw.substr(1, sep - 1));
+            return { argument_type::INTERCHANGABLE, std::move(name) };
         }
 
         std::string extract_value(std::string const& raw) const override {
-            auto pos = raw.find('=');
+            const std::size_t sep = raw.find_first_of("=:");
-            if (pos == std::string::npos || pos + 1 >= raw.size())
+            if (sep == std::string::npos || sep + 1 >= raw.size())
-                throw std::runtime_error("Expected value after '='.");
+                throw std::runtime_error("Expected a value after '=' or ':'.");
-            return raw.substr(pos + 1);
+            return raw.substr(sep + 1);
         }
 
-        bool requires_next_token() const override {
+        bool requires_next_token() const override { return false; }
-            return false;
-        }
 
-        std::string name() const override {
+        std::string name() const override { return "Windows style options (inline values via '=' or ':')"; }
-            return "Windows style options (equal signed form)";
+        std::string short_prec() const override { return accept_dash_ ? "-" : "/"; }
-        }
+        std::string long_prec()  const override { return "/"; }
 
-        std::string short_prec() const override {
+        static windows_kv_argument_convention instance;
-            return "/";
-        }
-
-        std::string long_prec() const override {
-            return "/";
-        }
-
-        static windows_equal_argument_convention instance;
     private:
-        windows_equal_argument_convention() = default;
+        bool accept_dash_;
     };
+
+
+	inline windows_argument_convention windows_argument_convention::instance = windows_argument_convention(bool(ALLOW_DASH_FOR_WINDOWS));
+	inline windows_kv_argument_convention windows_kv_argument_convention::instance = windows_kv_argument_convention(bool(ALLOW_DASH_FOR_WINDOWS));
 }
 
 namespace argument_parser::conventions {
     static inline const implementations::windows_argument_convention windows_argument_convention = implementations::windows_argument_convention::instance;
-	static inline const implementations::windows_equal_argument_convention windows_equal_argument_convention = implementations::windows_equal_argument_convention::instance;
+	static inline const implementations::windows_kv_argument_convention windows_equal_argument_convention = implementations::windows_kv_argument_convention::instance;
 }
 
 #endif // WINDOWS_ARGUMENT_CONVENTION_HPP

src/main.cpp

@@ -1,3 +1,5 @@
+#define ALLOW_DASH_FOR_WINDOWS 0
+
 #include <argparse>
 #include <cstdlib>
 #include <iostream>