1 files changed, 83 insertions, 0 deletions
diff --git a/core/io/cmdline.cc b/core/io/cmdline.cc
new file mode 100644
index 0000000..c43727d
--- /dev/null
+++ b/core/io/cmdline.cc
@@ -0,0 +1,83 @@
+#include "core/pch.hh"
+
+#include "core/io/cmdline.hh"
+
+// Valid options always start with OPTION_PREFIX, can contain
+// a bunch of OPTION_PREFIX'es inside and never end with one
+constexpr static char OPTION_PREFIX = '-';
+
+static std::unordered_map<std::string, std::string> options;
+
+static inline bool is_option_string(const std::string& string)
+{
+    if(string.find_last_of(OPTION_PREFIX) >= (string.size() - 1)) {
+        return false;
+    }
+
+    return string[0] == OPTION_PREFIX;
+}
+
+static inline std::string get_option(const std::string& string)
+{
+    std::size_t i;
+    for(i = 0; string[i] == OPTION_PREFIX; ++i) {
+        // empty
+    }
+
+    return std::string(string.cbegin() + i, string.cend());
+}
+
+void io::cmdline::create(int argc, char** argv)
+{
+    for(int idx = 1; idx < argc; ++idx) {
+        std::string string = argv[idx];
+
+        if(!is_option_string(string)) {
+            spdlog::warn("cmdline: non-argument at {}: {}", idx, string);
+            continue;
+        }
+
+        auto option_string = get_option(string);
+        auto next_idx = idx + 1;
+
+        if(next_idx < argc) {
+            std::string argument = argv[next_idx];
+
+            if(!is_option_string(argument)) {
+                options.insert_or_assign(option_string, argument);
+                idx = next_idx;
+                continue;
+            }
+        }
+
+        // The option is either last or has no
+        // argument (happens when there is a valid
+        // option right next to the one we're parsing)
+        options.insert_or_assign(option_string, std::string());
+    }
+}
+
+void io::cmdline::insert(const char* option, const char* argument)
+{
+    if(argument == nullptr) {
+        options.insert_or_assign(option, std::string());
+    } else {
+        options.insert_or_assign(option, argument);
+    }
+}
+
+const char* io::cmdline::get(const char* option, const char* fallback)
+{
+    auto it = options.find(option);
+
+    if(it == options.cend()) {
+        return fallback;
+    }
+
+    return it->second.c_str();
+}
+
+bool io::cmdline::contains(const char* option)
+{
+    return options.count(option);
+}