From 34d5de3593931cca828d82d3aa5ea38d023d7772 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Sun, 23 Aug 2020 22:22:20 +0200
Subject: added a (semi) reflexive help command

---
 src/main.cpp | 51 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 44 insertions(+), 7 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index c704f39..42a642a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -11,19 +11,22 @@
 #define NO_SUCH_COMMAND std::string("no_such_command")
 
 typedef crow::json::wvalue json;
-typedef std::function<json(std::string const &arguments, std::string const &session, void *payload)> handler_func;
+typedef std::function<json(std::string const &arguments, std::string const &session, void *payload)> handler_function;
 
 struct CommandHandler {
     [[nodiscard]] json exec(std::string const &arguments, std::string const &session) const {
         return func(arguments, session, payload);
     }
 
-    handler_func func;
+    handler_function func{nullptr};
+    std::string description{""};
     void *payload{nullptr};
 };
 
 /* ------------------------------------------------------------------------------------------------------------------ */
 
+json helpHandler(std::string const &arguments, std::string const &session, void *payload);
+
 json stopHandler(std::string const &arguments, std::string const &session, void *payload);
 
 json wikiHandler(std::string const &arguments, std::string const &session, void *payload);
@@ -38,6 +41,7 @@ json create_annotation(Reply::AnnotationType annotation = Reply::AnnotationType:
                        std::string const &extra = EMPTY_STRING);
 
 json create_text(std::string const &text);
+
 json create_text(std::string const &text, std::vector<json> &&annotations);
 
 json create_response(std::vector<json> &&reply, std::string const &session = NULL_STRING, bool success = true);
@@ -48,15 +52,18 @@ int main() {
     crow::SimpleApp app;
 
     // command --> handler
-    static std::unordered_map<std::string, CommandHandler> const commands{
-            {"stop",    {stopHandler, &app}},
-            {"wiki",    {wikiHandler}},
-            {"klinger", {klingerHandler}},
+    std::unordered_map<std::string, CommandHandler> commands{
+            {"stop",    {.func = stopHandler, .description = "Stops the bot", .payload = &app}},
+            {"wiki",    {.func = wikiHandler, .description = "Send you to wikipedia"}},
+            {"klinger", {.func = klingerHandler, .description = "Greats in french. Bonjour!"}},
     };
 
+    commands.insert({"help",
+                     {.func = helpHandler, .description = "This is my holy manual.", .payload = &commands}});
+
     CROW_ROUTE(app, "/")
             .methods("POST"_method)
-                    ([&app](crow::request const &request) {
+                    ([&commands](crow::request const &request) {
                         auto data = crow::json::load(request.body);
 
                         if (!data)
@@ -104,6 +111,36 @@ json wikiHandler(std::string const &arguments, std::string const &session, void
     return create_response(std::move(reply_vec), session, true);
 }
 
+json helpHandler(std::string const &arguments, std::string const &session, void *payload) {
+    auto commands = *(std::unordered_map<std::string, CommandHandler> *) payload;
+
+    std::vector<json> reply_vec;
+    reply_vec.push_back(std::move(create_text(
+            "Reading from the gospel according to saint N,\n"
+            "And you shall feast upon the animals intestines as I do in the offering for they will make you strong.\n"
+            "\n"
+            "Dear my fellow users, these are my official commands, which are offered to my believers.\n"
+            "\n")));
+
+    for (auto const &itor : commands) {
+        std::vector<json> commandAnnotations;
+        commandAnnotations.push_back(std::move(create_annotation(Reply::AnnotationType::italics)));
+        commandAnnotations.push_back(std::move(create_annotation(Reply::AnnotationType::underline)));
+
+        reply_vec.push_back(std::move(create_text("- ")));
+        reply_vec.push_back(std::move(create_text(itor.first, std::move(commandAnnotations))));
+        reply_vec.push_back(std::move(create_text(" " + itor.second.description + "\n")));
+    }
+
+    reply_vec.push_back(std::move(create_text(
+            "\n"
+            "Thanks for using me. Takk skal du ha.\n"
+            "Bussy\n"
+            "N")));
+
+    return create_response(std::move(reply_vec), session, true);
+}
+
 json stopHandler(std::string const &arguments, std::string const &session, void *payload) {
     auto app = (crow::SimpleApp *) payload;
     app->stop();
-- 
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