add history and command completion to readline

cli_interface.cpp

@@ -1,5 +1,6 @@
 #include <cstdio>
 #include <readline/readline.h>
+#include <readline/history.h>
 #include <iostream>
 #include <memory>
 #include <cmath>
@@ -28,6 +29,37 @@ namespace Hanabi {
         return ret;
     }
 
+    constexpr static std::array<std::string, 10> cli_commands = {
+            "play",
+            "clue",
+            "discard",
+            "id",
+            "state",
+            "revert",
+            "actions",
+            "evaluate",
+            "help",
+            "quit",
+    };
+
+    char * cli_commands_generator(const char *text, int state) {
+        std::string text_str (text);
+        for(auto& command : cli_commands) {
+            if (command.starts_with(text_str) && state-- <= 0) {
+                return strdup(command.c_str());
+            }
+        }
+        return nullptr;
+    }
+
+    char **
+    cli_command_completion(const char *text, int start, int end)
+    {
+        rl_attempted_completion_over = 1;
+        return rl_completion_matches(text, cli_commands_generator);
+    }
+
+
     Card parse_card(std::string card_str) {
         if (card_str == "trash") {
             return Cards::trash;
@@ -56,16 +88,18 @@ namespace Hanabi {
         }
         std::cout << "Choose drawn card: " << std::endl;
         unsigned num_trash = 0;
+        std::optional<probability_t> trash_discard_prob = 0;
         for(const auto &[card_multiplicity, probability]: next_states) {
             if (game->is_trash(card_multiplicity.card)) {
                 num_trash += card_multiplicity.multiplicity;
+                trash_discard_prob = probability;
             } else {
                 std::cout << card_multiplicity.card << " (" << card_multiplicity.multiplicity;
                 std::cout << " copie(s) in draw) " << probability << std::endl;
             }
         }
         if (num_trash > 0) {
-            std::cout << Cards::trash << " (" << num_trash << " copie(s) in draw" << std::endl;
+            std::cout << Cards::trash << " (" << num_trash << " copie(s) in draw) " << trash_discard_prob << std::endl;
         }
 
         std::stringstream prompt;
@@ -103,22 +137,33 @@ namespace Hanabi {
         return true;
     }
 
-    [[noreturn]] void cli(const std::shared_ptr<HanabiStateIF>& game) {
+    void cli(const std::shared_ptr<HanabiStateIF>& game) {
+        rl_attempted_completion_function = cli_command_completion;
+        using_history();
+        unsigned depth = 0;
         while (true) {
             const std::string prompt = read_line_memory_safe("> ");
+            add_history(prompt.c_str());
 
             if (prompt.starts_with("help")) {
-                std::cout << "state: print information on current game state." << std::endl;
+                std::cout << "state:       print information on current game state." << std::endl;
-                std::cout << "clue: give a clue." << std::endl;
+                std::cout << "clue:        give a clue." << std::endl;
                 std::cout << "play <card>: play specified card." << std::endl;
-                std::cout << "discard: discard trash from hand." << std::endl;
+                std::cout << "discard:     discard trash from hand." << std::endl;
-                std::cout << "revert: revert last turn of game." << std::endl;
+                std::cout << "revert:      revert last turn of game." << std::endl;
-                std::cout << "actions: display list of reasonable actions to take and their winning chances." << std::endl;
+                std::cout << "actions:     display list of reasonable actions to take and their winning chances." << std::endl;
-                std::cout << "id: display id of state. Has no inherent meaning, useful for debugging." << std::endl;
+                std::cout << "evaluate:    evaluate current game state recursively. Potentially runtime-expensive." << std::endl;
-                std::cout << "evaluate: evaluate current game state recursively. Potentially runtime-expensive." << std::endl;
+                std::cout << "id:          display id of state. Has no inherent meaning, useful for debugging." << std::endl;
+                std::cout << "quit:        Quit this interactive shell." << std::endl;
                 continue;
             }
 
+            if (prompt.starts_with("quit")) {
+                std::cout << "Quitting." << std::endl;
+                clear_history();
+                break;
+            }
+
             if (prompt.starts_with("state")) {
                 std::cout << *game << std::endl;
                 const std::optional<probability_t> prob = game->lookup();
@@ -130,11 +175,17 @@ namespace Hanabi {
                 std::cout << "Evaluating current game state, this might take a while." << std::endl;
                 game->evaluate_state();
                 std::cout << "Evaluated state." << std::endl;
+                continue;
             }
 
             if (prompt.starts_with("revert")) {
+                if (depth == 0) {
+                    std::cout << "Cannot revert more than base state." << std::endl;
+                    continue;
+                }
                 std::cout << "Reverting one turn" << std::endl;
                 game->revert();
+                depth--;
                 continue;
             }
 
@@ -147,6 +198,7 @@ namespace Hanabi {
                 const Card card = parse_card(prompt.substr(5,2));
                 if (prompt.length() < 7) {
                     std::cout << "No card specified." << std::endl;
+                    continue;
                 }
                 if (card == Cards::unknown) {
                     std::cout << "Could not parse card " << prompt.substr(5,2) << std::endl;
@@ -155,11 +207,13 @@ namespace Hanabi {
                 const hand_index_t index = game->find_card_in_hand(card);
                 if (index == hand_index_t(-1)) {
                     std::cout << "This card is not in the current players hand, aborting." << std::endl;
+                    continue;
                 }
                 if (!ask_for_card_and_rotate_draw(game, index, true)) {
                     continue;
                 }
                 game->play(index);
+                depth++;
                 continue;
             }
 
@@ -184,11 +238,17 @@ namespace Hanabi {
                     continue;
                 }
                 game->discard(trash_index);
+                depth++;
                 continue;
             }
 
             if (prompt.starts_with("clue")) {
+                if (game->num_clues() == 0) {
+                    std::cout << "You cannot give a clue at 0 clues." << std::endl;
+                    continue;
+                }
                 game->give_clue();
+                depth++;
                 continue;
             }
 

cli_interface.h

@@ -5,7 +5,7 @@
 #include "game_state.h"
 
 namespace Hanabi {
-    [[noreturn]] [[noreturn]] void cli(const std::shared_ptr<HanabiStateIF>& game);
+    void cli(const std::shared_ptr<HanabiStateIF>& game);
 }