M1 step 4a: IRC protocol core (host-tested)

lib/irc: IrcMessage parse/serialize, base64, ReconnectPolicy (5 s .. 5 min), IrcConfig (validated, persisted) and IrcSession: registration with SASL PLAIN or NickServ, nick fallback, PING, Buffers capped at 50 lines with unread counts, Mentions, CTCP ACTION/VERSION, topics, /names on request only, others' join/part/quit hidden, user commands, and rejoining after a pause. No networking: the session returns lines to send, Log entries and Notifications. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
2026-10-02 15:03:21 +02:00
parent d3948ccc3a
commit 311eb38723
11 changed files with 1142 additions and 0 deletions
@@ -0,0 +1,98 @@
+#pragma once
+
+#include <cstdint>
+#include <deque>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "irc_config.h"
+#include "irc_message.h"
+
+namespace roro {
+
+struct IrcLine {
+    enum class Kind { Message, Action, Notice, Info, Own, OwnAction };
+    int64_t utc;  // -1 if the clock wasn't set
+    Kind kind;
+    std::string nick;
+    std::string text;
+};
+
+// One IRC conversation (see Buffer in CONTEXT.md).
+struct IrcBuffer {
+    enum class Type { Server, Channel, Query };
+    std::string name;
+    Type type;
+    std::deque<IrcLine> lines;  // the most recent kLinesPerBuffer; full history goes to Logs
+    int unread = 0;
+    bool mentioned = false;
+    bool joined = false;
+    std::string topic;
+};
+
+struct IrcLogEntry {
+    std::string buffer;
+    IrcLine line;
+};
+
+// What the session wants done: lines to send, Log entries, Notification texts.
+struct IrcEffects {
+    std::vector<std::string> send;
+    std::vector<IrcLogEntry> logs;
+    std::vector<std::string> notifications;
+};
+
+// The IRC protocol, without any networking: registration (SASL PLAIN or NickServ), Buffers,
+// unread counts, Mentions, the user's commands, and rejoining after a pause. The IRC Service
+// feeds it received lines and carries out the effects.
+class IrcSession {
+   public:
+    static constexpr size_t kLinesPerBuffer = 50;
+    static constexpr int kMaxBuffers = 12;
+
+    explicit IrcSession(const IrcConfig& config);
+
+    void connected(int64_t utc);
+    void disconnected(int64_t utc, const std::string& reason);
+    void receive(const std::string& raw, int64_t utc);
+    void input(int buffer, const std::string& text, int64_t utc);
+
+    // The Buffer the user is looking at (-1: none); it neither counts unread nor notifies.
+    void setViewing(int buffer);
+
+    bool registered() const { return registered_; }
+    bool quitRequested() const { return quit_; }
+    const std::string& nick() const { return nick_; }
+
+    int bufferCount() const { return static_cast<int>(buffers_.size()); }
+    const IrcBuffer& buffer(int i) const { return buffers_[i]; }
+    int totalUnread() const;
+
+    IrcEffects takeEffects();
+
+   private:
+    void send(const std::string& line) { effects_.send.push_back(line); }
+    int findBuffer(const std::string& name) const;
+    int bufferFor(const std::string& name, IrcBuffer::Type type);  // creates if needed and possible
+    void add(int buffer, IrcLine::Kind kind, const std::string& nick, const std::string& text, int64_t utc,
+             bool countsAsMention = false);
+    void info(int buffer, const std::string& text, int64_t utc) { add(buffer, IrcLine::Kind::Info, "", text, utc); }
+    bool mentionsMe(const std::string& text) const;
+    void onPrivmsg(const IrcMessage& m, int64_t utc, bool notice);
+    void onWelcome(const IrcMessage& m, int64_t utc);
+    void command(int buffer, const std::string& text, int64_t utc);
+    void say(int buffer, const std::string& text, int64_t utc, bool action);
+
+    const IrcConfig& config_;
+    std::vector<IrcBuffer> buffers_;
+    std::string nick_;
+    bool registered_ = false;
+    bool quit_ = false;
+    int viewing_ = -1;
+    std::set<std::string> namesRequested_;
+    std::vector<std::string> rejoin_;  // IRC channels to join again after a reconnect
+    IrcEffects effects_;
+};
+
+}  // namespace roro