IRC App: Alt scrolls, Up/Down recall sent lines; /j for /join

- Alt + ; / Alt + . scroll the Buffer back and forward
- Up / Down (Fn + ; / Fn + .) browse the last 30 sent lines, shell-style,
  returning to the draft past the newest (InputHistory, host-tested)
- /j is short for /join

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

test/test_input_history/test_input_history.cpp

@@ -0,0 +1,73 @@
+#include <unity.h>
+
+#include "input_history.h"
+
+using namespace roro;
+
+void setUp() {}
+void tearDown() {}
+
+void test_up_brings_back_previous_lines_newest_first() {
+    InputHistory h(10);
+    h.add("one");
+    h.add("two");
+    std::string line;
+    TEST_ASSERT_TRUE(h.up("", line));
+    TEST_ASSERT_EQUAL_STRING("two", line.c_str());
+    TEST_ASSERT_TRUE(h.up("two", line));
+    TEST_ASSERT_EQUAL_STRING("one", line.c_str());
+    TEST_ASSERT_FALSE(h.up("one", line));  // nothing older
+}
+
+void test_down_returns_to_the_draft_being_typed() {
+    InputHistory h(10);
+    h.add("one");
+    std::string line;
+    h.up("half typed", line);
+    TEST_ASSERT_TRUE(h.down(line));
+    TEST_ASSERT_EQUAL_STRING("half typed", line.c_str());
+    TEST_ASSERT_FALSE(h.down(line));  // already at the draft
+}
+
+void test_adding_resets_browsing_and_skips_repeats_and_empty_lines() {
+    InputHistory h(10);
+    h.add("same");
+    h.add("same");
+    h.add("");
+    std::string line;
+    h.up("", line);
+    TEST_ASSERT_FALSE(h.up(line, line));  // only one entry kept
+    h.add("next");
+    TEST_ASSERT_TRUE(h.up("", line));
+    TEST_ASSERT_EQUAL_STRING("next", line.c_str());
+}
+
+void test_keeps_only_the_most_recent_lines() {
+    InputHistory h(2);
+    h.add("a");
+    h.add("b");
+    h.add("c");
+    std::string line;
+    h.up("", line);
+    h.up(line, line);
+    TEST_ASSERT_EQUAL_STRING("b", line.c_str());
+    TEST_ASSERT_FALSE(h.up(line, line));
+}
+
+void test_empty_history_does_nothing() {
+    InputHistory h(5);
+    std::string line = "draft";
+    TEST_ASSERT_FALSE(h.up("draft", line));
+    TEST_ASSERT_FALSE(h.down(line));
+    TEST_ASSERT_EQUAL_STRING("draft", line.c_str());
+}
+
+int main() {
+    UNITY_BEGIN();
+    RUN_TEST(test_up_brings_back_previous_lines_newest_first);
+    RUN_TEST(test_down_returns_to_the_draft_being_typed);
+    RUN_TEST(test_adding_resets_browsing_and_skips_repeats_and_empty_lines);
+    RUN_TEST(test_keeps_only_the_most_recent_lines);
+    RUN_TEST(test_empty_history_does_nothing);
+    return UNITY_END();
+}

test/test_irc_session/test_irc_session.cpp

@@ -366,6 +366,16 @@ void test_input_message_and_commands() {
     TEST_ASSERT_EQUAL_STRING("/not a command", f.session->buffer(b).lines.back().text.c_str());
 }
 
+void test_j_is_short_for_join() {
+    Fixture f;
+    f.registerNow();
+    f.session->input(0, "/j #short", 0);
+    f.session->input(0, "/j #locked k3y", 0);
+    f.take();
+    TEST_ASSERT_TRUE(f.sent("JOIN #short"));
+    TEST_ASSERT_TRUE(f.sent("JOIN #locked k3y"));
+}
+
 void test_msg_opens_a_query_buffer() {
     Fixture f;
     f.registerNow();
@@ -483,6 +493,7 @@ int main() {
     RUN_TEST(test_action_and_ctcp_version);
     RUN_TEST(test_topic_is_kept);
     RUN_TEST(test_input_message_and_commands);
+    RUN_TEST(test_j_is_short_for_join);
     RUN_TEST(test_msg_opens_a_query_buffer);
     RUN_TEST(test_text_in_the_server_buffer_explains_instead_of_sending);
     RUN_TEST(test_quit_sends_and_is_remembered);