Enter copies indent from the current line

Shift+Enter (GUI) and ESC-Enter (terminal) insert a raw newline.
Paste and prompts keep using Newline.

Command.h

@@ -37,7 +37,7 @@ enum class CommandId {
 	// Editing
 	InsertText, // arg: text to insert at cursor (UTF-8, no newlines)
 	Newline, // insert a newline at cursor
-	SmartNewline, // insert a newline with auto-indent (Shift-Enter)
+	SmartNewline, // insert a newline with auto-indent (Enter)
 	Backspace, // delete char before cursor (may join lines)
 	DeleteChar, // delete char at cursor (may join lines)
 	KillToEOL, // delete from cursor to end of line; if at EOL, delete newline

ImGuiInputHandler.cc

@@ -139,11 +139,7 @@ map_key(const SDL_Keycode key,
 	case SDLK_KP_ENTER:
 		k_prefix = false;
 		k_ctrl_pending = false;
-		if (mod & KMOD_SHIFT) {
-			out = {true, CommandId::SmartNewline, "", 0};
-		} else {
-			out = {true, CommandId::Newline, "", 0};
-		}
+		out            = {true, KEnterCommand((mod & KMOD_SHIFT) != 0), "", 0};
 		return true;
 	case SDLK_ESCAPE:
 		k_prefix = false;

KKeymap.cc

@@ -235,10 +235,17 @@ KLookupEscCommand(const int ascii_key, CommandId &out) -> bool
 		return true;
 	case '\n':
 	case '\r':
-		out = CommandId::SmartNewline; // Shift+Enter (some terminals send this as Alt+Enter sequences)
+		out = KEnterCommand(true); // ESC-Enter: raw newline (terminals rarely send Shift+Enter)
 		return true;
 	default:
 		break;
 	}
 	return false;
 }
+
+
+auto
+KEnterCommand(const bool raw) -> CommandId
+{
+	return raw ? CommandId::Newline : CommandId::SmartNewline;
+}

KKeymap.h

@@ -20,6 +20,10 @@ bool KLookupCtrlCommand(int ascii_key, CommandId &out);
 // ascii_key should be the lowercase ASCII of the letter.
 bool KLookupEscCommand(int ascii_key, CommandId &out);
 
+// Enter: copy indent from the current line. Shift+Enter (GUI) and ESC-Enter
+// (terminal) insert a raw newline at column 0.
+CommandId KEnterCommand(bool raw);
+
 // Utility: normalize an int keycode to lowercased ASCII if it's in printable range.
 inline int
 KLowerAscii(const int key)

TerminalInputHandler.cc

@@ -57,7 +57,8 @@ map_key_to_command(const int ch,
 	// ESC marks the next key as Meta. Consume that flag on every other key up
 	// front: keys handled before the Meta lookup below (arrows, mouse, Enter,
 	// control chords) used to leave it set, turning a later plain key into a
-	// Meta command (ESC, Left, d => delete word).
+	// Meta command (ESC, Left, d => delete word). KEY_ENTER still sees `meta`
+	// so ESC-Enter can insert a raw newline.
 	const bool meta = esc_meta && ch != 27;
 	if (ch != 27)
 		esc_meta = false;
@@ -67,7 +68,7 @@ map_key_to_command(const int ch,
 		// Some terminals send KEY_ENTER distinct from '\n'/'\r'
 		k_prefix = false;
 		k_ctrl_pending = false;
-		out            = {true, CommandId::Newline, "", 0};
+		out            = {true, KEnterCommand(meta), "", 0};
 		return true;
 	case KEY_MOUSE: {
 		k_prefix       = false;
@@ -195,7 +196,7 @@ map_key_to_command(const int ch,
 
 	// Meta (ESC-prefixed) keys: backspace, Enter and printable keys use the
 	// ESC keymap. Checked before control chords so ESC ^H (meta-backspace) is
-	// not taken as C-h, and before Enter so ESC Enter reaches SmartNewline.
+	// not taken as C-h, and before Enter so ESC Enter reaches a raw newline.
 	// Other control chords after ESC act as themselves.
 	const bool is_backspace = (is_keycode && ch == KEY_BACKSPACE) || ch == 127 || ch == CTRL('H');
 	const bool meta_key = meta && (is_backspace || (!is_keycode && (ch == '\n' || ch == '\r' || ch >= 0x20)));
@@ -315,7 +316,7 @@ map_key_to_command(const int ch,
 	if (ch == '\n' || ch == '\r') {
 		k_prefix       = false;
 		k_ctrl_pending = false;
-		out            = {true, CommandId::Newline, "", 0};
+		out            = {true, KEnterCommand(false), "", 0};
 		return true;
 	}
 	// Backspace in ncurses can be KEY_BACKSPACE or 127

tests/test_kkeymap.cc

@@ -97,3 +97,25 @@ TEST(KKeymap_EscChords_CanonicalChords)
 
 	ASSERT_EQ(KLookupEscCommand('z', id), false);
 }
+
+
+TEST(KKeymap_Enter_IsSmartNewline)
+{
+	ASSERT_EQ(KEnterCommand(false), CommandId::SmartNewline);
+}
+
+
+TEST(KKeymap_ShiftEnter_IsNewline)
+{
+	ASSERT_EQ(KEnterCommand(true), CommandId::Newline);
+}
+
+
+TEST(KKeymap_EscEnter_IsNewline)
+{
+	CommandId id{};
+	ASSERT_TRUE(KLookupEscCommand('\n', id));
+	ASSERT_EQ(id, CommandId::Newline);
+	ASSERT_TRUE(KLookupEscCommand('\r', id));
+	ASSERT_EQ(id, CommandId::Newline);
+}