From 12fe0a3b29df6335f77c0ca8760b912ff43d9515 Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Sat, 8 Aug 2020 19:44:54 +0200
Subject: [PATCH] tweaks: normalize the indentation after the previous change

This finally gets rid of the piece of specially reduced indentation
(<-<- ... ->->) that made it hard to see the structure of the code.
---
 src/winio.c | 924 ++++++++++++++++++++++++++--------------------------
 1 file changed, 461 insertions(+), 463 deletions(-)

diff --git a/src/winio.c b/src/winio.c
index e2162f45..f6afa1d2 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -331,133 +331,133 @@ int arrow_from_ABCD(int letter)
 /* Translate a sequence that began with "Esc O" to its corresponding key code. */
 int convert_SS3_sequence(const int *seq, size_t length, int *consumed)
 {
-		switch (seq[0]) {
-			case '1':
-				if (length > 3  && seq[1] == ';') {
-					*consumed = 4;
-					switch (seq[2]) {
-						case '2':
-							switch (seq[3]) {
-								case 'A': /* Esc O 1 ; 2 A == Shift-Up on Terminal. */
-								case 'B': /* Esc O 1 ; 2 B == Shift-Down on Terminal. */
-								case 'C': /* Esc O 1 ; 2 C == Shift-Right on Terminal. */
-								case 'D': /* Esc O 1 ; 2 D == Shift-Left on Terminal. */
-									shift_held = TRUE;
-									return arrow_from_ABCD(seq[3]);
-							}
-							break;
-						case '5':
-							switch (seq[3]) {
-								case 'A': /* Esc O 1 ; 5 A == Ctrl-Up on Terminal. */
-									return CONTROL_UP;
-								case 'B': /* Esc O 1 ; 5 B == Ctrl-Down on Terminal. */
-									return CONTROL_DOWN;
-								case 'C': /* Esc O 1 ; 5 C == Ctrl-Right on Terminal. */
-									return CONTROL_RIGHT;
-								case 'D': /* Esc O 1 ; 5 D == Ctrl-Left on Terminal. */
-									return CONTROL_LEFT;
-							}
-							break;
-					}
+	switch (seq[0]) {
+		case '1':
+			if (length > 3  && seq[1] == ';') {
+				*consumed = 4;
+				switch (seq[2]) {
+					case '2':
+						switch (seq[3]) {
+							case 'A': /* Esc O 1 ; 2 A == Shift-Up on Terminal. */
+							case 'B': /* Esc O 1 ; 2 B == Shift-Down on Terminal. */
+							case 'C': /* Esc O 1 ; 2 C == Shift-Right on Terminal. */
+							case 'D': /* Esc O 1 ; 2 D == Shift-Left on Terminal. */
+								shift_held = TRUE;
+								return arrow_from_ABCD(seq[3]);
+						}
+						break;
+					case '5':
+						switch (seq[3]) {
+							case 'A': /* Esc O 1 ; 5 A == Ctrl-Up on Terminal. */
+								return CONTROL_UP;
+							case 'B': /* Esc O 1 ; 5 B == Ctrl-Down on Terminal. */
+								return CONTROL_DOWN;
+							case 'C': /* Esc O 1 ; 5 C == Ctrl-Right on Terminal. */
+								return CONTROL_RIGHT;
+							case 'D': /* Esc O 1 ; 5 D == Ctrl-Left on Terminal. */
+								return CONTROL_LEFT;
+						}
+						break;
 				}
-				break;
-			case '2':  /* Shift */
-			case '3':  /* Alt */
-			case '4':  /* Shift+Alt */
-			case '5':  /* Ctrl */
-			case '6':  /* Shift+Ctrl */
-			case '7':  /* Alt+Ctrl */
-			case '8':  /* Shift+Alt+Ctrl */
-				if (length > 1) {
-					*consumed = 2;
-					/* Do not accept multiple modifiers. */
-					if (seq[0] == '4' || seq[0] > '5')
-						return FOREIGN_SEQUENCE;
+			}
+			break;
+		case '2':  /* Shift */
+		case '3':  /* Alt */
+		case '4':  /* Shift+Alt */
+		case '5':  /* Ctrl */
+		case '6':  /* Shift+Ctrl */
+		case '7':  /* Alt+Ctrl */
+		case '8':  /* Shift+Alt+Ctrl */
+			if (length > 1) {
+				*consumed = 2;
+				/* Do not accept multiple modifiers. */
+				if (seq[0] == '4' || seq[0] > '5')
+					return FOREIGN_SEQUENCE;
 #ifndef NANO_TINY
-					switch (seq[1]) {
-						case 'A': /* Esc O 5 A == Ctrl-Up on Haiku. */
-							return CONTROL_UP;
-						case 'B': /* Esc O 5 B == Ctrl-Down on Haiku. */
-							return CONTROL_DOWN;
-						case 'C': /* Esc O 5 C == Ctrl-Right on Haiku. */
-							return CONTROL_RIGHT;
-						case 'D': /* Esc O 5 D == Ctrl-Left on Haiku. */
-							return CONTROL_LEFT;
-					}
-#endif
-					/* Translate Shift+digit on the keypad to the digit
-					 * (Esc O 2 p == Shift-0, ...), modifier+operator to
-					 * the operator, and modifier+Enter to CR. */
-					return (seq[1] - 0x40);
+				switch (seq[1]) {
+					case 'A': /* Esc O 5 A == Ctrl-Up on Haiku. */
+						return CONTROL_UP;
+					case 'B': /* Esc O 5 B == Ctrl-Down on Haiku. */
+						return CONTROL_DOWN;
+					case 'C': /* Esc O 5 C == Ctrl-Right on Haiku. */
+						return CONTROL_RIGHT;
+					case 'D': /* Esc O 5 D == Ctrl-Left on Haiku. */
+						return CONTROL_LEFT;
 				}
-				break;
-			case 'A': /* Esc O A == Up on VT100/VT320. */
-			case 'B': /* Esc O B == Down on VT100/VT320. */
-			case 'C': /* Esc O C == Right on VT100/VT320. */
-			case 'D': /* Esc O D == Left on VT100/VT320. */
-				return arrow_from_ABCD(seq[0]);
-			case 'F': /* Esc O F == End on old xterm. */
-				return KEY_END;
-			case 'H': /* Esc O H == Home on old xterm. */
-				return KEY_HOME;
-			case 'M': /* Esc O M == Enter on numeric keypad
-					   * with NumLock off on VT100/VT220/VT320. */
-				return KEY_ENTER;
-			case 'P': /* Esc O P == F1 on VT100/VT220/VT320/Mach console. */
-			case 'Q': /* Esc O Q == F2 on VT100/VT220/VT320/Mach console. */
-			case 'R': /* Esc O R == F3 on VT100/VT220/VT320/Mach console. */
-			case 'S': /* Esc O S == F4 on VT100/VT220/VT320/Mach console. */
-			case 'T': /* Esc O T == F5 on Mach console. */
-			case 'U': /* Esc O U == F6 on Mach console. */
-			case 'V': /* Esc O V == F7 on Mach console. */
-			case 'W': /* Esc O W == F8 on Mach console. */
-			case 'X': /* Esc O X == F9 on Mach console. */
-			case 'Y': /* Esc O Y == F10 on Mach console. */
-				return KEY_F(seq[0] - 'O');
-			case 'a': /* Esc O a == Ctrl-Up on rxvt/Eterm. */
-				return CONTROL_UP;
-			case 'b': /* Esc O b == Ctrl-Down on rxvt/Eterm. */
-				return CONTROL_DOWN;
-			case 'c': /* Esc O c == Ctrl-Right on rxvt/Eterm. */
-				return CONTROL_RIGHT;
-			case 'd': /* Esc O d == Ctrl-Left on rxvt/Eterm. */
-				return CONTROL_LEFT;
-			case 'j': /* Esc O j == '*' on numeric keypad with
-					   * NumLock off on xterm/rxvt/Eterm. */
-				return '*';
-			case 'k': /* Esc O k == '+' on the same. */
-				return '+';
-			case 'l': /* Esc O l == ',' on VT100/VT220/VT320. */
-				return ',';
-			case 'm': /* Esc O m == '-' on numeric keypad with
-					   * NumLock off on VTnnn/xterm/rxvt/Eterm. */
-				return '-';
-			case 'n': /* Esc O n == Delete (.) on numeric keypad
-					   * with NumLock off on rxvt/Eterm. */
-				return KEY_DC;
-			case 'o': /* Esc O o == '/' on numeric keypad with
-					   * NumLock off on VTnnn/xterm/rxvt/Eterm. */
-				return '/';
-			case 'p': /* Esc O p == Insert (0) on numeric keypad
-					   * with NumLock off on rxvt/Eterm. */
-				return KEY_IC;
-			case 'q': /* Esc O q == End (1) on the same. */
-				return KEY_END;
-			case 'r': /* Esc O r == Down (2) on the same. */
-				return KEY_DOWN;
-			case 's': /* Esc O s == PageDown (3) on the same. */
-				return KEY_NPAGE;
-			case 't': /* Esc O t == Left (4) on the same. */
-				return KEY_LEFT;
-			case 'v': /* Esc O v == Right (6) on the same. */
-				return KEY_RIGHT;
-			case 'w': /* Esc O w == Home (7) on the same. */
-				return KEY_HOME;
-			case 'x': /* Esc O x == Up (8) on the same. */
-				return KEY_UP;
-			case 'y': /* Esc O y == PageUp (9) on the same. */
-				return KEY_PPAGE;
-		}
+#endif
+				/* Translate Shift+digit on the keypad to the digit
+				 * (Esc O 2 p == Shift-0, ...), modifier+operator to
+				 * the operator, and modifier+Enter to CR. */
+				return (seq[1] - 0x40);
+			}
+			break;
+		case 'A': /* Esc O A == Up on VT100/VT320. */
+		case 'B': /* Esc O B == Down on VT100/VT320. */
+		case 'C': /* Esc O C == Right on VT100/VT320. */
+		case 'D': /* Esc O D == Left on VT100/VT320. */
+			return arrow_from_ABCD(seq[0]);
+		case 'F': /* Esc O F == End on old xterm. */
+			return KEY_END;
+		case 'H': /* Esc O H == Home on old xterm. */
+			return KEY_HOME;
+		case 'M': /* Esc O M == Enter on numeric keypad
+				   * with NumLock off on VT100/VT220/VT320. */
+			return KEY_ENTER;
+		case 'P': /* Esc O P == F1 on VT100/VT220/VT320/Mach console. */
+		case 'Q': /* Esc O Q == F2 on VT100/VT220/VT320/Mach console. */
+		case 'R': /* Esc O R == F3 on VT100/VT220/VT320/Mach console. */
+		case 'S': /* Esc O S == F4 on VT100/VT220/VT320/Mach console. */
+		case 'T': /* Esc O T == F5 on Mach console. */
+		case 'U': /* Esc O U == F6 on Mach console. */
+		case 'V': /* Esc O V == F7 on Mach console. */
+		case 'W': /* Esc O W == F8 on Mach console. */
+		case 'X': /* Esc O X == F9 on Mach console. */
+		case 'Y': /* Esc O Y == F10 on Mach console. */
+			return KEY_F(seq[0] - 'O');
+		case 'a': /* Esc O a == Ctrl-Up on rxvt/Eterm. */
+			return CONTROL_UP;
+		case 'b': /* Esc O b == Ctrl-Down on rxvt/Eterm. */
+			return CONTROL_DOWN;
+		case 'c': /* Esc O c == Ctrl-Right on rxvt/Eterm. */
+			return CONTROL_RIGHT;
+		case 'd': /* Esc O d == Ctrl-Left on rxvt/Eterm. */
+			return CONTROL_LEFT;
+		case 'j': /* Esc O j == '*' on numeric keypad with
+				   * NumLock off on xterm/rxvt/Eterm. */
+			return '*';
+		case 'k': /* Esc O k == '+' on the same. */
+			return '+';
+		case 'l': /* Esc O l == ',' on VT100/VT220/VT320. */
+			return ',';
+		case 'm': /* Esc O m == '-' on numeric keypad with
+				   * NumLock off on VTnnn/xterm/rxvt/Eterm. */
+			return '-';
+		case 'n': /* Esc O n == Delete (.) on numeric keypad
+				   * with NumLock off on rxvt/Eterm. */
+			return KEY_DC;
+		case 'o': /* Esc O o == '/' on numeric keypad with
+				   * NumLock off on VTnnn/xterm/rxvt/Eterm. */
+			return '/';
+		case 'p': /* Esc O p == Insert (0) on numeric keypad
+				   * with NumLock off on rxvt/Eterm. */
+			return KEY_IC;
+		case 'q': /* Esc O q == End (1) on the same. */
+			return KEY_END;
+		case 'r': /* Esc O r == Down (2) on the same. */
+			return KEY_DOWN;
+		case 's': /* Esc O s == PageDown (3) on the same. */
+			return KEY_NPAGE;
+		case 't': /* Esc O t == Left (4) on the same. */
+			return KEY_LEFT;
+		case 'v': /* Esc O v == Right (6) on the same. */
+			return KEY_RIGHT;
+		case 'w': /* Esc O w == Home (7) on the same. */
+			return KEY_HOME;
+		case 'x': /* Esc O x == Up (8) on the same. */
+			return KEY_UP;
+		case 'y': /* Esc O y == PageUp (9) on the same. */
+			return KEY_PPAGE;
+	}
 
 	return FOREIGN_SEQUENCE;
 }
@@ -465,347 +465,345 @@ int convert_SS3_sequence(const int *seq, size_t length, int *consumed)
 /* Translate a sequence that began with "Esc [" to its corresponding key code. */
 int convert_CSI_sequence(const int *seq, size_t length, int *consumed)
 {
-		if (seq[0] < '9')
-			*consumed = 2;
-		switch (seq[0]) {
-			case '1':
-				if (length > 1 && seq[1] == '~')
-					/* Esc [ 1 ~ == Home on VT320/Linux console. */
-					return KEY_HOME;
-				else if (length > 2 && seq[2] == '~') {
-					*consumed = 3;
-					switch (seq[1]) {
-						case '1': /* Esc [ 1 1 ~ == F1 on rxvt/Eterm. */
-						case '2': /* Esc [ 1 2 ~ == F2 on rxvt/Eterm. */
-						case '3': /* Esc [ 1 3 ~ == F3 on rxvt/Eterm. */
-						case '4': /* Esc [ 1 4 ~ == F4 on rxvt/Eterm. */
-						case '5': /* Esc [ 1 5 ~ == F5 on xterm/rxvt/Eterm. */
-							return KEY_F(seq[1] - '0');
-						case '7': /* Esc [ 1 7 ~ == F6 on VT220/VT320/
-								   * Linux console/xterm/rxvt/Eterm. */
-						case '8': /* Esc [ 1 8 ~ == F7 on the same. */
-						case '9': /* Esc [ 1 9 ~ == F8 on the same. */
-							return KEY_F(seq[1] - '1');
-					}
-				} else if (length > 3 && seq[1] == ';') {
-		/* <-<-<-<-<-<-<- */
-		*consumed = 4;
-		switch (seq[2]) {
-			case '2':
-				switch (seq[3]) {
-					case 'A': /* Esc [ 1 ; 2 A == Shift-Up on xterm. */
-					case 'B': /* Esc [ 1 ; 2 B == Shift-Down on xterm. */
-					case 'C': /* Esc [ 1 ; 2 C == Shift-Right on xterm. */
-					case 'D': /* Esc [ 1 ; 2 D == Shift-Left on xterm. */
-						shift_held = TRUE;
-						return arrow_from_ABCD(seq[3]);
-#ifndef NANO_TINY
-					case 'F': /* Esc [ 1 ; 2 F == Shift-End on xterm. */
-						return SHIFT_END;
-					case 'H': /* Esc [ 1 ; 2 H == Shift-Home on xterm. */
-						return SHIFT_HOME;
-#endif
-				}
-				break;
-#ifndef NANO_TINY
-			case '9': /* To accommodate iTerm2 in "xterm mode". */
-			case '3':
-				switch (seq[3]) {
-					case 'A': /* Esc [ 1 ; 3 A == Alt-Up on xterm. */
-						return ALT_UP;
-					case 'B': /* Esc [ 1 ; 3 B == Alt-Down on xterm. */
-						return ALT_DOWN;
-					case 'C': /* Esc [ 1 ; 3 C == Alt-Right on xterm. */
-						return ALT_RIGHT;
-					case 'D': /* Esc [ 1 ; 3 D == Alt-Left on xterm. */
-						return ALT_LEFT;
-				}
-				break;
-			case '4':
-				/* When the arrow keys are held together with Shift+Meta,
-				 * act as if they are Home/End/PgUp/PgDown with Shift. */
-				switch (seq[3]) {
-					case 'A': /* Esc [ 1 ; 4 A == Shift-Alt-Up on xterm. */
-						return SHIFT_PAGEUP;
-					case 'B': /* Esc [ 1 ; 4 B == Shift-Alt-Down on xterm. */
-						return SHIFT_PAGEDOWN;
-					case 'C': /* Esc [ 1 ; 4 C == Shift-Alt-Right on xterm. */
-						return SHIFT_END;
-					case 'D': /* Esc [ 1 ; 4 D == Shift-Alt-Left on xterm. */
-						return SHIFT_HOME;
-				}
-				break;
-#endif
-			case '5':
-				switch (seq[3]) {
-					case 'A': /* Esc [ 1 ; 5 A == Ctrl-Up on xterm. */
-						return CONTROL_UP;
-					case 'B': /* Esc [ 1 ; 5 B == Ctrl-Down on xterm. */
-						return CONTROL_DOWN;
-					case 'C': /* Esc [ 1 ; 5 C == Ctrl-Right on xterm. */
-						return CONTROL_RIGHT;
-					case 'D': /* Esc [ 1 ; 5 D == Ctrl-Left on xterm. */
-						return CONTROL_LEFT;
-					case 'F': /* Esc [ 1 ; 5 F == Ctrl-End on xterm. */
-						return CONTROL_END;
-					case 'H': /* Esc [ 1 ; 5 H == Ctrl-Home on xterm. */
-						return CONTROL_HOME;
-				}
-				break;
-#ifndef NANO_TINY
-			case '6':
-				switch (seq[3]) {
-					case 'A': /* Esc [ 1 ; 6 A == Shift-Ctrl-Up on xterm. */
-						return shiftcontrolup;
-					case 'B': /* Esc [ 1 ; 6 B == Shift-Ctrl-Down on xterm. */
-						return shiftcontroldown;
-					case 'C': /* Esc [ 1 ; 6 C == Shift-Ctrl-Right on xterm. */
-						return shiftcontrolright;
-					case 'D': /* Esc [ 1 ; 6 D == Shift-Ctrl-Left on xterm. */
-						return shiftcontrolleft;
-					case 'F': /* Esc [ 1 ; 6 F == Shift-Ctrl-End on xterm. */
-						return shiftcontrolend;
-					case 'H': /* Esc [ 1 ; 6 H == Shift-Ctrl-Home on xterm. */
-						return shiftcontrolhome;
-				}
-				break;
-#endif
-		}
-		/* ->->->->->->-> */
-				} else if (length > 4 && seq[2] == ';' && seq[4] == '~')
-					/* Esc [ 1 n ; 2 ~ == F17...F20 on some terminals. */
-					*consumed = 5;
-#ifdef USE_SLANG
-				else if (length == 3 && seq[2] == ';')
-					/* Discard broken sequences that Slang produces. */
-					*consumed = 3;
-#endif
-				break;
-			case '2':
-				if (length > 2 && seq[2] == '~') {
-					*consumed = 3;
-					switch (seq[1]) {
-						case '0': /* Esc [ 2 0 ~ == F9 on VT220/VT320/
-								   * Linux console/xterm/rxvt/Eterm. */
-							return KEY_F(9);
-						case '1': /* Esc [ 2 1 ~ == F10 on the same. */
-							return KEY_F(10);
-						case '3': /* Esc [ 2 3 ~ == F11 on the same. */
-							return KEY_F(11);
-						case '4': /* Esc [ 2 4 ~ == F12 on the same. */
-							return KEY_F(12);
-					}
-				} else if (length > 1 && seq[1] == '~')
-					/* Esc [ 2 ~ == Insert on VT220/VT320/
-					 * Linux console/xterm/Terminal. */
-					return KEY_IC;
-				else if (length > 3 && seq[1] == ';' && seq[3] == '~') {
-					/* Esc [ 2 ; x ~ == modified Insert on xterm. */
-					*consumed = 4;
-#ifndef NANO_TINY
-					if (seq[2] == '3')
-						return ALT_INSERT;
-#endif
-				}
-				else if (length > 4 && seq[2] == ';' && seq[4] == '~')
-					/* Esc [ 2 n ; 2 ~ == F21...F24 on some terminals. */
-					*consumed = 5;
-#ifdef USE_SLANG
-				else if (length == 3 && seq[2] == ';')
-					/* Discard broken sequences that Slang produces. */
-					*consumed = 3;
-#endif
-#ifndef NANO_TINY
-				else if (length > 3 && seq[1] == '0' && seq[3] == '~') {
-					/* Esc [ 2 0 0 ~ == start of a bracketed paste,
-					 * Esc [ 2 0 1 ~ == end of a bracketed paste. */
-					*consumed = 4;
-					if (seq[2] == '0') {
-						bracketed_paste = TRUE;
-						return BRACKETED_PASTE_MARKER;
-					} else if (seq[2] == '1') {
-						bracketed_paste = FALSE;
-						return BRACKETED_PASTE_MARKER;
-					}
-				}
-#endif
-				break;
-			case '3': /* Esc [ 3 ~ == Delete on VT220/VT320/
-					   * Linux console/xterm/Terminal. */
-				if (length > 1 && seq[1] == '~')
-					return KEY_DC;
-				if (length > 3 && seq[1] == ';' && seq[3] == '~') {
-					*consumed = 4;
-#ifndef NANO_TINY
-					if (seq[2] == '2')
-						/* Esc [ 3 ; 2 ~ == Shift-Delete on xterm/Terminal. */
-						return SHIFT_DELETE;
-					if (seq[2] == '3')
-						/* Esc [ 3 ; 3 ~ == Alt-Delete on xterm/rxvt/Eterm/Terminal. */
-						return ALT_DELETE;
-					if (seq[2] == '5')
-						/* Esc [ 3 ; 5 ~ == Ctrl-Delete on xterm. */
-						return CONTROL_DELETE;
-					if (seq[2] == '6')
-						/* Esc [ 3 ; 6 ~ == Ctrl-Shift-Delete on xterm. */
-						return controlshiftdelete;
-#endif
-				}
-#ifndef NANO_TINY
-				if (length > 1 && seq[1] == '$')
-					/* Esc [ 3 $ == Shift-Delete on urxvt. */
-					return SHIFT_DELETE;
-				if (length > 1 && seq[1] == '^')
-					/* Esc [ 3 ^ == Ctrl-Delete on urxvt. */
-					return CONTROL_DELETE;
-				if (length > 1 && seq[1] == '@')
-					/* Esc [ 3 @ == Ctrl-Shift-Delete on urxvt. */
-					return controlshiftdelete;
-				if (length > 2 && seq[2] == '~')
-					/* Esc [ 3 n ~ == F17...F20 on some terminals. */
-					*consumed = 3;
-#endif
-				break;
-			case '4': /* Esc [ 4 ~ == End on VT220/VT320/
-					   * Linux console/xterm. */
-				if (length > 1 && seq[1] == '~')
-					return KEY_END;
-				break;
-			case '5': /* Esc [ 5 ~ == PageUp on VT220/VT320/
-					   * Linux console/xterm/Eterm/urxvt/Terminal */
-				if (length > 1 && seq[1] == '~')
-					return KEY_PPAGE;
-				else if (length > 3 && seq[1] == ';' && seq[3] == '~') {
-					*consumed = 4;
-#ifndef NANO_TINY
-					if (seq[2] == '2')
-						return shiftaltup;
-					if (seq[2] == '3')
-						return ALT_PAGEUP;
-#endif
-				}
-				break;
-			case '6': /* Esc [ 6 ~ == PageDown on VT220/VT320/
-					   * Linux console/xterm/Eterm/urxvt/Terminal */
-				if (length > 1 && seq[1] == '~')
-					return KEY_NPAGE;
-				else if (length > 3 && seq[1] == ';' && seq[3] == '~') {
-					*consumed = 4;
-#ifndef NANO_TINY
-					if (seq[2] == '2')
-						return shiftaltdown;
-					if (seq[2] == '3')
-						return ALT_PAGEDOWN;
-#endif
-				}
-				break;
-			case '7': /* Esc [ 7 ~ == Home on Eterm/rxvt;
-					   * Esc [ 7 $ == Shift-Home on Eterm/rxvt;
-					   * Esc [ 7 ^ == Control-Home on Eterm/rxvt;
-					   * Esc [ 7 @ == Shift-Control-Home on same. */
-				if (length > 1 && seq[1] == '~')
-					return KEY_HOME;
-				else if (length > 1 && seq[1] == '$')
-					return SHIFT_HOME;
-				else if (length > 1 && seq[1] == '^')
-					return CONTROL_HOME;
-#ifndef NANO_TINY
-				else if (length > 1 && seq[1] == '@')
-					return shiftcontrolhome;
-#endif
-				break;
-			case '8': /* Esc [ 8 ~ == End on Eterm/rxvt;
-					   * Esc [ 8 $ == Shift-End on Eterm/rxvt;
-					   * Esc [ 8 ^ == Control-End on Eterm/rxvt;
-					   * Esc [ 8 @ == Shift-Control-End on same. */
-				if (length > 1 && seq[1] == '~')
-					return KEY_END;
-				else if (length > 1 && seq[1] == '$')
-					return SHIFT_END;
-				else if (length > 1 && seq[1] == '^')
-					return CONTROL_END;
-#ifndef NANO_TINY
-				else if (length > 1 && seq[1] == '@')
-					return shiftcontrolend;
-#endif
-				break;
-			case '9': /* Esc [ 9 == Delete on Mach console. */
-				return KEY_DC;
-			case '@': /* Esc [ @ == Insert on Mach console. */
-				return KEY_IC;
-			case 'A': /* Esc [ A == Up on ANSI/VT220/Linux console/
-					   * FreeBSD console/Mach console/xterm/Eterm/
-					   * urxvt/Gnome and Xfce Terminal. */
-			case 'B': /* Esc [ B == Down on the same. */
-			case 'C': /* Esc [ C == Right on the same. */
-			case 'D': /* Esc [ D == Left on the same. */
-				return arrow_from_ABCD(seq[0]);
-			case 'F': /* Esc [ F == End on FreeBSD console/Eterm. */
-				return KEY_END;
-			case 'G': /* Esc [ G == PageDown on FreeBSD console. */
-				return KEY_NPAGE;
-			case 'H': /* Esc [ H == Home on ANSI/VT220/FreeBSD
-					   * console/Mach console/Eterm. */
+	if (seq[0] < '9')
+		*consumed = 2;
+	switch (seq[0]) {
+		case '1':
+			if (length > 1 && seq[1] == '~')
+				/* Esc [ 1 ~ == Home on VT320/Linux console. */
 				return KEY_HOME;
-			case 'I': /* Esc [ I == PageUp on FreeBSD console. */
-				return KEY_PPAGE;
-			case 'L': /* Esc [ L == Insert on ANSI/FreeBSD console. */
-				return KEY_IC;
-			case 'M': /* Esc [ M == F1 on FreeBSD console. */
-				return KEY_F(1);
-			case 'N': /* Esc [ N == F2 on FreeBSD console. */
-				return KEY_F(2);
-			case 'O':
-				if (length > 1) {
-					*consumed = 2;
-					if ('O' < seq[1] && seq[1] < 'T')
-						/* Esc [ O P == F1 on xterm. */
-						/* Esc [ O Q == F2 on xterm. */
-						/* Esc [ O R == F3 on xterm. */
-						/* Esc [ O S == F4 on xterm. */
-						return KEY_F(seq[1] - 'O');
-				} else
-					/* Esc [ O == F3 on FreeBSD console. */
-					return KEY_F(3);
-				break;
-			case 'P': /* Esc [ P == F4 on FreeBSD console. */
-			case 'Q': /* Esc [ Q == F5 on FreeBSD console. */
-			case 'R': /* Esc [ R == F6 on FreeBSD console. */
-			case 'S': /* Esc [ S == F7 on FreeBSD console. */
-			case 'T': /* Esc [ T == F8 on FreeBSD console. */
-				return KEY_F(4 + seq[0] - 'P');
-			case 'U': /* Esc [ U == PageDown on Mach console. */
-				return KEY_NPAGE;
-			case 'V': /* Esc [ V == PageUp on Mach console. */
-				return KEY_PPAGE;
-			case 'W': /* Esc [ W == F11 on FreeBSD console. */
-				return KEY_F(11);
-			case 'X': /* Esc [ X == F12 on FreeBSD console. */
-				return KEY_F(12);
-			case 'Y': /* Esc [ Y == End on Mach console. */
-				return KEY_END;
-			case 'Z': /* Esc [ Z == Shift-Tab on ANSI/Linux console/
-					   * FreeBSD console/xterm/rxvt/Terminal. */
-				return SHIFT_TAB;
-			case 'a': /* Esc [ a == Shift-Up on rxvt/Eterm. */
-			case 'b': /* Esc [ b == Shift-Down on rxvt/Eterm. */
-			case 'c': /* Esc [ c == Shift-Right on rxvt/Eterm. */
-			case 'd': /* Esc [ d == Shift-Left on rxvt/Eterm. */
-				shift_held = TRUE;
-				return arrow_from_ABCD(seq[0] - 0x20);
-			case '[':
-				if (length > 1) {
-					*consumed = 2;
-					if ('@' < seq[1] && seq[1] < 'F')
-						/* Esc [ [ A == F1 on Linux console. */
-						/* Esc [ [ B == F2 on Linux console. */
-						/* Esc [ [ C == F3 on Linux console. */
-						/* Esc [ [ D == F4 on Linux console. */
-						/* Esc [ [ E == F5 on Linux console. */
-						return KEY_F(seq[1] - '@');
+			else if (length > 2 && seq[2] == '~') {
+				*consumed = 3;
+				switch (seq[1]) {
+					case '1': /* Esc [ 1 1 ~ == F1 on rxvt/Eterm. */
+					case '2': /* Esc [ 1 2 ~ == F2 on rxvt/Eterm. */
+					case '3': /* Esc [ 1 3 ~ == F3 on rxvt/Eterm. */
+					case '4': /* Esc [ 1 4 ~ == F4 on rxvt/Eterm. */
+					case '5': /* Esc [ 1 5 ~ == F5 on xterm/rxvt/Eterm. */
+						return KEY_F(seq[1] - '0');
+					case '7': /* Esc [ 1 7 ~ == F6 on VT220/VT320/
+							   * Linux console/xterm/rxvt/Eterm. */
+					case '8': /* Esc [ 1 8 ~ == F7 on the same. */
+					case '9': /* Esc [ 1 9 ~ == F8 on the same. */
+						return KEY_F(seq[1] - '1');
 				}
-				break;
-		}
+			} else if (length > 3 && seq[1] == ';') {
+				*consumed = 4;
+				switch (seq[2]) {
+					case '2':
+						switch (seq[3]) {
+							case 'A': /* Esc [ 1 ; 2 A == Shift-Up on xterm. */
+							case 'B': /* Esc [ 1 ; 2 B == Shift-Down on xterm. */
+							case 'C': /* Esc [ 1 ; 2 C == Shift-Right on xterm. */
+							case 'D': /* Esc [ 1 ; 2 D == Shift-Left on xterm. */
+								shift_held = TRUE;
+								return arrow_from_ABCD(seq[3]);
+#ifndef NANO_TINY
+							case 'F': /* Esc [ 1 ; 2 F == Shift-End on xterm. */
+								return SHIFT_END;
+							case 'H': /* Esc [ 1 ; 2 H == Shift-Home on xterm. */
+								return SHIFT_HOME;
+#endif
+						}
+						break;
+#ifndef NANO_TINY
+					case '9': /* To accommodate iTerm2 in "xterm mode". */
+					case '3':
+						switch (seq[3]) {
+							case 'A': /* Esc [ 1 ; 3 A == Alt-Up on xterm. */
+								return ALT_UP;
+							case 'B': /* Esc [ 1 ; 3 B == Alt-Down on xterm. */
+								return ALT_DOWN;
+							case 'C': /* Esc [ 1 ; 3 C == Alt-Right on xterm. */
+								return ALT_RIGHT;
+							case 'D': /* Esc [ 1 ; 3 D == Alt-Left on xterm. */
+								return ALT_LEFT;
+						}
+						break;
+					case '4':
+						/* When the arrow keys are held together with Shift+Meta,
+						 * act as if they are Home/End/PgUp/PgDown with Shift. */
+						switch (seq[3]) {
+							case 'A': /* Esc [ 1 ; 4 A == Shift-Alt-Up on xterm. */
+								return SHIFT_PAGEUP;
+							case 'B': /* Esc [ 1 ; 4 B == Shift-Alt-Down on xterm. */
+								return SHIFT_PAGEDOWN;
+							case 'C': /* Esc [ 1 ; 4 C == Shift-Alt-Right on xterm. */
+								return SHIFT_END;
+							case 'D': /* Esc [ 1 ; 4 D == Shift-Alt-Left on xterm. */
+								return SHIFT_HOME;
+						}
+						break;
+#endif
+					case '5':
+						switch (seq[3]) {
+							case 'A': /* Esc [ 1 ; 5 A == Ctrl-Up on xterm. */
+								return CONTROL_UP;
+							case 'B': /* Esc [ 1 ; 5 B == Ctrl-Down on xterm. */
+								return CONTROL_DOWN;
+							case 'C': /* Esc [ 1 ; 5 C == Ctrl-Right on xterm. */
+								return CONTROL_RIGHT;
+							case 'D': /* Esc [ 1 ; 5 D == Ctrl-Left on xterm. */
+								return CONTROL_LEFT;
+							case 'F': /* Esc [ 1 ; 5 F == Ctrl-End on xterm. */
+								return CONTROL_END;
+							case 'H': /* Esc [ 1 ; 5 H == Ctrl-Home on xterm. */
+								return CONTROL_HOME;
+						}
+						break;
+#ifndef NANO_TINY
+					case '6':
+						switch (seq[3]) {
+							case 'A': /* Esc [ 1 ; 6 A == Shift-Ctrl-Up on xterm. */
+								return shiftcontrolup;
+							case 'B': /* Esc [ 1 ; 6 B == Shift-Ctrl-Down on xterm. */
+								return shiftcontroldown;
+							case 'C': /* Esc [ 1 ; 6 C == Shift-Ctrl-Right on xterm. */
+								return shiftcontrolright;
+							case 'D': /* Esc [ 1 ; 6 D == Shift-Ctrl-Left on xterm. */
+								return shiftcontrolleft;
+							case 'F': /* Esc [ 1 ; 6 F == Shift-Ctrl-End on xterm. */
+								return shiftcontrolend;
+							case 'H': /* Esc [ 1 ; 6 H == Shift-Ctrl-Home on xterm. */
+								return shiftcontrolhome;
+						}
+						break;
+#endif
+				}
+			} else if (length > 4 && seq[2] == ';' && seq[4] == '~')
+				/* Esc [ 1 n ; 2 ~ == F17...F20 on some terminals. */
+				*consumed = 5;
+#ifdef USE_SLANG
+			else if (length == 3 && seq[2] == ';')
+				/* Discard broken sequences that Slang produces. */
+				*consumed = 3;
+#endif
+			break;
+		case '2':
+			if (length > 2 && seq[2] == '~') {
+				*consumed = 3;
+				switch (seq[1]) {
+					case '0': /* Esc [ 2 0 ~ == F9 on VT220/VT320/
+							   * Linux console/xterm/rxvt/Eterm. */
+						return KEY_F(9);
+					case '1': /* Esc [ 2 1 ~ == F10 on the same. */
+						return KEY_F(10);
+					case '3': /* Esc [ 2 3 ~ == F11 on the same. */
+						return KEY_F(11);
+					case '4': /* Esc [ 2 4 ~ == F12 on the same. */
+						return KEY_F(12);
+				}
+			} else if (length > 1 && seq[1] == '~')
+				/* Esc [ 2 ~ == Insert on VT220/VT320/
+				 * Linux console/xterm/Terminal. */
+				return KEY_IC;
+			else if (length > 3 && seq[1] == ';' && seq[3] == '~') {
+				/* Esc [ 2 ; x ~ == modified Insert on xterm. */
+				*consumed = 4;
+#ifndef NANO_TINY
+				if (seq[2] == '3')
+					return ALT_INSERT;
+#endif
+			}
+			else if (length > 4 && seq[2] == ';' && seq[4] == '~')
+				/* Esc [ 2 n ; 2 ~ == F21...F24 on some terminals. */
+				*consumed = 5;
+#ifdef USE_SLANG
+			else if (length == 3 && seq[2] == ';')
+				/* Discard broken sequences that Slang produces. */
+				*consumed = 3;
+#endif
+#ifndef NANO_TINY
+			else if (length > 3 && seq[1] == '0' && seq[3] == '~') {
+				/* Esc [ 2 0 0 ~ == start of a bracketed paste,
+				 * Esc [ 2 0 1 ~ == end of a bracketed paste. */
+				*consumed = 4;
+				if (seq[2] == '0') {
+					bracketed_paste = TRUE;
+					return BRACKETED_PASTE_MARKER;
+				} else if (seq[2] == '1') {
+					bracketed_paste = FALSE;
+					return BRACKETED_PASTE_MARKER;
+				}
+			}
+#endif
+			break;
+		case '3': /* Esc [ 3 ~ == Delete on VT220/VT320/
+				   * Linux console/xterm/Terminal. */
+			if (length > 1 && seq[1] == '~')
+				return KEY_DC;
+			if (length > 3 && seq[1] == ';' && seq[3] == '~') {
+				*consumed = 4;
+#ifndef NANO_TINY
+				if (seq[2] == '2')
+					/* Esc [ 3 ; 2 ~ == Shift-Delete on xterm/Terminal. */
+					return SHIFT_DELETE;
+				if (seq[2] == '3')
+					/* Esc [ 3 ; 3 ~ == Alt-Delete on xterm/rxvt/Eterm/Terminal. */
+					return ALT_DELETE;
+				if (seq[2] == '5')
+					/* Esc [ 3 ; 5 ~ == Ctrl-Delete on xterm. */
+					return CONTROL_DELETE;
+				if (seq[2] == '6')
+					/* Esc [ 3 ; 6 ~ == Ctrl-Shift-Delete on xterm. */
+					return controlshiftdelete;
+#endif
+			}
+#ifndef NANO_TINY
+			if (length > 1 && seq[1] == '$')
+				/* Esc [ 3 $ == Shift-Delete on urxvt. */
+				return SHIFT_DELETE;
+			if (length > 1 && seq[1] == '^')
+				/* Esc [ 3 ^ == Ctrl-Delete on urxvt. */
+				return CONTROL_DELETE;
+			if (length > 1 && seq[1] == '@')
+				/* Esc [ 3 @ == Ctrl-Shift-Delete on urxvt. */
+				return controlshiftdelete;
+			if (length > 2 && seq[2] == '~')
+				/* Esc [ 3 n ~ == F17...F20 on some terminals. */
+				*consumed = 3;
+#endif
+			break;
+		case '4': /* Esc [ 4 ~ == End on VT220/VT320/
+				   * Linux console/xterm. */
+			if (length > 1 && seq[1] == '~')
+				return KEY_END;
+			break;
+		case '5': /* Esc [ 5 ~ == PageUp on VT220/VT320/
+				   * Linux console/xterm/Eterm/urxvt/Terminal */
+			if (length > 1 && seq[1] == '~')
+				return KEY_PPAGE;
+			else if (length > 3 && seq[1] == ';' && seq[3] == '~') {
+				*consumed = 4;
+#ifndef NANO_TINY
+				if (seq[2] == '2')
+					return shiftaltup;
+				if (seq[2] == '3')
+					return ALT_PAGEUP;
+#endif
+			}
+			break;
+		case '6': /* Esc [ 6 ~ == PageDown on VT220/VT320/
+				   * Linux console/xterm/Eterm/urxvt/Terminal */
+			if (length > 1 && seq[1] == '~')
+				return KEY_NPAGE;
+			else if (length > 3 && seq[1] == ';' && seq[3] == '~') {
+				*consumed = 4;
+#ifndef NANO_TINY
+				if (seq[2] == '2')
+					return shiftaltdown;
+				if (seq[2] == '3')
+					return ALT_PAGEDOWN;
+#endif
+			}
+			break;
+		case '7': /* Esc [ 7 ~ == Home on Eterm/rxvt;
+				   * Esc [ 7 $ == Shift-Home on Eterm/rxvt;
+				   * Esc [ 7 ^ == Control-Home on Eterm/rxvt;
+				   * Esc [ 7 @ == Shift-Control-Home on same. */
+			if (length > 1 && seq[1] == '~')
+				return KEY_HOME;
+			else if (length > 1 && seq[1] == '$')
+				return SHIFT_HOME;
+			else if (length > 1 && seq[1] == '^')
+				return CONTROL_HOME;
+#ifndef NANO_TINY
+			else if (length > 1 && seq[1] == '@')
+				return shiftcontrolhome;
+#endif
+			break;
+		case '8': /* Esc [ 8 ~ == End on Eterm/rxvt;
+				   * Esc [ 8 $ == Shift-End on Eterm/rxvt;
+				   * Esc [ 8 ^ == Control-End on Eterm/rxvt;
+				   * Esc [ 8 @ == Shift-Control-End on same. */
+			if (length > 1 && seq[1] == '~')
+				return KEY_END;
+			else if (length > 1 && seq[1] == '$')
+				return SHIFT_END;
+			else if (length > 1 && seq[1] == '^')
+				return CONTROL_END;
+#ifndef NANO_TINY
+			else if (length > 1 && seq[1] == '@')
+				return shiftcontrolend;
+#endif
+			break;
+		case '9': /* Esc [ 9 == Delete on Mach console. */
+			return KEY_DC;
+		case '@': /* Esc [ @ == Insert on Mach console. */
+			return KEY_IC;
+		case 'A': /* Esc [ A == Up on ANSI/VT220/Linux console/
+				   * FreeBSD console/Mach console/xterm/Eterm/
+				   * urxvt/Gnome and Xfce Terminal. */
+		case 'B': /* Esc [ B == Down on the same. */
+		case 'C': /* Esc [ C == Right on the same. */
+		case 'D': /* Esc [ D == Left on the same. */
+			return arrow_from_ABCD(seq[0]);
+		case 'F': /* Esc [ F == End on FreeBSD console/Eterm. */
+			return KEY_END;
+		case 'G': /* Esc [ G == PageDown on FreeBSD console. */
+			return KEY_NPAGE;
+		case 'H': /* Esc [ H == Home on ANSI/VT220/FreeBSD
+				   * console/Mach console/Eterm. */
+			return KEY_HOME;
+		case 'I': /* Esc [ I == PageUp on FreeBSD console. */
+			return KEY_PPAGE;
+		case 'L': /* Esc [ L == Insert on ANSI/FreeBSD console. */
+			return KEY_IC;
+		case 'M': /* Esc [ M == F1 on FreeBSD console. */
+			return KEY_F(1);
+		case 'N': /* Esc [ N == F2 on FreeBSD console. */
+			return KEY_F(2);
+		case 'O':
+			if (length > 1) {
+				*consumed = 2;
+				if ('O' < seq[1] && seq[1] < 'T')
+					/* Esc [ O P == F1 on xterm. */
+					/* Esc [ O Q == F2 on xterm. */
+					/* Esc [ O R == F3 on xterm. */
+					/* Esc [ O S == F4 on xterm. */
+					return KEY_F(seq[1] - 'O');
+			} else
+				/* Esc [ O == F3 on FreeBSD console. */
+				return KEY_F(3);
+			break;
+		case 'P': /* Esc [ P == F4 on FreeBSD console. */
+		case 'Q': /* Esc [ Q == F5 on FreeBSD console. */
+		case 'R': /* Esc [ R == F6 on FreeBSD console. */
+		case 'S': /* Esc [ S == F7 on FreeBSD console. */
+		case 'T': /* Esc [ T == F8 on FreeBSD console. */
+			return KEY_F(4 + seq[0] - 'P');
+		case 'U': /* Esc [ U == PageDown on Mach console. */
+			return KEY_NPAGE;
+		case 'V': /* Esc [ V == PageUp on Mach console. */
+			return KEY_PPAGE;
+		case 'W': /* Esc [ W == F11 on FreeBSD console. */
+			return KEY_F(11);
+		case 'X': /* Esc [ X == F12 on FreeBSD console. */
+			return KEY_F(12);
+		case 'Y': /* Esc [ Y == End on Mach console. */
+			return KEY_END;
+		case 'Z': /* Esc [ Z == Shift-Tab on ANSI/Linux console/
+				   * FreeBSD console/xterm/rxvt/Terminal. */
+			return SHIFT_TAB;
+		case 'a': /* Esc [ a == Shift-Up on rxvt/Eterm. */
+		case 'b': /* Esc [ b == Shift-Down on rxvt/Eterm. */
+		case 'c': /* Esc [ c == Shift-Right on rxvt/Eterm. */
+		case 'd': /* Esc [ d == Shift-Left on rxvt/Eterm. */
+			shift_held = TRUE;
+			return arrow_from_ABCD(seq[0] - 0x20);
+		case '[':
+			if (length > 1) {
+				*consumed = 2;
+				if ('@' < seq[1] && seq[1] < 'F')
+					/* Esc [ [ A == F1 on Linux console. */
+					/* Esc [ [ B == F2 on Linux console. */
+					/* Esc [ [ C == F3 on Linux console. */
+					/* Esc [ [ D == F4 on Linux console. */
+					/* Esc [ [ E == F5 on Linux console. */
+					return KEY_F(seq[1] - '@');
+			}
+			break;
+	}
 
 	return FOREIGN_SEQUENCE;
 }