in parse_kbinput(), properly handle combined meta and escape sequences,

so that e.g. Meta-+ will work properly when the + is on the numeric
keypad and NumLock is off


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3805 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -131,6 +131,10 @@ CVS code -
 	- Remove the marking of the file as modified, as do_insertfile()
 	  now handles that. (DLR)
 - winio.c:
+  parse_kbinput()
+	- Properly handle combined meta and escape sequences, so that
+	  e.g. Meta-+ will work properly when the + is on the numeric
+	  keypad and NumLock is off. (DLR)
   display_string()
 	- Properly handle buf[start_index]'s being a null terminator.
 	  (DLR)

src/winio.c

@@ -505,19 +505,20 @@ int parse_kbinput(WINDOW *win, bool *meta_key, bool *func_key)
 		    }
 		    break;
 		case 1:
-		    /* One escape followed by a non-escape: escape
-		     * sequence mode.  Reset the escape counter.  If
-		     * there aren't any other keys waiting, we have a
-		     * meta key sequence, so set meta_key to TRUE and
-		     * save the lowercase version of the non-escape
-		     * character as the result.  If there are other keys
-		     * waiting, we have a true escape sequence, so
-		     * interpret it. */
+		    /* Reset the escape counter. */
 		    escapes = 0;
 		    if (get_key_buffer_len() == 0) {
+			/* One escape followed by a non-escape, and
+			 * there aren't any other keys waiting: meta key
+			 * sequence mode.  Set meta_key to TRUE and save
+			 * the lowercase version of the non-escape
+			 * character as the result. */
 			*meta_key = TRUE;
 			retval = tolower(*kbinput);
 		    } else {
+			/* One escape followed by a non-escape, and
+			 * there are other keys waiting: escape sequence
+			 * mode.  Interpret the escape sequence. */
 			bool ignore_seq;
 
 			retval = parse_escape_seq_kbinput(*kbinput,
@@ -533,18 +534,21 @@ int parse_kbinput(WINDOW *win, bool *meta_key, bool *func_key)
 		    }
 		    break;
 		case 2:
-		    /* Two escapes followed by one or more decimal
-		     * digits: byte sequence mode.  If the byte
-		     * sequence's range is limited to 2XX (the first
-		     * digit is in the '0' to '2' range and it's the
-		     * first digit, or it's in the '0' to '9' range and
-		     * it's not the first digit), increment the byte
-		     * sequence counter and interpret the digit.  If the
-		     * byte sequence's range is not limited to 2XX, fall
-		     * through. */
+		    if (get_key_buffer_len() == 0) {
 			if (('0' <= *kbinput && *kbinput <= '2' &&
 				byte_digits == 0) || ('0' <= *kbinput &&
 				*kbinput <= '9' && byte_digits > 0)) {
+			    /* Two escapes followed by one or more
+			     * decimal digits, and there aren't any
+			     * other keys waiting: byte sequence mode.
+			     * If the byte sequence's range is limited
+			     * to 2XX (the first digit is in the '0' to
+			     * '2' range and it's the first digit, or
+			     * it's in the '0' to '9' range and it's not
+			     * the first digit), increment the byte
+			     * sequence counter and interpret the digit.
+			     * If the byte sequence's range is not
+			     * limited to 2XX, fall through. */
 			    int byte;
 
 			    byte_digits++;
@@ -555,14 +559,15 @@ int parse_kbinput(WINDOW *win, bool *meta_key, bool *func_key)
 				int byte_mb_len, *seq, i;
 
 				/* If we've read in a complete byte
-			     * sequence, reset the byte sequence counter
-			     * and the escape counter, and put back the
-			     * corresponding byte value. */
-			    byte_digits = 0;
+				 * sequence, reset the escape counter
+				 * and the byte sequence counter, and
+				 * put back the corresponding byte
+				 * value. */
 				escapes = 0;
+				byte_digits = 0;
 
-			    /* Put back the multibyte equivalent of the
-			     * byte value. */
+				/* Put back the multibyte equivalent of
+				 * the byte value. */
 				byte_mb = make_mbchar((long)byte,
 					&byte_mb_len);
 
@@ -583,22 +588,44 @@ int parse_kbinput(WINDOW *win, bool *meta_key, bool *func_key)
 			    if (byte_digits == 0)
 				/* Two escapes followed by a non-decimal
 				 * digit or a decimal digit that would
-			     * create a byte sequence greater than 2XX,
-			     * and we're not in the middle of a byte
-			     * sequence: control character sequence
-			     * mode.  Interpret the control sequence and
-			     * save the corresponding control character
-			     * as the result. */
+				 * create a byte sequence greater than
+				 * 2XX, we're not in the middle of a
+				 * byte sequence, and there aren't any
+				 * other keys waiting: control character
+				 * sequence mode.  Interpret the control
+				 * sequence and save the corresponding
+				 * control character as the result. */
 				retval = get_control_kbinput(*kbinput);
 			    else {
 				/* If we're in the middle of a byte
-			     * sequence, reset the byte sequence counter
-			     * and save the character we got as the
-			     * result. */
+				 * sequence, reset the byte sequence
+				 * counter and save the character we got
+				 * as the result. */
 				byte_digits = 0;
 				retval = *kbinput;
 			    }
 			}
+		    } else {
+			/* Two escapes followed by a non-escape, and
+			 * there are other keys waiting: combined meta
+			 * and escape sequence mode.  Reset the escape
+			 * counter, set meta_key to TRUE, and interpret
+			 * the escape sequence. */
+			bool ignore_seq;
+
+			escapes = 0;
+			*meta_key = TRUE;
+			retval = parse_escape_seq_kbinput(*kbinput,
+				&ignore_seq);
+
+			/* If the escape sequence is unrecognized and
+			 * not ignored, throw it out. */
+			if (retval == ERR && !ignore_seq) {
+			    if (win == edit)
+				statusbar(_("Unknown Command"));
+			    beep();
+			}
+		    }
 		    break;
 	    }
     }