Making Ctrl+Left and Ctrl+Right work on more terminals by asking

ncurses for the keycodes.  This addresses Debian bug #800681.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5434 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2015-11-23  Benno Schulenberg  <bensberg@justemail.net>
+	* src/nano.c (main), src/winio.c (parse_kbinput): Make Ctrl+Left and
+	Ctrl+Right work on more terminals by asking ncurses for the keycodes.
+	This addresses Debian bug #800681 reported by Arturo Borrero González.
+
 2015-11-22  Benno Schulenberg  <bensberg@justemail.net>
 	* src/text.c (add_undo): Delete a condition that will never occur --
 	this function is only ever called with PASTE when cutbuffer != NULL.

src/global.c

@@ -41,6 +41,11 @@ bool func_key;
 bool focusing = FALSE;
 	/* Whether an update of the edit window should center the cursor. */
 
+#ifndef NANO_TINY
+int controlleft = CONTROL_LEFT;
+int controlright = CONTROL_RIGHT;
+#endif
+
 #ifndef DISABLE_WRAPJUSTIFY
 ssize_t fill = 0;
 	/* The column where we will wrap lines. */

src/nano.c

@@ -2712,6 +2712,14 @@ int main(int argc, char **argv)
     interface_color_pair[FUNCTION_TAG].bright = FALSE;
 #endif
 
+#if !defined(NANO_TINY) && !defined(USE_SLANG)
+    /* Ask ncurses for the key codes for Control+Left and Control+Right. */
+    if ((int)tigetstr("kLFT5") > 0)
+	controlleft = key_defined(tigetstr("kLFT5"));
+    if ((int)tigetstr("kRIT5") > 0)
+	controlright = key_defined(tigetstr("kRIT5"));
+#endif
+
 #ifdef DEBUG
     fprintf(stderr, "Main: open file\n");
 #endif

src/nano.h

@@ -548,10 +548,9 @@ enum
 #define NANO_CONTROL_7 31
 #define NANO_CONTROL_8 127
 
-/* Codes for "modified" Arrow keys.  Chosen like this because some
- * terminals produce them, and they are beyond KEY_MAX of ncurses. */
-#define CONTROL_LEFT 539
-#define CONTROL_RIGHT 554
+/* Codes for "modified" Arrow keys, beyond KEY_MAX of ncurses. */
+#define CONTROL_LEFT 0x401
+#define CONTROL_RIGHT 0x402
 
 #ifndef NANO_TINY
 /* An imaginary key for when we get a SIGWINCH (window resize). */

src/proto.h

@@ -35,6 +35,11 @@ extern bool meta_key;
 extern bool func_key;
 extern bool focusing;
 
+#ifndef NANO_TINY
+extern int controlleft;
+extern int controlright;
+#endif
+
 #ifndef DISABLE_WRAPJUSTIFY
 extern ssize_t fill;
 extern ssize_t wrap_at;

src/winio.c

@@ -634,16 +634,6 @@ int parse_kbinput(WINDOW *win)
 		retval = ERR;
 		break;
 #endif
-	    case CONTROL_LEFT:
-#ifndef NANO_TINY
-		retval = sc_seq_or(do_prev_word_void, 0);
-#endif
-		break;
-	    case CONTROL_RIGHT:
-#ifndef NANO_TINY
-		retval = sc_seq_or(do_next_word_void, 0);
-#endif
-		break;
 #ifndef NANO_TINY
 	    case KEY_WINCH:
 		retval = KEY_WINCH;
@@ -651,6 +641,13 @@ int parse_kbinput(WINDOW *win)
 #endif
 	}
 
+#ifndef NANO_TINY
+	if (retval == controlleft)
+	    retval = sc_seq_or(do_prev_word_void, 0);
+	else if (retval == controlright)
+	    retval = sc_seq_or(do_next_word_void, 0);
+#endif
+
 	/* If our result is an extended keypad value (i.e. a value
 	 * outside of byte range), set func_key to TRUE. */
 	if (retval != ERR)