options: recognize -a and --atblanks on the command line

In nano, -a is only effective when also -$ is given, so this will
not conflict with Pico since Pico does not know the -$ option.

doc/nano.1

@@ -164,6 +164,10 @@ should be considered as part of a word.  This overrides option
 Specify the name of the syntax highlighting to use from among the ones
 defined in the \fInanorc\fP files.
 .TP
+.BR \-a ", " \-\-atblanks
+When doing soft line wrapping, wrap lines at whitespace
+instead of always at the edge of the screen.
+.TP
 .BR \-c ", " \-\-constantshow
 Constantly show the cursor position on the status bar.
 Note that this overrides option \fB\-U\fR (\fB\-\-quickblank\fR).
@@ -256,7 +260,7 @@ continuing it over multiple screen lines.  Since
 this option last when using other options (e.g.\& 'nano \-wS$') or pass it
 separately (e.g.\& 'nano \-wS \-$').
 .TP
-.BR \-a ", " \-b ", " \-e ", " \-f ", " \-j
+.BR \-b ", " \-e ", " \-f ", " \-j
 Ignored, for compatibility with Pico.
 
 .SH TOGGLES

doc/nano.texi

@@ -246,6 +246,11 @@ should be considered as parts of words.  This overrides option
 Specify the syntax to be used for highlighting.
 @xref{Syntax Highlighting} for more info.
 
+@item -a
+@itemx --atblanks
+When doing soft line wrapping, wrap lines at whitespace
+instead of always at the edge of the screen.
+
 @item -c
 @itemx --constantshow
 Constantly display the cursor position (line number, column number,
@@ -375,8 +380,7 @@ continuing it over multiple screen lines.  Since
 this option last when using other options (e.g.@: @code{nano -wS$}) or pass it
 separately (e.g.@: @code{nano -wS -$}).
 
-@item -a
-@itemx -b
+@item -b
 @itemx -e
 @itemx -f
 @itemx -j

src/nano.c

@@ -850,6 +850,9 @@ void usage(void)
     if (!ISSET(RESTRICTED))
 	print_opt(_("-Y <name>"), _("--syntax=<name>"),
 		N_("Syntax definition to use for coloring"));
+#endif
+#ifndef NANO_TINY
+    print_opt("-a", "--atblanks", N_("When soft-wrapping, do it at whitespace"));
 #endif
     print_opt("-c", "--constantshow", N_("Constantly show cursor position"));
     print_opt("-d", "--rebinddelete",
@@ -1972,6 +1975,7 @@ int main(int argc, char **argv)
 	{"smooth", 0, NULL, 'S'},
 	{"wordbounds", 0, NULL, 'W'},
 	{"wordchars", 1, NULL, 'X'},
+	{"atblanks", 0, NULL, 'a'},
 	{"autoindent", 0, NULL, 'i'},
 	{"cut", 0, NULL, 'k'},
 	{"unix", 0, NULL, 'u'},
@@ -2024,7 +2028,6 @@ int main(int argc, char **argv)
 		"ABC:DEFGHIKLNOPQ:RST:UVWX:Y:abcdefghijklmno:pqr:s:tuvwxz$",
 		long_options, NULL)) != -1) {
 	switch (optchr) {
-	    case 'a':
 	    case 'b':
 	    case 'e':
 	    case 'f':
@@ -2127,6 +2130,11 @@ int main(int argc, char **argv)
 	    case 'Y':
 		syntaxstr = mallocstrcpy(syntaxstr, optarg);
 		break;
+#endif
+#ifndef NANO_TINY
+	    case 'a':
+		SET(AT_BLANKS);
+		break;
 #endif
 	    case 'c':
 		SET(CONSTANT_SHOW);