Default "box" option for ascii driver

[John Darrington]

The (ever increasingly misnamed) ascii driver supports unicode box characters, 
which are
must nicer than the ascii #==--- etc.  It would be good if more people knew 
about it.
Accordingly, I propose the following patch.

It causes the terminal user interface to start as if -O box=unicode had been 
given iff
1. No explicit "box" option was specified; AND
2. The encoding of the locale is UTF-8

condition 2 is not absolutely robust.   It doesn't guarantee that the terminal 
is
capable of displaying UTF8, but it should work under most environments.

Any objections?



diff --git a/src/ui/terminal/terminal-opts.c b/src/ui/terminal/terminal-opts.c
index 121d89d..95007a0 100644
--- a/src/ui/terminal/terminal-opts.c
+++ b/src/ui/terminal/terminal-opts.c
@@ -20,6 +20,8 @@
 
 #include <stdbool.h>
 #include <stdlib.h>
+#include <string.h>
+
 
 #include "data/settings.h"
 #include "data/file-name.h"
@@ -39,6 +41,7 @@
 #include "output/msglog.h"
 
 #include "gl/error.h"
+#include "gl/localcharset.h"
 #include "gl/progname.h"
 #include "gl/version-etc.h"
 #include "gl/xmemdup0.h"
@@ -302,6 +305,8 @@ terminal_opts_init (struct argv_parser *ap,
 void
 terminal_opts_done (struct terminal_opts *to, int argc, char *argv[])
 {
+      if (0 == strcmp (locale_charset (), "UTF-8"))
+        string_map_insert (&to->options, "box", "unicode");
   register_output_driver (to);


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