New option -u / --suppress-output to emacsclient

* lib-src/emacsclient.c (print_help_and_exit, longopts)
(decode_options, main): Implement new option --suppress-output / -u to
suppress printing of eval-results.
* doc/emacs/misc.texi (emacsclient Options): Document the new
"--suppress-output/-u" options.
* etc/NEWS: Mention the new options.

1 files changed, 26 insertions, 11 deletions

diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 70709ecec04..7b735dfb05d 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -118,6 +118,9 @@ int nowait = 0;
 /* Nonzero means don't print messages for successful operations.  --quiet.  */
 int quiet = 0;
 
+/* Nonzero means don't print values returned from emacs. --suppress-output.  */
+int suppress_output = 0;
+
 /* Nonzero means args are expressions to be evaluated.  --eval.  */
 int eval = 0;
 
@@ -160,6 +163,7 @@ struct option longopts[] =
 {
   { "no-wait",  no_argument,       NULL, 'n' },
   { "quiet",    no_argument,       NULL, 'q' },
+  { "suppress-output", no_argument, NULL, 'u' },
   { "eval",     no_argument,       NULL, 'e' },
   { "help",     no_argument,       NULL, 'H' },
   { "version",  no_argument,       NULL, 'V' },
@@ -469,9 +473,9 @@ decode_options (int argc, char **argv)
     {
       int opt = getopt_long_only (argc, argv,
 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
-                             "VHneqa:s:f:d:F:tc",
+                             "VHnequa:s:f:d:F:tc",
 #else
-                             "VHneqa:f:d:F:tc",
+                             "VHnequa:f:d:F:tc",
 #endif
                              longopts, 0);
 
@@ -519,6 +523,10 @@ decode_options (int argc, char **argv)
           quiet = 1;
           break;
 
+        case 'u':
+          suppress_output = 1;
+          break;
+
         case 'V':
           message (false, "emacsclient %s\n", VERSION);
           exit (EXIT_SUCCESS);
@@ -631,6 +639,7 @@ The following OPTIONS are accepted:\n\
 -e, --eval              Evaluate the FILE arguments as ELisp expressions\n\
 -n, --no-wait           Don't wait for the server to return\n\
 -q, --quiet             Don't display messages on success\n\
+-u, --suppress-output   Don't display return values from the server\n\
 -d DISPLAY, --display=DISPLAY\n\
                         Visit the file in the given display\n\
 ", "\
@@ -1860,19 +1869,25 @@ main (int argc, char **argv)
           else if (strprefix ("-print ", p))
             {
               /* -print STRING: Print STRING on the terminal. */
-              str = unquote_argument (p + strlen ("-print "));
-              if (needlf)
-                printf ("\n");
-              printf ("%s", str);
-              needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
-            }
+              if (!suppress_output)
+                {
+                  str = unquote_argument (p + strlen ("-print "));
+                  if (needlf)
+                    printf ("\n");
+                  printf ("%s", str);
+                  needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
+                }
+            }
           else if (strprefix ("-print-nonl ", p))
             {
               /* -print-nonl STRING: Print STRING on the terminal.
                  Used to continue a preceding -print command.  */
-              str = unquote_argument (p + strlen ("-print-nonl "));
-              printf ("%s", str);
-              needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
+              if (!suppress_output)
+                {
+                  str = unquote_argument (p + strlen ("-print-nonl "));
+                  printf ("%s", str);
+                  needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
+                }
             }
           else if (strprefix ("-error ", p))
             {