From: Ben Pfaff <blp@cs.stanford.edu>
Date: Thu, 3 Jun 2010 05:02:42 +0000 (-0700)
Subject: pspp: Add --no-output option to allow entirely disabling output.
X-Git-Tag: sav-api~203
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?p=pspp;a=commitdiff_plain;h=d01297fc4e5e2c48ca66c00cd78569217a5b5bc1

pspp: Add --no-output option to allow entirely disabling output.
---

diff --git a/doc/invoking.texi b/doc/invoking.texi
index 830d176463..be89ace610 100644
--- a/doc/invoking.texi
+++ b/doc/invoking.texi
@@ -41,6 +41,7 @@ corresponding short options.
 -O @var{option}=@var{value}
 -O format=@var{format}
 -O device=@{terminal|listing@}
+--no-output
 -e, --error-file=@var{error-file}
 @end example
 
@@ -106,6 +107,11 @@ SET command's output routing subcommands (@pxref{SET}).  By default,
 output written to standard output is considered a terminal device and
 other output is considered a listing device.
 
+@item --no-output
+Disables output entirely, if neither @option{-o} nor @option{-O} is
+also used.  If one of those options is used, @option{--no-output} has
+no effect.
+
 @item -e @var{error-file}
 @itemx --error-file=@var{error-file}
 Configures a file to receive PSPP error, warning, and note messages in
diff --git a/src/ui/terminal/terminal-opts.c b/src/ui/terminal/terminal-opts.c
index d1296a3625..306ebe1523 100644
--- a/src/ui/terminal/terminal-opts.c
+++ b/src/ui/terminal/terminal-opts.c
@@ -68,6 +68,7 @@ enum
     OPT_ERROR_FILE,
     OPT_OUTPUT,
     OPT_OUTPUT_OPTION,
+    OPT_NO_OUTPUT,
     OPT_INTERACTIVE,
     OPT_NO_STATRC,
     OPT_HELP,
@@ -81,6 +82,7 @@ static struct argv_option terminal_argv_options[N_TERMINAL_OPTIONS] =
     {"error-file", 'e', required_argument, OPT_ERROR_FILE},
     {"output", 'o', required_argument, OPT_OUTPUT},
     {NULL, 'O', required_argument, OPT_OUTPUT_OPTION},
+    {"no-output", 0, no_argument, OPT_NO_OUTPUT},
     {"interactive", 'i', no_argument, OPT_INTERACTIVE},
     {"no-statrc", 'r', no_argument, OPT_NO_STATRC},
     {"help", 'h', no_argument, OPT_HELP},
@@ -195,6 +197,7 @@ Output options:\n\
   -O OPTION=VALUE           set output option to customize previous -o\n\
   -O device={terminal|listing}  override device type for previous -o\n\
   -e, --error-file=FILE     append errors, warnings, and notes to FILE\n\
+  --no-output               disable default output driver\n\
 Supported output formats: %s\n\
 \n\
 Language options:\n\
@@ -249,6 +252,12 @@ terminal_option_callback (int id, void *to_)
       parse_output_option (to, optarg);
       break;
 
+    case OPT_NO_OUTPUT:
+      /* Pretend that we already have an output driver, which disables adding
+         one in terminal_opts_done() when we don't already have one. */
+      to->has_output_driver = true;
+      break;
+
     case OPT_INTERACTIVE:
       to->syntax_mode = GETL_INTERACTIVE;
       break;