From ce6020f1f8248050bb17699cc229205e8cdbdf4e Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Fri, 17 Feb 2012 23:35:57 -0800
Subject: Reimplementation of how TXR decides whether to dump bindings or not.
 This is now done right inside the standard output stream.

* match.c (output_produced): Variable removed.
(complex_open): Assignment to output_produced removed.

* stream.c (output_produced): New global variable.
(stdio_put_string, stdio_put_char): Set output_produced
to t if the target of the output is stdout.

* stream.h (output_produced): Declared.

* txr.h (output_produced): Declaration removed.
---
 ChangeLog | 16 ++++++++++++++++
 match.c   |  2 --
 stream.c  |  6 ++++++
 stream.h  |  1 +
 txr.h     |  1 -
 5 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index eda56c02..7a63e83d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,19 @@
+2012-02-17  Kaz Kylheku  <kaz@kylheku.com>
+
+	Reimplementation of how TXR decides whether to dump bindings
+	or not. This is now done right inside the standard output stream.
+
+	* match.c (output_produced): Variable removed.
+	(complex_open): Assignment to output_produced removed.
+
+	* stream.c (output_produced): New global variable.
+	(stdio_put_string, stdio_put_char): Set output_produced
+	to t if the target of the output is stdout.
+
+	* stream.h (output_produced): Declared.
+
+	* txr.h (output_produced): Declaration removed.
+
 2012-02-17  Kaz Kylheku  <kaz@kylheku.com>
 
 	* eval.c (dwim_loc): 2012-02-13 fix didn't do it. 
diff --git a/match.c b/match.c
index b5e489dd..d921757e 100644
--- a/match.c
+++ b/match.c
@@ -47,7 +47,6 @@
 #include "eval.h"
 #include "match.h"
 
-int output_produced;
 int opt_nobindings = 0;
 int opt_lisp_bindings = 0;
 int opt_arraydims = 1;
@@ -1459,7 +1458,6 @@ static fpip_t complex_open(val name, val output, val append)
   if (!wcscmp(namestr, L"-")) {
     ret.close = fpip_fclose;
     ret.f = output ? stdout : stdin;
-    output_produced = output ? 1 : 0;
   } else if (namestr[0] == '!') {
     ret.close = fpip_pclose;
     ret.f = w_popen(namestr+1, output ? L"w" : L"r");
diff --git a/stream.c b/stream.c
index 023e8390..64380b87 100644
--- a/stream.c
+++ b/stream.c
@@ -45,6 +45,7 @@
 #include "utf8.h"
 
 val std_input, std_output, std_error;
+val output_produced;
 
 struct strm_ops {
   struct cobj_ops cobj_ops;
@@ -124,6 +125,9 @@ static val stdio_put_string(val stream, val str)
 {
   struct stdio_handle *h = (struct stdio_handle *) stream->co.handle;
 
+  if (h->f == stdout)
+    output_produced = t;
+
   if (h->f != 0) {
     const wchar_t *s = c_str(str);
     while (*s) {
@@ -138,6 +142,8 @@ static val stdio_put_string(val stream, val str)
 static val stdio_put_char(val stream, val ch)
 {
   struct stdio_handle *h = (struct stdio_handle *) stream->co.handle;
+  if (h->f == stdout)
+    output_produced = t;
   return h->f != 0 && utf8_encode(c_chr(ch), stdio_put_char_callback, (mem_t *) h->f)
          ? t : stdio_maybe_write_error(stream);
 }
diff --git a/stream.h b/stream.h
index 14208f7a..4cb7f923 100644
--- a/stream.h
+++ b/stream.h
@@ -25,6 +25,7 @@
  */
 
 extern val std_input, std_output, std_error;
+extern val output_produced;
 
 val make_stdio_stream(FILE *, val descr, val input, val output);
 val make_pipe_stream(FILE *, val descr, val input, val output);
diff --git a/txr.h b/txr.h
index 23afc823..293840a1 100644
--- a/txr.h
+++ b/txr.h
@@ -35,4 +35,3 @@ extern int opt_vg_debug;
 extern int opt_derivative_regex;
 extern const wchli_t *version;
 extern const wchar_t *progname;
-extern int output_produced;
-- 
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