From 6643842bad2e0ed9f9249f2039d2a30c3b7fb38d Mon Sep 17 00:00:00 2001
From: Pádraig Brady <P@draigBrady.com>
Date: Tue, 6 Sep 2016 15:13:32 +0100
Subject: factor: reinstate immediate output with interactive use

* src/factor.c (lbuf_putc): Only buffer more than a line
when not using the tool interactively.
* NEWS: Mention the bug fix.
Fixes http://pad.lv/1620139
---
 src/factor.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/factor.c')

diff --git a/src/factor.c b/src/factor.c
index 8fee75912..ff454b485 100644
--- a/src/factor.c
+++ b/src/factor.c
@@ -2379,7 +2379,13 @@ lbuf_putc (char c)
     {
       size_t buffered = lbuf.end - lbuf.buf;
 
-      if (buffered >= FACTOR_PIPE_BUF)
+      /* Provide immediate output for interactive input.  */
+      static int line_buffered = -1;
+      if (line_buffered == -1)
+        line_buffered = isatty (STDIN_FILENO);
+      if (line_buffered)
+        lbuf_flush ();
+      else if (buffered >= FACTOR_PIPE_BUF)
         {
           /* Write output in <= PIPE_BUF chunks
              so consumers can read atomically.  */
-- 
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