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-rw-r--r--usr.bin/ncal/ncal.12
-rw-r--r--usr.bin/ncal/ncal.c3
2 files changed, 4 insertions, 1 deletions
diff --git a/usr.bin/ncal/ncal.1 b/usr.bin/ncal/ncal.1
index 8429906..bd3b71c 100644
--- a/usr.bin/ncal/ncal.1
+++ b/usr.bin/ncal/ncal.1
@@ -171,6 +171,8 @@ that, two after that and the whole year.
will warn about these combinations.
.Pp
A year starts on January 1.
+.P
+Highlighting of dates is disabled if stdout is not a tty.
.Sh SEE ALSO
.Xr calendar 3 ,
.Xr strftime 3
diff --git a/usr.bin/ncal/ncal.c b/usr.bin/ncal/ncal.c
index 44e31fe..2ca770a 100644
--- a/usr.bin/ncal/ncal.c
+++ b/usr.bin/ncal/ncal.c
@@ -822,7 +822,8 @@ mkmonthr(int y, int m, int jd_flag, struct monthlines *mlines)
dt.d = j - jan1 + 1;
else
sdater(j, &dt);
- if (j == highlightdate && !flag_nohighlight)
+ if (j == highlightdate && !flag_nohighlight
+ && isatty(STDOUT_FILENO))
highlight(mlines->lines[i] + k,
ds + dt.d * dw, dw, &l);
else
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