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authorru <ru@FreeBSD.org>2011-06-03 14:34:38 +0000
committerru <ru@FreeBSD.org>2011-06-03 14:34:38 +0000
commitac14eff506609aa01adf3b7519861b7f6eb43c06 (patch)
tree4108d557e1262b98ba251da1b502b7dc79403dfc /usr.bin/man/man.1
parente43f9045296b6f5823d53836a7a651d2e678c070 (diff)
downloadFreeBSD-src-ac14eff506609aa01adf3b7519861b7f6eb43c06.zip
FreeBSD-src-ac14eff506609aa01adf3b7519861b7f6eb43c06.tar.gz
When MANCOLOR environment variable is set, enable ANSI color escapes
in grotty(1). This makes it possible to view colorized manpages in color. When MANPAGER environment variable is set, use it instead of PAGER. Why another environment variable, one might ask? With color output enabled, both a terminal and a pager should support the ANSI color escapes. On a supporting terminal, less(1) with option -R would be such a pager, while "more -s" (the current default pager for man(1)) will show garbage. It means a different default pager is needed when color output is enabled, but many people have PAGER set customary, and it's unlikely to support ANSI color escapes, so introducing yet another variable (MANPAGER) seemed like a good option to me: - if MANPAGER is set, use that unconditionally; - if you disable color support (it is by default), and don't set MANPAGER, you get an old behavior: -P pager, $PAGER, "more -s", in that order; - if you enable color support (by setting MANCOLOR), and don't set MANPAGER, we ignore PAGER which is unlikely to support ANSI color escapes, and you get: -P pager, "less -Rs", in that order; - you might have good reasons for different man(1) and general purpose pagers; - later versions of GNU man(1) support MANPAGER.
Diffstat (limited to 'usr.bin/man/man.1')
-rw-r--r--usr.bin/man/man.120
1 files changed, 17 insertions, 3 deletions
diff --git a/usr.bin/man/man.1 b/usr.bin/man/man.1
index 133d536..a9002ec 100644
--- a/usr.bin/man/man.1
+++ b/usr.bin/man/man.1
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd June 2, 2011
+.Dd June 3, 2011
.Dt MAN 1
.Os
.Sh NAME
@@ -73,8 +73,12 @@ environment variable.
.It Fl P Ar pager
Use specified pager.
Defaults to
+.Ic "less -sR"
+if color support is enabled, or
.Ic "more -s" .
Overrides the
+.Ev MANPAGER
+environment variable, which in turn overrides the
.Ev PAGER
environment variable.
.It Fl S Ar mansect
@@ -289,9 +293,19 @@ Otherwise, if set to a special value
.Dq Li tty ,
and output is to a terminal,
the pages may be displayed over the whole width of the screen.
-.It Ev PAGER
+.It Ev MANCOLOR
+If set, enables color support.
+.It Ev MANPAGER
Program used to display files.
-If unset,
+.Pp
+If unset, and color support is enabled,
+.Ic "less -sR"
+is used.
+.Pp
+If unset, and color support is disabled, then
+.Ev PAGER
+is used.
+If that has no value either,
.Ic "more -s"
is used.
.El
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