tmac: introduce real manual reference macro instead of overloading IR

The overloading of IR emits magic \X'...' sequences that turn into HTML manual links.
But not all such IR invocations should be manual links;
those had to be written to avoid the IR macro before.
Worse, the \X'...' ending the IR causes troff to emit only a single space after a period.

Defining a new IM macro for manual references fixes both problems.

Fixes #441.

1 files changed, 12 insertions, 12 deletions

diff --git a/man/man1/mk.1 b/man/man1/mk.1
index 0698ef5b..4b5e94d4 100644
--- a/man/man1/mk.1
+++ b/man/man1/mk.1
@@ -29,7 +29,7 @@ contains a
 .I rule
 for each target that identifies the files and other
 targets upon which it depends and an
-.IR sh (1)
+.IM sh (1)
 script, a
 .IR recipe ,
 to update the target.
@@ -157,7 +157,7 @@ In the recipe of a meta-rule, the environment variable
 contains the string matched by the
 .BR % .
 For example, a meta-rule to compile a C program using
-.IR 9c (1)
+.IM 9c (1)
 might be:
 .IP
 .EX
@@ -207,7 +207,7 @@ References to variables are replaced by the variables' values.
 Special characters may be quoted using single quotes
 .BR \&''
 as in
-.IR sh (1).
+.IM sh (1) .
 .PP
 Assignments and rules are distinguished by
 the first unquoted occurrence of
@@ -246,7 +246,7 @@ A legal reference of the form
 or
 .B ${name}
 is expanded as in
-.IR sh (1).
+.IM sh (1) .
 A reference of the form
 .BI ${name: A % B = C\fL%\fID\fL}\fR,
 where
@@ -315,9 +315,9 @@ or
 .BR rcsh ,
 .I mk
 uses
-.IR rc (1)'s
+.IM rc (1) 's
 quoting rules; otherwise it uses
-.IR sh (1)'s.
+.IM sh (1) 's.
 The
 .B MKSHELL
 variable is consulted when the mkfile is read, not when it is executed,
@@ -523,7 +523,7 @@ of the aggregate
 Currently, the only aggregates supported are
 .I 9ar
 (see
-.IR 9c (1))
+.IM 9c (1) )
 archives.
 .SS Attributes
 The colon separating the target from the prerequisites
@@ -567,12 +567,12 @@ In the rule,
 .B %
 has no special meaning.
 The target is interpreted as a regular expression as defined in
-.IR regexp (7).
+.IM regexp (7) .
 The prerequisites may contain references
 to subexpressions in form
 .BI \e n\f1,
 as in the substitute command of
-.IR sed (1).
+.IM sed (1) .
 .TP
 .B U
 The targets are considered to have been updated
@@ -625,7 +625,7 @@ Regular expression meta-rules:
 .EE
 .PP
 A correct way to deal with
-.IR yacc (1)
+.IM yacc (1)
 grammars.
 The file
 .B lex.c
@@ -656,8 +656,8 @@ x.tab.h:Pcmp -s:	y.tab.h
 .SH SOURCE
 .B \*9/src/cmd/mk
 .SH SEE ALSO
-.IR sh (1),
-.IR regexp (7)
+.IM sh (1) ,
+.IM regexp (7)
 .PP
 A. Hume,
 ``Mk: a Successor to Make''