tmac/tmac.an: define .MR in a groff compatible way

groff 1.23.0 added .MR to its -man macro package.  The NEWS file states
that the inclusion of the macro "was prompted by its introduction to
Plan 9 from User Space's troff in August 2020."  From d32deab it seems
that the name for Plan 9 from User Space's implementation was suggested
by groff maintainer G. Brandon Robinson.

Not sure if the intention was to make these definitions compatible, but
it would be nice if they were.

Currently, Plan 9 from User Space's .MR expects its second argument to
be parenthesized.  groff's .MR does not.  This results in extra
parentheses appearing in manual references when viewing Plan 9 from User
Space's manual pages on a system using groff.

man/man4/0intro.4

@@ -15,7 +15,7 @@ In Plan 9, the kernel mount device
 \fImnt\fR(3)
 acts as a client to the 9P servers mounted in the current name space,
 translating system calls such as
-.MR open (2)
+.MR open 2
 into 9P transactions such as
 .IR open (9p).
 The kernel also multiplexes the potentially many processes onto a single 9P conversation
@@ -30,17 +30,17 @@ On Unix, 9P clients do not access servers via the traditional
 file system call interface.  Only the Unix name space can be accessed
 that way.
 Instead, 9P clients use the
-.MR 9pclient (3)
+.MR 9pclient 3
 library to connect and interact directly with particular 9P servers.
 The
-.MR 9p (1)
+.MR 9p 1
 command-line client is useful for interactive use and in shell scripts.
 .PP
 To preserve the façade of a single 9P conversation with each server,
 9P servers invoke
-.MR 9pserve (4) ,
+.MR 9pserve 4 ,
 typically via
-.MR post9pservice (3) .
+.MR post9pservice 3 .
 .I 9pserve
 announces a 9P service at a particular
 network address and multiplexes the clients that connect to
@@ -58,7 +58,7 @@ Setting the
 .B $NAMESPACE
 environment variable overrides this default.
 The
-.MR namespace (1)
+.MR namespace 1
 command prints the current name space directory.
 .PP
 Occasionally it is useful to be able to connect the input or output
@@ -73,7 +73,7 @@ implementation of
 (see also
 .I fsopenfd
 in
-.MR 9pclient (3) )
+.MR 9pclient 3 )
 returns the read or write end of a pipe;
 a helper process transfers data between the other end of the pipe
 and the 9P server.

man/man4/9import.4

@@ -19,7 +19,7 @@ tool allows an arbitrary
 on a remote
 .I system,
 with the capability of running the Plan 9
-.MR exportfs (4)
+.MR exportfs 4
 service,
 to be imported into the local name space.
 Usually
@@ -31,7 +31,7 @@ A process is started on the
 remote machine, with authority of the user of
 .IR 9import ,
 to perform work for the local machine using the
-.MR exportfs (4)
+.MR exportfs 4
 service.
 The default port used is TCP 17007.
 If
@@ -55,11 +55,11 @@ Use
 .I keypattern
 to select a key to authenticate to the remote side
 (see
-.MR auth (2) ).
+.MR auth 2 ).
 .TP
 .B -p
 Push the
-.MR aan (8)
+.MR aan 8
 filter onto the connection to protect against
 temporary network outages.
 .TP
@@ -69,11 +69,11 @@ Post the connection's mountable file descriptor as
 .SH SOURCE
 .B \*9/src/cmd/9import.c
 .SH SEE ALSO
-.MR srv (4) ,
-.MR aan (8) ,
-.MR listen1 (8) ,
+.MR srv 4 ,
+.MR aan 8 ,
+.MR listen1 8 ,
 .B cs
 in
-.MR ndb (7)
+.MR ndb 7
 .SH BUGS
 Encryption is not implemented.

man/man4/9pserve.4

@@ -50,7 +50,7 @@ and clunks any outstanding fids belonging to the client.
 .PP
 .I 9pserve
 is typically not invoked directly; use
-.MR post9pservice (3)
+.MR post9pservice 3
 instead.
 .PP
 The options are:
@@ -73,7 +73,7 @@ rewrite all attach messages to use
 and
 .IR afid ;
 used to implement
-.MR srv (4) 's
+.MR srv 4 's
 .B -a
 option
 .TP
@@ -90,8 +90,8 @@ instead assume 9P2000 and a maximum message size of
 .IR msize
 .PD
 .SH "SEE ALSO
-.MR intro (4) ,
+.MR intro 4 ,
 .IR intro (9p),
-.MR 9pfuse (4)
+.MR 9pfuse 4
 .SH SOURCE
 .B \*9/src/cmd/9pserve.c

man/man4/acme.4

@@ -15,7 +15,7 @@ acme \- control files for text windows
 \&... ]
 .SH DESCRIPTION
 The text window system
-.MR acme (1)
+.MR acme 1
 serves a variety of files for reading, writing, and controlling
 windows.
 Some of them are virtual versions of system files for dealing
@@ -28,7 +28,7 @@ When a command is run under
 a directory holding these files is posted as the 9P service
 .B acme
 (using
-.MR 9pserve (4) ).
+.MR 9pserve 4 ).
 .PP
 Some of these files supply virtual versions of services available from the underlying
 environment, in particular the character terminal files in Plan 9's
@@ -47,7 +47,7 @@ Other files are unique to
 is a subdirectory used by
 .B win
 (see
-.MR acme (1) )
+.MR acme 1 )
 as a mount point for the
 .I acme
 files associated with the window in which
@@ -441,5 +441,5 @@ except that reads stop at the end address.
 .SH SOURCE
 .B \*9/src/cmd/acme
 .SH SEE ALSO
-.MR rio (1) ,
-.MR acme (1)
+.MR rio 1 ,
+.MR acme 1

man/man4/factotum.4

@@ -127,7 +127,7 @@ RSA encryption and signatures, used by SSH and TLS.
 passwords in the clear.
 .TP
 .B vnc
-.MR vnc (1) 's
+.MR vnc 1 's
 challenge/response.
 .TP
 .B wep
@@ -186,7 +186,7 @@ cpu server.  On starting, it will attempt to get a
 key from NVRAM using
 .B readnvram
 (see
-.MR authsrv (3) ),
+.MR authsrv 3 ),
 prompting for anything it needs.
 It will never subsequently prompt for a
 key that it doesn't have.
@@ -245,7 +245,7 @@ specific to each supported protocol.
 .PP
 All keys can have additional attibutes that act either as comments
 or as selectors to distinguish them in the
-.MR auth (3)
+.MR auth 3
 library calls.
 .PP
 The factotum owner can use any key stored by factotum.
@@ -305,7 +305,7 @@ such as
 and
 .B auth_challenge
 (see
-.MR auth (3) )
+.MR auth 3 )
 to specify which key and protocol to use for an authentication.
 Like a key tuple, a key template is also a list of
 .IB attribute = value
@@ -367,7 +367,7 @@ turned on by the
 option.
 .PP
 By default when factotum starts it looks for a
-.MR secstore (1)
+.MR secstore 1
 account on $auth for the user and, if one exists,
 prompts for a secstore password in order to fetch
 the file
@@ -385,7 +385,7 @@ sets a public/private keypair for ssh authentication,
 generated by
 .B ssh_genkey
 (see
-.MR ssh (1) ).
+.MR ssh 1 ).
 .PD
 .SS "Confirming key use
 .PP
@@ -481,11 +481,11 @@ RPC's) until done
 if successful, reading back an
 .I AuthInfo
 structure (see
-.MR authsrv (3) ).
+.MR authsrv 3 ).
 .PP
 The RPC protocol is normally embodied by one of the
 routines in
-.MR auth (3) .
+.MR auth 3 .
 We describe it here should anyone want to extend
 the library.
 .PP
@@ -545,7 +545,7 @@ necessary
 authentication has succeeded, an
 .B AuthInfo
 structure (see
-.MR auth (3) )
+.MR auth 3 )
 can be retrieved with an
 .B authinfo
 RPC
@@ -703,7 +703,7 @@ and
 are intended to be proxied via
 .I auth_proxy
 (see
-.MR auth (3) ).
+.MR auth 3 ).
 .\" The protocols follow
 .\" .IR p9any (7)
 .\" and
@@ -736,7 +736,7 @@ before being sent over the network.
 .PP
 .I Vnc
 is the challenge-response protocol used by
-.MR vnc (1) ;
+.MR vnc 1 ;
 valid roles are
 .B client
 and
@@ -840,7 +840,7 @@ a string: a space-separated quoted user name and password
 that can be parsed with
 .I tokenize
 (see
-.MR getfields (3) ).
+.MR getfields 3 ).
 Conventionally, client keys have distinguishing attributes
 like
 .B service
@@ -905,7 +905,7 @@ and
 .BR !dk
 specifying the private half of the key;
 see
-.MR rsa (3) .
+.MR rsa 3 .
 Conventionally,
 .I rsa
 keys also have
@@ -972,7 +972,7 @@ attributes.
 If the key is to be used for signing, it must also have a
 .B !secret
 attribute; see
-.MR dsa (3) .
+.MR dsa 3 .
 Conventionally,
 .I dsa
 keys
@@ -1019,4 +1019,4 @@ The response is a hexadecimal string of length 32.
 .SH SOURCE
 .B \*9/src/cmd/auth/factotum
 .SH SEE ALSO
-.MR ssh-agent (1)
+.MR ssh-agent 1

man/man4/fontsrv.4

@@ -20,7 +20,7 @@ fontsrv \- file system access to host fonts
 presents the host window system's fonts
 in the standard Plan 9 format
 (see
-.MR font (7) ).
+.MR font 7 ).
 It serves a virtual directory tree mounted at
 .I mtpt
 (if the
@@ -72,14 +72,14 @@ representing 32-character Unicode ranges.
 .PP
 .I Openfont
 (see
-.MR graphics (3) )
+.MR graphics 3 )
 recognizes font paths beginning with
 .B /mnt/font
 and implements them by invoking
 .IR fontsrv ;
 it need not be running already.
 See
-.MR font (7)
+.MR font 7
 for a full discussion of font name syntaxes.
 .SH EXAMPLES
 List the fonts on the system:
@@ -96,7 +96,7 @@ or:
 .EE
 .LP
 Run
-.MR acme (1)
+.MR acme 1
 using the operating system's Monaco as the fixed-width font:
 .IP
 .EX
@@ -104,7 +104,7 @@ using the operating system's Monaco as the fixed-width font:
 .EE
 .LP
 Run
-.MR sam (1)
+.MR sam 1
 using the same font:
 .IP
 .EX
@@ -113,7 +113,7 @@ using the same font:
 .SH SOURCE
 .B \*9/src/cmd/fontsrv
 .SH SEE ALSO
-.MR font (7)
+.MR font 7
 .SH BUGS
 .PP
 Due to OS X restrictions,

man/man4/fossil.4

@@ -148,10 +148,10 @@ will be named
 The attach name used in
 .I mount
 (see
-.MR bind (1) ,
-.MR bind (2)
+.MR bind 1 ,
+.MR bind 2
 and
-.MR attach (5) )
+.MR attach 5 )
 selects a file system to be served
 and optionally a subtree,
 in the format
@@ -163,7 +163,7 @@ An empty attach name selects
 normally requires all users except
 .L none
 to provide authentication tickets on each
-.MR attach (5) .
+.MR attach 5 .
 To keep just anyone from connecting,
 .L none
 is only allowed to attach after another user
@@ -179,7 +179,7 @@ flag to
 or
 .B srv
 (see
-.MR fossilcons (8) ).
+.MR fossilcons 8 ).
 .PP
 The groups called
 .B noworld
@@ -207,7 +207,7 @@ readable by the world but writable only to the developers.
 starts a new instance of the fossil file server.
 It is configured mainly through console commands,
 documented in
-.MR fossilcons (8) .
+.MR fossilcons 8 .
 .PP
 The options are:
 .TF "-c\fI cmd
@@ -239,7 +239,7 @@ and
 which starts a file server console on
 .BI /srv/ cons \fR.
 See
-.MR fossilcons (8)
+.MR fossilcons 8
 for more information.
 .TP
 .BI -f " file
@@ -269,7 +269,7 @@ for inconsistencies.
 is deprecated in favor of the console
 .B check
 command (see
-.MR fossilcons (8) ).
+.MR fossilcons 8 ).
 .I Flchk
 prints
 .I fossil
@@ -375,7 +375,7 @@ system stored on Venti at
 The score should have been generated by
 .I fossil
 rather than by
-.MR vac (1) ,
+.MR vac 1 ,
 so that the appropriate snapshot metadata is present.
 .PD
 .PP
@@ -450,7 +450,7 @@ See the discussion of the
 and
 .B uname
 commands in
-.MR fossilcons (8)
+.MR fossilcons 8
 for more about the user table.
 .ne 3
 .PP
@@ -488,13 +488,13 @@ command to prepare the script.
 .SH SOURCE
 .B \*9/src/cmd/fossil
 .SH SEE ALSO
-.MR yesterday (1) ,
-.MR fs (3) ,
-.MR fs (4) ,
-.MR srv (4) ,
-.MR fossilcons (8) ,
-.MR loadfossil (8) ,
-.MR venti (8)
+.MR yesterday 1 ,
+.MR fs 3 ,
+.MR fs 4 ,
+.MR srv 4 ,
+.MR fossilcons 8 ,
+.MR loadfossil 8 ,
+.MR venti 8
 .SH BUGS
 It is possible that the disk format (but not the Venti format)
 will change in the future, to make the disk a full cache

man/man4/import.4

@@ -48,7 +48,7 @@ the path have different meanings on the two systems.)
 connects to
 .I system
 using
-.MR ssh (1) .
+.MR ssh 1 .
 It invokes
 .I import
 on the remote system to carry out the remote
@@ -109,5 +109,5 @@ sam &
 .SH SOURCE
 .B \*9/src/cmd/import.c
 .SH SEE ALSO
-.MR 9pserve (4) ,
-.MR intro (4)
+.MR 9pserve 4 ,
+.MR intro 4

man/man4/plumber.4

@@ -14,17 +14,17 @@ plumber \- file system for interprocess messaging
 The
 .I plumber
 is a user-level file server that receives, examines, rewrites, and dispatches
-.MR plumb (7)
+.MR plumb 7
 messages between programs.
 Its behavior is programmed by a
 .I plumbing
 file (default
 .BR $HOME/lib/plumbing )
 in the format of
-.MR plumb (7) .
+.MR plumb 7 .
 .PP
 Its services are posted via
-.MR 9pserve (4)
+.MR 9pserve 4
 as
 .BR plumb ,
 and consist of two
@@ -39,14 +39,14 @@ for dispatching messages to applications.
 Programs use
 .B fswrite
 (see
-.MR 9pclient (3) )
+.MR 9pclient 3 )
 to deliver messages to the
 .B send
 file, and
 .I fsread
 to receive them from the corresponding port.
 For example,
-.MR sam (1) 's
+.MR sam 1 's
 .B plumb
 menu item or the
 .B B
@@ -115,13 +115,13 @@ statements
 .TP
 .B plumb
 mount name for
-.MR plumber (4) .
+.MR plumber 4 .
 .SH SOURCE
 .B \*9/src/cmd/plumb
 .SH "SEE ALSO"
-.MR plumb (1) ,
-.MR plumb (3) ,
-.MR plumb (7)
+.MR plumb 1 ,
+.MR plumb 3 ,
+.MR plumb 7
 .\" .SH BUGS
 .\" .IR Plumber 's
 .\" file name space is fixed, so it is difficult to plumb

man/man4/ramfs.4

@@ -21,7 +21,7 @@ By default
 posts its service as
 .B ramfs
 using
-.MR 9pserve (4) .
+.MR 9pserve 4 .
 .PP
 The
 .B -S
@@ -46,5 +46,5 @@ It can also be used to provide high-performance temporary files.
 .SH SOURCE
 .B \*9/src/cmd/ramfs.c
 .SH "SEE ALSO"
-.MR 9p (3) ,
-.MR 9pserve (4)
+.MR 9p 3 ,
+.MR 9pserve 4

man/man4/smugfs.4

@@ -24,7 +24,7 @@ is a user-level file system that provides access to images
 stored on the SmugMug photo sharing service.
 It logs in after
 obtaining a password from 
-.MR factotum (4)
+.MR factotum 4
 using
 .B server=smugmug.com
 and
@@ -32,7 +32,7 @@ and
 (if any)
 as key criteria
 (see
-.MR auth (3) ).
+.MR auth 3 ).
 Then 
 .I smugfs
 serves a virtual directory tree mounted at
@@ -265,7 +265,7 @@ SmugMug,
 If multiple categories or albums have the same name,
 only one will be accessible via the file system interface.
 Renaming the accessible one via Unix's
-.MR mv (1)
+.MR mv 1
 will resolve the problem.
 .PP
 Boolean values appear as

man/man4/srv.4

@@ -22,7 +22,7 @@ srv, 9fs \- start network file service
 dials the given address and initializes the connection to serve the 9P protocol.
 It then posts the resulting connection in the current name space 
 (see
-.MR intro (4) )
+.MR intro 4 )
 as
 .I srvname 
 (default
@@ -70,7 +70,7 @@ available as service
 .IR sources .
 .I 9fs
 is an
-.MR rc (1)
+.MR rc 1
 script; examine it to see what local conventions apply.
 .SH EXAMPLES
 List the root directory on 
@@ -98,6 +98,6 @@ sudo mount -t 9p -o trans=unix,uname=$USER,dfltuid=`id -u`,dfltgid=`id -g`
 .br
 .B \*9/bin/9fs
 .SH "SEE ALSO
-.MR dial (3) ,
-.MR intro (4) ,
-.MR netfiles (1)
+.MR dial 3 ,
+.MR intro 4 ,
+.MR netfiles 1

man/man4/tapefs.4

@@ -91,7 +91,7 @@ Tenth Edition research Unix systems (4KB block size).
 .PP
 .I Zipfs
 interprets zip archives (see
-.MR gzip (1) ).
+.MR gzip 1 ).
 .SH SOURCE
 .PP
 These commands are constructed in a highly stereotyped
@@ -103,7 +103,7 @@ in
 .BR \*9/src/cmd/tapefs ,
 which in
 turn derive substantially from
-.MR ramfs (4) .
+.MR ramfs 4 .
 .SH "SEE ALSO
-.MR intro (7) ,
-.MR ramfs (4) .
+.MR intro 7 ,
+.MR ramfs 4 .

man/man4/vacfs.4

@@ -26,7 +26,7 @@ vacfs \- a Venti-based file system
 .SH DESCRIPTION
 .I Vacfs
 interprets the file system created by
-.MR vac (1)
+.MR vac 1
 so that it can be mounted into a Plan 9 file hierarchy.
 The data for the file system is stored on a Venti server
 with a root fingerprint specified in
@@ -81,6 +81,6 @@ The amount of memory, in bytes, allocated to the block cache. The default is 16M
 .SH SOURCE
 .B \*9/src/cmd/vac
 .SH "SEE ALSO"
-.MR vac (1) ,
+.MR vac 1 ,
 Plan 9's
 .IR venti (8)