Add mandoc-manpage for mv(1)

and mark it as finished in README.
Make it clear that -i has not been implemented yet and drop the
flag in the code instead of erroring out.

README

@@ -45,7 +45,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =* mkdir           yes                             none
 =* mkfifo          yes                             none
 =  mktemp          non-posix                       none
-=  mv              yes                             (-i)
+=* mv              yes                             (-i)
 =  nice            yes                             none
 =  nl              no                              -d, -f, -h, -l, -n, -p, -v, -w
 =  nohup           yes                             none

mv.1

@@ -1,22 +1,36 @@
-.TH MV 1 sbase\-VERSION
-.SH NAME
-mv \- move files and directories
-.SH SYNOPSIS
-.B mv
-.RB [ \-f ]
-.I file
-.RI [ name ]
-.P
-.B mv
-.RB [ \-f ]
-.RI [ file ...]
-.RI [ directory ]
-.SH DESCRIPTION
-.B mv
-moves or renames a given file or directory, naming it the given name.  If
-multiple files and directories are listed they will be moved into the given
-directory.
-.SH OPTIONS
-.TP
-.B \-f
-do not prompt for confirmation before overwriting the destination path.
+.Dd January 28, 2015
+.Dt MV 1 sbase\-VERSION
+.Sh NAME
+.Nm mv
+.Nd move files and directories
+.Sh SYNOPSIS
+.Nm mv
+.Op Fl f | Fl i
+.Ar source ...
+.Ar destination
+.Sh DESCRIPTION
+.Nm
+moves each
+.Ar source
+to
+.Ar destination .
+If only one
+.Ar source
+is given and
+.Ar destination
+is not a directory,
+.Nm
+overwrites the latter with the former.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl f | Fl i
+Do not prompt | Prompt before overwriting
+.Ar destination .
+Prompting has not been implemented yet.
+.El
+.Sh STANDARDS
+The
+.Nm
+utility is compliant with the
+.St -p1003.1-2008
+specification except from prompting.

mv.c

@@ -13,7 +13,7 @@ static int mv(const char *, const char *);
 static void
 usage(void)
 {
-	eprintf("usage: %s [-f] source... dest\n", argv0);
+	eprintf("usage: %s [-f | -i] source... dest\n", argv0);
 }
 
 int
@@ -22,6 +22,7 @@ main(int argc, char *argv[])
 	struct stat st;
 
 	ARGBEGIN {
+	case 'i':
 	case 'f':
 		break;
 	default: