soelim: import from Plan9

Add entry in lib/moveplan9.files to trigger
relocation during INSTALL.

bin/soelim

@@ -0,0 +1,16 @@
+#!/usr/local/plan9/bin/rc
+# joyless reimplementation of soelim
+# the $0 recursion is a bit ugly
+
+# canonicalise troff commands first with sed into ". so file" form.
+# but the space after the dot has to come out; tbl can't cope with it.
+# friggin' html macros can be longer than two characters; grrr.
+sed '/^[.'']/{
+	s/([^\\])\\".*$/\1/
+#	s/^(.)[	 ]*([^	 \\][^	 \\])[	 ]*/\1 \2 /
+	s/^(.)[	 ]*([^	 \\][^	 \\])/\1 \2/
+}' $* | awk '	BEGIN { me = "'$0'" }
+		$1 !~ /^[.'']$/	{ print; next }
+		$2 == "so" { system(me " " $3) ; next }
+		$2 == "nx" { system(me " " $3) ; exit }
+		{ print }' | sed 's/^([.'']) /\1/'

lib/moveplan9.files

@@ -17,6 +17,7 @@ bin/netfilestat
 bin/quote1
 bin/quote2
 bin/sig
+bin/soelim
 bin/spell
 bin/src
 bin/ssam

man/man1/soelim.1

@@ -0,0 +1,30 @@
+.TH SOELIM 1
+.\" .so in the NAME line confuses the ptx machinery; sorry
+.SH NAME
+soelim \- preprocess so inclusion commands in troff input 
+.SH SYNOPSIS
+.B soelim
+[
+.I files ...
+]
+.SH DESCRIPTION
+.I Soelim
+reads the specified files or the standard input and performs
+the textual inclusion implied by
+.IR troff (1)
+directives of the form
+.sp
+.ti +2m
+.B "\&.so some_file
+.sp
+when they appear at the beginning of input lines.  This is useful when
+using programs such as
+.IR tbl (1)
+that do not normally do this, allowing
+placement of individual tables or other text objects in separate files
+to be run as a part of a large document.
+.SH SOURCE
+.B /rc/bin/soelim
+.SH "SEE ALSO"
+.IR deroff (1),
+.IR troff (1)