1 files changed, 74 insertions, 15 deletions
diff --git a/doc/user/cpp b/doc/user/cpp
index 9b413ed..0e7748a 100644
--- a/doc/user/cpp
+++ b/doc/user/cpp
@@ -1,27 +1,86 @@
 @Chapter
-  @Title { C and C++ Programs }
+  @Title { Computer Programs }
   @Tag { cprint }
 @Begin
 @LP
-This chapter describes how to typeset C and C++ program text using the
-cp. @Index @Code "@CP"
-c. @Index { C++ }
-@Code "@CP" symbol in conjunction with the @Code c2lout filter.  The
-@Code "@CP" symbol looks after printing keywords in bold, variables
-in italic, and so on, depending on a style you choose.  It does not lay
-out programs in the sense of choosing indenting, it preserves the layout
-you give to the program.  From now on, `C' means `C or C++' wherever
-it occurs.
+This chapter describes how to typeset computer program text using Lout
+in conjunction with the @Code prg2lout
+prg2lout. @Index { @Code prg2lout filter program }
+@FootNote {
+Prior to Version 3.18 of Lout, this chapter described how to typeset
+programs written in the C programming language using the
+@Code c2lout filter, and Eiffel programs using the @Code eif2lout
+filter.  These have now been withdrawn and replaced by {@Code prg2lout},
+which handles multiple languages.  Ordinary Lout documents require no
+modifications as a result of this change.
+}
+filter program, which is always installed wherever Lout is.
 @PP
-It is possible to simply print out one or more C files; we call this
-@I { stand-alone mode }.  Alternatively, the C program text may be printed
-as part of a larger Lout document; we call this @I { embedded mode }.
+It is possible to simply print out one or more program files independently
+of any document.  Alternatively, the program text may be printed as part of
+a larger Lout document.  Either way, Lout does not lay out the programs in
+the sense of choosing line breaks and indenting; it uses whatever line
+breaks and indenting you give to the program.  What Lout does do is cope
+with characters in the program text that it would ordinarily either reject
+or interpret in some way (braces and so on), ensuring that you can include
+program texts with absolutely no modifications; plus, if you wish, Lout
+will print keywords in bold, identifiers in italics, etc.
+@PP
+At the time of writing, the available programming languages are:
+eiffel. @Index { Eiffel program printing }
+c. @Index { C and C++ program printing }
+blue. @Index { Blue program printing }
+@CD @Tbl
+    mv { 0.5vx }
+    af { Italic }
+    arb { yes }
+    aformat { @Cell A | @Cell B | @Cell C | @Cell D | @Cell E }
+    bformat { @Cell A | @Cell @Code B | @Cell @Code C | @Cell @Code D | @Cell E }
+{
+@Rowa
+    A { Language name }
+    B { Setup file name }
+    C { Lout symbol }
+    D { Default style }
+    E { ` ' escapes }
+@Rowb
+    A { C, C++ }
+    B { cprint }
+    C { "@CP" }
+    D { fixed }
+    E { No }
+@Rowb
+    A { Eiffel }
+    B { eiffel }
+    C { "@Eiffel" }
+    D { varying }
+    E { Yes }
+@Rowb
+    A { Blue }
+    B { blue }
+    C { "@Blue" }
+    D { varying }
+    E { Yes }
+}
+C and C++ are handled together since, for formatting purposes, they
+differ only in that C++ has some additional keywords plus an extra
+way to make comments.  Whenever we mention C from now on, we mean
+both C and C++.  The second to fifth columns of this table will be
+explained at various points later in this chapter.
+@PP
+The list of languages is likely to expand, because the @Code "prg2lout"
+program has been designed to make it easy to add new languages.  Consult
+the instructions at the top of the source file of that program if you
+want to try it yourself.
 @BeginSections
 @Include { cpp_lone }
 @Include { cpp_embe }
+@Include { cpp_opti }
 @Include { cpp_chan }
-@Include { cpp_comm }
 @Include { cpp_tabs }
-@Include { cpp_eiff }
+@Include { cpp_comm }
+@Include { cpp_prog }
+@Include { cpp_pipe }
+@Include { cpp_erro }
 @EndSections
 @End @Chapter