catch up docs on --xelatex

Also, adjust help text for `--doc-binding` to make it
fit in 80 columns, and clean up related documentation text.

scribble-doc/scribblings/scribble/renderer.scrbl

@@ -415,7 +415,20 @@ support yet.
 @defmixin[render-mixin (render<%>) ()]{
 
 Specializes a @racket[render<%>] class for generating PDF output via
-Latex, building on @|latex:render-mixin| from @racketmodname[scribble/latex-render].}}
+Latex, building on @|latex:render-mixin| from @racketmodname[scribble/latex-render].}
+
+@defmixin[dvi-render-mixin (render<%>) ()]{
+
+Like @racket[render-mixin], but generates PDF output via @exec{latex},
+@exec{dvips}, and @exec{pstopdf}.
+
+@history[#:added "1.4"]}}
+
+@defmixin[xelatex-render-mixin (render<%>) ()]{
+
+Like @racket[render-mixin], but generates PDF output via @exec{xelatex}.
+
+@history[#:added "1.19"]}
 
 @; ----------------------------------------
 

scribble-doc/scribblings/scribble/running.scrbl

@@ -35,6 +35,9 @@ its file suffix:
  @item{@DFlag{pdf} --- PDF @filepath{@|fn|.pdf} that is generated
        via @exec{pdflatex}}
 
+ @item{@DFlag{xelatex} --- PDF @filepath{@|fn|.pdf} that is generated
+       via @exec{xelatex}}
+
  @item{@DFlag{dvipdf} --- PDF @filepath{@|fn|.pdf} that is generated
        via @exec{latex}, @exec{dvips}, and @exec{pstopdf}}
 
@@ -65,16 +68,17 @@ source declares a module. The module should either have a @racket[doc]
 that exports @racket[doc] as a @racket[part], or it should directly
 export @racket[doc] as a @racket[part]. (The submodule is tried first,
 and the main module is not directly loaded or evaluated if the
-submodule can be loaded on its own.) (Use @DFlag{doc-binding} to
-change @racket[doc] to another symbol.)
+submodule can be loaded on its own.) Use @DFlag{doc-binding} to
+access an alternate exported name in place of @racket[doc].
 
 When multiple documents are rendered at the same time, cross-reference
 information in one document is visible to the other documents. See
 @secref["xref-flags"] for information on references that cross
 documents that are built separately.
 
-@history[#:changed "1.18" @elem{Added @DFlag{doc-binding}.}]
-@history[#:changed "1.4" @elem{Added @DFlag{dvipdf}.}]
+@history[#:changed "1.4" @elem{Added @DFlag{dvipdf}.}
+         #:changed "1.18" @elem{Added @DFlag{doc-binding}.}
+         #:changed "1.19" @elem{Added @DFlag{xelatex}.}]
 
 @section{Extra and Format-Specific Files}
 

scribble-lib/info.rkt

@@ -23,4 +23,4 @@
 
 (define pkg-authors '(mflatt eli))
 
-(define version "1.18")
+(define version "1.19")

scribble-lib/scribble/run.rkt

@@ -140,9 +140,9 @@
    #:once-each
    [("--quiet") "suppress output-file and undefined-tag reporting"
     (current-quiet #t)]
-   [("--doc-binding") new-doc-binding
-    "look for document in new-doc-binding rather than 'doc"
-    (set! doc-binding (string->symbol new-doc-binding))]
+   [("--doc-binding") id
+    "render document provided as <id> instead of `doc`"
+    (set! doc-binding (string->symbol id))]
    #:args (file . another-file)
    (let ([files (cons file another-file)])
      (parameterize ([current-command-line-arguments