move unstable/redex to unstable/gui/redex to fix dist-specs

Also, don't use unsupported unicode chars.
(Should these be added to latex renderer?)

collects/unstable/gui/redex.rkt

@@ -1,4 +1,4 @@
-#lang racket
+#lang racket/base
 (require racket/contract
          redex/reduction-semantics
          redex/pict
@@ -126,9 +126,11 @@
       (with-atomic-rewriter
        (cadr l)
        (let ([rw (car l)])
-         (if (string? rw)
-             (lambda () (text rw (default-style) (default-font-size)))
-             rw))
+         (cond [(string? rw)
+                (lambda () (text rw (default-style) (default-font-size)))]
+               [(pict? rw)
+                (lambda () rw)]
+               [else rw]))
        (with-atomic-rewriter* thunk (cddr l)))))
 (define (with-compound-rewriter* thunk l)
   (if (null? l)

collects/unstable/scribblings/gui.scrbl

@@ -12,5 +12,6 @@
 @include-section["gui/pict.scrbl"]
 @include-section["gui/slideshow.scrbl"]
 @include-section["gui/pslide.scrbl"]
+@include-section["gui/redex.scrbl"]
 @include-section["gui/snip.scrbl"]
 @include-section["gui/scribble.scrbl"]

collects/unstable/scribblings/gui/redex.scrbl

@@ -1,15 +1,15 @@
 #lang scribble/manual
-@(require racket/stxparam scribble/base scribble/eval "utils.rkt"
+@(require racket/stxparam scribble/base scribble/eval "../utils.rkt"
           (for-syntax racket/base syntax/srcloc)
-          (for-label racket/base racket/contract slideshow/pict redex unstable/redex))
+          (for-label racket/base racket/contract slideshow/pict redex unstable/gui/redex))
 
 @(define the-eval (make-base-eval))
-@(the-eval '(require redex/reduction-semantics redex/pict unstable/redex slideshow/pict))
+@(the-eval '(require redex/reduction-semantics redex/pict unstable/gui/redex slideshow/pict))
 
 @title[#:tag "redex"]{Redex}
 @unstable-header[]
 
-@defmodule[unstable/redex]
+@defmodule[unstable/gui/redex]
 
 This library provides functions to help typesetting for
 @racketmodname[redex] models. The following example program provides
@@ -50,7 +50,7 @@ notations.
 (add-atomic-rewriters!
  'empty "∅"
  'formula "φ"
- 'ZZ "\u2124"
+ 'ZZ (text "Z" '(bold . modern) (default-font-size)) ;; "\u2124" doesn't work with latex/pdf output
  'variable-not-otherwise-mentioned
      (lambda () (text "x, y, z, ..." (literal-style) (default-font-size)))
  'true (lambda () (text "true" '(caps . modern) (default-font-size)))
@@ -59,7 +59,7 @@ notations.
  'same? (binary-rw " = ")
  'in? (binary-rw " ∈ ")
  'Set (bracket-rw 'curly)
- 'Powerset (function-rw "𝒫 ")
+ 'Powerset (function-rw "P") ;; "𝒫 " doesn't work with latex/pdf output
  'Union (binary-rw "∪")
  'implies (binary-rw " ⇒ " #:parenthesize-left '(implies)))
 (with-rewriters

collects/unstable/scribblings/unstable.scrbl

@@ -99,7 +99,6 @@ Keep documentation and tests up to date.
 @include-section["parameter-group.scrbl"]
 @include-section["pretty.scrbl"]
 @include-section["recontract.scrbl"]
-@include-section["redex.scrbl"]
 @include-section["sandbox.scrbl"]
 @include-section["sequence.scrbl"]
 @include-section["string.scrbl"]