Rename racket-rackjure-indent to racket-indent-curly-as-sequence.

Also improve doc strings and comments.

Author: Greg Hendershott

example/example.rkt

@@ -1,4 +1,4 @@
-;; -*- racket-indent-sequence-depth: 100; racket-rackjure-indent: t; -*-
+;; -*- racket-indent-sequence-depth: 100; racket-indent-curly-as-sequence: t; -*-
 
 #lang racket
 

example/indent.rkt

@@ -1,4 +1,4 @@
-;; -*- racket-indent-sequence-depth: 100; racket-rackjure-indent: t; -*-
+;; -*- racket-indent-sequence-depth: 100; racket-indent-curly-as-sequence: t; -*-
 
 ;;; Quoted list
 
@@ -44,7 +44,7 @@
 #'(foo (#%app hasheq (quote a) (quote 42))
        (quote a))
 
-;;; Rackjure style dictionary
+;;; Rackjure style dictionary (when racket-indent-curly-as-sequence is t).
 
 {a b
  c d}

racket-custom.el

@@ -120,14 +120,23 @@ Defaults to a regexp ignoring all inputs of 0, 1, or 2 letters."
   :tag "Other"
   :group 'racket)
 
+(defcustom racket-indent-curly-as-sequence t
+  "Indent {} with items aligned with the head item?
+This is indirectly disabled if `racket-indent-sequence-depth' is 0.
+This is safe to set as a file-local variable."
+  :tag "Indent Curly As Sequence"
+  :type 'boolean
+  :safe #'booleanp
+  :group 'racket-other)
+
 (defcustom racket-indent-sequence-depth 0
   "To what depth should `racket--align-sequence-to-head' search.
 This affects the indentation of forms like '() `() #() -- and {}
-if `racket-rackjure-indent' is t -- but not #'() #`() ,() ,@(). A
-zero value disables, giving the normal indent behavior of
-DrRacket or Emacs `lisp-mode' derived modes like `scheme-mode'.
-Note that setting this to a high value can make indentation
-noticeably slower."
+if `racket-indent-curly-as-sequence' is t -- but not #'() #`()
+,() ,@(). A zero value disables, giving the normal indent
+behavior of DrRacket or Emacs `lisp-mode' derived modes like
+`scheme-mode'. Setting this to a high value can make indentation
+noticeably slower. This is safe to set as a file-local variable."
   :tag "Indent Sequence Depth"
   :type 'integerp
   :safe #'integerp
@@ -141,14 +150,6 @@ Instead you can insert actual λ characters using \\<racket-mode-map>\\[racket-i
   :safe #'booleanp
   :group 'racket-other)
 
-(defcustom racket-rackjure-indent t
-  "Indent {} with items aligned with the head item?
-This is indirectly disabled if `racket-indent-sequence-depth' is 0."
-  :tag "Rackjure Indent"
-  :type 'boolean
-  :safe #'booleanp
-  :group 'racket-other)
-
 (defcustom racket-smart-open-bracket-enable nil
   "Use `racket-smart-open-bracket' when '[' is pressed?"
   :tag "Smart Open Bracket Enable"

racket-indent.el

@@ -147,7 +147,7 @@ Lisp function does not specify a special indentation."
 (defun racket--align-sequence-with-head ()
   "Indent items with the head item for certain sequences?
 
-These include '() `() #() -- and {} if `racket-rackjure-indent'
+These include '() `() #() -- and {} if `racket-indent-curly-as-sequence'
 is t -- but not #'() #`() ,() ,@().
 
 To handle nested items, search `backward-up-list' up to
@@ -170,8 +170,8 @@ To handle nested items, search `backward-up-list' up to
                          ;; a vector literal: #( )
                          (and (eq (char-before (point)) ?#)
                               (eq (char-after  (point)) ?\())
-                         ;; #lang rackjure dict literal { ... }
-                         (and racket-rackjure-indent
+                         ;; { }
+                         (and racket-indent-curly-as-sequence
                               (eq (char-after (point)) ?{)))
                         (setq answer t))
                        (;; unquote or unquote-splicing