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add preferences:default-set?

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This commit is contained in:
Robby Findler 2013-11-09 00:18:05 -06:00
parent 4d0b1fe4dd
commit 3cfe5c0c57
1 changed files with 17 additions and 9 deletions
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26
pkgs/gui-pkgs/gui-lib/framework/preferences.rkt
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@ -56,7 +56,7 @@ the state transitions / contracts are:
;; these four functions determine the state of a preference
(define (pref-un/marshall-set? pref) (hash-has-key? marshall-unmarshall pref))
(define (pref-default-set? pref) (hash-has-key? defaults pref))
(define (preferences:default-set? pref) (hash-has-key? defaults pref))
(define (pref-can-init? pref)
(and (not snapshot-grabbed?)
(not (hash-has-key? preferences pref))))
@ -88,7 +88,7 @@ the state transitions / contracts are:
v]
;; first time reading this, check the file & unmarshall value, if
;; it's not there, use the default
[(pref-default-set? p)
[(preferences:default-set? p)
(let* (;; try to read the preference from the preferences file
[v (read-pref-from-file p)]
[v (if (eq? v none)
@ -99,7 +99,7 @@ the state transitions / contracts are:
;; set the value for future reference and return it
(hash-set! preferences p v)
v)]
[(not (pref-default-set? p))
[(not (preferences:default-set? p))
(raise-unknown-preference-error
'preferences:get
"tried to get a preference but no default set for ~e"
@ -137,7 +137,7 @@ the state transitions / contracts are:
(for-each
(λ (p value)
(cond
[(pref-default-set? p)
[(preferences:default-set? p)
(define default (hash-ref defaults p))
(define checker? (default-checker default))
(unless (checker? value)
@ -150,7 +150,7 @@ the state transitions / contracts are:
p value checker?))
(check-callbacks p value)
(hash-set! preferences p value)]
[(not (pref-default-set? p))
[(not (preferences:default-set? p))
(raise-unknown-preference-error
'preferences:set
(string-append
@ -249,11 +249,11 @@ the state transitions / contracts are:
(define (preferences:set-un/marshall p marshall unmarshall)
(cond
[(and (pref-default-set? p)
[(and (preferences:default-set? p)
(not (pref-un/marshall-set? p))
(pref-can-init? p))
(hash-set! marshall-unmarshall p (make-un/marshall marshall unmarshall))]
[(not (pref-default-set? p))
[(not (preferences:default-set? p))
(error 'preferences:set-un/marshall
"must call set-default for ~s before calling set-un/marshall for ~s"
p p)]
@ -274,7 +274,7 @@ the state transitions / contracts are:
#:aliases [aliases '()]
#:rewrite-aliases [rewrite-aliases (map (lambda (x) values) aliases)])
(cond
[(and (not (pref-default-set? p))
[(and (not (preferences:default-set? p))
(pref-can-init? p))
(define default-okay? (checker default-value))
(unless default-okay?
@ -295,7 +295,7 @@ the state transitions / contracts are:
(error 'preferences:set-default
"tried to call set-default for preference ~e but it cannot be configured any more"
p)]
[(pref-default-set? p)
[(preferences:default-set? p)
(error 'preferences:set-default
"preferences default already set for ~e" p)]
[(not (pref-can-init? p))
@ -434,6 +434,14 @@ the state transitions / contracts are:
of the preferences. It defaults to @racket['()]. If @racket[rewrite-aliases]
is present, it is used to adjust the old values of the preferences
when they are present in the saved file.})
(proc-doc/names
preferences:default-set?
(-> symbol? boolean?)
(pref)
@{Returns @racket[#t] if @racket[pref] has been passed to
@racket[preferences:set-default], @racket[#f]
otherwise})
(proc-doc/names
preferences:set-un/marshall