70 lines
1.9 KiB
Racket
70 lines
1.9 KiB
Racket
#lang racket
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(require net/url-string)
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(provide prefs-save prefs-load prefs-get prefs-update DEFAULT-PREFS)
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(define (instance-url? x)
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(and (string? x)
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(with-handlers ([exn? (lambda (e) #f)])
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(let ([u (string->url x)])
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(string=? "https" (url-scheme u))))))
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(define (id-string? x)
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(and (string? x) (regexp-match-exact? #px"^[a-zA-Z0-9_]+$" x)))
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(define (pronoun-list? x)
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(and (list? x) (= 5 (length x))))
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(define SCHEMA
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(hash 'instance-url instance-url?
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'display-name string?
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'name id-string?
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'make-discoverable boolean?
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'is-cat boolean?
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'pronouns pronoun-list?))
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(define DEFAULT-PREFS
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'((instance-url "https://myinstance.tld/")
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(display-name "Display Name(tm)")
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(name "username")
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(make-discoverable #t)
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(is-cat #t)
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(pronouns ("they" "them" "their" "theirs" "themselves"))))
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(define (prefs-save prefs [port (current-output-port)])
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(pretty-write prefs port))
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(define (validate-one k v)
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(unless (hash-has-key? SCHEMA k)
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(error "unknown preference name" k))
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(unless (apply (hash-ref SCHEMA k) (list v))
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(error "invalid preference value" v (hash-ref SCHEMA k))))
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(define (validate x)
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(unless (list? x)
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(error "preferences must be list"))
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(for ([kv (in-list x)])
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(match kv
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[(list k v) (validate-one k v)]
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[_ (error "invalid preference")]))
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x)
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(void (validate DEFAULT-PREFS))
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(define (prefs-load [port (current-input-port)])
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(validate (read port)))
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(define (prefs-get prefs what)
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(match prefs
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[(list _ ... (list (? (curry symbol=? what)) value) _ ...) value]
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[_ (error "no such pref" prefs what)]))
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(define (prefs-update prefs key value)
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(validate-one key value)
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(define (upd p)
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(match p
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['() (list (list key value))]
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[(list (list (? (curry symbol=? key)) _) rst ...) (cons (list key value) rst)]
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[x (cons (first x) (upd (rest x)))]))
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(upd prefs))
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