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28 lines
572 B
Clojure
28 lines
572 B
Clojure
(ns uxbox.util.lens
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(:refer-clojure :exclude [derive])
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(:require [cats.labs.lens :as l]))
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(defn dep-in
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[where link]
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{:pre [(vector? where) (vector? link)]}
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(l/lens
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(fn [s]
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(let [value (get-in s link)
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path (conj where value)]
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(get-in s path)))
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(fn [s f]
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(throw (ex-info "Not implemented" {})))))
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(defn getter
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[f]
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(l/lens f #(throw (ex-info "Not implemented" {}))))
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(defn derive
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[a path]
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(l/focus-atom (l/in path) a))
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(defn focus
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([state]
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(l/focus-atom l/id state))
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([lens state]
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(l/focus-atom lens state)))
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