clarity.sample

(impl-trait .sip010-ft-trait.sip010-ft-trait)

;; SIP010 trait on mainnet
;; (impl-trait 'SP3FBR2AGK5H9QBDH3EEN6DF8EK8JY7RX8QJ5SVTE.sip-010-trait-ft-standard.sip-010-trait)

(define-constant contract-owner tx-sender)
(define-constant err-owner-only (err u100))
(define-constant err-not-token-owner (err u101))

;; No maximum supply!
(define-fungible-token clarity-coin)

(define-public (transfer (amount uint) (sender principal) (recipient principal) (memo (optional (buff 34))))
  (begin
    (asserts! (is-eq tx-sender sender) err-owner-only)
    (try! (ft-transfer? clarity-coin amount sender recipient))
    (match memo to-print (print to-print) 0x)
    (ok true)
  )
)

(define-read-only (get-name)
  (ok "Clarity Coin")
)

(define-read-only (get-symbol)
  (ok "CC")
)

(define-read-only (get-decimals)
  (ok u0)
)

(define-read-only (get-balance (who principal))
  (ok (ft-get-balance clarity-coin who))
)

(define-read-only (get-total-supply)
  (ok (ft-get-supply clarity-coin))
)

(define-read-only (get-token-uri)
  (ok none)
)

(define-public (mint (amount uint) (recipient principal))
  (begin
    (asserts! (is-eq tx-sender contract-owner) err-owner-only)
    (ft-mint? clarity-coin amount recipient)
  )
)

;; From https://github.com/clarity-lang/book/blob/main/projects/sip010-ft/contracts/clarity-coin.clar