Merge pull request #95 from logical-mechanism/adding-minting-quantity-of

minting.quantity_of added;

.github/workflows/continuous-integration.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: aiken-lang/setup-aiken@v1
         with:
-          version: v1.1.0
+          version: v1.1.1
       - run: aiken fmt --check
       - run: aiken check -D
       - run: aiken build

CHANGELOG.md

@@ -1,5 +1,7 @@
 # v0.x.y
 
+- Added minting.quantity_of to get prove that some form of minting is occurring then the quantity is returned
+
 # v0.5.0
 
 - Updated toml to Aiken 1.1.0, stdlib main (v2.0.0 should be the tagged release)

aiken.toml

@@ -1,6 +1,6 @@
 name = "logical-mechanism/Assist"
 version = "v0.5.0"
-compiler = "v1.1.0"
+compiler = "v1.1.1"
 plutus = "v3"
 license = "Apache-2.0"
 description = "Aiken Assist Library"

lib/cardano/minting.ak

@@ -176,3 +176,47 @@ test tx_is_not_minting() {
   let flat = assets.from_asset(#"acab", cip68.prefix_222, 1) |> assets.flatten()
   is_occurring(flat, #"acab", cip68.prefix_333) == False
 }
+
+/// Prove that a transaction is minting something from a specific policy id 
+/// and token name. If it is minting then return the amount else return zero.
+///
+/// ```aiken
+/// minting.quantity_of(flatten_mint_value, pid, tkn)
+/// ```
+pub fn quantity_of(
+  flat: List<(PolicyId, AssetName, Int)>,
+  pid: PolicyId,
+  tkn: AssetName,
+) -> Int {
+  when flat is {
+    // loop the minted value
+    [(policy, token_name, quantity), ..rest] ->
+      if and {
+        policy == pid,
+        token_name == tkn,
+      } {
+        // we found what we are looking for so return the quantity
+        quantity
+      } else {
+        quantity_of(rest, pid, tkn)
+      }
+    // something wasn't found
+    [] -> 0
+  }
+}
+
+test tx_is_empty_minting_quantity() {
+  let flat =
+    []
+  quantity_of(flat, #"acab", cip68.prefix_222) == 0
+}
+
+test tx_is_minting_quantity() {
+  let flat = assets.from_asset(#"acab", cip68.prefix_222, 1) |> assets.flatten()
+  quantity_of(flat, #"acab", cip68.prefix_222) == 1
+}
+
+test tx_is_not_minting_quantity() {
+  let flat = assets.from_asset(#"acab", cip68.prefix_222, 1) |> assets.flatten()
+  quantity_of(flat, #"acab", cip68.prefix_333) == 0
+}