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make std.result compatible with builtins.tryEval

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This commit is contained in:
Emile Clark-Boman 2025-12-14 11:33:40 +10:00
parent 8f347b9ad3
commit a547a9bcaf
1 changed files with 8 additions and 11 deletions
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19
nib/std/result.nix
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@ -1,29 +1,26 @@
{lists, ...}: rec {
# Result Monad
Ok = value: {
ok = true;
success = true;
value = value;
};
Err = err: {
ok = false;
error = err;
success = false;
value = err;
};
# Pattern Matching
isResult = r:
(builtins.length (builtins.attrNames r) == 2)
&& builtins.hasAttr "ok" r
&& (builtins.hasAttr "value" r || builtins.hasAttr "error" r);
isOk = r: isResult r && r.ok;
isErr = r: isResult r && !r.ok;
isResult = r: builtins.attrNames r == ["success" "value"];
isOk = r: isResult r && r.success;
isErr = r: isResult r && !r.success;
# Unwrap (Monadic Return Operation)
unwrap = f: r:
if isOk r
then r.value
else f r.error;
else f r.value;
unwrapDefault = default: unwrap (x: default);
unwrapDefault = default: unwrap (_: default);
# Map (Monadic Bind Operation)
identity = r: r;