Nix builtins ============ Nix has a lot of built-in functions, some of which are accessible in the global scope, and some of which are only accessible through the global `builtins` attribute set. This document is an attempt to track all of these builtins, but without documenting their functionality. See also https://nixos.org/manual/nix/stable/expressions/builtins.html The `impl` column indicates implementation status in tvix: - implemented: "" (empty cell) - not yet implemented, but not blocked: `todo` - not yet implemented, but blocked by other prerequisites: - `store`: awaiting eval<->store api(s) - `context`: awaiting support for string contexts | name | global | arity | pure | impl | |-------------------------------|--------|-------|-------|---------| | abort | true | 1 | | | | add | false | 2 | true | | | addErrorContext | false | ? | | context | | all | false | 2 | true | | | any | false | 2 | true | | | appendContext | false | ? | | context | | attrNames | false | 1 | true | | | attrValues | false | | true | | | baseNameOf | true | | | | | bitAnd | false | | | | | bitOr | false | | | | | bitXor | false | | | | | builtins | true | | | | | catAttrs | false | | | | | compareVersions | false | | | | | concatLists | false | | | | | concatMap | false | | | | | concatStringsSep | false | | | | | currentSystem | false | | | | | currentTime | false | | false | | | deepSeq | false | | | | | derivation | true | | | store | | derivationStrict | true | | | store | | dirOf | true | | | | | div | false | | | | | elem | false | | | | | elemAt | false | | | | | false | true | | | | | fetchGit | true | | | store | | fetchMercurial | true | | | store | | fetchTarball | true | | | store | | fetchurl | false | | | store | | filter | false | | | | | filterSource | false | | | store | | findFile | false | | false | todo | | foldl' | false | | | | | fromJSON | false | | | | | fromTOML | true | | | | | functionArgs | false | | | | | genList | false | | | | | genericClosure | false | | | todo | | getAttr | false | | | | | getContext | false | | | context | | getEnv | false | | false | | | hasAttr | false | | | | | hasContext | false | | | context | | hashFile | false | | false | todo | | hashString | false | | | todo | | head | false | | | | | import | true | | | | | intersectAttrs | false | | | | | isAttrs | false | | | | | isBool | false | | | | | isFloat | false | | | | | isFunction | false | | | | | isInt | false | | | | | isList | false | | | | | isNull | true | | | | | isPath | false | | | | | isString | false | | | | | langVersion | false | | | | | length | false | | | | | lessThan | false | | | | | listToAttrs | false | | | | | map | true | | | | | mapAttrs | false | | | | | match | false | | | | | mul | false | | | | | nixPath | false | | | todo | | nixVersion | false | | | todo | | null | true | | | | | parseDrvName | false | | | | | partition | false | | | | | path | false | | sometimes | store | | pathExists | false | | false | | | placeholder | true | | | context | | readDir | false | | false | | | readFile | false | | false | | | removeAttrs | true | | | | | replaceStrings | false | | | | | scopedImport | true | | | | | seq | false | | | | | sort | false | | | | | split | false | | | todo | | splitVersion | false | | | | | storeDir | false | | | store | | storePath | false | | | store | | stringLength | false | | | | | sub | false | | | | | substring | false | | | | | tail | false | | | | | throw | true | | | | | toFile | false | | | store | | toJSON | false | | | todo | | toPath | false | | | | | toString | true | | | | | toXML | false | | | todo | | trace | false | | | | | true | true | | | | | tryEval | false | | | | | typeOf | false | | | | | unsafeDiscardOutputDependency | false | | | context | | unsafeDiscardStringContext | false | | | context | | unsafeGetAttrPos | false | | | todo | | valueSize | false | | | todo | ## Added after C++ Nix 2.3 (without Flakes enabled) | name | global | arity | pure | impl | |---------------|--------|-------|-------|-------| | break | false | 1 | | todo | | ceil | false | 1 | true | | | fetchTree | true | 1 | | todo | | floor | false | 1 | true | | | groupBy | false | 2 | true | | | traceVerbose | false | 2 | | todo | | zipAttrsWith | false | 2 | true | todo |