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| author | William Carroll <wpcarro@gmail.com> | 2022-09-05T18·41-0700 |
|---|---|---|
| committer | clbot <clbot@tvl.fyi> | 2022-09-15T16·48+0000 |
| commit | 85b3f17007825b023d549d8e926322797e08ce6d (patch) | |
| tree | a979ba95000ac2495868a89d78baa4c1d81bb33e /tvix/eval/src/builtins/mod.rs | |
| parent | 05958703410d37f874c4705cabbbba2082c555f7 (diff) | |
feat(tvix/eval): Support builtins.head r/4862
TL;DR: - support `builtins.head` - define `ErrorKind::IndexOutOfBounds` and canonical error code - support basic unit tests Change-Id: I859107ffb4e220cba1be8c2ac41d1913dcca37ff Reviewed-on: https://cl.tvl.fyi/c/depot/+/6544 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
Diffstat (limited to 'tvix/eval/src/builtins/mod.rs')
| -rw-r--r-- | tvix/eval/src/builtins/mod.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs index 74215cd37c..3598ac71f7 100644 --- a/tvix/eval/src/builtins/mod.rs +++ b/tvix/eval/src/builtins/mod.rs @@ -75,6 +75,14 @@ fn pure_builtins() -> Vec<Builtin> { } Ok(Value::Integer(args[0].to_list()?.len() as i64)) }), + Builtin::new("head", 1, |args, vm| { + force!(vm, &args[0], xs, { + match xs.to_list()?.get(0) { + Some(x) => Ok(x.clone()), + None => Err(ErrorKind::IndexOutOfBounds { index: 0 }), + } + }) + }), Builtin::new("isAttrs", 1, |args, _| { Ok(Value::Bool(matches!(args[0], Value::Attrs(_)))) }), |