add throwIfNot
This commit is contained in:
parent
2ca5e185ce
commit
427ad23000
|
@ -194,6 +194,49 @@ let
|
|||
if builtins.elem (builtins.getEnv "NIX_ABORT_ON_WARN") ["1" "true" "yes"]
|
||||
then msg: builtins.trace "[1;31mwarning: ${msg}[0m" (builtins.abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors.")
|
||||
else msg: builtins.trace "[1;31mwarning: ${msg}[0m";
|
||||
|
||||
/**
|
||||
Like the `assert b; e` expression, but with a custom error message and
|
||||
without the semicolon.
|
||||
|
||||
If true, return the identity function, `r: r`.
|
||||
|
||||
If false, throw the error message.
|
||||
|
||||
Calls can be juxtaposed using function application, as `(r: r) a = a`, so
|
||||
`(r: r) (r: r) a = a`, and so forth.
|
||||
|
||||
|
||||
# Inputs
|
||||
|
||||
`cond`
|
||||
|
||||
: 1\. Function argument
|
||||
|
||||
`msg`
|
||||
|
||||
: 2\. Function argument
|
||||
|
||||
# Type
|
||||
|
||||
```
|
||||
bool -> string -> a -> a
|
||||
```
|
||||
|
||||
# Examples
|
||||
:::{.example}
|
||||
## `lib.trivial.throwIfNot` usage example
|
||||
|
||||
```nix
|
||||
throwIfNot (lib.isList overlays) "The overlays argument to nixpkgs must be a list."
|
||||
lib.foldr (x: throwIfNot (lib.isFunction x) "All overlays passed to nixpkgs must be functions.") (r: r) overlays
|
||||
pkgs
|
||||
```
|
||||
|
||||
:::
|
||||
*/
|
||||
throwIfNot = cond: msg: if cond then x: x else builtins.throw msg;
|
||||
|
||||
in
|
||||
{
|
||||
loadStatic = loadStatic;
|
||||
|
@ -203,4 +246,5 @@ in
|
|||
functionArgs = functionArgs;
|
||||
setFunctionArgs = setFunctionArgs;
|
||||
warn = warn;
|
||||
throwIfNot = throwIfNot;
|
||||
}
|
Loading…
Reference in a new issue