commit a541ce1fe7c7b6b8f699202283f7da5af0af6888 · pyrox.dev/nixpkgs

+20 -1
lib/trivial.nix
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         # TODO: figure out a clever way to integrate location information from

     

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         # something like __unsafeGetAttrPos.

     

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       -
         warn = msg: builtins.trace "[1;31mwarning: ${msg}[0m";

     

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         /*

     

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           Print a warning before returning the second argument. This function behaves

     

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           like `builtins.trace`, but requires a string message and formats it as a

     

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           warning, including the `warning: ` prefix.

     

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           To get a call stack trace and abort evaluation, set the environment variable

     

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           `NIX_ABORT_ON_WARN=true` and set the Nix options `--option pure-eval false --show-trace`

     

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           Type: string -> a -> a

     

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         */

     

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         warn =

     

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           if lib.elem (builtins.getEnv "NIX_ABORT_ON_WARN") ["1" "true" "yes"]

     

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           then msg: builtins.trace "[1;31mwarning: ${msg}[0m" (abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors.")

     

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           else msg: builtins.trace "[1;31mwarning: ${msg}[0m";

     

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         /*

     

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           Like warn, but only warn when the first argument is `true`.

     

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           Type: bool -> string -> a -> a

     

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         */

     

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         warnIf = cond: msg: if cond then warn msg else id;

     

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         info = msg: builtins.trace "INFO: ${msg}";