mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-24 14:56:15 +02:00
d13c63afa2
Previously, errors while printing values in `nix repl` would be printed
in `«error: ...»` brackets rather than displayed normally:
```
nix-repl> legacyPackages.aarch64-darwin.pythonPackages.APScheduler
«error: Package ‘python-2.7.18.7’ in /nix/store/6s0m1qc31zw3l3kq0q4wd5cp3lqpkq0q-source/pkgs/development/interpreters/python/cpython/2.7/default.nix:335 is marked as insecure, refusing to evaluate.»
```
Now, errors will be displayed normally if they're emitted at the
top-level of an expression:
```
nix-repl> legacyPackages.aarch64-darwin.pythonPackages.APScheduler
error:
… in the condition of the assert statement
at /nix/store/6s0m1qc31zw3l3kq0q4wd5cp3lqpkq0q-source/lib/customisation.nix:268:17:
267| in commonAttrs // {
268| drvPath = assert condition; drv.drvPath;
| ^
269| outPath = assert condition; drv.outPath;
… in the left operand of the OR (||) operator
at /nix/store/6s0m1qc31zw3l3kq0q4wd5cp3lqpkq0q-source/pkgs/development/interpreters/python/passthrufun.nix:28:45:
27| if lib.isDerivation value then
28| lib.extendDerivation (valid value || throw "${name} should use `buildPythonPackage` or `toPythonModule` if it is to be part of the Python packages set.") {} value
| ^
29| else
(stack trace truncated; use '--show-trace' to show the full trace)
error: Package ‘python-2.7.18.7’ in /nix/store/6s0m1qc31zw3l3kq0q4wd5cp3lqpkq0q-source/pkgs/development/interpreters/python/cpython/2.7/default.nix:335 is marked as insecure, refusing to evaluate.
```
Errors emitted in nested structures (like e.g. when printing `nixpkgs`)
will still be printed in brackets.
120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
#pragma once
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/**
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* @file
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* @brief Options for printing Nix values.
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*/
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#include <limits>
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namespace nix {
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/**
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* How errors should be handled when printing values.
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*/
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enum class ErrorPrintBehavior {
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/**
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* Print the first line of the error in brackets: `«error: oh no!»`
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*/
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Print,
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/**
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* Throw the error to the code that attempted to print the value, instead
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* of suppressing it it.
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*/
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Throw,
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/**
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* Only throw the error if encountered at the top level of the expression.
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*
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* This will cause expressions like `builtins.throw "uh oh!"` to throw
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* errors, but will print attribute sets and other nested structures
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* containing values that error (like `nixpkgs`) normally.
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*/
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ThrowTopLevel,
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};
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/**
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* Options for printing Nix values.
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*/
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struct PrintOptions
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{
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/**
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* If true, output ANSI color sequences.
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*/
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bool ansiColors = false;
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/**
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* If true, force values.
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*/
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bool force = false;
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/**
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* If true and `force` is set, print derivations as
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* `«derivation /nix/store/...»` instead of as attribute sets.
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*/
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bool derivationPaths = false;
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/**
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* If true, track which values have been printed and skip them on
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* subsequent encounters. Useful for self-referential values.
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*/
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bool trackRepeated = true;
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/**
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* Maximum depth to evaluate to.
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*/
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size_t maxDepth = std::numeric_limits<size_t>::max();
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/**
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* Maximum number of attributes in attribute sets to print.
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*
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* Note that this is a limit for the entire print invocation, not for each
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* attribute set encountered.
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*/
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size_t maxAttrs = std::numeric_limits<size_t>::max();
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/**
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* Maximum number of list items to print.
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*
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* Note that this is a limit for the entire print invocation, not for each
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* list encountered.
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*/
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size_t maxListItems = std::numeric_limits<size_t>::max();
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/**
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* Maximum string length to print.
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*/
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size_t maxStringLength = std::numeric_limits<size_t>::max();
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/**
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* Indentation width for pretty-printing.
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*
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* If set to 0 (the default), values are not pretty-printed.
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*/
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size_t prettyIndent = 0;
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/**
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* How to handle errors encountered while printing values.
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*/
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ErrorPrintBehavior errors = ErrorPrintBehavior::Print;
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/**
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* True if pretty-printing is enabled.
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*/
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inline bool shouldPrettyPrint()
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{
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return prettyIndent > 0;
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}
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};
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/**
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* `PrintOptions` for unknown and therefore potentially large values in error messages,
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* to avoid printing "too much" output.
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*/
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static PrintOptions errorPrintOptions = PrintOptions {
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.ansiColors = true,
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.maxDepth = 10,
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.maxAttrs = 10,
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.maxListItems = 10,
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.maxStringLength = 1024,
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};
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}
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