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eldritch horrors 08252967a8 libexpr: Support structured error classes 
While preparing PRs like #9753, I've had to change error messages in
dozens of code paths. It would be nice if instead of

    EvalError("expected 'boolean' but found '%1%'", showType(v))

we could write

    TypeError(v, "boolean")

or similar. Then, changing the error message could be a mechanical
refactor with the compiler pointing out places the constructor needs to
be changed, rather than the error-prone process of grepping through the
codebase. Structured errors would also help prevent the "same" error
from having multiple slightly different messages, and could be a first
step towards error codes / an error index.

This PR reworks the exception infrastructure in `libexpr` to
support exception types with different constructor signatures than
`BaseError`. Actually refactoring the exceptions to use structured data
will come in a future PR (this one is big enough already, as it has to
touch every exception in `libexpr`).

The core design is in `eval-error.hh`. Generally, errors like this:

    state.error("'%s' is not a string", getAttrPathStr())
      .debugThrow<TypeError>()

are transformed like this:

    state.error<TypeError>("'%s' is not a string", getAttrPathStr())
      .debugThrow()

The type annotation has moved from `ErrorBuilder::debugThrow` to
`EvalState::error`.

(cherry picked from commit c6a89c1a16)
Change-Id: Iced91ba4e00ca9e801518071fb43798936cbd05a
2024-03-09 04:47:05 -07:00
.github Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
config Run autoupdate 2021-06-01 11:42:38 +02:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc Merge pull request #9928 from 9999years/error-messages-in-nix-repl 2024-03-09 03:37:35 -07:00
m4 Merge pull request #6258 from obsidiansystems/gcc-bug-ergonomics 2024-03-04 05:24:33 +01:00
maintainers Merge pull request #9393 from hercules-ci/changelog-d 2024-03-04 07:11:19 +01:00
misc Merge pull request #9573 from hercules-ci/rl-next-md-frontmatter 2024-03-04 07:12:09 +01:00
mk Merge pull request #5145 from fedepell/local_doc_build_5140 2024-03-05 23:01:05 +01:00
perl Merge pull request #9152 from obsidiansystems/split-out-perl-nix 2024-03-04 04:37:44 +01:00
scripts Merge pull request #10001 from abathur/fix_macos_daemon_perms 2024-03-04 09:25:17 +01:00
src libexpr: Support structured error classes 2024-03-09 04:47:05 -07:00
tests libexpr: Support structured error classes 2024-03-09 04:47:05 -07:00
unit-test-data/libstore Merge pull request #9560 from obsidiansystems/serve-proto-unkeyed-valid-path-info-serializer 2024-03-07 12:37:33 +01:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Merge pull request #10085 from ShamrockLee/ignore-obsolete-testdir 2024-03-05 23:36:31 -07:00
.version Update version to 2.90.0 2024-03-07 19:57:39 -07:00
boehmgc-coroutine-sp-fallback.diff Merge pull request #8887 from obsidiansystems/bsd-cross-ci 2024-03-04 04:36:04 +01:00
boehmgc-traceable_allocator-public.diff Merge pull request #9430 from hercules-ci/remove-vlas 2024-03-04 07:11:25 +01:00
configure.ac Merge pull request #9844 from NixOS/pkg-config-gmock 2024-03-04 08:47:39 +01:00
CONTRIBUTING.md Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix add flake-compat to flake.nix and use sha256 in default.nix 2023-03-06 21:11:24 +01:00
docker.nix fix "add an option to include flake-registry..." 2023-05-16 14:35:31 +02:00
flake.lock flake.nix: upgrade to nixos-23.11 2024-03-08 23:59:01 +00:00
flake.nix Disable bear on all the things with darwin as hostPlatform 2024-03-09 00:03:50 -07:00
local.mk Merge pull request #9106 from Ericson2314/positive-source-filtering 2024-03-04 04:36:42 +01:00
Makefile Merge pull request #10074 from lf-/jade/ban-implicit-fallthrough 2024-03-07 00:11:12 -07:00
Makefile.config.in Merge pull request #9106 from Ericson2314/positive-source-filtering 2024-03-04 04:36:42 +01:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md Improve hacking.md 2023-02-13 12:00:00 +04:00
shell.nix Remove url literals 2022-01-24 13:28:21 +01:00

README.md

Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation

On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

Building And Developing

See our Hacking guide in our manual for instruction on how to to set up a development environment and build Nix from source.

Additional Resources

License

Nix is released under the LGPL v2.1.