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eldritch horrors 512c1f05c3 Unify and refactor value printing 
Previously, there were two mostly-identical value printers -- one in
`libexpr/eval.cc` (which didn't force values) and one in
`libcmd/repl.cc` (which did force values and also printed ANSI color
codes).

This PR unifies both of these printers into `print.cc` and provides a
`PrintOptions` struct for controlling the output, which allows for
toggling whether values are forced, whether repeated values are tracked,
and whether ANSI color codes are displayed.

Additionally, `PrintOptions` allows tuning the maximum number of
attributes, list items, and bytes in a string that will be displayed;
this makes it ideal for contexts where printing too much output (e.g.
all of Nixpkgs) is distracting. (As requested by @roberth in
https://github.com/NixOS/nix/pull/9554#issuecomment-1845095735)

Please read the tests for example output.

Future work:
- It would be nice to provide this function as a builtin, perhaps
  `builtins.toStringDebug` -- a printing function that never fails would
  be useful when debugging Nix code.
- It would be nice to support customizing `PrintOptions` members on the
  command line, e.g. `--option to-string-max-attrs 1000`.

(cherry picked from commit 0fa08b4516, )

===

Restore ambiguous value printer for `nix-instantiate`

The Nix team has requested that this output format remain unchanged.
I've added a warning to the man page explaining that `nix-instantiate
--eval` output will not parse correctly in many situations.

(cherry picked from commit df84dd4d8d)

Change-Id: I7cca6b4b53cd0642f2d49af657d5676a8554c9f8
2024-03-09 03:50:06 +01:00
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ca Merge pull request #9589 from obsidiansystems/floating-content-addressing-derivations-eval-store 2024-03-04 07:15:08 +01:00
common Merge pull request #9632 from cole-h/nix-daemon-testing 2024-03-04 08:17:32 +01:00
config Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
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flakes Merge pull request #9324 from 9999years/fix-8854-take-2 2024-03-07 14:50:43 +01:00
lang Unify and refactor value printing 2024-03-09 03:50:06 +01:00
nested-sandboxing Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
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