nushell/crates/nu-cmd-lang
Antoine Stevan 626410b2aa
FEATURE: write better errors for error make and complete the doc (#8511)
# Description
this PR
- refactors `ErrorMake::run` to avoid duplicate branches depending on
the value of `--unspanned`
- completes the examples
1. show a really simple `error make` call, without any command
definition
  2. show a complete error format with all possible fields
3. the command definition but with indentation and slightly better
description
- adds results to the first two examples
- gives meaningful error messages for all known "bad" error formats,
using the span of the error format or the span of `$format.label` to
better explain why the format is bad

# User-Facing Changes
users have now the following help
```bash
Examples:
  Create a simple custom error
  > error make {msg: "my custom error message"}

  Create a more complex custom error
  > error make {
        msg: "my custom error message"
        label: {
            text: "my custom label text"  # not mandatory unless $.label exists
            start: 123  # not mandatory unless $.label.end is set
            end: 456  # not mandatory unless $.label.start is set
        }
    }

  Create a custom error for a custom command that shows the span of the argument
  > def foo [x] {
        let span = (metadata $x).span;
        error make {
            msg: "this is fishy"
            label: {
                text: "fish right here"
                start: $span.start
                end: $span.end
            }
        }
    }
```
and the following error messages when the error format is bad
https://asciinema.org/a/568107 🥳

# Tests + Formatting
- 🟢 `cargo fmt --all`
- 🟢 `cargo clippy --workspace -- -D warnings -D
clippy::unwrap_used -A clippy::needless_collect`
- 🔴 `cargo test --workspace`
=> the tests do not pass but they do not pass on latest `main` either =>
i should `cargo clean`, but that's an expensive operation on my
machine...

# After Submitting
the documentation would have to be regenerated over on the website
2023-03-22 08:06:47 -05:00
..
src FEATURE: write better errors for error make and complete the doc (#8511) 2023-03-22 08:06:47 -05:00
build.rs Cratification: Break out nu_cmd_lang into a separate crate (#8181) 2023-02-24 09:54:42 -06:00
Cargo.toml bump to 0.77.2 (#8496) 2023-03-17 21:29:15 +13:00
LICENSE Cratification: Break out nu_cmd_lang into a separate crate (#8181) 2023-02-24 09:54:42 -06:00