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| Author | SHA1 | Message | Date | |
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132ikl
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36c1073441
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Rework sorting and add cell path and closure comparators to sort-by (#13154)
# Description Closes #12535 Implements sort-by functionality of #8322 Fixes sort-by part of #8667 This PR does two main things: add a new cell path and closure parameter to `sort-by`, and attempt to make Nushell's sorting behavior well-defined. ## `sort-by` features The `columns` parameter is replaced with a `comparator` parameter, which can be a cell path or a closure. Examples are from docs PR. 1. Cell paths The basic interactive usage of `sort-by` is the same. For example, `ls | sort-by modified` still works the same as before. It is not quite a drop-in replacement, see [behavior changes](#behavior-changes). Here's an example of how the cell path comparator might be useful: ```nu > let cities = [ {name: 'New York', info: { established: 1624, population: 18_819_000 } } {name: 'Kyoto', info: { established: 794, population: 37_468_000 } } {name: 'São Paulo', info: { established: 1554, population: 21_650_000 } } ] > $cities | sort-by info.established ╭───┬───────────┬────────────────────────────╮ │ # │ name │ info │ ├───┼───────────┼────────────────────────────┤ │ 0 │ Kyoto │ ╭─────────────┬──────────╮ │ │ │ │ │ established │ 794 │ │ │ │ │ │ population │ 37468000 │ │ │ │ │ ╰─────────────┴──────────╯ │ │ 1 │ São Paulo │ ╭─────────────┬──────────╮ │ │ │ │ │ established │ 1554 │ │ │ │ │ │ population │ 21650000 │ │ │ │ │ ╰─────────────┴──────────╯ │ │ 2 │ New York │ ╭─────────────┬──────────╮ │ │ │ │ │ established │ 1624 │ │ │ │ │ │ population │ 18819000 │ │ │ │ │ ╰─────────────┴──────────╯ │ ╰───┴───────────┴────────────────────────────╯ ``` 2. Key closures You can supply a closure which will transform each value into a sorting key (without changing the underlying data). Here's an example of a key closure, where we want to sort a list of assignments by their average grade: ```nu > let assignments = [ {name: 'Homework 1', grades: [97 89 86 92 89] } {name: 'Homework 2', grades: [91 100 60 82 91] } {name: 'Exam 1', grades: [78 88 78 53 90] } {name: 'Project', grades: [92 81 82 84 83] } ] > $assignments | sort-by { get grades | math avg } ╭───┬────────────┬───────────────────────╮ │ # │ name │ grades │ ├───┼────────────┼───────────────────────┤ │ 0 │ Exam 1 │ [78, 88, 78, 53, 90] │ │ 1 │ Project │ [92, 81, 82, 84, 83] │ │ 2 │ Homework 2 │ [91, 100, 60, 82, 91] │ │ 3 │ Homework 1 │ [97, 89, 86, 92, 89] │ ╰───┴────────────┴───────────────────────╯ ``` 3. Custom sort closure The `--custom`, or `-c`, flag will tell `sort-by` to interpret closures as custom sort closures. A custom sort closure has two parameters, and returns a boolean. The closure should return `true` if the first parameter comes _before_ the second parameter in the sort order. For a simple example, we could rewrite a cell path sort as a custom sort (see [here](https://github.com/nushell/nushell.github.io/pull/1568/files#diff-a7a233e66a361d8665caf3887eb71d4288000001f401670c72b95cc23a948e86R231) for a more complex example): ```nu > ls | sort-by -c {|a, b| $a.size < $b.size } ╭───┬─────────────────────┬──────┬──────────┬────────────────╮ │ # │ name │ type │ size │ modified │ ├───┼─────────────────────┼──────┼──────────┼────────────────┤ │ 0 │ my-secret-plans.txt │ file │ 100 B │ 10 minutes ago │ │ 1 │ shopping_list.txt │ file │ 100 B │ 2 months ago │ │ 2 │ myscript.nu │ file │ 1.1 KiB │ 2 weeks ago │ │ 3 │ bigfile.img │ file │ 10.0 MiB │ 3 weeks ago │ ╰───┴─────────────────────┴──────┴──────────┴────────────────╯ ``` ## Making sort more consistent I think it's important for something as essential as `sort` to have well-defined semantics. This PR contains some changes to try to make the behavior of `sort` and `sort-by` consistent. In addition, after working with the internals of sorting code, I have a much deeper understanding of all of the edge cases. Here is my attempt to try to better define some of the semantics of sorting (if you are just interested in changes, skip to "User-Facing changes") - `sort`, `sort -v`, and `sort-by` now all work the same. Each individual sort implementation has been refactored into two functions in `sort_utils.rs`: `sort`, and `sort_by`. These can also be used in other parts of Nushell where values need to be sorted. - `sort` and `sort-by` used to handle `-i` and `-n` differently. - `sort -n` would consider all values which can't be coerced into a string to be equal - `sort-by -i` and `sort-by -n` would only work if all values were strings - In this PR, insensitive sort only affects comparison between strings, and natural sort only applies to numbers and strings (see below). - (not a change) Before and after this PR, `sort` and `sort-by` support sorting mixed types. There was a lot of discussion about potentially making `sort` and `sort-by` only work on lists of homogeneous types, but the general consensus was that `sort` should not error just because its input contains incompatible types. - In order to try to make working with data containing `null` values easier, I changed the PartialOrd order to sort `Nothing` values to the end of a list, regardless of what other types the list contains. Before, `null` would be sorted before `Binary`, `CellPath`, and `Custom` values. - (not a change) When sorted, lists of mixed types will contain sorted values of each type in order, for the most part - (not a change) For example, `[0x[1] (date now) "a" ("yesterday" | into datetime) "b" 0x[0]]` will be sorted as `["a", "b", a day ago, now, [0], [1]]`, where sorted strings appear first, then sorted datetimes, etc. - (not a change) The exception to this is `Int`s and `Float`s, which will intermix, `Strings` and `Glob`s, which will intermix, and `None` as described above. Additionally, natural sort will intermix strings with ints and floats (see below). - Natural sort no longer coerce all inputs to strings. - I did originally make natural only apply to strings, but @fdncred pointed out that the previous behavior also allowed you to sort numeric strings with numbers. This seems like a useful feature if we are trying to support sorting with mixed types, so I settled on coercing only numbers (int, float). This can be reverted if people don't like it. - Here is an example of this behavior in action, which is the same before and after this PR: ```nushell $ [1 "4" 3 "2"] | sort --natural ╭───┬───╮ │ 0 │ 1 │ │ 1 │ 2 │ │ 2 │ 3 │ │ 3 │ 4 │ ╰───┴───╯ ``` # User-Facing Changes ## New features - Replaces the `columns` string parameter of `sort-by` with a cell path or a closure. - The cell path parameter works exactly as you would expect - By default, the `closure` parameter acts as a "key sort"; that is, each element is transformed by the closure into a sorting key - With the `--custom` (`-c`) parameter, you can define a comparison function for completely custom sorting order. ## Behavior changes <details> <summary><code>sort -v</code> does not coerce record values to strings</summary> This was a bit of a surprising behavior, and is now unified with the behavior of `sort` and `sort-by`. Here's an example where you can observe the values being implicitly coerced into strings for sorting, as they are sorted like strings rather than numbers: Old behavior: ```nushell $ {foo: 9 bar: 10} | sort -v ╭─────┬────╮ │ bar │ 10 │ │ foo │ 9 │ ╰─────┴────╯ ``` New behavior: ```nushell $ {foo: 9 bar: 10} | sort -v ╭─────┬────╮ │ foo │ 9 │ │ bar │ 10 │ ╰─────┴────╯ ``` </details> <details> <summary>Changed <code>sort-by</code> parameters from <code>string</code> to <code>cell-path</code> or <code>closure</code>. Typical interactive usage is the same as before, but if passing a variable to <code>sort-by</code> it must be a cell path (or closure), not a string</summary> Old behavior: ```nushell $ let sort = "modified" $ ls | sort-by $sort ╭───┬──────┬──────┬──────┬────────────────╮ │ # │ name │ type │ size │ modified │ ├───┼──────┼──────┼──────┼────────────────┤ │ 0 │ foo │ file │ 0 B │ 10 hours ago │ │ 1 │ bar │ file │ 0 B │ 35 seconds ago │ ╰───┴──────┴──────┴──────┴────────────────╯ ``` New behavior: ```nushell $ let sort = "modified" $ ls | sort-by $sort Error: nu:🐚:type_mismatch × Type mismatch. ╭─[entry #10:1:14] 1 │ ls | sort-by $sort · ──┬── · ╰── Cannot sort using a value which is not a cell path or closure ╰──── $ let sort = $."modified" $ ls | sort-by $sort ╭───┬──────┬──────┬──────┬───────────────╮ │ # │ name │ type │ size │ modified │ ├───┼──────┼──────┼──────┼───────────────┤ │ 0 │ foo │ file │ 0 B │ 10 hours ago │ │ 1 │ bar │ file │ 0 B │ 2 minutes ago │ ╰───┴──────┴──────┴──────┴───────────────╯ ``` </details> <details> <summary>Insensitve and natural sorting behavior reworked</summary> Previously, the `-i` and `-n` worked differently for `sort` and `sort-by` (see "Making sort more consistent"). Here are examples of how these options result in different sorts now: 1. `sort -n` - Old behavior (types other than numbers, strings, dates, and binary sorted incorrectly) ```nushell $ [2sec 1sec] | sort -n ╭───┬──────╮ │ 0 │ 2sec │ │ 1 │ 1sec │ ╰───┴──────╯ ``` - New behavior ```nushell $ [2sec 1sec] | sort -n ╭───┬──────╮ │ 0 │ 1sec │ │ 1 │ 2sec │ ╰───┴──────╯ ``` 2. `sort-by -i` - Old behavior (uppercase words appear before lowercase words as they would in a typical sort, indicating this is not actually an insensitive sort) ```nushell $ ["BAR" "bar" "foo" 2 "FOO" 1] | wrap a | sort-by -i a ╭───┬─────╮ │ # │ a │ ├───┼─────┤ │ 0 │ 1 │ │ 1 │ 2 │ │ 2 │ BAR │ │ 3 │ FOO │ │ 4 │ bar │ │ 5 │ foo │ ╰───┴─────╯ ``` - New behavior (strings are sorted stably, indicating this is an insensitive sort) ```nushell $ ["BAR" "bar" "foo" 2 "FOO" 1] | wrap a | sort-by -i a ╭───┬─────╮ │ # │ a │ ├───┼─────┤ │ 0 │ 1 │ │ 1 │ 2 │ │ 2 │ BAR │ │ 3 │ bar │ │ 4 │ foo │ │ 5 │ FOO │ ╰───┴─────╯ ``` 3. `sort-by -n` - Old behavior (natural sort does not work when data contains non-string values) ```nushell $ ["10" 8 "9"] | wrap a | sort-by -n a ╭───┬────╮ │ # │ a │ ├───┼────┤ │ 0 │ 8 │ │ 1 │ 10 │ │ 2 │ 9 │ ╰───┴────╯ ``` - New behavior ```nushell $ ["10" 8 "9"] | wrap a | sort-by -n a ╭───┬────╮ │ # │ a │ ├───┼────┤ │ 0 │ 8 │ │ 1 │ 9 │ │ 2 │ 10 │ ╰───┴────╯ ``` </details> <details> <summary> Sorting a list of non-record values with a non-existent column/path now errors instead of sorting the values directly (<code>sort</code> should be used for this, not <code>sort-by</code>) </summary> Old behavior: ```nushell $ [2 1] | sort-by foo ╭───┬───╮ │ 0 │ 1 │ │ 1 │ 2 │ ╰───┴───╯ ``` New behavior: ```nushell $ [2 1] | sort-by foo Error: nu:🐚:incompatible_path_access × Data cannot be accessed with a cell path ╭─[entry #29:1:17] 1 │ [2 1] | sort-by foo · ─┬─ · ╰── int doesn't support cell paths ╰──── ``` </details> <details> <summary><code>sort</code> and <code>sort-by</code> output <code>List</code> instead of <code>ListStream</code> </summary> This isn't a meaningful change (unless I misunderstand the purpose of ListStream), since `sort` and `sort-by` both need to collect in order to do the sorting anyway, but is user observable. Old behavior: ```nushell $ ls | sort | describe -d ╭──────────┬───────────────────╮ │ type │ stream │ │ origin │ nushell │ │ subtype │ {record 3 fields} │ │ metadata │ {record 1 field} │ ╰──────────┴───────────────────╯ ``` ```nushell $ ls | sort-by name | describe -d ╭──────────┬───────────────────╮ │ type │ stream │ │ origin │ nushell │ │ subtype │ {record 3 fields} │ │ metadata │ {record 1 field} │ ╰──────────┴───────────────────╯ ``` New behavior: ```nushell ls | sort | describe -d ╭────────┬─────────────────╮ │ type │ list │ │ length │ 22 │ │ values │ [table 22 rows] │ ╰────────┴─────────────────╯ ``` ```nushell $ ls | sort-by name | describe -d ╭────────┬─────────────────╮ │ type │ list │ │ length │ 22 │ │ values │ [table 22 rows] │ ╰────────┴─────────────────╯ ``` </details> - `sort` now errors when nothing is piped in (`sort-by` already did this) # Tests + Formatting I added lots of unit tests on the new sort implementation to enforce new sort behaviors and prevent regressions. # After Submitting See [docs PR](https://github.com/nushell/nushell.github.io/pull/1568), which is ~2/3 finished. --------- Co-authored-by: NotTheDr01ds <32344964+NotTheDr01ds@users.noreply.github.com> Co-authored-by: Ian Manske <ian.manske@pm.me> |
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Vikrant A P
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75180d07de
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Fix: remove unnecessary r#"..."# (#8670) (#9764)
<!-- if this PR closes one or more issues, you can automatically link the PR with them by using one of the [*linking keywords*](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword), e.g. - this PR should close #xxxx - fixes #xxxx you can also mention related issues, PRs or discussions! --> # Description <!-- Thank you for improving Nushell. Please, check our [contributing guide](../CONTRIBUTING.md) and talk to the core team before making major changes. Description of your pull request goes here. **Provide examples and/or screenshots** if your changes affect the user experience. --> This PR is related to **Tests: clean up unnecessary use of cwd, pipeline(), etc. [#8670](https://github.com/nushell/nushell/issues/8670)** - Removed the `r#"..."#` raw string literal syntax, which is unnecessary when there are no special characters that need quoting from the tests that use the `nu!` macro. - `cwd:` and `pipeline()` has not changed # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> # Tests + Formatting <!-- Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect -A clippy::result_large_err` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass - `cargo run -- -c "use std testing; testing run-tests --path crates/nu-std"` to run the tests for the standard library > **Note** > from `nushell` you can also use the `toolkit` as follows > ```bash > use toolkit.nu # or use an `env_change` hook to activate it automatically > toolkit check pr > ``` --> # After Submitting <!-- If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. --> |
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Reilly Wood
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3076378373
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Slim down tests (#9021)
This PR just tidies up some tests by removing unused code: 1. If the filesystem is not touched, don't use the filesystem playground/sandbox 2. If the filesystem is not touched, don't specify the `cwd` 3. If the command is short, don't bother wrapping it in `pipeline()` 4. If the command doesn't have quotes, don't bother with a `r#"..."#` raw string Part of #8670. |
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Benjamin Lee
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53beba7acc
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Support passing an empty list to sort, uniq, sort-by, and uniq-by (issue #5957) (#8669)
# Description Currently, all four of these commands return a (rather-confusing) spanless error when passed an empty list: ``` > [] | sort Error: × no values to work with help: no values to work with ``` This PR changes these commands to always output `[]` if the input is `[]`. ``` > [] | sort ╭────────────╮ │ empty list │ ╰────────────╯ > [] | uniq-by foo ╭────────────╮ │ empty list │ ╰────────────╯ ``` I'm not sure what the original logic was here, but in the case of `sort` and `uniq`, I think the current behavior is straightforwardly wrong. `sort-by` and `uniq-by` are a bit more complicated, since they currently try to perform some validation that the specified column name is present in the input (see #8667 for problems with this validation, where a possible outcome is removing the validation entirely). When passed `[]`, it's not possible to do any validation because there are no records. This opens up the possibility for situations like the following: ``` > [[foo]; [5] [6]] | where foo < 3 | sort-by bar ╭────────────╮ │ empty list │ ╰────────────╯ ``` I think there's a strong argument that `[]` is the best output for these commands as well, since it makes pipelines like `$table | filter $condition | sort-by $column` more predictable. Currently, this pipeline will throw an error if `filter` evaluates to `[]`, but work fine otherwise. This makes it difficult to write reliable code, especially since users are not likely to encounter the `filter -> []` case in testing (issue #5957). The only workaround is to insert manual checks for an empty result. IMO, this is significantly worse than the "you can typo a column name without getting an error" problem shown above. Other commands that take column arguments (`get`, `select`, `rename`, etc) already have `[] -> []`, so there's existing precedent for this behavior. The core question here is "what columns does `[]` have"? The current behavior of `sort-by` is "no columns", while the current behavior of `select` is "all possible columns". Both answers lead to accepting some likely-buggy code without throwing on error, but in order to do better here we would need something like `Value::Table` that tracks columns on empty tables. If other people disagree with this logic, I'm happy to split out the `sort-by` and `uniq-by` changes into another PR. # User-Facing Changes `sort`, `uniq`, `sort-by`, and `uniq-by` now return `[]` instead of throwing an error when input is `[]`. # After Submitting > If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. The existing behavior was not documented, and the new behavior is what you would expect by default, so I don't think we need to update documentation. --------- Co-authored-by: Reilly Wood <reilly.wood@icloud.com> |
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Leon
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5c1606ed82
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Add -n flag to sort (formerly only available on sort-by) (#7293)
# Description * `-n`, `--natural` flag from `sort-by` is now on the plain `sort`. * The `-i`, `-n` and `-r` flags now work with single record sorting (formerly they didn't) # User-Facing Changes See above. # Tests + Formatting Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass # After Submitting If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. |
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Reilly Wood
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2201bd9b09
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Require column name(s) in sort-by (#7041) |