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62
crates/nu-command/src/filters/where_.rs
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@ -10,13 +10,21 @@ impl Command for Where {
}
fn description(&self) -> &str {
"Filter values based on a row condition."
"Filter values of an input list based on a condition."
}
fn extra_description(&self) -> &str {
r#"This command works similar to 'filter' but allows extra shorthands for working with
tables, known as "row conditions". On the other hand, reading the condition from a variable is
not supported."#
r#"A condition is evaluated for each element of the input, and only elements which meet the condition are included in the output.
A condition can be either a "row condition" or a closure. A row condition is a special short-hand syntax to simplify field access.
Each element of the input can be accessed through the $it variable.
On the left hand side of a row condition, any field name is automatically expanded to use $it.
For example, where type == dir is equivalent to where $it.type == dir. This expansion does not happen when passing a subexpression or closure to where.
When using a closure, the element is passed as an argument and as pipeline input to the closure.
`where` supports closure literals, but not closures stored in a variable. To filter using a closure stored in a variable, use the `filter` command."#
}
fn command_type(&self) -> CommandType {
@ -34,9 +42,12 @@ not supported."#
(Type::Range, Type::Any),
])
.required(
"row_condition",
SyntaxShape::RowCondition,
"Filter condition.",
"condition",
SyntaxShape::OneOf(vec![
SyntaxShape::RowCondition,
SyntaxShape::Closure(Some(vec![SyntaxShape::Any])),
]),
"Filter row condition or closure.",
)
.allow_variants_without_examples(true)
.category(Category::Filters)
@ -85,11 +96,9 @@ not supported."#
)),
},
Example {
description: "Filter items of a list according to a condition",
example: "[1 2] | where {|x| $x > 1}",
result: Some(Value::test_list(
vec![Value::test_int(2)],
)),
description: "List only the files in the current directory",
example: "ls | where type == file",
result: None,
},
Example {
description: "List all files in the current directory with sizes greater than 2kb",
@ -97,13 +106,8 @@ not supported."#
result: None,
},
Example {
description: "List only the files in the current directory",
example: "ls | where type == file",
result: None,
},
Example {
description: "List all files with names that contain \"Car\"",
example: "ls | where name =~ \"Car\"",
description: r#"List all files with names that contain "Car""#,
example: r#"ls | where name =~ "Car""#,
result: None,
},
Example {
@ -111,18 +115,32 @@ not supported."#
example: "ls | where modified >= (date now) - 2wk",
result: None,
},
Example {
description: "Filter items of a list with a row condition",
example: "[1 2 3 4 5] | where $it > 2",
result: Some(Value::test_list(
vec![Value::test_int(3), Value::test_int(4), Value::test_int(5)],
)),
},
Example {
description: "Filter items of a list with a closure",
example: "[1 2 3 4 5] | where {|x| $x > 2 }",
result: Some(Value::test_list(
vec![Value::test_int(3), Value::test_int(4), Value::test_int(5)],
)),
},
Example {
description: "Find files whose filenames don't begin with the correct sequential number",
example: "ls | where type == file | sort-by name --natural | enumerate | where {|e| $e.item.name !~ $'^($e.index + 1)' } | each {|| get item }",
example: "ls | where type == file | sort-by name --natural | enumerate | where {|e| $e.item.name !~ $'^($e.index + 1)' } | get item",
result: None,
},
Example {
description: r#"Find case-insensitively files called "readme", without an explicit closure"#,
description: r#"Find case-insensitively files called "readme", with a subexpression"#,
example: "ls | where ($it.name | str downcase) =~ readme",
result: None,
},
Example {
description: "same as above but with regex only",
description: r#"Find case-insensitively files called "readme", with regex only"#,
example: "ls | where name =~ '(?i)readme'",
result: None,
}