use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
Category, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Type, Value,
};
#[derive(Clone)]
pub struct HelpOperators;
impl Command for HelpOperators {
fn name(&self) -> &str {
"help operators"
}
fn usage(&self) -> &str {
"Show help on nushell operators."
}
fn signature(&self) -> Signature {
Signature::build("help operators")
.category(Category::Core)
.input_output_types(vec![(Type::Nothing, Type::Table(vec![]))])
.allow_variants_without_examples(true)
}
fn run(
&self,
engine_state: &EngineState,
_stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<PipelineData, ShellError> {
let head = call.head;
let op_info = generate_operator_info();
let mut recs = vec![];
for op in op_info {
let mut cols = vec![];
let mut vals = vec![];
cols.push("type".into());
vals.push(Value::string(op.op_type, head));
cols.push("operator".into());
vals.push(Value::string(op.operator, head));
cols.push("name".into());
vals.push(Value::string(op.name, head));
cols.push("description".into());
vals.push(Value::string(op.description, head));
cols.push("precedence".into());
vals.push(Value::int(op.precedence, head));
recs.push(Value::Record {
cols,
vals,
span: head,
})
}
Ok(recs
.into_iter()
.into_pipeline_data(engine_state.ctrlc.clone()))
}
}
struct OperatorInfo {
op_type: String,
operator: String,
name: String,
description: String,
precedence: i64,
}
fn generate_operator_info() -> Vec<OperatorInfo> {
vec![
OperatorInfo {
op_type: "Assignment".into(),
operator: "=".into(),
name: "Assign".into(),
description: "Assigns a value to a variable.".into(),
precedence: 10,
},
OperatorInfo {
op_type: "Assignment".into(),
operator: "+=".into(),
name: "PlusAssign".into(),
description: "Adds a value to a variable.".into(),
precedence: 10,
},
OperatorInfo {
op_type: "Assignment".into(),
operator: "++=".into(),
name: "AppendAssign".into(),
description: "Appends a list or a value to a variable.".into(),
precedence: 10,
},
OperatorInfo {
op_type: "Assignment".into(),
operator: "-=".into(),
name: "MinusAssign".into(),
description: "Subtracts a value from a variable.".into(),
precedence: 10,
},
OperatorInfo {
op_type: "Assignment".into(),
operator: "*=".into(),
name: "MultiplyAssign".into(),
description: "Multiplies a variable by a value.".into(),
precedence: 10,
},
OperatorInfo {
op_type: "Assignment".into(),
operator: "/=".into(),
name: "DivideAssign".into(),
description: "Divides a variable by a value.".into(),
precedence: 10,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "==".into(),
name: "Equal".into(),
description: "Checks if two values are equal.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "!=".into(),
name: "NotEqual".into(),
description: "Checks if two values are not equal.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "<".into(),
name: "LessThan".into(),
description: "Checks if a value is less than another.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "<=".into(),
name: "LessThanOrEqual".into(),
description: "Checks if a value is less than or equal to another.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: ">".into(),
name: "GreaterThan".into(),
description: "Checks if a value is greater than another.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: ">=".into(),
name: "GreaterThanOrEqual".into(),
description: "Checks if a value is greater than or equal to another.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "=~".into(),
name: "RegexMatch".into(),
description: "Checks if a value matches a regular expression.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "!~".into(),
name: "NotRegexMatch".into(),
description: "Checks if a value does not match a regular expression.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "in".into(),
name: "In".into(),
description: "Checks if a value is in a list or string.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "not-in".into(),
name: "NotIn".into(),
description: "Checks if a value is not in a list or string.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "starts-with".into(),
name: "StartsWith".into(),
description: "Checks if a string starts with another.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "ends-with".into(),
name: "EndsWith".into(),
description: "Checks if a string ends with another.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Comparison".into(),
operator: "not".into(),
name: "UnaryNot".into(),
description: "Negates a value or expression.".into(),
precedence: 0,
},
OperatorInfo {
op_type: "Math".into(),
operator: "+".into(),
name: "Plus".into(),
description: "Adds two values.".into(),
precedence: 90,
},
OperatorInfo {
op_type: "Math".into(),
operator: "++".into(),
name: "Append".into(),
description: "Appends two lists or a list and a value.".into(),
precedence: 80,
},
OperatorInfo {
op_type: "Math".into(),
operator: "-".into(),
name: "Minus".into(),
description: "Subtracts two values.".into(),
precedence: 90,
},
OperatorInfo {
op_type: "Math".into(),
operator: "*".into(),
name: "Multiply".into(),
description: "Multiplies two values.".into(),
precedence: 95,
},
OperatorInfo {
op_type: "Math".into(),
operator: "/".into(),
name: "Divide".into(),
description: "Divides two values.".into(),
precedence: 95,
},
OperatorInfo {
op_type: "Math".into(),
operator: "//".into(),
name: "FloorDivision".into(),
description: "Divides two values and floors the result.".into(),
precedence: 95,
},
OperatorInfo {
op_type: "Math".into(),
operator: "mod".into(),
name: "Modulo".into(),
description: "Divides two values and returns the remainder.".into(),
precedence: 95,
},
OperatorInfo {
op_type: "Math".into(),
operator: "**".into(),
name: "Pow ".into(),
description: "Raises one value to the power of another.".into(),
precedence: 100,
},
OperatorInfo {
op_type: "Bitwise".into(),
operator: "bit-or".into(),
name: "BitOr".into(),
description: "Performs a bitwise OR on two values.".into(),
precedence: 60,
},
OperatorInfo {
op_type: "Bitwise".into(),
operator: "bit-xor".into(),
name: "BitXor".into(),
description: "Performs a bitwise XOR on two values.".into(),
precedence: 70,
},
OperatorInfo {
op_type: "Bitwise".into(),
operator: "bit-and".into(),
name: "BitAnd".into(),
description: "Performs a bitwise AND on two values.".into(),
precedence: 75,
},
OperatorInfo {
op_type: "Bitwise".into(),
operator: "bit-shl".into(),
name: "ShiftLeft".into(),
description: "Shifts a value left by another.".into(),
precedence: 85,
},
OperatorInfo {
op_type: "Bitwise".into(),
operator: "bit-shr".into(),
name: "ShiftRight".into(),
description: "Shifts a value right by another.".into(),
precedence: 85,
},
OperatorInfo {
op_type: "Boolean".into(),
operator: "and".into(),
name: "And".into(),
description: "Checks if two values are true.".into(),
precedence: 50,
},
OperatorInfo {
op_type: "Boolean".into(),
operator: "or".into(),
name: "Or".into(),
description: "Checks if either value is true.".into(),
precedence: 40,
},
OperatorInfo {
op_type: "Boolean".into(),
operator: "xor".into(),
name: "Xor".into(),
description: "Checks if one value is true and the other is false.".into(),
precedence: 45,
},
]
}
#[cfg(test)]
mod test {
#[test]
fn test_examples() {
use super::HelpOperators;
use crate::test_examples;
test_examples(HelpOperators {})
}
}