Add initial batch of into conversions

crates/nu-command/src/conversions/into/binary.rs

@@ -0,0 +1,171 @@
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EvaluationContext},
+    Example, ShellError, Signature, Span, SyntaxShape, Value,
+};
+
+pub struct SubCommand;
+
+impl Command for SubCommand {
+    fn name(&self) -> &str {
+        "into binary"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("into binary").rest(
+            "rest",
+            SyntaxShape::CellPath,
+            "column paths to convert to binary (for table input)",
+        )
+    }
+
+    fn usage(&self) -> &str {
+        "Convert value to a binary primitive"
+    }
+
+    fn run(
+        &self,
+        context: &EvaluationContext,
+        call: &Call,
+        input: Value,
+    ) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
+        into_binary(context, call, input)
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "convert string to a nushell binary primitive",
+                example: "'This is a string that is exactly 52 characters long.' | into binary",
+                result: Some(Value::Binary {
+                    val: "This is a string that is exactly 52 characters long."
+                        .to_string()
+                        .as_bytes()
+                        .to_vec(),
+                    span: Span::unknown(),
+                }),
+            },
+            Example {
+                description: "convert a number to a nushell binary primitive",
+                example: "1 | into binary",
+                result: Some(Value::Binary {
+                    val: i64::from(1).to_le_bytes().to_vec(),
+                    span: Span::unknown(),
+                }),
+            },
+            Example {
+                description: "convert a boolean to a nushell binary primitive",
+                example: "$true | into binary",
+                result: Some(Value::Binary {
+                    val: i64::from(1).to_le_bytes().to_vec(),
+                    span: Span::unknown(),
+                }),
+            },
+            Example {
+                description: "convert a filesize to a nushell binary primitive",
+                example: "ls | where name == LICENSE | get size | into binary",
+                result: None,
+            },
+            Example {
+                description: "convert a filepath to a nushell binary primitive",
+                example: "ls | where name == LICENSE | get name | path expand | into binary",
+                result: None,
+            },
+            Example {
+                description: "convert a decimal to a nushell binary primitive",
+                example: "1.234 | into binary",
+                result: Some(Value::Binary {
+                    val: 1.234f64.to_le_bytes().to_vec(),
+                    span: Span::unknown(),
+                }),
+            },
+        ]
+    }
+}
+
+fn into_binary(
+    _context: &EvaluationContext,
+    call: &Call,
+    input: Value,
+) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
+    let head = call.head;
+    // let column_paths: Vec<CellPath> = call.rest(context, 0)?;
+
+    input.map(head, move |v| {
+        action(v, head)
+        // FIXME: Add back in column path support
+        // if column_paths.is_empty() {
+        //     action(v, head)
+        // } else {
+        //     let mut ret = v;
+        //     for path in &column_paths {
+        //         ret =
+        //             ret.swap_data_by_cell_path(path, Box::new(move |old| action(old, old.tag())))?;
+        //     }
+
+        //     Ok(ret)
+        // }
+    })
+}
+
+fn int_to_endian(n: i64) -> Vec<u8> {
+    if cfg!(target_endian = "little") {
+        n.to_le_bytes().to_vec()
+    } else {
+        n.to_be_bytes().to_vec()
+    }
+}
+
+fn float_to_endian(n: f64) -> Vec<u8> {
+    if cfg!(target_endian = "little") {
+        n.to_le_bytes().to_vec()
+    } else {
+        n.to_be_bytes().to_vec()
+    }
+}
+
+pub fn action(input: Value, span: Span) -> Value {
+    match input {
+        Value::Binary { .. } => input,
+        Value::Int { val, .. } => Value::Binary {
+            val: int_to_endian(val),
+            span,
+        },
+        Value::Float { val, .. } => Value::Binary {
+            val: float_to_endian(val),
+            span,
+        },
+        Value::Filesize { val, .. } => Value::Binary {
+            val: int_to_endian(val),
+            span,
+        },
+        Value::String { val, .. } => Value::Binary {
+            val: val.as_bytes().to_vec(),
+            span,
+        },
+        Value::Bool { val, .. } => Value::Binary {
+            val: int_to_endian(if val { 1i64 } else { 0 }),
+            span,
+        },
+        Value::Date { val, .. } => Value::Binary {
+            val: val.format("%c").to_string().as_bytes().to_vec(),
+            span,
+        },
+
+        _ => Value::Error {
+            error: ShellError::UnsupportedInput("'into binary' for unsupported type".into(), span),
+        },
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_examples() {
+        use crate::test_examples;
+
+        test_examples(SubCommand {})
+    }
+}