add "into int" behavior (#3279)

* add 'int' command

* create `into int` behavior

- forcibly overwrote prior implementation

```sh
git mv -f  crates/nu-command/src/commands/int_.rs crates/nu-command/src/commands/into_int.rs
```
- picked up prior work, polished and renamed

Co-authored-by: Saeed Rasooli <saeed.gnu@gmail.com>

crates/nu-command/src/commands/into_int.rs

@@ -1,28 +1,33 @@
 use crate::prelude::*;
 use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
-use nu_protocol::{Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
+use nu_protocol::{
+    ColumnPath, Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value,
+};
 
-use num_bigint::ToBigInt;
+use num_bigint::{BigInt, ToBigInt};
 
 pub struct IntoInt;
 
 #[derive(Deserialize)]
 pub struct IntoIntArgs {
-    pub rest: Vec<Value>,
+    pub rest: Vec<ColumnPath>,
 }
 
 impl WholeStreamCommand for IntoInt {
     fn name(&self) -> &str {
-        "into-int"
+        "into int"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("into-int").rest(SyntaxShape::Any, "the values to into-int")
+        Signature::build("into int").rest(
+            SyntaxShape::ColumnPath,
+            "column paths to convert to int (for table input)",
+        )
     }
 
     fn usage(&self) -> &str {
-        "Convert value to integer."
+        "Convert value to integer"
     }
 
     fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
@@ -32,45 +37,136 @@ impl WholeStreamCommand for IntoInt {
     fn examples(&self) -> Vec<Example> {
         vec![
             Example {
-                description: "Convert filesize to integer",
+                description: "Convert string to integer in table",
-                example: "into-int 1kb | each { = $it / 1000 }",
+                example: "echo [[num]; ['-5'] [4] [1.5]] | into int num",
-                result: Some(vec![UntaggedValue::int(1).into()]),
+                result: Some(vec![
+                    UntaggedValue::row(indexmap! {
+                        "num".to_string() => UntaggedValue::int(-5).into(),
+                    })
+                    .into(),
+                    UntaggedValue::row(indexmap! {
+                        "num".to_string() => UntaggedValue::int(4).into(),
+                    })
+                    .into(),
+                    UntaggedValue::row(indexmap! {
+                        "num".to_string() => UntaggedValue::int(1).into(),
+                    })
+                    .into(),
+                ]),
             },
             Example {
-                description: "Convert filesize to integer",
+                description: "Convert string to integer",
-                example: "into-int 1kib | each { = $it / 1024 }",
+                example: "echo '2' | into int",
-                result: Some(vec![UntaggedValue::int(1).into()]),
+                result: Some(vec![UntaggedValue::int(2).into()]),
+            },
+            Example {
+                description: "Convert decimal to integer",
+                example: "echo 5.9 | into int",
+                result: Some(vec![UntaggedValue::int(5).into()]),
+            },
+            Example {
+                description: "Convert decimal string to integer",
+                example: "echo '5.9' | into int",
+                result: Some(vec![UntaggedValue::int(5).into()]),
+            },
+            Example {
+                description: "Convert file size to integer",
+                example: "echo 4KB | into int",
+                result: Some(vec![UntaggedValue::int(4000).into()]),
+            },
+            Example {
+                description: "Convert bool to integer",
+                example: "echo $false $true | into int",
+                result: Some(vec![
+                    UntaggedValue::int(0).into(),
+                    UntaggedValue::int(1).into(),
+                ]),
             },
         ]
     }
 }
 
 fn into_int(args: CommandArgs) -> Result<OutputStream, ShellError> {
-    let (args, _): (IntoIntArgs, _) = args.process()?;
+    let (IntoIntArgs { rest: column_paths }, input) = args.process()?;
 
-    let stream = args.rest.into_iter().map(|i| match i {
+    Ok(input
-        Value {
+        .map(move |v| {
-            value: UntaggedValue::Primitive(primitive_val),
+            if column_paths.is_empty() {
+                ReturnSuccess::value(action(&v, v.tag())?)
+            } else {
+                let mut ret = v;
+                for path in &column_paths {
+                    ret = ret.swap_data_by_column_path(
+                        path,
+                        Box::new(move |old| action(old, old.tag())),
+                    )?;
+                }
+
+                ReturnSuccess::value(ret)
+            }
+        })
+        .to_output_stream())
+}
+
+pub fn action(input: &Value, tag: impl Into<Tag>) -> Result<Value, ShellError> {
+    let tag = tag.into();
+    match &input.value {
+        UntaggedValue::Primitive(prim) => Ok(UntaggedValue::int(match prim {
+            Primitive::String(a_string) => match int_from_string(a_string, &tag) {
+                Ok(n) => n,
+                Err(e) => {
+                    return Err(e);
+                }
+            },
+            Primitive::Decimal(dec) => match dec.to_bigint() {
+                Some(n) => n,
+                None => {
+                    return Err(ShellError::unimplemented(
+                        "failed to convert decimal to int",
+                    ));
+                }
+            },
+            Primitive::Int(n_ref) => n_ref.to_bigint().expect("unexpected error"),
+            Primitive::Boolean(a_bool) => match a_bool {
+                false => 0.to_bigint().expect("unexpected error"),
+                true => 1.to_bigint().expect("unexpected error"),
+            },
+            Primitive::Filesize(a_filesize) => a_filesize
+                .to_bigint()
+                .expect("Conversion should never fail."),
+            _ => {
+                return Err(ShellError::unimplemented(
+                    "'int' for non-numeric primitives",
+                ))
+            }
+        })
+        .into_value(&tag)),
+        UntaggedValue::Row(_) => Err(ShellError::labeled_error(
+            "specify column name to use, with 'int COLUMN'",
+            "found table",
             tag,
-        } => match primitive_val {
+        )),
-            Primitive::Filesize(size) => OutputStream::one(Ok(ReturnSuccess::Value(Value {
+        _ => Err(ShellError::unimplemented("'int' for unsupported type")),
-                value: UntaggedValue::int(size.to_bigint().expect("Conversion should never fail.")),
+    }
-                tag,
+}
-            }))),
-            Primitive::Int(_) => OutputStream::one(Ok(ReturnSuccess::Value(Value {
-                value: UntaggedValue::Primitive(primitive_val),
-                tag,
-            }))),
-            _ => OutputStream::one(Err(ShellError::labeled_error(
-                "Could not convert int value",
-                "original value",
-                tag,
-            ))),
-        },
-        _ => OutputStream::one(Ok(ReturnSuccess::Value(i))),
-    });
 
-    Ok(stream.flatten().to_output_stream())
+fn int_from_string(a_string: &str, tag: &Tag) -> Result<BigInt, ShellError> {
+    match a_string.parse::<BigInt>() {
+        Ok(n) => Ok(n),
+        Err(_) => match a_string.parse::<f64>() {
+            Ok(res_float) => match res_float.to_bigint() {
+                Some(n) => Ok(n),
+                None => Err(ShellError::unimplemented(
+                    "failed to convert decimal to int",
+                )),
+            },
+            Err(_) => Err(ShellError::labeled_error(
+                "Could not convert string value to int",
+                "original value",
+                tag.clone(),
+            )),
+        },
+    }
 }
 
 #[cfg(test)]

crates/nu-command/tests/commands/into_int.rs

@@ -5,7 +5,7 @@ fn into_int_filesize() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-        into-int 1kb | each {= $it / 1000 }
+        echo 1kb | into int | each {= $it / 1000 }
         "#
     ));
 
@@ -17,7 +17,7 @@ fn into_int_filesize2() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-        into-int 1kib | each {= $it / 1024 }
+        echo 1kib | into int | each {= $it / 1024 }
         "#
     ));
 
@@ -29,7 +29,7 @@ fn into_int_int() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-        into-int 1024 | each {= $it / 1024 }
+        echo 1024 | into int | each {= $it / 1024 }
         "#
     ));