1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use crate::prelude::*;
use indexmap::{indexmap, IndexMap};
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
use nu_source::Tagged;

const DEFAULT_COLUMN_NAME: &str = "Column";

pub struct Wrap;

impl WholeStreamCommand for Wrap {
    fn name(&self) -> &str {
        "wrap"
    }

    fn signature(&self) -> Signature {
        Signature::build("wrap").optional(
            "column",
            SyntaxShape::String,
            "the name of the new column",
        )
    }

    fn usage(&self) -> &str {
        "Wraps the given data in a table."
    }

    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
        wrap(args)
    }

    fn examples(&self) -> Vec<Example> {
        vec![
            Example {
                description: "Wrap a list into a table with the default column name",
                example: "echo [1 2 3] | wrap",
                result: Some(vec![
                    UntaggedValue::row(indexmap! {
                        DEFAULT_COLUMN_NAME.to_string() => UntaggedValue::int(1).into(),
                    })
                    .into(),
                    UntaggedValue::row(indexmap! {
                        DEFAULT_COLUMN_NAME.to_string() => UntaggedValue::int(2).into(),
                    })
                    .into(),
                    UntaggedValue::row(indexmap! {
                        DEFAULT_COLUMN_NAME.to_string() => UntaggedValue::int(3).into(),
                    })
                    .into(),
                ]),
            },
            Example {
                description: "Wrap a list into a table with a given column name",
                example: "echo [1 2 3] | wrap MyColumn",
                result: Some(vec![
                    UntaggedValue::row(indexmap! {
                        "MyColumn".to_string() => UntaggedValue::int(1).into(),
                    })
                    .into(),
                    UntaggedValue::row(indexmap! {
                        "MyColumn".to_string() => UntaggedValue::int(2).into(),
                    })
                    .into(),
                    UntaggedValue::row(indexmap! {
                        "MyColumn".to_string() => UntaggedValue::int(3).into(),
                    })
                    .into(),
                ]),
            },
        ]
    }
}

fn wrap(args: CommandArgs) -> Result<ActionStream, ShellError> {
    let column: Option<Tagged<String>> = args.opt(0)?;

    let mut result_table = vec![];
    let mut are_all_rows = true;

    for value in args.input {
        match value {
            Value {
                value: UntaggedValue::Row(_),
                ..
            } => {
                result_table.push(value);
            }
            _ => {
                are_all_rows = false;

                let mut index_map = IndexMap::new();
                index_map.insert(
                    match &column {
                        Some(key) => key.item.clone(),
                        None => DEFAULT_COLUMN_NAME.to_string(),
                    },
                    value,
                );

                result_table.push(UntaggedValue::row(index_map).into_value(Tag::unknown()));
            }
        }
    }

    if are_all_rows {
        let mut index_map = IndexMap::new();
        index_map.insert(
            match &column {
                Some(key) => key.item.clone(),
                None => DEFAULT_COLUMN_NAME.to_string(),
            },
            UntaggedValue::table(&result_table).into_value(Tag::unknown()),
        );

        let row = UntaggedValue::row(index_map).into_untagged_value();

        Ok(ActionStream::one(ReturnSuccess::value(row)))
    } else {
        Ok((result_table.into_iter().map(ReturnSuccess::value)).into_action_stream())
    }
}

#[cfg(test)]
mod tests {
    use super::ShellError;
    use super::Wrap;

    #[test]
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

        test_examples(Wrap {})
    }
}