nushell/src/commands/to_yaml.rs

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use crate::commands::WholeStreamCommand;
use crate::data::{Primitive, Value};
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use crate::prelude::*;
pub struct ToYAML;
impl WholeStreamCommand for ToYAML {
fn name(&self) -> &str {
"to-yaml"
}
fn signature(&self) -> Signature {
Signature::build("to-yaml")
}
fn usage(&self) -> &str {
"Convert table into .yaml/.yml text"
}
fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
to_yaml(args, registry)
}
}
pub fn value_to_yaml_value(v: &Tagged<Value>) -> Result<serde_yaml::Value, ShellError> {
Ok(match v.item() {
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Value::Primitive(Primitive::Boolean(b)) => serde_yaml::Value::Bool(*b),
Value::Primitive(Primitive::Bytes(b)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(b.to_f64().unwrap()))
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}
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Value::Primitive(Primitive::Duration(secs)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(secs.to_f64().unwrap()))
}
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Value::Primitive(Primitive::Date(d)) => serde_yaml::Value::String(d.to_string()),
Value::Primitive(Primitive::EndOfStream) => serde_yaml::Value::Null,
Value::Primitive(Primitive::BeginningOfStream) => serde_yaml::Value::Null,
Value::Primitive(Primitive::Decimal(f)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(f.to_f64().unwrap()))
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}
Value::Primitive(Primitive::Int(i)) => serde_yaml::Value::Number(serde_yaml::Number::from(
CoerceInto::<i64>::coerce_into(i.tagged(&v.tag), "converting to YAML number")?,
)),
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Value::Primitive(Primitive::Nothing) => serde_yaml::Value::Null,
Value::Primitive(Primitive::Pattern(s)) => serde_yaml::Value::String(s.clone()),
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Value::Primitive(Primitive::String(s)) => serde_yaml::Value::String(s.clone()),
Value::Primitive(Primitive::Path(s)) => serde_yaml::Value::String(s.display().to_string()),
Value::Table(l) => {
let mut out = vec![];
for value in l {
out.push(value_to_yaml_value(value)?);
}
serde_yaml::Value::Sequence(out)
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}
Value::Error(e) => return Err(e.clone()),
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Value::Block(_) => serde_yaml::Value::Null,
Value::Primitive(Primitive::Binary(b)) => serde_yaml::Value::Sequence(
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b.iter()
.map(|x| serde_yaml::Value::Number(serde_yaml::Number::from(*x)))
.collect(),
),
Value::Row(o) => {
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let mut m = serde_yaml::Mapping::new();
for (k, v) in o.entries.iter() {
m.insert(
serde_yaml::Value::String(k.clone()),
value_to_yaml_value(v)?,
);
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}
serde_yaml::Value::Mapping(m)
}
})
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}
fn to_yaml(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let args = args.evaluate_once(registry)?;
let name_tag = args.name_tag();
let stream = async_stream! {
let input: Vec<Tagged<Value>> = args.input.values.collect().await;
let to_process_input = if input.len() > 1 {
let tag = input[0].tag.clone();
vec![Tagged { item: Value::Table(input), tag } ]
} else if input.len() == 1 {
input
} else {
vec![]
};
for value in to_process_input {
match value_to_yaml_value(&value) {
Ok(yaml_value) => {
match serde_yaml::to_string(&yaml_value) {
Ok(x) => yield ReturnSuccess::value(
Value::Primitive(Primitive::String(x)).tagged(&name_tag),
),
_ => yield Err(ShellError::labeled_error_with_secondary(
"Expected a table with YAML-compatible structure.tag() from pipeline",
"requires YAML-compatible input",
&name_tag,
"originates from here".to_string(),
value.tag(),
)),
}
}
_ => yield Err(ShellError::labeled_error(
"Expected a table with YAML-compatible structure from pipeline",
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"requires YAML-compatible input",
&name_tag))
}
}
};
Ok(stream.to_output_stream())
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}