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use crate::prelude::*;
use nu_engine::WholeStreamCommand;
use nu_errors::{CoerceInto, ShellError};
use nu_protocol::{Primitive, Signature, UnspannedPathMember, UntaggedValue, Value};
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) -> Result<OutputStream, ShellError> {
to_yaml(args)
}
}
pub fn value_to_yaml_value(v: &Value) -> Result<serde_yaml::Value, ShellError> {
Ok(match &v.value {
UntaggedValue::Primitive(Primitive::Boolean(b)) => serde_yaml::Value::Bool(*b),
UntaggedValue::Primitive(Primitive::Filesize(b)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(b.to_f64().ok_or_else(|| {
ShellError::labeled_error(
"Could not convert to bytes",
"could not convert to bytes",
&v.tag,
)
})?))
}
UntaggedValue::Primitive(Primitive::Duration(i)) => {
serde_yaml::Value::String(i.to_string())
}
UntaggedValue::Primitive(Primitive::Date(d)) => serde_yaml::Value::String(d.to_string()),
UntaggedValue::Primitive(Primitive::EndOfStream) => serde_yaml::Value::Null,
UntaggedValue::Primitive(Primitive::BeginningOfStream) => serde_yaml::Value::Null,
UntaggedValue::Primitive(Primitive::Decimal(f)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(f.to_f64().ok_or_else(|| {
ShellError::labeled_error(
"Could not convert to decimal",
"could not convert to decimal",
&v.tag,
)
})?))
}
UntaggedValue::Primitive(Primitive::Int(i)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(*i))
}
UntaggedValue::Primitive(Primitive::BigInt(i)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(CoerceInto::<i64>::coerce_into(
i.tagged(&v.tag),
"converting to YAML number",
)?))
}
UntaggedValue::Primitive(Primitive::Nothing) => serde_yaml::Value::Null,
UntaggedValue::Primitive(Primitive::GlobPattern(s)) => serde_yaml::Value::String(s.clone()),
UntaggedValue::Primitive(Primitive::String(s)) => serde_yaml::Value::String(s.clone()),
UntaggedValue::Primitive(Primitive::ColumnPath(path)) => {
let mut out = vec![];
for member in path {
match &member.unspanned {
UnspannedPathMember::String(string) => {
out.push(serde_yaml::Value::String(string.clone()))
}
UnspannedPathMember::Int(int) => {
out.push(serde_yaml::Value::Number(serde_yaml::Number::from(*int)))
}
}
}
serde_yaml::Value::Sequence(out)
}
UntaggedValue::Primitive(Primitive::FilePath(s)) => {
serde_yaml::Value::String(s.display().to_string())
}
UntaggedValue::Table(l) => {
let mut out = vec![];
for value in l {
out.push(value_to_yaml_value(value)?);
}
serde_yaml::Value::Sequence(out)
}
UntaggedValue::Error(e) => return Err(e.clone()),
UntaggedValue::Block(_) | UntaggedValue::Primitive(Primitive::Range(_)) => {
serde_yaml::Value::Null
}
#[cfg(feature = "dataframe")]
UntaggedValue::DataFrame(_) | UntaggedValue::FrameStruct(_) => serde_yaml::Value::Null,
UntaggedValue::Primitive(Primitive::Binary(b)) => serde_yaml::Value::Sequence(
b.iter()
.map(|x| serde_yaml::Value::Number(serde_yaml::Number::from(*x)))
.collect(),
),
UntaggedValue::Row(o) => {
let mut m = serde_yaml::Mapping::new();
for (k, v) in &o.entries {
m.insert(
serde_yaml::Value::String(k.clone()),
value_to_yaml_value(v)?,
);
}
serde_yaml::Value::Mapping(m)
}
})
}
fn to_yaml(args: CommandArgs) -> Result<OutputStream, ShellError> {
let name_tag = args.name_tag();
let name_span = name_tag.span;
let input: Vec<Value> = args.input.collect();
let to_process_input = match input.len() {
x if x > 1 => {
let tag = input[0].tag.clone();
vec![Value {
value: UntaggedValue::Table(input),
tag,
}]
}
1 => input,
_ => vec![],
};
Ok((to_process_input.into_iter().map(move |value| {
let value_span = value.tag.span;
match value_to_yaml_value(&value) {
Ok(yaml_value) => match serde_yaml::to_string(&yaml_value) {
Ok(x) => UntaggedValue::Primitive(Primitive::String(x)).into_value(&name_tag),
_ => Value::error(ShellError::labeled_error_with_secondary(
"Expected a table with YAML-compatible structure from pipeline",
"requires YAML-compatible input",
name_span,
"originates from here".to_string(),
value_span,
)),
},
_ => Value::error(ShellError::labeled_error(
"Expected a table with YAML-compatible structure from pipeline",
"requires YAML-compatible input",
&name_tag,
)),
}
}))
.into_output_stream())
}
#[cfg(test)]
mod tests {
use super::ShellError;
use super::ToYaml;
#[test]
fn examples_work_as_expected() -> Result<(), ShellError> {
use crate::examples::test as test_examples;
test_examples(ToYaml {})
}
}
