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yaml.rs
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yaml.rs
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use nu_protocol::ast::{Call, PathMember};
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, Type, Value,
};
#[derive(Clone)]
pub struct ToYaml;
impl Command for ToYaml {
fn name(&self) -> &str {
"to yaml"
}
fn signature(&self) -> Signature {
Signature::build("to yaml")
.input_output_types(vec![(Type::Any, Type::String)])
.category(Category::Formats)
}
fn usage(&self) -> &str {
"Convert table into .yaml/.yml text."
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Outputs an YAML string representing the contents of this table",
example: r#"[[foo bar]; ["1" "2"]] | to yaml"#,
result: Some(Value::test_string("- foo: '1'\n bar: '2'\n")),
}]
}
fn run(
&self,
_engine_state: &EngineState,
_stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let head = call.head;
let input = input.try_expand_range()?;
to_yaml(input, head)
}
}
pub fn value_to_yaml_value(v: &Value) -> Result<serde_yaml::Value, ShellError> {
Ok(match &v {
Value::Bool { val, .. } => serde_yaml::Value::Bool(*val),
Value::Int { val, .. } => serde_yaml::Value::Number(serde_yaml::Number::from(*val)),
Value::Filesize { val, .. } => serde_yaml::Value::Number(serde_yaml::Number::from(*val)),
Value::Duration { val, .. } => serde_yaml::Value::String(val.to_string()),
Value::Date { val, .. } => serde_yaml::Value::String(val.to_string()),
Value::Range { .. } => serde_yaml::Value::Null,
Value::Float { val, .. } => serde_yaml::Value::Number(serde_yaml::Number::from(*val)),
Value::String { val, .. } | Value::Glob { val, .. } => {
serde_yaml::Value::String(val.clone())
}
Value::Record { val, .. } => {
let mut m = serde_yaml::Mapping::new();
for (k, v) in &**val {
m.insert(
serde_yaml::Value::String(k.clone()),
value_to_yaml_value(v)?,
);
}
serde_yaml::Value::Mapping(m)
}
Value::LazyRecord { val, .. } => {
let collected = val.collect()?;
value_to_yaml_value(&collected)?
}
Value::List { vals, .. } => {
let mut out = vec![];
for value in vals {
out.push(value_to_yaml_value(value)?);
}
serde_yaml::Value::Sequence(out)
}
Value::Block { .. } => serde_yaml::Value::Null,
Value::Closure { .. } => serde_yaml::Value::Null,
Value::Nothing { .. } => serde_yaml::Value::Null,
Value::Error { error, .. } => return Err(*error.clone()),
Value::Binary { val, .. } => serde_yaml::Value::Sequence(
val.iter()
.map(|x| serde_yaml::Value::Number(serde_yaml::Number::from(*x)))
.collect(),
),
Value::CellPath { val, .. } => serde_yaml::Value::Sequence(
val.members
.iter()
.map(|x| match &x {
PathMember::String { val, .. } => Ok(serde_yaml::Value::String(val.clone())),
PathMember::Int { val, .. } => {
Ok(serde_yaml::Value::Number(serde_yaml::Number::from(*val)))
}
})
.collect::<Result<Vec<serde_yaml::Value>, ShellError>>()?,
),
Value::CustomValue { .. } => serde_yaml::Value::Null,
})
}
fn to_yaml(input: PipelineData, head: Span) -> Result<PipelineData, ShellError> {
let value = input.into_value(head);
let yaml_value = value_to_yaml_value(&value)?;
match serde_yaml::to_string(&yaml_value) {
Ok(serde_yaml_string) => Ok(Value::string(serde_yaml_string, head).into_pipeline_data()),
_ => Ok(Value::error(
ShellError::CantConvert {
to_type: "YAML".into(),
from_type: value.get_type().to_string(),
span: head,
help: None,
},
head,
)
.into_pipeline_data()),
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(ToYaml {})
}
}