nushell/src/commands/to_yaml.rs

152 lines
5.7 KiB
Rust
Raw Normal View History

use crate::commands::WholeStreamCommand;
2019-07-16 06:05:38 +02:00
use crate::prelude::*;
2019-11-30 01:21:05 +01:00
use nu_errors::{CoerceInto, ShellError};
use nu_protocol::{Primitive, ReturnSuccess, Signature, UnspannedPathMember, UntaggedValue, Value};
2019-07-16 06:05:38 +02:00
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: &Value) -> Result<serde_yaml::Value, ShellError> {
Ok(match &v.value {
UntaggedValue::Primitive(Primitive::Boolean(b)) => serde_yaml::Value::Bool(*b),
UntaggedValue::Primitive(Primitive::Bytes(b)) => {
serde_yaml::Value::Number(serde_yaml::Number::from(b.to_f64().unwrap()))
2019-07-16 06:05:38 +02:00
}
UntaggedValue::Primitive(Primitive::Duration(secs)) => {
2019-11-17 06:48:48 +01:00
serde_yaml::Value::Number(serde_yaml::Number::from(secs.to_f64().unwrap()))
}
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().unwrap()))
2019-07-16 06:05:38 +02:00
}
UntaggedValue::Primitive(Primitive::Int(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::Pattern(s)) => serde_yaml::Value::String(s.clone()),
UntaggedValue::Primitive(Primitive::String(s)) => serde_yaml::Value::String(s.clone()),
UntaggedValue::Primitive(Primitive::Line(s)) => serde_yaml::Value::String(s.clone()),
UntaggedValue::Primitive(Primitive::ColumnPath(path)) => {
2019-11-04 16:47:03 +01:00
let mut out = vec![];
for member in path.iter() {
match &member.unspanned {
UnspannedPathMember::String(string) => {
2019-11-04 16:47:03 +01:00
out.push(serde_yaml::Value::String(string.clone()))
}
UnspannedPathMember::Int(int) => out.push(serde_yaml::Value::Number(
2019-11-04 16:47:03 +01:00
serde_yaml::Number::from(CoerceInto::<i64>::coerce_into(
int.tagged(&member.span),
"converting to YAML number",
)?),
)),
}
}
serde_yaml::Value::Sequence(out)
}
UntaggedValue::Primitive(Primitive::Path(s)) => {
serde_yaml::Value::String(s.display().to_string())
}
2019-07-16 06:05:38 +02:00
UntaggedValue::Table(l) => {
let mut out = vec![];
for value in l {
out.push(value_to_yaml_value(value)?);
}
serde_yaml::Value::Sequence(out)
2019-07-16 06:05:38 +02:00
}
UntaggedValue::Error(e) => return Err(e.clone()),
UntaggedValue::Block(_) => serde_yaml::Value::Null,
UntaggedValue::Primitive(Primitive::Binary(b)) => serde_yaml::Value::Sequence(
2019-07-16 06:05:38 +02:00
b.iter()
.map(|x| serde_yaml::Value::Number(serde_yaml::Number::from(*x)))
.collect(),
),
UntaggedValue::Row(o) => {
2019-07-16 06:05:38 +02:00
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)?,
);
2019-07-16 06:05:38 +02:00
}
serde_yaml::Value::Mapping(m)
}
})
2019-07-16 06:05:38 +02:00
}
fn to_yaml(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
2019-07-24 00:22:11 +02:00
let args = args.evaluate_once(registry)?;
let name_tag = args.name_tag();
let name_span = name_tag.span;
let stream = async_stream! {
let input: Vec<Value> = args.input.values.collect().await;
let to_process_input = if input.len() > 1 {
let tag = input[0].tag.clone();
vec![Value { value: UntaggedValue::Table(input), tag } ]
} else if input.len() == 1 {
input
} else {
vec![]
};
for value in to_process_input {
let value_span = value.tag.span;
match value_to_yaml_value(&value) {
Ok(yaml_value) => {
match serde_yaml::to_string(&yaml_value) {
Ok(x) => yield ReturnSuccess::value(
UntaggedValue::Primitive(Primitive::String(x)).into_value(&name_tag),
),
_ => yield Err(ShellError::labeled_error_with_secondary(
"Expected a table with YAML-compatible structure.tag() from pipeline",
"requires YAML-compatible input",
name_span,
"originates from here".to_string(),
value_span,
)),
}
}
_ => yield Err(ShellError::labeled_error(
"Expected a table with YAML-compatible structure from pipeline",
2019-08-06 05:03:13 +02:00
"requires YAML-compatible input",
&name_tag))
}
}
};
Ok(stream.to_output_stream())
2019-07-16 06:05:38 +02:00
}