nushell/crates/nu-command/src/commands/from_vcf.rs

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extern crate ical;
use crate::prelude::*;
use ical::parser::vcard::component::*;
use ical::property::Property;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::{Primitive, ReturnSuccess, Signature, TaggedDictBuilder, UntaggedValue, Value};
pub struct FromVcf;
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#[async_trait]
impl WholeStreamCommand for FromVcf {
fn name(&self) -> &str {
"from vcf"
}
fn signature(&self) -> Signature {
Signature::build("from vcf")
}
fn usage(&self) -> &str {
"Parse text as .vcf and create table."
}
async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
from_vcf(args).await
}
}
async fn from_vcf(args: CommandArgs) -> Result<OutputStream, ShellError> {
let args = args.evaluate_once().await?;
let tag = args.name_tag();
let input = args.input;
let input_string = input.collect_string(tag.clone()).await?.item;
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let input_bytes = input_string.into_bytes();
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let cursor = std::io::Cursor::new(input_bytes);
let parser = ical::VcardParser::new(cursor);
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let iter = parser.map(move |contact| match contact {
Ok(c) => ReturnSuccess::value(contact_to_value(c, tag.clone())),
Err(_) => Err(ShellError::labeled_error(
"Could not parse as .vcf",
"input cannot be parsed as .vcf",
tag.clone(),
)),
});
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Ok(futures::stream::iter(iter).to_output_stream())
}
fn contact_to_value(contact: VcardContact, tag: Tag) -> Value {
let mut row = TaggedDictBuilder::new(tag.clone());
row.insert_untagged("properties", properties_to_value(contact.properties, tag));
row.into_value()
}
fn properties_to_value(properties: Vec<Property>, tag: Tag) -> UntaggedValue {
UntaggedValue::table(
&properties
.into_iter()
.map(|prop| {
let mut row = TaggedDictBuilder::new(tag.clone());
let name = UntaggedValue::string(prop.name);
let value = match prop.value {
Some(val) => UntaggedValue::string(val),
None => UntaggedValue::Primitive(Primitive::Nothing),
};
let params = match prop.params {
Some(param_list) => params_to_value(param_list, tag.clone()).into(),
None => UntaggedValue::Primitive(Primitive::Nothing),
};
row.insert_untagged("name", name);
row.insert_untagged("value", value);
row.insert_untagged("params", params);
row.into_value()
})
.collect::<Vec<Value>>(),
)
}
fn params_to_value(params: Vec<(String, Vec<String>)>, tag: Tag) -> Value {
let mut row = TaggedDictBuilder::new(tag);
for (param_name, param_values) in params {
let values: Vec<Value> = param_values.into_iter().map(|val| val.into()).collect();
let values = UntaggedValue::table(&values);
row.insert_untagged(param_name, values);
}
row.into_value()
}
#[cfg(test)]
mod tests {
use super::FromVcf;
use super::ShellError;
#[test]
fn examples_work_as_expected() -> Result<(), ShellError> {
use crate::examples::test as test_examples;
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test_examples(FromVcf {})
}
}