nushell/crates/nu-command/src/commands/build_string.rs
Michael Angerman d06f457b2a
nu-cli refactor moving commands into their own crate nu-command (#2910)
* move commands, futures.rs, script.rs, utils

* move over maybe_print_errors

* add nu_command crate references to nu_cli

* in commands.rs open up to pub mod from pub(crate)

* nu-cli, nu-command, and nu tests are now passing

* cargo fmt

* clean up nu-cli/src/prelude.rs

* code cleanup

* for some reason lex.rs was not formatted, may be causing my error

* remove mod completion from lib.rs which was not being used along with quickcheck macros

* add in allow unused imports

* comment out one failing external test; comment out one failing internal test

* revert commenting out failing tests; something else might be going on; someone with a windows machine should check and see what is going on with these failing windows tests

* Update Cargo.toml

Extend the optional features to nu-command

Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>
2021-01-12 17:59:53 +13:00

52 lines
1.4 KiB
Rust

use crate::prelude::*;
use nu_errors::ShellError;
use nu_data::value::format_leaf;
use nu_engine::WholeStreamCommand;
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
#[derive(Deserialize)]
pub struct BuildStringArgs {
rest: Vec<Value>,
}
pub struct BuildString;
#[async_trait]
impl WholeStreamCommand for BuildString {
fn name(&self) -> &str {
"build-string"
}
fn signature(&self) -> Signature {
Signature::build("build-string")
.rest(SyntaxShape::Any, "all values to form into the string")
}
fn usage(&self) -> &str {
"Builds a string from the arguments"
}
async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
let tag = args.call_info.name_tag.clone();
let (BuildStringArgs { rest }, _) = args.process().await?;
let mut output_string = String::new();
for r in rest {
output_string.push_str(&format_leaf(&r).plain_string(100_000))
}
Ok(OutputStream::one(ReturnSuccess::value(
UntaggedValue::string(output_string).into_value(tag),
)))
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Builds a string from a string and a number, without spaces between them",
example: "build-string 'foo' 3",
result: None,
}]
}
}