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use crate::prelude::*;
use nu_engine::UnevaluatedCallInfo;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::hir::ExternalRedirection;
use nu_protocol::{
CommandAction, Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value,
};
use nu_source::Tagged;
use std::path::PathBuf;
pub struct Enter;
impl WholeStreamCommand for Enter {
fn name(&self) -> &str {
"enter"
}
fn signature(&self) -> Signature {
Signature::build("enter")
.required(
"location",
SyntaxShape::FilePath,
"the location to create a new shell from",
)
.named(
"encoding",
SyntaxShape::String,
"encoding to use to open file",
Some('e'),
)
}
fn usage(&self) -> &str {
"Create a new shell and begin at this path."
}
fn extra_usage(&self) -> &str {
r#"Multiple encodings are supported for reading text files by using
the '--encoding <encoding>' parameter. Here is an example of a few:
big5, euc-jp, euc-kr, gbk, iso-8859-1, utf-16, cp1252, latin5
For a more complete list of encodings please refer to the encoding_rs
documentation link at https://docs.rs/encoding_rs/0.8.28/encoding_rs/#statics"#
}
fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
enter(args)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Enter a path as a new shell",
example: "enter ../projectB",
result: None,
},
Example {
description: "Enter a file as a new shell",
example: "enter package.json",
result: None,
},
Example {
description: "Enters file with iso-8859-1 encoding",
example: "enter file.csv --encoding iso-8859-1",
result: None,
},
]
}
}
fn enter(args: CommandArgs) -> Result<ActionStream, ShellError> {
let head = args.call_info.args.head.clone();
let context = args.context.clone();
let scope = args.scope().clone();
let path = args.context.shell_manager().path();
let location: Tagged<PathBuf> = args.req(0)?;
let encoding: Option<Tagged<String>> = args.get_flag("encoding")?;
let location_string = location.display().to_string();
if location.is_dir() {
Ok(ActionStream::one(ReturnSuccess::action(
CommandAction::EnterShell(location_string),
)))
} else {
let cwd = path;
let full_path = std::path::PathBuf::from(cwd);
let span = location.span();
let (file_extension, tagged_contents) = crate::commands::filesystem::open::fetch(
&full_path,
&PathBuf::from(location_string),
span,
encoding,
)?;
match tagged_contents.value {
UntaggedValue::Primitive(Primitive::String(_)) => {
if let Some(extension) = file_extension {
let command_name = format!("from {}", extension);
if let Some(converter) = scope.get_command(&command_name) {
let tag = tagged_contents.tag.clone();
let new_args = CommandArgs {
context,
call_info: UnevaluatedCallInfo {
args: nu_protocol::hir::Call {
head,
positional: None,
named: None,
span: Span::unknown(),
external_redirection: ExternalRedirection::Stdout,
},
name_tag: tag.clone(),
},
input: InputStream::one(tagged_contents),
};
let mut result = converter.run(new_args)?;
let result_vec: Vec<Value> = result.drain_vec();
Ok(result_vec
.into_iter()
.map(move |res| {
let Value { value, .. } = res;
Ok(ReturnSuccess::Action(CommandAction::EnterValueShell(
Value {
value,
tag: tag.clone(),
},
)))
})
.into_action_stream())
} else {
Ok(ActionStream::one(ReturnSuccess::action(
CommandAction::EnterValueShell(tagged_contents),
)))
}
} else {
Ok(ActionStream::one(ReturnSuccess::action(
CommandAction::EnterValueShell(tagged_contents),
)))
}
}
_ => Ok(ActionStream::one(ReturnSuccess::action(
CommandAction::EnterValueShell(tagged_contents),
))),
}
}
}
#[cfg(test)]
mod tests {
use super::Enter;
use super::ShellError;
#[test]
fn examples_work_as_expected() -> Result<(), ShellError> {
use crate::examples::test as test_examples;
test_examples(Enter {})
}
}