forked from extern/nushell
This fixes the error case if we ^C during running an external command. This needs testing across platforms before it lands.
378 lines
13 KiB
Rust
378 lines
13 KiB
Rust
use crate::commands::Command;
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use crate::parser::{hir, TokenNode};
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use crate::prelude::*;
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use bytes::{BufMut, BytesMut};
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use futures::stream::StreamExt;
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use futures_codec::{Decoder, Encoder, Framed};
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use log::{log_enabled, trace};
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use std::io::{Error, ErrorKind};
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use std::sync::Arc;
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use subprocess::Exec;
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/// A simple `Codec` implementation that splits up data into lines.
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pub struct LinesCodec {}
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impl Encoder for LinesCodec {
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type Item = String;
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type Error = Error;
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fn encode(&mut self, item: Self::Item, dst: &mut BytesMut) -> Result<(), Self::Error> {
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dst.put(item);
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Ok(())
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}
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}
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impl Decoder for LinesCodec {
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type Item = String;
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type Error = Error;
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fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
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match src.iter().position(|b| b == &b'\n') {
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Some(pos) if !src.is_empty() => {
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let buf = src.split_to(pos + 1);
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String::from_utf8(buf.to_vec())
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.map(Some)
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.map_err(|e| Error::new(ErrorKind::InvalidData, e))
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}
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_ if !src.is_empty() => {
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let drained = src.take();
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String::from_utf8(drained.to_vec())
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.map(Some)
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.map_err(|e| Error::new(ErrorKind::InvalidData, e))
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}
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_ => Ok(None),
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}
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}
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}
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pub(crate) struct ClassifiedInputStream {
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pub(crate) objects: InputStream,
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pub(crate) stdin: Option<std::fs::File>,
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}
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impl ClassifiedInputStream {
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pub(crate) fn new() -> ClassifiedInputStream {
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ClassifiedInputStream {
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objects: VecDeque::new().into(),
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stdin: None,
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}
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}
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pub(crate) fn from_input_stream(stream: impl Into<InputStream>) -> ClassifiedInputStream {
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ClassifiedInputStream {
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objects: stream.into(),
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stdin: None,
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}
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}
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pub(crate) fn from_stdout(stdout: std::fs::File) -> ClassifiedInputStream {
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ClassifiedInputStream {
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objects: VecDeque::new().into(),
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stdin: Some(stdout),
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}
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}
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}
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pub(crate) struct ClassifiedPipeline {
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pub(crate) commands: Vec<ClassifiedCommand>,
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}
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pub(crate) enum ClassifiedCommand {
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#[allow(unused)]
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Expr(TokenNode),
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Internal(InternalCommand),
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External(ExternalCommand),
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}
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pub(crate) struct InternalCommand {
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pub(crate) command: Arc<Command>,
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pub(crate) name_span: Span,
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pub(crate) args: hir::Call,
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}
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impl InternalCommand {
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pub(crate) async fn run(
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self,
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context: &mut Context,
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input: ClassifiedInputStream,
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source: Text,
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) -> Result<InputStream, ShellError> {
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if log_enabled!(log::Level::Trace) {
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trace!(target: "nu::run::internal", "->");
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trace!(target: "nu::run::internal", "{}", self.command.name());
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trace!(target: "nu::run::internal", "{}", self.args.debug(&source));
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}
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let objects: InputStream =
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trace_stream!(target: "nu::trace_stream::internal", "input" = input.objects);
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let result = context.run_command(
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self.command,
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self.name_span.clone(),
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context.source_map.clone(),
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self.args,
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&source,
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objects,
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);
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let result = trace_out_stream!(target: "nu::trace_stream::internal", source: &source, "output" = result);
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let mut result = result.values;
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let mut stream = VecDeque::new();
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while let Some(item) = result.next().await {
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match item? {
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ReturnSuccess::Action(action) => match action {
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CommandAction::ChangePath(path) => {
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context.shell_manager.set_path(path);
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}
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CommandAction::AddSpanSource(uuid, span_source) => {
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context.add_span_source(uuid, span_source);
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}
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CommandAction::Exit => std::process::exit(0),
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CommandAction::EnterHelpShell(value) => {
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match value {
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Tagged {
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item: Value::Primitive(Primitive::String(cmd)),
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..
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} => {
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context.shell_manager.insert_at_current(Box::new(
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HelpShell::for_command(
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Tagged::from_simple_spanned_item(
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Value::string(cmd),
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Span::unknown(),
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),
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&context.registry().clone(),
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)?,
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));
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}
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_ => {
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context.shell_manager.insert_at_current(Box::new(
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HelpShell::index(&context.registry().clone())?,
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));
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}
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}
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}
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CommandAction::EnterValueShell(value) => {
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context
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.shell_manager
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.insert_at_current(Box::new(ValueShell::new(value)));
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}
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CommandAction::EnterShell(location) => {
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context.shell_manager.insert_at_current(Box::new(
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FilesystemShell::with_location(location, context.registry().clone())?,
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));
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}
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CommandAction::PreviousShell => {
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context.shell_manager.prev();
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}
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CommandAction::NextShell => {
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context.shell_manager.next();
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}
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CommandAction::LeaveShell => {
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context.shell_manager.remove_at_current();
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if context.shell_manager.is_empty() {
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std::process::exit(0);
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}
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}
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},
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ReturnSuccess::Value(v) => {
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stream.push_back(v);
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}
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}
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}
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Ok(stream.into())
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}
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}
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pub(crate) struct ExternalCommand {
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pub(crate) name: String,
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pub(crate) name_span: Span,
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pub(crate) args: Vec<Tagged<String>>,
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}
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pub(crate) enum StreamNext {
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Last,
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External,
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Internal,
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}
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impl ExternalCommand {
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pub(crate) async fn run(
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self,
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context: &mut Context,
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input: ClassifiedInputStream,
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stream_next: StreamNext,
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) -> Result<ClassifiedInputStream, ShellError> {
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let stdin = input.stdin;
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let inputs: Vec<Tagged<Value>> = input.objects.into_vec().await;
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let name_span = self.name_span.clone();
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trace!(target: "nu::run::external", "-> {}", self.name);
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trace!(target: "nu::run::external", "inputs = {:?}", inputs);
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let mut arg_string = format!("{}", self.name);
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for arg in &self.args {
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arg_string.push_str(&arg);
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}
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let mut process;
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#[cfg(windows)]
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{
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process = Exec::shell(&self.name);
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if arg_string.contains("$it") {
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let mut first = true;
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for i in &inputs {
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if i.as_string().is_err() {
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let mut span = None;
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for arg in &self.args {
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if arg.item.contains("$it") {
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span = Some(arg.span());
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}
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}
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if let Some(span) = span {
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return Err(ShellError::labeled_error(
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"External $it needs string data",
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"given row instead of string data",
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span,
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));
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} else {
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return Err(ShellError::string("Error: $it needs string data"));
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}
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}
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if !first {
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process = process.arg("&&");
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process = process.arg(&self.name);
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} else {
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first = false;
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}
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for arg in &self.args {
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if arg.chars().all(|c| c.is_whitespace()) {
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continue;
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}
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process = process.arg(&arg.replace("$it", &i.as_string()?));
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}
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}
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} else {
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for arg in &self.args {
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let arg_chars: Vec<_> = arg.chars().collect();
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if arg_chars.len() > 1
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&& arg_chars[0] == '"'
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&& arg_chars[arg_chars.len() - 1] == '"'
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{
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// quoted string
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let new_arg: String = arg_chars[1..arg_chars.len() - 1].iter().collect();
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process = process.arg(new_arg);
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} else {
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process = process.arg(arg.item.clone());
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}
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}
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}
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}
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#[cfg(not(windows))]
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{
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let mut new_arg_string = self.name.to_string();
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if arg_string.contains("$it") {
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let mut first = true;
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for i in &inputs {
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let i = match i.as_string() {
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Err(_err) => {
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let mut span = name_span;
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for arg in &self.args {
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if arg.item.contains("$it") {
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span = arg.span();
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}
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}
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return Err(ShellError::labeled_error(
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"External $it needs string data",
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"given row instead of string data",
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span,
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));
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}
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Ok(val) => val,
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};
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if !first {
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new_arg_string.push_str("&&");
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new_arg_string.push_str(&self.name);
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} else {
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first = false;
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}
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for arg in &self.args {
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if arg.chars().all(|c| c.is_whitespace()) {
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continue;
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}
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new_arg_string.push_str(" ");
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new_arg_string.push_str(&arg.replace("$it", &i));
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}
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}
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} else {
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for arg in &self.args {
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new_arg_string.push_str(" ");
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new_arg_string.push_str(&arg);
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}
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}
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process = Exec::shell(new_arg_string);
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}
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process = process.cwd(context.shell_manager.path());
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let mut process = match stream_next {
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StreamNext::Last => process,
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StreamNext::External | StreamNext::Internal => {
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process.stdout(subprocess::Redirection::Pipe)
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}
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};
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if let Some(stdin) = stdin {
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process = process.stdin(stdin);
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}
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let mut popen = process.popen()?;
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match stream_next {
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StreamNext::Last => {
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let _ = popen.detach();
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loop {
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match popen.poll() {
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None => {
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let _ = std::thread::sleep(std::time::Duration::new(0, 100000000));
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}
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_ => {
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let _ = popen.terminate();
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break;
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}
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}
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}
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println!("");
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Ok(ClassifiedInputStream::new())
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}
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StreamNext::External => {
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let stdout = popen.stdout.take().unwrap();
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Ok(ClassifiedInputStream::from_stdout(stdout))
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}
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StreamNext::Internal => {
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let stdout = popen.stdout.take().unwrap();
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let file = futures::io::AllowStdIo::new(stdout);
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let stream = Framed::new(file, LinesCodec {});
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let stream = stream.map(move |line| {
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Tagged::from_simple_spanned_item(Value::string(line.unwrap()), name_span)
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});
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Ok(ClassifiedInputStream::from_input_stream(
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stream.boxed() as BoxStream<'static, Tagged<Value>>
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))
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}
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}
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}
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}
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