forked from extern/nushell
275 lines
9.9 KiB
Rust
275 lines
9.9 KiB
Rust
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use crate::commands::classified::block::run_block;
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use crate::commands::classified::maybe_text_codec::{MaybeTextCodec, StringOrBinary};
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use crate::evaluation_context::EvaluationContext;
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use crate::path::canonicalize;
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use crate::prelude::*;
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use futures_codec::FramedRead;
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use nu_errors::ShellError;
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use nu_protocol::hir::{ClassifiedCommand, Expression, InternalCommand, Literal, NamedArguments};
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use nu_protocol::{Primitive, ReturnSuccess, UntaggedValue, Value};
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use log::{debug, trace};
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use std::error::Error;
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use std::iter::Iterator;
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use std::path::Path;
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#[derive(Debug)]
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pub enum LineResult {
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Success(String),
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Error(String, ShellError),
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Break,
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CtrlC,
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CtrlD,
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ClearHistory,
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}
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fn chomp_newline(s: &str) -> &str {
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if let Some(s) = s.strip_suffix('\n') {
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s
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} else {
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s
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}
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}
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pub fn print_err(err: ShellError, source: &Text) {
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if let Some(diag) = err.into_diagnostic() {
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let source = source.to_string();
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let mut files = codespan_reporting::files::SimpleFiles::new();
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files.add("shell", source);
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let writer = codespan_reporting::term::termcolor::StandardStream::stderr(
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codespan_reporting::term::termcolor::ColorChoice::Always,
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);
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let config = codespan_reporting::term::Config::default();
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let _ = std::panic::catch_unwind(move || {
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let _ = codespan_reporting::term::emit(&mut writer.lock(), &config, &files, &diag);
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});
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}
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}
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/// Process the line by parsing the text to turn it into commands, classify those commands so that we understand what is being called in the pipeline, and then run this pipeline
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pub async fn process_script(
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script_text: &str,
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ctx: &EvaluationContext,
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redirect_stdin: bool,
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span_offset: usize,
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cli_mode: bool,
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) -> LineResult {
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if script_text.trim() == "" {
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LineResult::Success(script_text.to_string())
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} else {
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let line = chomp_newline(script_text);
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let (block, err) = nu_parser::parse(&line, span_offset, &ctx.scope);
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debug!("{:#?}", block);
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//println!("{:#?}", pipeline);
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if let Some(failure) = err {
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return LineResult::Error(line.to_string(), failure.into());
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}
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// There's a special case to check before we process the pipeline:
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// If we're giving a path by itself
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// ...and it's not a command in the path
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// ...and it doesn't have any arguments
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// ...and we're in the CLI
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// ...then change to this directory
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if cli_mode
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&& block.block.len() == 1
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&& block.block[0].pipelines.len() == 1
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&& block.block[0].pipelines[0].list.len() == 1
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{
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if let ClassifiedCommand::Internal(InternalCommand {
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ref name, ref args, ..
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}) = block.block[0].pipelines[0].list[0]
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{
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let internal_name = name;
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let name = args
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.positional
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.as_ref()
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.and_then(|potionals| {
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potionals.get(0).map(|e| {
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if let Expression::Literal(Literal::String(ref s)) = e.expr {
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&s
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} else {
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""
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}
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})
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})
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.unwrap_or("");
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if internal_name == "run_external"
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&& args
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.positional
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.as_ref()
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.map(|ref v| v.len() == 1)
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.unwrap_or(true)
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&& args
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.named
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.as_ref()
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.map(NamedArguments::is_empty)
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.unwrap_or(true)
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&& canonicalize(ctx.shell_manager.path(), name).is_ok()
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&& Path::new(&name).is_dir()
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&& !crate::commands::classified::external::did_find_command(&name)
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{
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// Here we work differently if we're in Windows because of the expected Windows behavior
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#[cfg(windows)]
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{
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if name.ends_with(':') {
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// This looks like a drive shortcut. We need to a) switch drives and b) go back to the previous directory we were viewing on that drive
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// But first, we need to save where we are now
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let current_path = ctx.shell_manager.path();
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let split_path: Vec<_> = current_path.split(':').collect();
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if split_path.len() > 1 {
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ctx.windows_drives_previous_cwd
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.lock()
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.insert(split_path[0].to_string(), current_path);
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}
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let name = name.to_uppercase();
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let new_drive: Vec<_> = name.split(':').collect();
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if let Some(val) =
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ctx.windows_drives_previous_cwd.lock().get(new_drive[0])
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{
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ctx.shell_manager.set_path(val.to_string());
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return LineResult::Success(line.to_string());
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} else {
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ctx.shell_manager
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.set_path(format!("{}\\", name.to_string()));
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return LineResult::Success(line.to_string());
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}
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} else {
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ctx.shell_manager.set_path(name.to_string());
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return LineResult::Success(line.to_string());
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}
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}
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#[cfg(not(windows))]
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{
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ctx.shell_manager.set_path(name.to_string());
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return LineResult::Success(line.to_string());
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}
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}
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}
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}
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let input_stream = if redirect_stdin {
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let file = futures::io::AllowStdIo::new(std::io::stdin());
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let stream = FramedRead::new(file, MaybeTextCodec::default()).map(|line| {
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if let Ok(line) = line {
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let primitive = match line {
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StringOrBinary::String(s) => Primitive::String(s),
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StringOrBinary::Binary(b) => Primitive::Binary(b.into_iter().collect()),
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};
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Ok(Value {
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value: UntaggedValue::Primitive(primitive),
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tag: Tag::unknown(),
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})
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} else {
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panic!("Internal error: could not read lines of text from stdin")
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}
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});
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stream.to_input_stream()
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} else {
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InputStream::empty()
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};
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trace!("{:#?}", block);
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let env = ctx.get_env();
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ctx.scope.add_env(env);
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let result = run_block(&block, ctx, input_stream).await;
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match result {
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Ok(input) => {
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// Running a pipeline gives us back a stream that we can then
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// work through. At the top level, we just want to pull on the
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// values to compute them.
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use futures::stream::TryStreamExt;
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let context = RunnableContext {
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input,
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shell_manager: ctx.shell_manager.clone(),
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host: ctx.host.clone(),
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ctrl_c: ctx.ctrl_c.clone(),
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current_errors: ctx.current_errors.clone(),
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scope: ctx.scope.clone(),
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name: Tag::unknown(),
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};
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if let Ok(mut output_stream) =
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crate::commands::autoview::command::autoview(context).await
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{
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loop {
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match output_stream.try_next().await {
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Ok(Some(ReturnSuccess::Value(Value {
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value: UntaggedValue::Error(e),
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..
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}))) => return LineResult::Error(line.to_string(), e),
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Ok(Some(_item)) => {
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if ctx.ctrl_c.load(Ordering::SeqCst) {
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break;
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}
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}
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Ok(None) => break,
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Err(e) => return LineResult::Error(line.to_string(), e),
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}
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}
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}
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LineResult::Success(line.to_string())
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}
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Err(err) => LineResult::Error(line.to_string(), err),
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}
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}
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}
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pub async fn run_script_standalone(
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script_text: String,
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redirect_stdin: bool,
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context: &EvaluationContext,
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exit_on_error: bool,
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) -> Result<(), Box<dyn Error>> {
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let line = process_script(&script_text, context, redirect_stdin, 0, false).await;
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match line {
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LineResult::Success(line) => {
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let error_code = {
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let errors = context.current_errors.clone();
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let errors = errors.lock();
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if errors.len() > 0 {
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1
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} else {
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0
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}
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};
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context.maybe_print_errors(Text::from(line));
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if error_code != 0 && exit_on_error {
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std::process::exit(error_code);
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}
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}
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LineResult::Error(line, err) => {
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context.with_host(|_host| {
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print_err(err, &Text::from(line.clone()));
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});
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context.maybe_print_errors(Text::from(line));
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if exit_on_error {
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std::process::exit(1);
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}
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}
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_ => {}
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}
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Ok(())
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}
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