forked from extern/nushell
312 lines
11 KiB
Rust
312 lines
11 KiB
Rust
use crate::{evaluate::internal::InternalIterator, maybe_print_errors, run_block, shell::CdArgs};
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use crate::{BufCodecReader, MaybeTextCodec, StringOrBinary};
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use nu_errors::ShellError;
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use nu_path::canonicalize;
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use nu_protocol::hir::{
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Call, ClassifiedCommand, Expression, ExternalRedirection, InternalCommand, Literal,
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NamedArguments, SpannedExpression,
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};
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use nu_protocol::{Primitive, UntaggedValue, Value};
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use nu_stream::{InputStream, IntoInputStream};
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use crate::EvaluationContext;
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use log::{debug, trace};
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use nu_source::{AnchorLocation, Span, Tag, Tagged, Text};
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use std::path::{Path, PathBuf};
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use std::{error::Error, sync::atomic::Ordering};
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use std::{io::BufReader, iter::Iterator};
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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 run_script_in_dir(
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script: String,
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dir: &Path,
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ctx: &EvaluationContext,
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) -> Result<(), Box<dyn Error>> {
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//Save path before to switch back to it after executing script
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let path_before = ctx.shell_manager().path();
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ctx.shell_manager()
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.set_path(dir.to_string_lossy().to_string());
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run_script_standalone(script, false, ctx, false)?;
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ctx.shell_manager().set_path(path_before);
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Ok(())
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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 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,
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ref args,
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name_span,
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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(|positionals| {
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positionals.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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ctx.sync_path_to_env();
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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(|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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&& !ctx.host().lock().is_external_cmd(name)
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{
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let tag = Tag {
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anchor: Some(AnchorLocation::Source(line.into())),
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span: name_span,
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};
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let path = {
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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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val.to_string()
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} else {
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format!("{}\\", name.to_string())
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}
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} else {
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name.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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name.to_string()
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}
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};
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let cd_args = CdArgs {
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path: Some(Tagged {
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item: PathBuf::from(path),
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tag: tag.clone(),
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}),
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};
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return match ctx.shell_manager().cd(cd_args, tag) {
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Err(e) => LineResult::Error(line.to_string(), e),
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Ok(stream) => {
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let iter = InternalIterator {
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context: ctx.clone(),
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leftovers: InputStream::empty(),
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input: stream,
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};
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for _ in iter {
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//nullopt, commands are run by iterating over iter
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}
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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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}
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let input_stream = if redirect_stdin {
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let file = std::io::stdin();
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let buf_reader = BufReader::new(file);
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let buf_codec = BufCodecReader::new(buf_reader, MaybeTextCodec::default());
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let stream = buf_codec.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.into_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 result = run_block(&block, ctx, input_stream, ExternalRedirection::None);
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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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let autoview_cmd = ctx
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.get_command("autoview")
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.expect("Could not find autoview command");
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if let Ok(mut output_stream) = ctx.run_command(
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autoview_cmd,
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Tag::unknown(),
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Call::new(
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Box::new(SpannedExpression::new(
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Expression::string("autoview".to_string()),
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Span::unknown(),
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)),
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Span::unknown(),
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),
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input,
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) {
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loop {
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match output_stream.next() {
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Some(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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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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None => break,
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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 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<(), ShellError> {
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context
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.shell_manager()
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.enter_script_mode()
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.map_err(ShellError::from)?;
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let line = process_script(&script_text, context, redirect_stdin, 0, false);
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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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maybe_print_errors(context, 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
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.host()
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.lock()
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.print_err(err, &Text::from(line.clone()));
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maybe_print_errors(context, 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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//exit script mode shell
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context.shell_manager().remove_at_current();
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Ok(())
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}
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