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repl.rs
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repl.rs
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use crate::{
completions::NuCompleter,
prompt_update,
reedline_config::{add_menus, create_keybindings, KeybindingsMode},
util::eval_source,
NuHighlighter, NuValidator, NushellPrompt,
};
use crossterm::cursor::SetCursorStyle;
use log::{trace, warn};
use miette::{IntoDiagnostic, Result};
use nu_color_config::StyleComputer;
use nu_command::hook::eval_hook;
use nu_command::util::get_guaranteed_cwd;
use nu_engine::convert_env_values;
use nu_parser::{lex, trim_quotes_str};
use nu_protocol::{
config::NuCursorShape,
engine::{EngineState, Stack, StateWorkingSet},
report_error, report_error_new, HistoryFileFormat, PipelineData, ShellError, Span, Spanned,
Value,
};
use nu_utils::utils::perf;
use reedline::{CursorConfig, DefaultHinter, EditCommand, Emacs, SqliteBackedHistory, Vi};
use std::{
io::{self, Write},
sync::atomic::Ordering,
time::Instant,
};
use sysinfo::SystemExt;
// According to Daniel Imms @Tyriar, we need to do these this way:
// <133 A><prompt><133 B><command><133 C><command output>
// These first two have been moved to prompt_update to get as close as possible to the prompt.
// const PRE_PROMPT_MARKER: &str = "\x1b]133;A\x1b\\";
// const POST_PROMPT_MARKER: &str = "\x1b]133;B\x1b\\";
const PRE_EXECUTE_MARKER: &str = "\x1b]133;C\x1b\\";
// This one is in get_command_finished_marker() now so we can capture the exit codes properly.
// const CMD_FINISHED_MARKER: &str = "\x1b]133;D;{}\x1b\\";
const RESET_APPLICATION_MODE: &str = "\x1b[?1l";
pub fn evaluate_repl(
engine_state: &mut EngineState,
stack: &mut Stack,
nushell_path: &str,
prerun_command: Option<Spanned<String>>,
load_std_lib: Option<Spanned<String>>,
entire_start_time: Instant,
) -> Result<()> {
use nu_command::hook;
use reedline::{FileBackedHistory, Reedline, Signal};
let use_color = engine_state.get_config().use_ansi_coloring;
// Guard against invocation without a connected terminal.
// reedline / crossterm event polling will fail without a connected tty
if !atty::is(atty::Stream::Stdin) {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
"Nushell launched as a REPL, but STDIN is not a TTY; either launch in a valid terminal or provide arguments to invoke a script!",
))
.into_diagnostic();
}
let mut entry_num = 0;
let mut nu_prompt = NushellPrompt::new();
let start_time = std::time::Instant::now();
// Translate environment variables from Strings to Values
if let Some(e) = convert_env_values(engine_state, stack) {
let working_set = StateWorkingSet::new(engine_state);
report_error(&working_set, &e);
}
perf(
"translate env vars",
start_time,
file!(),
line!(),
column!(),
use_color,
);
// seed env vars
stack.add_env_var(
"CMD_DURATION_MS".into(),
Value::string("0823", Span::unknown()),
);
stack.add_env_var("LAST_EXIT_CODE".into(), Value::int(0, Span::unknown()));
let mut start_time = std::time::Instant::now();
let mut line_editor = Reedline::create();
// Now that reedline is created, get the history session id and store it in engine_state
let hist_sesh = line_editor
.get_history_session_id()
.map(i64::from)
.unwrap_or(0);
engine_state.history_session_id = hist_sesh;
perf(
"setup reedline",
start_time,
file!(),
line!(),
column!(),
use_color,
);
let config = engine_state.get_config();
if config.bracketed_paste {
// try to enable bracketed paste
// It doesn't work on windows system: https://github.com/crossterm-rs/crossterm/issues/737
#[cfg(not(target_os = "windows"))]
let _ = line_editor.enable_bracketed_paste();
}
// Setup history_isolation aka "history per session"
let history_isolation = config.history_isolation;
let history_session_id = if history_isolation {
Reedline::create_history_session_id()
} else {
None
};
start_time = std::time::Instant::now();
let history_path = crate::config_files::get_history_path(
nushell_path,
engine_state.config.history_file_format,
);
if let Some(history_path) = history_path.as_deref() {
let history: Box<dyn reedline::History> = match engine_state.config.history_file_format {
HistoryFileFormat::PlainText => Box::new(
FileBackedHistory::with_file(
config.max_history_size as usize,
history_path.to_path_buf(),
)
.into_diagnostic()?,
),
HistoryFileFormat::Sqlite => Box::new(
SqliteBackedHistory::with_file(history_path.to_path_buf()).into_diagnostic()?,
),
};
line_editor = line_editor
.with_history_session_id(history_session_id)
.with_history(history);
};
perf(
"setup history",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
let sys = sysinfo::System::new();
perf(
"get sysinfo",
start_time,
file!(),
line!(),
column!(),
use_color,
);
if let Some(s) = prerun_command {
eval_source(
engine_state,
stack,
s.item.as_bytes(),
&format!("entry #{entry_num}"),
PipelineData::empty(),
false,
);
engine_state.merge_env(stack)?;
engine_state.set_current_working_dir(get_guaranteed_cwd(engine_state, stack))?;
}
engine_state.set_startup_time(entire_start_time.elapsed().as_nanos() as i64);
if load_std_lib.is_none() && engine_state.get_config().show_banner {
eval_source(
engine_state,
stack,
r#"use std banner; banner"#.as_bytes(),
"show_banner",
PipelineData::empty(),
false,
);
}
loop {
let loop_start_time = std::time::Instant::now();
start_time = std::time::Instant::now();
// Before doing anything, merge the environment from the previous REPL iteration into the
// permanent state.
if let Err(err) = engine_state.merge_env(stack) {
report_error_new(engine_state, &err);
}
let cwd = get_guaranteed_cwd(engine_state, stack);
if let Err(err) = engine_state.set_current_working_dir(cwd) {
report_error_new(engine_state, &err);
}
perf(
"merge env",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
//Reset the ctrl-c handler
if let Some(ctrlc) = &mut engine_state.ctrlc {
ctrlc.store(false, Ordering::SeqCst);
}
perf(
"reset ctrlc",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
// Reset the SIGQUIT handler
if let Some(sig_quit) = engine_state.get_sig_quit() {
sig_quit.store(false, Ordering::SeqCst);
}
perf(
"reset sig_quit",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
let config = engine_state.get_config();
let engine_reference = std::sync::Arc::new(engine_state.clone());
// Find the configured cursor shapes for each mode
let cursor_config = CursorConfig {
vi_insert: Some(map_nucursorshape_to_cursorshape(
config.cursor_shape_vi_insert,
)),
vi_normal: Some(map_nucursorshape_to_cursorshape(
config.cursor_shape_vi_normal,
)),
emacs: Some(map_nucursorshape_to_cursorshape(config.cursor_shape_emacs)),
};
perf(
"get config/cursor config",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
line_editor = line_editor
.with_highlighter(Box::new(NuHighlighter {
engine_state: engine_reference.clone(),
config: config.clone(),
}))
.with_validator(Box::new(NuValidator {
engine_state: engine_reference.clone(),
}))
.with_completer(Box::new(NuCompleter::new(
engine_reference.clone(),
stack.clone(),
)))
.with_quick_completions(config.quick_completions)
.with_partial_completions(config.partial_completions)
.with_ansi_colors(config.use_ansi_coloring)
.with_cursor_config(cursor_config);
perf(
"reedline builder",
start_time,
file!(),
line!(),
column!(),
use_color,
);
let style_computer = StyleComputer::from_config(engine_state, stack);
start_time = std::time::Instant::now();
line_editor = if config.use_ansi_coloring {
line_editor.with_hinter(Box::new({
// As of Nov 2022, "hints" color_config closures only get `null` passed in.
let style = style_computer.compute("hints", &Value::nothing(Span::unknown()));
DefaultHinter::default().with_style(style)
}))
} else {
line_editor.disable_hints()
};
perf(
"reedline coloring/style_computer",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
line_editor = add_menus(line_editor, engine_reference, stack, config).unwrap_or_else(|e| {
let working_set = StateWorkingSet::new(engine_state);
report_error(&working_set, &e);
Reedline::create()
});
perf(
"reedline menus",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
let buffer_editor = if !config.buffer_editor.is_empty() {
Some(config.buffer_editor.clone())
} else {
stack
.get_env_var(engine_state, "EDITOR")
.map(|v| v.as_string().unwrap_or_default())
.filter(|v| !v.is_empty())
.or_else(|| {
stack
.get_env_var(engine_state, "VISUAL")
.map(|v| v.as_string().unwrap_or_default())
.filter(|v| !v.is_empty())
})
};
line_editor = if let Some(buffer_editor) = buffer_editor {
line_editor.with_buffer_editor(buffer_editor, "nu".into())
} else {
line_editor
};
perf(
"reedline buffer_editor",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
if config.sync_history_on_enter {
if let Err(e) = line_editor.sync_history() {
warn!("Failed to sync history: {}", e);
}
}
perf(
"sync_history",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
// Changing the line editor based on the found keybindings
line_editor = match create_keybindings(config) {
Ok(keybindings) => match keybindings {
KeybindingsMode::Emacs(keybindings) => {
let edit_mode = Box::new(Emacs::new(keybindings));
line_editor.with_edit_mode(edit_mode)
}
KeybindingsMode::Vi {
insert_keybindings,
normal_keybindings,
} => {
let edit_mode = Box::new(Vi::new(insert_keybindings, normal_keybindings));
line_editor.with_edit_mode(edit_mode)
}
},
Err(e) => {
let working_set = StateWorkingSet::new(engine_state);
report_error(&working_set, &e);
line_editor
}
};
perf(
"keybindings",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
// Right before we start our prompt and take input from the user,
// fire the "pre_prompt" hook
if let Some(hook) = config.hooks.pre_prompt.clone() {
if let Err(err) = eval_hook(engine_state, stack, None, vec![], &hook) {
report_error_new(engine_state, &err);
}
}
perf(
"pre-prompt hook",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
// Next, check all the environment variables they ask for
// fire the "env_change" hook
let config = engine_state.get_config();
if let Err(error) =
hook::eval_env_change_hook(config.hooks.env_change.clone(), engine_state, stack)
{
report_error_new(engine_state, &error)
}
perf(
"env-change hook",
start_time,
file!(),
line!(),
column!(),
use_color,
);
start_time = std::time::Instant::now();
let config = &engine_state.get_config().clone();
let prompt = prompt_update::update_prompt(config, engine_state, stack, &mut nu_prompt);
perf(
"update_prompt",
start_time,
file!(),
line!(),
column!(),
use_color,
);
entry_num += 1;
start_time = std::time::Instant::now();
let input = line_editor.read_line(prompt);
let shell_integration = config.shell_integration;
match input {
Ok(Signal::Success(s)) => {
let hostname = sys.host_name();
let history_supports_meta =
matches!(config.history_file_format, HistoryFileFormat::Sqlite);
if history_supports_meta && !s.is_empty() && line_editor.has_last_command_context()
{
line_editor
.update_last_command_context(&|mut c| {
c.start_timestamp = Some(chrono::Utc::now());
c.hostname = hostname.clone();
c.cwd = Some(StateWorkingSet::new(engine_state).get_cwd());
c
})
.into_diagnostic()?; // todo: don't stop repl if error here?
}
// Right before we start running the code the user gave us, fire the `pre_execution`
// hook
if let Some(hook) = config.hooks.pre_execution.clone() {
// Set the REPL buffer to the current command for the "pre_execution" hook
let mut repl_buffer = engine_state
.repl_buffer_state
.lock()
.expect("repl buffer state mutex");
*repl_buffer = s.to_string();
drop(repl_buffer);
if let Err(err) = eval_hook(engine_state, stack, None, vec![], &hook) {
report_error_new(engine_state, &err);
}
}
let mut repl_cursor = engine_state
.repl_cursor_pos
.lock()
.expect("repl cursor pos mutex");
*repl_cursor = line_editor.current_insertion_point();
drop(repl_cursor);
let mut repl_buffer = engine_state
.repl_buffer_state
.lock()
.expect("repl buffer state mutex");
*repl_buffer = line_editor.current_buffer_contents().to_string();
drop(repl_buffer);
if shell_integration {
run_ansi_sequence(PRE_EXECUTE_MARKER)?;
}
let start_time = Instant::now();
let tokens = lex(s.as_bytes(), 0, &[], &[], false);
// Check if this is a single call to a directory, if so auto-cd
let cwd = nu_engine::env::current_dir_str(engine_state, stack)?;
let mut orig = s.clone();
if orig.starts_with('`') {
orig = trim_quotes_str(&orig).to_string()
}
let path = nu_path::expand_path_with(&orig, &cwd);
if looks_like_path(&orig) && path.is_dir() && tokens.0.len() == 1 {
// We have an auto-cd
let (path, span) = {
if !path.exists() {
let working_set = StateWorkingSet::new(engine_state);
report_error(
&working_set,
&ShellError::DirectoryNotFound(tokens.0[0].span, None),
);
}
let path = nu_path::canonicalize_with(path, &cwd)
.expect("internal error: cannot canonicalize known path");
(path.to_string_lossy().to_string(), tokens.0[0].span)
};
stack.add_env_var(
"OLDPWD".into(),
Value::String {
val: cwd.clone(),
span: Span::unknown(),
},
);
//FIXME: this only changes the current scope, but instead this environment variable
//should probably be a block that loads the information from the state in the overlay
stack.add_env_var(
"PWD".into(),
Value::String {
val: path.clone(),
span: Span::unknown(),
},
);
let cwd = Value::String { val: cwd, span };
let shells = stack.get_env_var(engine_state, "NUSHELL_SHELLS");
let mut shells = if let Some(v) = shells {
v.as_list()
.map(|x| x.to_vec())
.unwrap_or_else(|_| vec![cwd])
} else {
vec![cwd]
};
let current_shell = stack.get_env_var(engine_state, "NUSHELL_CURRENT_SHELL");
let current_shell = if let Some(v) = current_shell {
v.as_integer().unwrap_or_default() as usize
} else {
0
};
let last_shell = stack.get_env_var(engine_state, "NUSHELL_LAST_SHELL");
let last_shell = if let Some(v) = last_shell {
v.as_integer().unwrap_or_default() as usize
} else {
0
};
shells[current_shell] = Value::String { val: path, span };
stack.add_env_var("NUSHELL_SHELLS".into(), Value::List { vals: shells, span });
stack.add_env_var(
"NUSHELL_LAST_SHELL".into(),
Value::Int {
val: last_shell as i64,
span,
},
);
} else if !s.trim().is_empty() {
trace!("eval source: {}", s);
eval_source(
engine_state,
stack,
s.as_bytes(),
&format!("entry #{entry_num}"),
PipelineData::empty(),
false,
);
}
let cmd_duration = start_time.elapsed();
stack.add_env_var(
"CMD_DURATION_MS".into(),
Value::String {
val: format!("{}", cmd_duration.as_millis()),
span: Span::unknown(),
},
);
if history_supports_meta && !s.is_empty() && line_editor.has_last_command_context()
{
line_editor
.update_last_command_context(&|mut c| {
c.duration = Some(cmd_duration);
c.exit_status = stack
.get_env_var(engine_state, "LAST_EXIT_CODE")
.and_then(|e| e.as_i64().ok());
c
})
.into_diagnostic()?; // todo: don't stop repl if error here?
}
if shell_integration {
run_ansi_sequence(&get_command_finished_marker(stack, engine_state))?;
if let Some(cwd) = stack.get_env_var(engine_state, "PWD") {
let path = cwd.as_string()?;
// Communicate the path as OSC 7 (often used for spawning new tabs in the same dir)
run_ansi_sequence(&format!(
"\x1b]7;file://{}{}{}\x1b\\",
percent_encoding::utf8_percent_encode(
&hostname.unwrap_or_else(|| "localhost".to_string()),
percent_encoding::CONTROLS
),
if path.starts_with('/') { "" } else { "/" },
percent_encoding::utf8_percent_encode(
&path,
percent_encoding::CONTROLS
)
))?;
// Try to abbreviate string for windows title
let maybe_abbrev_path = if let Some(p) = nu_path::home_dir() {
path.replace(&p.as_path().display().to_string(), "~")
} else {
path
};
// Set window title too
// https://tldp.org/HOWTO/Xterm-Title-3.html
// ESC]0;stringBEL -- Set icon name and window title to string
// ESC]1;stringBEL -- Set icon name to string
// ESC]2;stringBEL -- Set window title to string
run_ansi_sequence(&format!("\x1b]2;{maybe_abbrev_path}\x07"))?;
}
run_ansi_sequence(RESET_APPLICATION_MODE)?;
}
let mut repl_buffer = engine_state
.repl_buffer_state
.lock()
.expect("repl buffer state mutex");
let mut repl_cursor_pos = engine_state
.repl_cursor_pos
.lock()
.expect("repl cursor pos mutex");
line_editor.run_edit_commands(&[
EditCommand::Clear,
EditCommand::InsertString(repl_buffer.to_string()),
EditCommand::MoveToPosition(*repl_cursor_pos),
]);
*repl_buffer = "".to_string();
drop(repl_buffer);
*repl_cursor_pos = 0;
drop(repl_cursor_pos);
}
Ok(Signal::CtrlC) => {
// `Reedline` clears the line content. New prompt is shown
if shell_integration {
run_ansi_sequence(&get_command_finished_marker(stack, engine_state))?;
}
}
Ok(Signal::CtrlD) => {
// When exiting clear to a new line
if shell_integration {
run_ansi_sequence(&get_command_finished_marker(stack, engine_state))?;
}
println!();
break;
}
Err(err) => {
let message = err.to_string();
if !message.contains("duration") {
eprintln!("Error: {err:?}");
// TODO: Identify possible error cases where a hard failure is preferable
// Ignoring and reporting could hide bigger problems
// e.g. https://github.com/nushell/nushell/issues/6452
// Alternatively only allow that expected failures let the REPL loop
}
if shell_integration {
run_ansi_sequence(&get_command_finished_marker(stack, engine_state))?;
}
}
}
perf(
"processing line editor input",
start_time,
file!(),
line!(),
column!(),
use_color,
);
perf(
"finished repl loop",
loop_start_time,
file!(),
line!(),
column!(),
use_color,
);
}
Ok(())
}
fn map_nucursorshape_to_cursorshape(shape: NuCursorShape) -> SetCursorStyle {
match shape {
NuCursorShape::Block => SetCursorStyle::SteadyBlock,
NuCursorShape::UnderScore => SetCursorStyle::SteadyUnderScore,
NuCursorShape::Line => SetCursorStyle::SteadyBar,
NuCursorShape::BlinkBlock => SetCursorStyle::BlinkingBlock,
NuCursorShape::BlinkUnderScore => SetCursorStyle::BlinkingUnderScore,
NuCursorShape::BlinkLine => SetCursorStyle::BlinkingBar,
}
}
pub fn get_command_finished_marker(stack: &Stack, engine_state: &EngineState) -> String {
let exit_code = stack
.get_env_var(engine_state, "LAST_EXIT_CODE")
.and_then(|e| e.as_i64().ok());
format!("\x1b]133;D;{}\x1b\\", exit_code.unwrap_or(0))
}
fn run_ansi_sequence(seq: &str) -> Result<(), ShellError> {
io::stdout().write_all(seq.as_bytes()).map_err(|e| {
ShellError::GenericError(
"Error writing ansi sequence".into(),
e.to_string(),
Some(Span::unknown()),
None,
Vec::new(),
)
})?;
io::stdout().flush().map_err(|e| {
ShellError::GenericError(
"Error flushing stdio".into(),
e.to_string(),
Some(Span::unknown()),
None,
Vec::new(),
)
})
}
// Absolute paths with a drive letter, like 'C:', 'D:\', 'E:\foo'
#[cfg(windows)]
static DRIVE_PATH_REGEX: once_cell::sync::Lazy<fancy_regex::Regex> =
once_cell::sync::Lazy::new(|| {
fancy_regex::Regex::new(r"^[a-zA-Z]:[/\\]?").expect("Internal error: regex creation")
});
// A best-effort "does this string look kinda like a path?" function to determine whether to auto-cd
fn looks_like_path(orig: &str) -> bool {
#[cfg(windows)]
{
if DRIVE_PATH_REGEX.is_match(orig).unwrap_or(false) {
return true;
}
}
orig.starts_with('.')
|| orig.starts_with('~')
|| orig.starts_with('/')
|| orig.starts_with('\\')
}
#[test]
fn looks_like_path_windows_drive_path_works() {
let on_windows = cfg!(windows);
assert_eq!(looks_like_path("C:"), on_windows);
assert_eq!(looks_like_path("D:\\"), on_windows);
assert_eq!(looks_like_path("E:/"), on_windows);
assert_eq!(looks_like_path("F:\\some_dir"), on_windows);
assert_eq!(looks_like_path("G:/some_dir"), on_windows);
}