nushell/src/repl.rs

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Rust
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use crate::is_perf_true;
use crate::reedline_config::{add_completion_menu, add_history_menu};
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use crate::{config_files, prompt_update, reedline_config};
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use crate::{
reedline_config::KeybindingsMode,
utils::{eval_source, gather_parent_env_vars, report_error},
};
use log::info;
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use log::trace;
use miette::{IntoDiagnostic, Result};
use nu_cli::{NuCompleter, NuHighlighter, NuValidator, NushellPrompt};
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use nu_color_config::get_color_config;
use nu_engine::convert_env_values;
use nu_parser::lex;
use nu_protocol::{
engine::{EngineState, StateWorkingSet},
Config, ShellError, Span, Value, CONFIG_VARIABLE_ID,
};
use nu_protocol::{PipelineData, Spanned};
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use reedline::{DefaultHinter, Emacs, Vi};
use std::{sync::atomic::Ordering, time::Instant};
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pub(crate) fn evaluate(
engine_state: &mut EngineState,
config_file: Option<Spanned<String>>,
) -> Result<()> {
// use crate::logger::{configure, logger};
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use reedline::{FileBackedHistory, Reedline, Signal};
let mut entry_num = 0;
let mut nu_prompt = NushellPrompt::new();
let mut stack = nu_protocol::engine::Stack::new();
// First, set up env vars as strings only
gather_parent_env_vars(engine_state);
// Set up our initial config to start from
stack.vars.insert(
CONFIG_VARIABLE_ID,
Value::Record {
cols: vec![],
vals: vec![],
span: Span::new(0, 0),
},
);
if is_perf_true() {
info!("read_plugin_file {}:{}:{}", file!(), line!(), column!());
}
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#[cfg(feature = "plugin")]
config_files::read_plugin_file(engine_state, &mut stack);
if is_perf_true() {
info!("read_config_file {}:{}:{}", file!(), line!(), column!());
}
config_files::read_config_file(engine_state, &mut stack, config_file);
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let history_path = config_files::create_history_path();
// Load config struct form config variable
let config = match stack.get_config() {
Ok(config) => config,
Err(e) => {
let working_set = StateWorkingSet::new(engine_state);
report_error(&working_set, &e);
Config::default()
}
};
// logger(|builder| {
// configure(&config.log_level, builder)?;
// // trace_filters(self, builder)?;
// // debug_filters(self, builder)?;
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// Ok(())
// })?;
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if is_perf_true() {
info!(
"translate environment vars {}:{}:{}",
file!(),
line!(),
column!()
);
}
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// Translate environment variables from Strings to Values
if let Some(e) = convert_env_values(engine_state, &stack, &config) {
let working_set = StateWorkingSet::new(engine_state);
report_error(&working_set, &e);
}
// seed the cmd_duration_ms env var
stack.add_env_var(
"CMD_DURATION_MS".into(),
Value::String {
val: "0823".to_string(),
span: Span { start: 0, end: 0 },
},
);
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loop {
if is_perf_true() {
info!(
"load config each loop {}:{}:{}",
file!(),
line!(),
column!()
);
}
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let config = match stack.get_config() {
Ok(config) => config,
Err(e) => {
let working_set = StateWorkingSet::new(engine_state);
report_error(&working_set, &e);
Config::default()
}
};
//Reset the ctrl-c handler
if let Some(ctrlc) = &mut engine_state.ctrlc {
ctrlc.store(false, Ordering::SeqCst);
}
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if is_perf_true() {
info!("setup line editor {}:{}:{}", file!(), line!(), column!());
}
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let mut line_editor = Reedline::create()
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.into_diagnostic()?
.with_highlighter(Box::new(NuHighlighter {
engine_state: engine_state.clone(),
config: config.clone(),
}))
.with_animation(config.animate_prompt)
.with_validator(Box::new(NuValidator {
engine_state: engine_state.clone(),
}))
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.with_completer(Box::new(NuCompleter::new(
engine_state.clone(),
stack.vars.get(&CONFIG_VARIABLE_ID).cloned(),
)))
.with_quick_completions(config.quick_completions)
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.with_ansi_colors(config.use_ansi_coloring);
if is_perf_true() {
info!("setup reedline {}:{}:{}", file!(), line!(), column!());
}
line_editor = add_completion_menu(line_editor, &config);
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line_editor = add_history_menu(line_editor, &config);
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if is_perf_true() {
info!("setup colors {}:{}:{}", file!(), line!(), column!());
}
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//FIXME: if config.use_ansi_coloring is false then we should
// turn off the hinter but I don't see any way to do that yet.
let color_hm = get_color_config(&config);
if is_perf_true() {
info!(
"setup history and hinter {}:{}:{}",
file!(),
line!(),
column!()
);
}
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line_editor = if let Some(history_path) = history_path.clone() {
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let history = std::fs::read_to_string(&history_path);
if history.is_ok() {
line_editor
.with_hinter(Box::new(
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DefaultHinter::default().with_style(color_hm["hints"]),
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))
.with_history(Box::new(
FileBackedHistory::with_file(
config.max_history_size as usize,
history_path.clone(),
)
.into_diagnostic()?,
))
.into_diagnostic()?
} else {
line_editor
}
} else {
line_editor
};
if is_perf_true() {
info!("setup keybindings {}:{}:{}", file!(), line!(), column!());
}
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// Changing the line editor based on the found keybindings
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line_editor = match reedline_config::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
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}
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};
if is_perf_true() {
info!("prompt_update {}:{}:{}", file!(), line!(), column!());
}
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let prompt = prompt_update::update_prompt(&config, engine_state, &stack, &mut nu_prompt);
entry_num += 1;
if is_perf_true() {
info!(
"finished setup, starting repl {}:{}:{}",
file!(),
line!(),
column!()
);
}
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let input = line_editor.read_line(prompt);
match input {
Ok(Signal::Success(s)) => {
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let start_time = Instant::now();
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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 path = nu_path::expand_path_with(&s, &cwd);
let orig = s.clone();
if (orig.starts_with('.')
|| orig.starts_with('~')
|| orig.starts_with('/')
|| orig.starts_with('\\'))
&& 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),
);
}
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)
};
//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 { start: 0, end: 0 },
},
);
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
};
shells[current_shell] = Value::String { val: path, span };
stack.add_env_var("NUSHELL_SHELLS".into(), Value::List { vals: shells, span });
} else {
trace!("eval source: {}", s);
eval_source(
engine_state,
&mut stack,
s.as_bytes(),
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&format!("entry #{}", entry_num),
PipelineData::new(Span::new(0, 0)),
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);
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stack.add_env_var(
"CMD_DURATION_MS".into(),
Value::String {
val: format!("{}", start_time.elapsed().as_millis()),
span: Span { start: 0, end: 0 },
},
);
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}
// FIXME: permanent state changes like this hopefully in time can be removed
// and be replaced by just passing the cwd in where needed
if let Some(cwd) = stack.get_env_var(engine_state, "PWD") {
let path = cwd.as_string()?;
let _ = std::env::set_current_dir(path);
engine_state.env_vars.insert("PWD".into(), cwd);
}
}
Ok(Signal::CtrlC) => {
// `Reedline` clears the line content. New prompt is shown
}
Ok(Signal::CtrlD) => {
// When exiting clear to a new line
println!();
break;
}
Ok(Signal::CtrlL) => {
line_editor.clear_screen().into_diagnostic()?;
}
Err(err) => {
let message = err.to_string();
if !message.contains("duration") {
println!("Error: {:?}", err);
}
}
}
}
Ok(())
}