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|
use super::REPL_COMMANDS;
use crate::config::{Config, SharedConfig};
use anyhow::{Context, Result};
use reedline::{
default_emacs_keybindings, ColumnarMenu, DefaultCompleter, Emacs, FileBackedHistory, KeyCode,
KeyModifiers, Keybindings, Prompt, PromptHistorySearch, PromptHistorySearchStatus, Reedline,
ReedlineEvent, ReedlineMenu, ValidationResult, Validator,
};
use std::borrow::Cow;
const MENU_NAME: &str = "completion_menu";
const DEFAULT_MULTILINE_INDICATOR: &str = "::: ";
pub struct Repl {
pub editor: Reedline,
pub prompt: ReplPrompt,
}
impl Repl {
pub fn init(config: SharedConfig) -> Result<Self> {
let multiline_commands: Vec<&'static str> = REPL_COMMANDS
.iter()
.filter(|(_, _, v)| *v)
.map(|(v, _, _)| *v)
.collect();
let completer = Self::create_completer(config.clone());
let keybindings = Self::create_keybindings();
let history = Self::create_history()?;
let menu = Self::create_menu();
let edit_mode = Box::new(Emacs::new(keybindings));
let editor = Reedline::create()
.with_completer(Box::new(completer))
.with_history(history)
.with_menu(menu)
.with_edit_mode(edit_mode)
.with_quick_completions(true)
.with_partial_completions(true)
.with_validator(Box::new(ReplValidator { multiline_commands }))
.with_ansi_colors(true);
let prompt = ReplPrompt(config);
Ok(Self { editor, prompt })
}
fn create_completer(config: SharedConfig) -> DefaultCompleter {
let mut completion: Vec<String> = REPL_COMMANDS
.into_iter()
.map(|(v, _, _)| v.to_string())
.collect();
completion.extend(config.lock().repl_completions());
let mut completer = DefaultCompleter::with_inclusions(&['.', '-', '_']).set_min_word_len(2);
completer.insert(completion.clone());
completer
}
fn create_keybindings() -> Keybindings {
let mut keybindings = default_emacs_keybindings();
keybindings.add_binding(
KeyModifiers::NONE,
KeyCode::Tab,
ReedlineEvent::UntilFound(vec![
ReedlineEvent::Menu(MENU_NAME.to_string()),
ReedlineEvent::MenuNext,
]),
);
keybindings.add_binding(
KeyModifiers::CONTROL,
KeyCode::Char('l'),
ReedlineEvent::ExecuteHostCommand(".clear screen".into()),
);
keybindings
}
fn create_menu() -> ReedlineMenu {
let completion_menu = ColumnarMenu::default().with_name(MENU_NAME);
ReedlineMenu::EngineCompleter(Box::new(completion_menu))
}
fn create_history() -> Result<Box<FileBackedHistory>> {
Ok(Box::new(
FileBackedHistory::with_file(1000, Config::history_file()?)
.with_context(|| "Failed to setup history file")?,
))
}
}
struct ReplValidator {
multiline_commands: Vec<&'static str>,
}
impl Validator for ReplValidator {
fn validate(&self, line: &str) -> ValidationResult {
if line.split('"').count() % 2 == 0 || incomplete_brackets(line, &self.multiline_commands) {
ValidationResult::Incomplete
} else {
ValidationResult::Complete
}
}
}
fn incomplete_brackets(line: &str, multiline_commands: &[&str]) -> bool {
let mut balance: Vec<char> = Vec::new();
let line = line.trim_start();
if !multiline_commands.iter().any(|v| line.starts_with(v)) {
return false;
}
for c in line.chars() {
if c == '{' {
balance.push('}');
} else if c == '}' {
if let Some(last) = balance.last() {
if last == &c {
balance.pop();
}
}
}
}
!balance.is_empty()
}
#[derive(Clone)]
pub struct ReplPrompt(SharedConfig);
impl Prompt for ReplPrompt {
fn render_prompt_left(&self) -> Cow<str> {
let config = self.0.lock();
if let Some(role) = config.role.as_ref() {
role.name.to_string().into()
} else {
Cow::Borrowed("")
}
}
fn render_prompt_right(&self) -> Cow<str> {
Cow::Borrowed("")
}
fn render_prompt_indicator(&self, _prompt_mode: reedline::PromptEditMode) -> Cow<str> {
let config = self.0.lock();
if config.conversation.is_some() {
Cow::Borrowed("＄")
} else {
Cow::Borrowed("〉")
}
}
fn render_prompt_multiline_indicator(&self) -> Cow<str> {
Cow::Borrowed(DEFAULT_MULTILINE_INDICATOR)
}
fn render_prompt_history_search_indicator(
&self,
history_search: PromptHistorySearch,
) -> Cow<str> {
let prefix = match history_search.status {
PromptHistorySearchStatus::Passing => "",
PromptHistorySearchStatus::Failing => "failing ",
};
// NOTE: magic strings, given there is logic on how these compose I am not sure if it
// is worth extracting in to static constant
Cow::Owned(format!(
"({}reverse-search: {}) ",
prefix, history_search.term
))
}
}
|
