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use std::borrow::Cow::{self, Borrowed, Owned};
use rustyline::highlight::Highlighter;
use rustyline::hint::HistoryHinter;
use rustyline::history::DefaultHistory;
use rustyline::{
Cmd, ConditionalEventHandler, Editor, Event, EventContext, EventHandler, KeyEvent, RepeatCount,
Result,
};
use rustyline::{Completer, Helper, Hinter, Validator};
#[derive(Completer, Helper, Hinter, Validator)]
struct MyHelper(#[rustyline(Hinter)] HistoryHinter);
impl Highlighter for MyHelper {
fn highlight_prompt<'b, 's: 'b, 'p: 'b>(
&'s self,
prompt: &'p str,
default: bool,
) -> Cow<'b, str> {
if default {
Owned(format!("\x1b[1;32m{prompt}\x1b[m"))
} else {
Borrowed(prompt)
}
}
fn highlight_hint<'h>(&self, hint: &'h str) -> Cow<'h, str> {
Owned(format!("\x1b[1m{hint}\x1b[m"))
}
}
#[derive(Clone)]
struct CompleteHintHandler;
impl ConditionalEventHandler for CompleteHintHandler {
fn handle(&self, evt: &Event, _: RepeatCount, _: bool, ctx: &EventContext) -> Option<Cmd> {
if !ctx.has_hint() {
return None; // default
}
if let Some(k) = evt.get(0) {
#[allow(clippy::if_same_then_else)]
if *k == KeyEvent::ctrl('E') {
Some(Cmd::CompleteHint)
} else if *k == KeyEvent::alt('f') && ctx.line().len() == ctx.pos() {
let text = ctx.hint_text()?;
let mut start = 0;
if let Some(first) = text.chars().next() {
if !first.is_alphanumeric() {
start = text.find(|c: char| c.is_alphanumeric()).unwrap_or_default();
}
}
let text = text
.chars()
.enumerate()
.take_while(|(i, c)| *i <= start || c.is_alphanumeric())
.map(|(_, c)| c)
.collect::<String>();
Some(Cmd::Insert(1, text))
} else {
None
}
} else {
unreachable!()
}
}
}
struct TabEventHandler;
impl ConditionalEventHandler for TabEventHandler {
fn handle(&self, evt: &Event, n: RepeatCount, _: bool, ctx: &EventContext) -> Option<Cmd> {
debug_assert_eq!(*evt, Event::from(KeyEvent::from('\t')));
if ctx.line()[..ctx.pos()]
.chars()
.rev()
.next()
.filter(|c| c.is_whitespace())
.is_some()
{
Some(Cmd::SelfInsert(n, '\t'))
} else {
None // default complete
}
}
}
fn main() -> Result<()> {
let mut rl = Editor::<MyHelper, DefaultHistory>::new()?;
rl.set_helper(Some(MyHelper(HistoryHinter::new())));
let ceh = Box::new(CompleteHintHandler);
rl.bind_sequence(KeyEvent::ctrl('E'), EventHandler::Conditional(ceh.clone()));
rl.bind_sequence(KeyEvent::alt('f'), EventHandler::Conditional(ceh));
rl.bind_sequence(
KeyEvent::from('\t'),
EventHandler::Conditional(Box::new(TabEventHandler)),
);
rl.bind_sequence(
Event::KeySeq(vec![KeyEvent::ctrl('X'), KeyEvent::ctrl('E')]),
EventHandler::Simple(Cmd::Suspend), // TODO external editor
);
loop {
let line = rl.readline("> ")?;
rl.add_history_entry(line.as_str())?;
println!("Line: {line}");
}
}
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