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use std::{collections::BTreeMap, io::Read, sync::RwLock};
fn read1() -> Option<u8> {
let mut buf = [0];
match std::io::stdin().lock().read_exact(&mut buf) {
Ok(_) => Some(buf[0]),
Err(_) => None,
}
}
pub fn read(debug: bool) -> Option<KbInput<'static>> {
let mut reader = EscapingStdinReader::new(et());
loop {
let Some(b) = read1() else {
break None;
};
match reader.process_byte(b) {
ByteProcessingResult::Done(kb) => {
if debug {
if let KbInput::Escape(e) = &kb {
for k in e.keys.iter() {
print!("{k} ")
}
}
println!("{}\r", kb.as_bytes().escape_ascii());
}
if let KbInput::InvalidEscape(x) = &kb
&& x.len() == 1
{
break Some(KbInput::Key([x[0]]));
}
break Some(kb);
}
ByteProcessingResult::Continue(r) => reader = r,
}
}
}
struct EscapingStdinReader<'a> {
buf: Vec<u8>,
trie: &'a EscapeTrie,
}
enum ByteProcessingResult<'a> {
Done(KbInput<'a>),
Continue(EscapingStdinReader<'a>),
}
impl<'a> EscapingStdinReader<'a> {
pub fn new(trie: &'a EscapeTrie) -> Self {
Self {
buf: Vec::new(),
trie,
}
}
pub fn process_byte(mut self, byte: u8) -> ByteProcessingResult<'a> {
match self.trie {
EscapeTrie::Done(_) => ByteProcessingResult::Done(KbInput::Key([byte])),
EscapeTrie::More(trie) => {
self.buf.push(byte);
match trie.get(&byte) {
Some(EscapeTrie::Done(keys)) => {
ByteProcessingResult::Done(KbInput::Escape(Escape {
keys: &keys[..],
value: self.buf,
}))
}
Some(trie) => {
self.trie = trie;
ByteProcessingResult::Continue(self)
}
None => ByteProcessingResult::Done(KbInput::InvalidEscape(self.buf)),
}
}
}
}
}
enum EscapeTrie {
Done(Vec<&'static str>),
More(BTreeMap<u8, EscapeTrie>),
}
#[derive(Clone, Debug)]
pub enum KbInput<'a> {
Key([u8; 1]),
Escape(Escape<'a>),
InvalidEscape(Vec<u8>),
}
impl<'a> KbInput<'a> {
pub fn as_bytes(&'a self) -> &'a [u8] {
match self {
KbInput::Key(x) => &x[..],
KbInput::Escape(e) => &e.value[..],
KbInput::InvalidEscape(e) => &e[..],
}
}
}
#[derive(Clone, Debug)]
pub struct Escape<'a> {
pub keys: &'a [&'a str],
pub value: Vec<u8>,
}
use terminfo_lean::parse::Terminfo;
static TERMINFO: RwLock<Option<&'static Terminfo<'static>>> = RwLock::new(None);
static ESCAPE_TRIE: RwLock<Option<&'static EscapeTrie>> = RwLock::new(None);
fn parse_terminfo() -> Result<Terminfo<'static>, ()> {
let term = std::env::var_os("TERM").unwrap_or_else(|| "xterm".into());
let terminfo_file_path = terminfo_lean::locate::locate(&term)
.map_err(|e| println!("failed to locate terminfo file for terminal {term:?}: {e:?}",))?;
let mut terminfo_file = std::fs::File::open(&terminfo_file_path).map_err(|e| {
println!("failed to open terminfo file at location {terminfo_file_path:?}: {e:?}")
})?;
let mut buf = Vec::new();
terminfo_file.read_to_end(&mut buf).map_err(|e| {
println!("failed to read terminfo file at location {terminfo_file_path:?}: {e:?}")
})?;
buf.shrink_to_fit();
let terminfo = terminfo_lean::parse::parse(buf.leak()).map_err(|e| {
println!("failed to parse terminfo file at location {terminfo_file_path:?}: {e:?}")
})?;
Ok(terminfo)
}
fn parse_terminfo_backup() -> Terminfo<'static> {
todo!("panic-safe backup terminfo")
}
pub fn setup() {
let ti = parse_terminfo().unwrap_or_else(|_| {
println!("using backup terminfo (might not be correct for this terminal)");
parse_terminfo_backup()
});
let ti: &'static _ = Box::leak(Box::new(ti));
TERMINFO.clear_poison();
*TERMINFO.write().unwrap() = Some(ti);
let et = Box::leak(Box::new(EscapeTrie::from(ti)));
ESCAPE_TRIE.clear_poison();
*ESCAPE_TRIE.write().unwrap() = Some(et);
}
pub fn ti() -> &'static Terminfo<'static> {
TERMINFO.read().unwrap().unwrap()
}
fn et() -> &'static EscapeTrie {
ESCAPE_TRIE.read().unwrap().unwrap()
}
fn is_parametrized(x: &[u8]) -> bool {
let mut pct = false;
for &b in x {
if b == b'%' {
pct = !pct;
} else if pct {
return true;
}
}
false
}
fn trie_from_words(words: Vec<(&'static str, &[u8])>) -> EscapeTrie {
let mut tree = BTreeMap::new();
let mut all_empty = true;
for (key, val) in words.iter() {
if let Some(byte) = val.first() {
all_empty = false;
tree.entry(byte)
.or_insert_with(Vec::new)
.push((*key, &val[1..]));
}
}
if all_empty {
EscapeTrie::Done(words.into_iter().map(|x| x.0).collect())
} else {
let trie = tree
.into_iter()
.map(|(k, v)| (*k, trie_from_words(v)))
.collect();
EscapeTrie::More(trie)
}
}
impl From<&Terminfo<'static>> for EscapeTrie {
fn from(ti: &Terminfo<'static>) -> Self {
let w: Vec<(&'static str, &'static [u8])> = ti
.strings
.iter()
.filter(|(k, v)| k.starts_with("k") && !is_parametrized(v))
.map(|(k, v)| (*k, *v))
.collect();
trie_from_words(w)
}
}
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