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|
use nix::sys::stat::Mode;
use radix_trie::{Trie, TrieCommon};
use rustyline::hint::{Hint, Hinter};
use rustyline::Context;
use rustyline_derive::{Completer, Helper, Highlighter, Validator};
use std::ffi::OsString;
use std::os::unix::fs::PermissionsExt;
static EXE_MASK: Mode = Mode::from_bits_truncate(0o111);
#[test]
fn test_exe_mask() {
let a = Mode::from_bits_truncate(0o100755);
assert!(a.contains(EXE_MASK));
}
#[derive(Completer, Helper, Validator, Highlighter)]
pub struct CommandHinter {
cmd_hints: Trie<String, CompleterHint>,
path_hints: Trie<String, CompleterHint>,
}
#[derive(Hash, Debug, PartialEq, Eq)]
pub struct CompleterHint {
display: String,
complete_up_to: usize,
}
impl Hint for CompleterHint {
fn display(&self) -> &str {
&self.display
}
fn completion(&self) -> Option<&str> {
if self.complete_up_to > 0 {
Some(&self.display[..self.complete_up_to])
} else {
None
}
}
}
impl CompleterHint {
fn new(text: &str, complete_up_to: &str) -> CompleterHint {
assert!(text.starts_with(complete_up_to));
CompleterHint {
display: text.into(),
complete_up_to: complete_up_to.len(),
}
}
fn from_path(text: OsString) -> CompleterHint {
CompleterHint {
complete_up_to: text.len(),
display: text.into_string().unwrap(),
}
}
fn suffix(&self, strip_chars: usize) -> CompleterHint {
CompleterHint {
display: self.display[strip_chars..].to_owned(),
complete_up_to: self.complete_up_to.saturating_sub(strip_chars),
}
}
}
impl CommandHinter {
pub fn new() -> Result<CommandHinter, std::io::Error> {
let mut cmd_hints = Trie::new();
let path_hints = Trie::new();
for path in std::env::var("PATH").unwrap_or_default().split(":") {
#[cfg(debug_assertions)]
println!("+index {}", path);
if let Ok(entries) = std::fs::read_dir(path) {
for x in entries {
if let Ok(entry) = x {
let mode = Mode::from_bits_truncate(entry.metadata()?.permissions().mode());
if mode.contains(EXE_MASK) {
cmd_hints.insert(
entry.file_name().into_string().unwrap(),
CompleterHint::from_path(entry.file_name()),
);
}
}
}
}
}
Ok(CommandHinter {
cmd_hints,
path_hints,
})
}
pub fn set_cwd(&mut self, path: &std::path::PathBuf) {
self.path_hints = Trie::new();
if let Ok(entries) = std::fs::read_dir(path) {
for x in entries {
if let Ok(entry) = x {
self.path_hints.insert(
entry.file_name().into_string().unwrap(),
CompleterHint::from_path(entry.file_name()),
);
}
}
}
}
}
fn hints(
trie: &Trie<String, CompleterHint>,
line: &str,
pos: usize,
) -> Option<std::collections::VecDeque<CompleterHint>> {
match trie.get_raw_descendant(line) {
Some(subtrie) => Some(
subtrie
.values()
.filter_map(|hint| {
if pos > 0 && hint.display.starts_with(&line[..pos]) {
Some(hint.suffix(pos))
} else {
None
}
})
.collect(),
),
None => None,
}
}
impl Hinter for CommandHinter {
type Hint = CompleterHint;
/// Takes the currently edited `line` with the cursor `pos`ition and
/// returns the string that should be displayed or `None`
/// if no hint is available for the text the user currently typed.
fn hint(&self, line: &str, pos: usize, _ctx: &Context<'_>) -> Option<CompleterHint> {
if line.is_empty() {
return None;
}
if pos < line.len() {
return None;
}
if let Some(mut idx) = line.rfind(' ') {
idx += 1;
if pos <= idx {
return None;
}
return hints(&self.path_hints, &line[idx..], pos - idx)
.and_then(|mut l| l.pop_front());
}
hints(&self.cmd_hints, line, pos).and_then(|mut l| l.pop_front())
}
}
|
