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|
use crate::parse::{self, CompletionContext};
use crate::{BString, Session};
use std::collections::HashMap;
use std::ffi::OsStr;
use std::fs::DirEntry;
use std::os::unix::ffi::OsStrExt;
use std::path::{Path, PathBuf};
use std::sync::{Arc, Mutex};
use std::{env, fs};
pub struct Suggestion {
/// display string that is shown in the possibilities
pub display: BString,
/// *escaped* bytes that can be directly appended into terminal.
pub delta: BString,
}
fn _path_completion(
cc: CompletionContext,
filter: &dyn Fn(&DirEntry) -> bool,
) -> std::io::Result<Vec<Suggestion>> {
let delim = cc.delim;
let mut prefix = cc.partial;
let mut partial_entry = BString::new();
while let Some(c) = prefix.last().cloned() {
if c == b'/' {
break;
}
partial_entry.push(c);
prefix.pop();
}
partial_entry.reverse();
let mut sugs = Vec::new();
if prefix.is_empty() {
prefix.push(b'.');
}
for entry in fs::read_dir(OsStr::from_bytes(&prefix))? {
let entry = entry?;
if !filter(&entry) {
continue;
}
let name = entry.file_name().as_bytes().to_vec();
if name.starts_with(&partial_entry) {
let mut delta = BString::new();
delim.escape(&name[partial_entry.len()..], &mut delta);
let is_dir = entry.metadata().map(|m| m.is_dir()).unwrap_or(false);
if is_dir {
delta.push(b'/');
} else {
delim.write_closing_delimiter(&mut delta);
delta.push(b' ');
}
sugs.push(Suggestion {
display: name,
delta,
});
}
}
Ok(sugs)
}
pub fn path_completion(cc: CompletionContext) -> Vec<Suggestion> {
match _path_completion(cc, &|_| true) {
Ok(suggestions) => suggestions,
Err(err) => {
println!("path completion failed: {err:?}\r");
Vec::new()
}
}
}
pub fn path_exe_completion(cc: CompletionContext) -> Vec<Suggestion> {
match _path_completion(cc, &|d| is_executable(&d.path())) {
Ok(suggestions) => suggestions,
Err(err) => {
println!("path completion failed: {err:?}\r");
Vec::new()
}
}
}
pub fn variable_completion(session: Arc<Mutex<Session>>, prefix: BString) -> Vec<Suggestion> {
let se = session.lock().unwrap();
let mut out = Vec::new();
for var in se.vars.vars() {
if var.starts_with(&prefix) {
out.push(Suggestion {
display: var.to_vec(),
delta: var[prefix.len()..].to_vec(),
});
}
}
drop(se);
for var in env::vars_os() {
let var = var.0.as_bytes();
if var.starts_with(&prefix) {
out.push(Suggestion {
display: var.to_vec(),
delta: var[prefix.len()..].to_vec(),
});
}
}
out
}
#[derive(Default)]
pub struct PathCache {
binaries: HashMap<BString, PathBuf>,
}
fn is_executable(path: &Path) -> bool {
use std::os::unix::fs::PermissionsExt;
fs::metadata(path)
.map(|m| m.permissions().mode() & 0o111 != 0)
.unwrap_or(false)
}
pub fn populate_path_cache(session: Arc<Mutex<Session>>) {
let path_var = env::var_os("PATH").unwrap();
let mut binaries = HashMap::new();
for dir in env::split_paths(&path_var) {
if let Ok(entries) = fs::read_dir(&dir) {
for entry in entries.flatten() {
let path = entry.path();
if path.is_file() && is_executable(&path) {
binaries.insert(path.file_name().unwrap().as_bytes().to_vec(), path);
}
}
}
}
session.lock().unwrap().path_cache = PathCache { binaries };
}
pub fn command_completion(session: Arc<Mutex<Session>>, cc: CompletionContext) -> Vec<Suggestion> {
let se = session.lock().unwrap();
let mut out = Vec::new();
for fun in se
.funs
.keys()
.chain(se.builtins.keys())
.chain(se.path_cache.binaries.keys())
{
if fun.starts_with(&cc.partial) {
let mut delta = BString::new();
cc.delim.escape(&fun[cc.partial.len()..], &mut delta);
cc.delim.write_closing_delimiter(&mut delta);
delta.push(b' ');
out.push(Suggestion {
display: fun.to_vec(),
delta,
})
}
}
out
}
pub struct CompletionResult {
pub kind: parse::CompletionKind,
pub suggestions: Vec<Suggestion>,
pub shared_prefix: BString,
}
impl CompletionResult {
pub fn empty() -> Self {
CompletionResult {
kind: parse::CompletionKind::None,
suggestions: Vec::new(),
shared_prefix: BString::new(),
}
}
}
pub fn completion(session: Arc<Mutex<Session>>, cmd: &[u8]) -> CompletionResult {
let comp = parse::completion_context(
&cmd,
&mut crate::run::Executor::new_for_completion(session.clone()),
);
let kind = comp.kind.clone();
let mut suggestions = match comp.kind {
parse::CompletionKind::Command => command_completion(session.clone(), comp),
parse::CompletionKind::PathCommand => path_exe_completion(comp),
parse::CompletionKind::Argument => path_completion(comp),
parse::CompletionKind::Variable => variable_completion(session.clone(), comp.partial),
parse::CompletionKind::None => return CompletionResult::empty(),
};
suggestions.sort_by(|x, y| x.delta.cmp(&y.delta));
suggestions.dedup_by(|x, y| x.delta == y.delta);
if suggestions.is_empty() {
return CompletionResult {
kind,
..CompletionResult::empty()
};
}
// find longest shared prefix
let mut shared_prefix = &suggestions[0].delta[..];
for s in suggestions.iter() {
let mut new = &shared_prefix[..0];
for i in 0..shared_prefix.len().min(s.delta.len()) {
if shared_prefix[i] != s.delta[i] {
break;
} else {
new = &s.delta[..=i];
}
}
shared_prefix = new;
}
let shared_prefix = shared_prefix.to_vec();
CompletionResult {
kind,
suggestions,
shared_prefix,
}
}
|
