245 lines
8.6 KiB
Rust
245 lines
8.6 KiB
Rust
/*
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* meli - lib.rs
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*
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* Copyright 2017 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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//! A `ShellExpandTrait` to expand paths like a shell.
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#[cfg(not(any(target_os = "netbsd", target_os = "macos")))]
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use std::os::unix::io::AsRawFd;
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use std::{
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ffi::OsStr,
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os::unix::ffi::OsStrExt,
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path::{Path, PathBuf},
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};
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use smallvec::SmallVec;
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pub trait ShellExpandTrait {
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fn expand(&self) -> PathBuf;
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fn complete(&self, force: bool) -> SmallVec<[String; 128]>;
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}
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impl ShellExpandTrait for Path {
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fn expand(&self) -> PathBuf {
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let mut ret = PathBuf::new();
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for c in self.components() {
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let c_to_str = c.as_os_str().to_str();
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match c_to_str {
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Some("~") => {
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if let Ok(home_dir) = std::env::var("HOME") {
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ret.push(home_dir)
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} else {
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return PathBuf::new();
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}
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}
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Some(var) if var.starts_with('$') => {
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let env_name = var.split_at(1).1;
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if env_name.chars().all(char::is_uppercase) {
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ret.push(std::env::var(env_name).unwrap_or_default());
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} else {
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ret.push(c);
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}
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}
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Some(_) => {
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ret.push(c);
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}
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None => {
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/* path is invalid */
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return PathBuf::new();
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}
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}
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}
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ret
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}
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#[cfg(target_os = "linux")]
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fn complete(&self, force: bool) -> SmallVec<[String; 128]> {
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use std::convert::TryFrom;
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use libc::dirent64;
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use nix::fcntl::OFlag;
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const BUF_SIZE: ::libc::size_t = 8 << 10;
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let (prefix, _match) = if self.as_os_str().as_bytes().ends_with(b"/.") {
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(self.components().as_path(), OsStr::from_bytes(b"."))
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} else if self.exists() && (!force || self.as_os_str().as_bytes().ends_with(b"/")) {
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return SmallVec::new();
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} else {
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let last_component = self
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.components()
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.last()
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.map(|c| c.as_os_str())
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.unwrap_or_else(|| OsStr::from_bytes(b""));
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let prefix = if let Some(p) = self.parent() {
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p
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} else {
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return SmallVec::new();
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};
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(prefix, last_component)
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};
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let dir = match ::nix::dir::Dir::openat(
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::libc::AT_FDCWD,
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prefix,
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OFlag::O_DIRECTORY | OFlag::O_NOATIME | OFlag::O_RDONLY | OFlag::O_CLOEXEC,
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::nix::sys::stat::Mode::S_IRUSR | ::nix::sys::stat::Mode::S_IXUSR,
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)
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.or_else(|_| {
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::nix::dir::Dir::openat(
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::libc::AT_FDCWD,
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prefix,
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OFlag::O_DIRECTORY | OFlag::O_RDONLY | OFlag::O_CLOEXEC,
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::nix::sys::stat::Mode::S_IRUSR | ::nix::sys::stat::Mode::S_IXUSR,
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)
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}) {
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Ok(dir) => dir,
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Err(err) => {
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debug!(prefix);
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debug!(err);
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return SmallVec::new();
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}
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};
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let mut buf: Vec<u8> = Vec::with_capacity(BUF_SIZE);
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let mut entries = SmallVec::new();
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loop {
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let n: i64 = unsafe {
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::libc::syscall(
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::libc::SYS_getdents64,
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dir.as_raw_fd(),
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buf.as_ptr(),
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BUF_SIZE - 256,
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)
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};
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let Ok(n) = usize::try_from(n) else {
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if n == 0 {
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break;
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}
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return SmallVec::new();
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};
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unsafe {
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buf.set_len(n);
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}
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let mut pos = 0;
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while pos < n {
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let dir = unsafe { std::mem::transmute::<&[u8], &[dirent64]>(&buf[pos..]) };
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let entry = unsafe { std::ffi::CStr::from_ptr(dir[0].d_name.as_ptr()) };
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if entry.to_bytes() != b"."
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&& entry.to_bytes() != b".."
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&& entry.to_bytes().starts_with(_match.as_bytes())
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{
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if dir[0].d_type == ::libc::DT_DIR && !entry.to_bytes().ends_with(b"/") {
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let mut s = unsafe {
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String::from_utf8_unchecked(
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entry.to_bytes()[_match.as_bytes().len()..].to_vec(),
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)
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};
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s.push('/');
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entries.push(s);
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} else {
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entries.push(unsafe {
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String::from_utf8_unchecked(
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entry.to_bytes()[_match.as_bytes().len()..].to_vec(),
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)
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});
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}
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}
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pos += dir[0].d_reclen as usize;
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}
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// https://github.com/romkatv/gitstatus/blob/caf44f7aaf33d0f46e6749e50595323c277e0908/src/dir.cc
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// "It's tempting to bail here if n + sizeof(linux_dirent64) +
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// 512 <= n. After all, there was enough space
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// for another entry but SYS_getdents64 didn't write it, so this
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// must be the end of the directory listing,
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// right? Unfortunately, no. SYS_getdents64 is finicky.
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// It sometimes writes a partial list of entries even if the
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// full list would fit."
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}
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entries
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}
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#[cfg(not(target_os = "linux"))]
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fn complete(&self, force: bool) -> SmallVec<[String; 128]> {
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let mut entries = SmallVec::new();
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let (prefix, _match) = {
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if self.exists() && (!force || self.as_os_str().as_bytes().ends_with(b"/")) {
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// println!("{} {:?}", self.display(), self.components().last());
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return entries;
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} else {
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let last_component = self
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.components()
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.last()
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.map(|c| c.as_os_str())
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.unwrap_or_else(|| OsStr::from_bytes(b""));
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let prefix = if let Some(p) = self.parent() {
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p
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} else {
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return entries;
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};
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(prefix, last_component)
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}
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};
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if force && self.is_dir() && !self.as_os_str().as_bytes().ends_with(b"/") {
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entries.push("/".to_string());
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}
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if let Ok(iter) = std::fs::read_dir(prefix) {
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for entry in iter.flatten() {
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if entry.path().as_os_str().as_bytes() != b"."
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&& entry.path().as_os_str().as_bytes() != b".."
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&& entry
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.path()
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.as_os_str()
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.as_bytes()
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.starts_with(_match.as_bytes())
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{
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if entry.path().is_dir() && !entry.path().as_os_str().as_bytes().ends_with(b"/")
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{
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let mut s = unsafe {
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String::from_utf8_unchecked(
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entry.path().as_os_str().as_bytes()[_match.as_bytes().len()..]
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.to_vec(),
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)
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};
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s.push('/');
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entries.push(s);
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} else {
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entries.push(unsafe {
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String::from_utf8_unchecked(
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entry.path().as_os_str().as_bytes()[_match.as_bytes().len()..]
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.to_vec(),
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)
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});
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}
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}
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}
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}
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entries
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}
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}
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#[test]
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fn test_shellexpandtrait() {
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assert!(Path::new("~").expand().complete(false).is_empty());
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assert!(!Path::new("~").expand().complete(true).is_empty());
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}
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