mirror of https://github.com/sharkdp/fd.git
251 lines
6.5 KiB
Rust
251 lines
6.5 KiB
Rust
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use std::path::MAIN_SEPARATOR;
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use std::borrow::Cow;
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#[cfg(windows)]
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const ESCAPE: char = '^';
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#[cfg(not(windows))]
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const ESCAPE: char = '\\';
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/// A builder for efficiently generating input strings.
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///
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/// After choosing your required specs, the `get()` method will escape special characters found
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/// in the input. Allocations will only occur if special characters are found that need to be
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/// escaped.
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pub struct Input<'a> {
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data: &'a str,
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}
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impl<'a> Input<'a> {
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/// Creates a new `Input` structure, which provides access to command-building
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/// primitives, such as `basename()` and `dirname()`.
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pub fn new(data: &'a str) -> Input<'a> {
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Input { data }
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}
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/// Removes the parent component of the path
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pub fn basename(&'a mut self) -> &'a mut Self {
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let mut index = 0;
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for (id, character) in self.data.char_indices() {
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if character == MAIN_SEPARATOR {
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index = id;
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}
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}
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if index != 0 {
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self.data = &self.data[index + 1..]
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}
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self
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}
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/// Removes the extension from the path
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pub fn remove_extension(&'a mut self) -> &'a mut Self {
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let mut dir_index = 0;
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let mut ext_index = 0;
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for (id, character) in self.data.char_indices() {
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if character == MAIN_SEPARATOR {
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dir_index = id;
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}
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if character == '.' {
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ext_index = id;
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}
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}
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// Account for hidden files and directories
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if ext_index != 0 && dir_index + 2 <= ext_index {
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self.data = &self.data[0..ext_index];
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}
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self
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}
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/// Removes the basename from the path.
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pub fn dirname(&'a mut self) -> &'a mut Self {
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let mut index = 0;
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for (id, character) in self.data.char_indices() {
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if character == MAIN_SEPARATOR {
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index = id;
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}
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}
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self.data = if index == 0 {
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"."
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} else {
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&self.data[0..index]
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};
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self
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}
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pub fn get(&'a self) -> Cow<'a, str> {
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fn char_is_quotable(x: char) -> bool {
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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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'&',
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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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'|',
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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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'?',
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'`',
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].contains(&x)
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};
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// If a quotable character is found, we will use that position for allocating.
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let pos = match self.data.find(char_is_quotable) {
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Some(pos) => pos,
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// Otherwise, we will return the contents of `data` without allocating.
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None => return Cow::Borrowed(self.data),
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};
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// When building the input string, we will start by adding the characters that
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// we've already verified to be free of special characters.
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let mut owned = String::with_capacity(self.data.len());
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owned.push_str(&self.data[..pos]);
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owned.push(ESCAPE);
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// This slice contains the data that is left to be scanned for special characters.
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// If multiple characters are found, this slice will be sliced and updated multiple times.
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let mut slice = &self.data[pos..];
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// Repeatedly search for special characters until all special characters have been found,
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// appending and inserting the escape character each time, as well as updating our
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// starting position.
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while let Some(pos) = slice[1..].find(char_is_quotable) {
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owned.push_str(&slice[..pos + 1]);
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owned.push(ESCAPE);
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slice = &slice[pos + 1..];
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}
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// Finally, we return our newly-allocated input string.
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owned.push_str(slice);
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Cow::Owned(owned)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::{MAIN_SEPARATOR, Input};
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fn correct(input: &str) -> String {
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let mut sep = String::new();
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sep.push(MAIN_SEPARATOR);
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input.replace('/', &sep)
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}
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#[test]
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fn path_remove_ext_simple() {
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assert_eq!(&Input::new("foo.txt").remove_extension().get(), "foo");
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}
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#[test]
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fn path_remove_ext_dir() {
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assert_eq!(
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&Input::new(&correct("dir/foo.txt")).remove_extension().get(),
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&correct("dir/foo")
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);
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}
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#[test]
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fn path_hidden() {
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assert_eq!(&Input::new(".foo").remove_extension().get(), ".foo")
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}
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#[test]
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fn path_remove_ext_utf8() {
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assert_eq!(&Input::new("💖.txt").remove_extension().get(), "💖");
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}
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#[test]
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fn path_remove_ext_empty() {
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assert_eq!(&Input::new("").remove_extension().get(), "");
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}
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#[test]
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fn path_basename_simple() {
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assert_eq!(&Input::new("foo.txt").basename().get(), "foo.txt");
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}
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#[test]
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fn path_basename_dir() {
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assert_eq!(
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&Input::new(&correct("dir/foo.txt")).basename().get(),
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"foo.txt"
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);
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}
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#[test]
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fn path_basename_empty() {
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assert_eq!(&Input::new("").basename().get(), "");
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}
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#[test]
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fn path_basename_utf8() {
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assert_eq!(
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&Input::new(&correct("💖/foo.txt")).basename().get(),
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"foo.txt"
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);
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assert_eq!(
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&Input::new(&correct("dir/💖.txt")).basename().get(),
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"💖.txt"
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);
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}
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#[test]
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fn path_dirname_simple() {
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assert_eq!(&Input::new("foo.txt").dirname().get(), ".");
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}
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#[test]
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fn path_dirname_dir() {
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assert_eq!(&Input::new(&correct("dir/foo.txt")).dirname().get(), "dir");
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}
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#[test]
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fn path_dirname_utf8() {
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assert_eq!(
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&Input::new(&correct("💖/foo.txt")).dirname().get(),
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"💖"
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);
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assert_eq!(&Input::new(&correct("dir/💖.txt")).dirname().get(), "dir");
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}
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#[test]
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fn path_dirname_empty() {
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assert_eq!(&Input::new("").dirname().get(), ".");
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}
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#[cfg(windows)]
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#[test]
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fn path_special_chars() {
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assert_eq!(
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&Input::new("A Directory\\And A File").get(),
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"A^ Directory\\And^ A^ File"
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);
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}
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#[cfg(not(windows))]
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#[test]
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fn path_special_chars() {
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assert_eq!(
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&Input::new("A Directory/And A File").get(),
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"A\\ Directory/And\\ A\\ File"
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);
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}
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}
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