mirror of
https://github.com/Llewellynvdm/exa.git
synced 2024-11-10 14:50:57 +00:00
Do column width calculations ourselves (speedup)
Instead of stripping the ANSI formatting characters from our strings, work out the length without them and use that. This is per-column, but most of them are simple (just the same number of characters in the non-coloured string). Sometimes, this is really simple: for example, trwxrwxrwx permissions strings are always going to be ten characters long, and the strings that get returned are chock full of ANSI escape codes. This should have a small benefit on performance.
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parent
f82dc741de
commit
449592c150
@ -1,5 +1,7 @@
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use std::iter::repeat;
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use ansi_term::Style;
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#[derive(PartialEq, Show)]
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pub enum Column {
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Permissions,
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@ -79,3 +81,17 @@ impl Alignment {
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}
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}
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}
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pub struct Cell {
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pub length: usize,
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pub text: String,
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}
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impl Cell {
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pub fn paint(style: Style, string: &str) -> Cell {
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Cell {
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text: style.paint(string).to_string(),
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length: string.len(),
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}
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}
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}
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113
src/file.rs
113
src/file.rs
@ -9,7 +9,7 @@ use users::Users;
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use number_prefix::{binary_prefix, decimal_prefix, Prefixed, Standalone, PrefixNames};
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use column::{Column, SizeFormat};
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use column::{Column, SizeFormat, Cell};
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use column::Column::*;
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use dir::Dir;
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use filetype::HasType;
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@ -68,7 +68,7 @@ impl<'a> File<'a> {
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}
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/// Get the data for a column, formatted as a coloured string.
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pub fn display<U: Users>(&self, column: &Column, users_cache: &mut U) -> String {
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pub fn display<U: Users>(&self, column: &Column, users_cache: &mut U) -> Cell {
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match *column {
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Permissions => self.permissions_string(),
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FileName => self.file_name_view(),
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@ -86,11 +86,16 @@ impl<'a> File<'a> {
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///
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/// It consists of the file name coloured in the appropriate style, and,
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/// if it's a symlink, an arrow pointing to the file it links to, also
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/// coloured in the appropriate style. Files that don't exist will be
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/// coloured red.
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pub fn file_name_view(&self) -> String {
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let name = self.name.as_slice();
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let displayed_name = self.file_colour().paint(name);
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/// coloured in the appropriate style.
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///
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/// If the symlink target doesn't exist, then instead of displaying
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/// an error, highlight the target and arrow in red. The error would
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/// be shown out of context, and it's almost always because the
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/// target doesn't exist.
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pub fn file_name_view(&self) -> Cell {
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let name = &*self.name;
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let style = self.file_colour();
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if self.stat.kind == io::FileType::Symlink {
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match fs::readlink(&self.path) {
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Ok(path) => {
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@ -98,13 +103,31 @@ impl<'a> File<'a> {
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Some(dir) => dir.path.join(path),
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None => path,
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};
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format!("{} {}", displayed_name, self.target_file_name_and_arrow(&target_path))
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match self.target_file(&target_path) {
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Ok(file) => Cell {
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length: 0, // These lengths are never actually used...
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text: format!("{} {} {}{}{}",
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style.paint(name),
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GREY.paint("=>"),
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Cyan.paint(target_path.dirname_str().unwrap()),
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Cyan.paint("/"),
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file.file_colour().paint(file.name.as_slice())),
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},
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Err(filename) => Cell {
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length: 0, // ...because the rightmost column lengths are ignored!
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text: format!("{} {} {}",
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style.paint(name),
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Red.paint("=>"),
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Red.underline().paint(filename.as_slice())),
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},
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}
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Err(_) => displayed_name.to_string(),
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}
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Err(_) => Cell::paint(style, name),
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}
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}
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else {
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displayed_name.to_string()
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Cell::paint(style, name)
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}
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}
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@ -122,36 +145,35 @@ impl<'a> File<'a> {
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self.name.as_slice().width(false)
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}
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fn target_file_name_and_arrow(&self, target_path: &Path) -> String {
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/// Assuming the current file is a symlink, follows the link and
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/// returns a File object from the path the link points to.
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///
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/// If statting the file fails (usually because the file on the
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/// other end doesn't exist), returns the *filename* of the file
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/// that should be there.
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fn target_file(&self, target_path: &Path) -> Result<File, String> {
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let v = target_path.filename().unwrap();
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let filename = String::from_utf8_lossy(v);
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// Use stat instead of lstat - we *want* to follow links.
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let link_target = fs::stat(target_path).map(|stat| File {
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if let Ok(stat) = fs::stat(target_path) {
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Ok(File {
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path: target_path.clone(),
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dir: self.dir,
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stat: stat,
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name: filename.to_string(),
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ext: ext(filename.as_slice()),
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});
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// Statting a path usually fails because the file at the
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// other end doesn't exist. Show this by highlighting the
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// target file in red instead of displaying an error, because
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// the error would be shown out of context (before the
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// results, not right by the file) and it's almost always for
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// that reason anyway.
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match link_target {
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Ok(file) => format!("{} {}{}{}", GREY.paint("=>"), Cyan.paint(target_path.dirname_str().unwrap()), Cyan.paint("/"), file.file_colour().paint(filename.as_slice())),
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Err(_) => format!("{} {}", Red.paint("=>"), Red.underline().paint(filename.as_slice())),
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})
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}
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else {
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Err(filename.to_string())
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}
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}
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/// This file's number of hard links as a coloured string.
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fn hard_links(&self) -> String {
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fn hard_links(&self) -> Cell {
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let style = if self.has_multiple_links() { Red.on(Yellow) } else { Red.normal() };
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style.paint(self.stat.unstable.nlink.to_string().as_slice()).to_string()
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Cell::paint(style, &*self.stat.unstable.nlink.to_string())
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}
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/// Whether this is a regular file with more than one link.
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@ -164,17 +186,17 @@ impl<'a> File<'a> {
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}
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/// This file's inode as a coloured string.
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fn inode(&self) -> String {
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Purple.paint(self.stat.unstable.inode.to_string().as_slice()).to_string()
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fn inode(&self) -> Cell {
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Cell::paint(Purple.normal(), &*self.stat.unstable.inode.to_string())
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}
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/// This file's number of filesystem blocks (if available) as a coloured string.
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fn blocks(&self) -> String {
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fn blocks(&self) -> Cell {
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if self.stat.kind == io::FileType::RegularFile || self.stat.kind == io::FileType::Symlink {
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Cyan.paint(self.stat.unstable.blocks.to_string().as_slice()).to_string()
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Cell::paint(Cyan.normal(), &*self.stat.unstable.blocks.to_string())
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}
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else {
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GREY.paint("-").to_string()
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Cell { text: GREY.paint("-").to_string(), length: 1 }
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}
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}
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@ -183,7 +205,7 @@ impl<'a> File<'a> {
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/// If the user is not present, then it formats the uid as a number
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/// instead. This usually happens when a user is deleted, but still owns
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/// files.
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fn user<U: Users>(&self, users_cache: &mut U) -> String {
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fn user<U: Users>(&self, users_cache: &mut U) -> Cell {
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let uid = self.stat.unstable.uid as i32;
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let user_name = match users_cache.get_user_by_uid(uid) {
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@ -192,13 +214,13 @@ impl<'a> File<'a> {
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};
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let style = if users_cache.get_current_uid() == uid { Yellow.bold() } else { Plain };
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style.paint(user_name.as_slice()).to_string()
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Cell::paint(style, &*user_name)
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}
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/// This file's group name as a coloured string.
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///
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/// As above, if not present, it formats the gid as a number instead.
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fn group<U: Users>(&self, users_cache: &mut U) -> String {
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fn group<U: Users>(&self, users_cache: &mut U) -> Cell {
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let gid = self.stat.unstable.gid as u32;
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let mut style = Plain;
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@ -215,7 +237,7 @@ impl<'a> File<'a> {
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None => gid.to_string(),
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};
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style.paint(group_name.as_slice()).to_string()
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Cell::paint(style, &*group_name)
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}
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/// This file's size, formatted using the given way, as a coloured string.
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@ -224,22 +246,27 @@ impl<'a> File<'a> {
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/// some filesystems, I've never looked at one of those numbers and gained
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/// any information from it, so by emitting "-" instead, the table is less
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/// cluttered with numbers.
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fn file_size(&self, size_format: SizeFormat) -> String {
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fn file_size(&self, size_format: SizeFormat) -> Cell {
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if self.stat.kind == io::FileType::Directory {
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GREY.paint("-").to_string()
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Cell { text: GREY.paint("-").to_string(), length: 1 }
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}
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else {
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let result = match size_format {
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SizeFormat::DecimalBytes => decimal_prefix(self.stat.size as f64),
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SizeFormat::BinaryBytes => binary_prefix(self.stat.size as f64),
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SizeFormat::JustBytes => return Green.bold().paint(self.stat.size.to_string().as_slice()).to_string(),
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SizeFormat::JustBytes => return Cell::paint(Green.bold(), &*self.stat.size.to_string())
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};
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match result {
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Standalone(bytes) => Green.bold().paint(bytes.to_string().as_slice()).to_string(),
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Standalone(bytes) => Cell::paint(Green.bold(), &*bytes.to_string()),
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Prefixed(prefix, n) => {
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let number = if n < 10f64 { format!("{:.1}", n) } else { format!("{:.0}", n) };
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format!("{}{}", Green.bold().paint(number.as_slice()), Green.paint(prefix.symbol()))
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let symbol = prefix.symbol();
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Cell {
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text: format!("{}{}", Green.bold().paint(&*number), Green.paint(symbol)),
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length: number.len() + symbol.len(),
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}
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}
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}
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}
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@ -265,14 +292,14 @@ impl<'a> File<'a> {
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/// Each character is given its own colour. The first three permission
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/// bits are bold because they're the ones used most often, and executable
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/// files are underlined to make them stand out more.
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fn permissions_string(&self) -> String {
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fn permissions_string(&self) -> Cell {
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let bits = self.stat.perm;
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let executable_colour = match self.stat.kind {
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io::FileType::RegularFile => Green.bold().underline(),
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_ => Green.bold(),
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};
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return format!("{}{}{}{}{}{}{}{}{}{}",
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let string = format!("{}{}{}{}{}{}{}{}{}{}",
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self.type_char(),
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File::permission_bit(&bits, io::USER_READ, "r", Yellow.bold()),
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File::permission_bit(&bits, io::USER_WRITE, "w", Red.bold()),
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@ -284,6 +311,8 @@ impl<'a> File<'a> {
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File::permission_bit(&bits, io::OTHER_WRITE, "w", Red.normal()),
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File::permission_bit(&bits, io::OTHER_EXECUTE, "x", Green.normal()),
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);
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Cell { text: string, length: 10 }
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}
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/// Helper method for the permissions string.
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@ -1,13 +1,12 @@
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use std::cmp::max;
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use std::iter::{AdditiveIterator, repeat};
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use column::Column;
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use column::{Column, Cell};
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use column::Alignment::Left;
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use file::File;
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use users::OSUsers;
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use ansi_term::Style::Plain;
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use ansi_term::strip_formatting;
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#[derive(PartialEq, Show)]
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pub enum View {
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@ -29,7 +28,7 @@ impl View {
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/// The lines view literally just displays each file, line-by-line.
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fn lines_view(files: Vec<File>) {
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for file in files.iter() {
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println!("{}", file.file_name_view());
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println!("{}", file.file_name_view().text);
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}
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}
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@ -130,22 +129,16 @@ fn details_view(columns: &Vec<Column>, files: Vec<File>, header: bool) {
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let mut cache = OSUsers::empty_cache();
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let mut table: Vec<Vec<String>> = files.iter()
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let mut table: Vec<Vec<Cell>> = files.iter()
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.map(|f| columns.iter().map(|c| f.display(c, &mut cache)).collect())
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.collect();
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if header {
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table.insert(0, columns.iter().map(|c| Plain.underline().paint(c.header()).to_string()).collect());
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table.insert(0, columns.iter().map(|c| Cell::paint(Plain.underline(), c.header())).collect());
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}
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// Each column needs to have its invisible colour-formatting
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// characters stripped before it has its width calculated, or the
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// width will be incorrect and the columns won't line up properly.
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// This is fairly expensive to do (it uses a regex), so the
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// results are cached.
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let lengths: Vec<Vec<usize>> = table.iter()
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.map(|row| row.iter().map(|col| strip_formatting(col.as_slice()).len()).collect())
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.map(|row| row.iter().map(|c| c.length).collect())
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.collect();
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let column_widths: Vec<usize> = range(0, columns.len())
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@ -160,11 +153,11 @@ fn details_view(columns: &Vec<Column>, files: Vec<File>, header: bool) {
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if num == columns.len() - 1 {
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// The final column doesn't need to have trailing spaces
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print!("{}", row[num]);
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print!("{}", row[num].text);
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}
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else {
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let padding = column_widths[num] - field_widths[num];
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print!("{}", column.alignment().pad_string(&row[num], padding));
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print!("{}", column.alignment().pad_string(&row[num].text, padding));
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}
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}
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print!("\n");
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