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details.rs
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details.rs
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//! The **Details** output view displays each file as a row in a table.
//!
//! It’s used in the following situations:
//!
//! - Most commonly, when using the `--long` command-line argument to display the
//! details of each file, which requires using a table view to hold all the data;
//! - When using the `--tree` argument, which uses the same table view to display
//! each file on its own line, with the table providing the tree characters;
//! - When using both the `--long` and `--grid` arguments, which constructs a
//! series of tables to fit all the data on the screen.
//!
//! You will probably recognise it from the `ls --long` command. It looks like
//! this:
//!
//! ```text
//! .rw-r--r-- 9.6k ben 29 Jun 16:16 Cargo.lock
//! .rw-r--r-- 547 ben 23 Jun 10:54 Cargo.toml
//! .rw-r--r-- 1.1k ben 23 Nov 2014 LICENCE
//! .rw-r--r-- 2.5k ben 21 May 14:38 README.md
//! .rw-r--r-- 382k ben 8 Jun 21:00 screenshot.png
//! drwxr-xr-x - ben 29 Jun 14:50 src
//! drwxr-xr-x - ben 28 Jun 19:53 target
//! ```
//!
//! The table is constructed by creating a `Table` value, which produces a `Row`
//! value for each file. These rows can contain a vector of `Cell`s, or they can
//! contain depth information for the tree view, or both. These are described
//! below.
//!
//!
//! ## Constructing Detail Views
//!
//! When using the `--long` command-line argument, the details of each file are
//! displayed next to its name.
//!
//! The table holds a vector of all the column types. For each file and column, a
//! `Cell` value containing the ANSI-coloured text and Unicode width of each cell
//! is generated, with the row and column determined by indexing into both arrays.
//!
//! The column types vector does not actually include the filename. This is
//! because the filename is always the rightmost field, and as such, it does not
//! need to have its width queried or be padded with spaces.
//!
//! To illustrate the above:
//!
//! ```text
//! ┌─────────────────────────────────────────────────────────────────────────┐
//! │ columns: [ Permissions, Size, User, Date(Modified) ] │
//! ├─────────────────────────────────────────────────────────────────────────┤
//! │ rows: cells: filename: │
//! │ row 1: [ ".rw-r--r--", "9.6k", "ben", "29 Jun 16:16" ] Cargo.lock │
//! │ row 2: [ ".rw-r--r--", "547", "ben", "23 Jun 10:54" ] Cargo.toml │
//! │ row 3: [ "drwxr-xr-x", "-", "ben", "29 Jun 14:50" ] src │
//! │ row 4: [ "drwxr-xr-x", "-", "ben", "28 Jun 19:53" ] target │
//! └─────────────────────────────────────────────────────────────────────────┘
//! ```
//!
//! Each column in the table needs to be resized to fit its widest argument. This
//! means that we must wait until every row has been added to the table before it
//! can be displayed, in order to make sure that every column is wide enough.
use std::io::{self, Write};
use std::path::PathBuf;
use std::vec::IntoIter as VecIntoIter;
use ansiterm::Style;
use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
use log::*;
use crate::fs::dir_action::RecurseOptions;
use crate::fs::feature::git::GitCache;
use crate::fs::feature::xattr::Attribute;
use crate::fs::fields::SecurityContextType;
use crate::fs::filter::FileFilter;
use crate::fs::{Dir, File};
use crate::output::cell::TextCell;
use crate::output::color_scale::{ColorScaleInformation, ColorScaleOptions};
use crate::output::file_name::Options as FileStyle;
use crate::output::table::{Options as TableOptions, Row as TableRow, Table};
use crate::output::tree::{TreeDepth, TreeParams, TreeTrunk};
use crate::theme::Theme;
/// With the **Details** view, the output gets formatted into columns, with
/// each `Column` object showing some piece of information about the file,
/// such as its size, or its permissions.
///
/// To do this, the results have to be written to a table, instead of
/// displaying each file immediately. Then, the width of each column can be
/// calculated based on the individual results, and the fields are padded
/// during output.
///
/// Almost all the heavy lifting is done in a Table object, which handles the
/// columns for each row.
#[allow(clippy::struct_excessive_bools)]
/// This clearly isn't a state machine
#[derive(PartialEq, Eq, Debug)]
pub struct Options {
/// Options specific to drawing a table.
///
/// Directories themselves can pick which columns are *added* to this
/// list, such as the Git column.
pub table: Option<TableOptions>,
/// Whether to show a header line or not.
pub header: bool,
/// Whether to show each file’s extended attributes.
pub xattr: bool,
/// Whether to show each file's security attribute.
pub secattr: bool,
/// Whether to show a directory's mounted filesystem details
pub mounts: bool,
pub color_scale: ColorScaleOptions,
}
pub struct Render<'a> {
pub dir: Option<&'a Dir>,
pub files: Vec<File<'a>>,
pub theme: &'a Theme,
pub file_style: &'a FileStyle,
pub opts: &'a Options,
/// Whether to recurse through directories with a tree view, and if so,
/// which options to use. This field is only relevant here if the `tree`
/// field of the RecurseOptions is `true`.
pub recurse: Option<RecurseOptions>,
/// How to sort and filter the files after getting their details.
pub filter: &'a FileFilter,
/// Whether we are skipping Git-ignored files.
pub git_ignoring: bool,
pub git: Option<&'a GitCache>,
pub git_repos: bool,
}
#[rustfmt::skip]
struct Egg<'a> {
table_row: Option<TableRow>,
xattrs: &'a [Attribute],
errors: Vec<(io::Error, Option<PathBuf>)>,
dir: Option<Dir>,
file: &'a File<'a>,
}
impl<'a> AsRef<File<'a>> for Egg<'a> {
fn as_ref(&self) -> &File<'a> {
self.file
}
}
impl<'a> Render<'a> {
pub fn render<W: Write>(mut self, w: &mut W) -> io::Result<()> {
let mut rows = Vec::new();
let color_scale_info = ColorScaleInformation::from_color_scale(
self.opts.color_scale,
&self.files,
self.filter.dot_filter,
self.git,
self.git_ignoring,
self.recurse,
);
if let Some(ref table) = self.opts.table {
match (self.git, self.dir) {
(Some(g), Some(d)) => {
if !g.has_anything_for(&d.path) {
self.git = None;
}
}
(Some(g), None) => {
if !self.files.iter().any(|f| g.has_anything_for(&f.path)) {
self.git = None;
}
}
(None, _) => { /* Keep Git how it is */ }
}
let mut table = Table::new(table, self.git, self.theme, self.git_repos);
if self.opts.header {
let header = table.header_row();
table.add_widths(&header);
rows.push(self.render_header(header));
}
// This is weird, but I can’t find a way around it:
// https://internals.rust-lang.org/t/should-option-mut-t-implement-copy/3715/6
let mut table = Some(table);
self.add_files_to_table(
&mut table,
&mut rows,
&self.files,
TreeDepth::root(),
color_scale_info,
);
for row in self.iterate_with_table(table.unwrap(), rows) {
writeln!(w, "{}", row.strings())?;
}
} else {
self.add_files_to_table(
&mut None,
&mut rows,
&self.files,
TreeDepth::root(),
color_scale_info,
);
for row in self.iterate(rows) {
writeln!(w, "{}", row.strings())?;
}
}
Ok(())
}
/// Whether to show the extended attribute hint
pub fn show_xattr_hint(&self, file: &File<'_>) -> bool {
// Do not show the hint '@' if the only extended attribute is the security
// attribute and the security attribute column is active.
let xattr_count = file.extended_attributes().len();
let selinux_ctx_shown = self.opts.secattr
&& match file.security_context().context {
SecurityContextType::SELinux(_) => true,
SecurityContextType::None => false,
};
xattr_count > 1 || (xattr_count == 1 && !selinux_ctx_shown)
}
/// Adds files to the table, possibly recursively. This is easily
/// parallelisable, and uses a pool of threads.
fn add_files_to_table<'dir>(
&self,
table: &mut Option<Table<'a>>,
rows: &mut Vec<Row>,
src: &[File<'dir>],
depth: TreeDepth,
color_scale_info: Option<ColorScaleInformation>,
) {
use crate::fs::feature::xattr;
let mut file_eggs: Vec<_> = src
.par_iter()
.map(|file| {
let mut errors = Vec::new();
// There are three “levels” of extended attribute support:
//
// 1. If we’re compiling without that feature, then
// exa pretends all files have no attributes.
// 2. If the feature is enabled and the --extended flag
// has been specified, then display an @ in the
// permissions column for files with attributes, the
// names of all attributes and their values, and any
// errors encountered when getting them.
// 3. If the --extended flag *hasn’t* been specified, then
// display the @, but don’t display anything else.
//
// For a while, exa took a stricter approach to (3):
// if an error occurred while checking a file’s xattrs to
// see if it should display the @, exa would display that
// error even though the attributes weren’t actually being
// shown! This was confusing, as users were being shown
// errors for something they didn’t explicitly ask for,
// and just cluttered up the output. So now errors aren’t
// printed unless the user passes --extended to signify
// that they want to see them.
let xattrs: &[Attribute] = if xattr::ENABLED && self.opts.xattr {
file.extended_attributes()
} else {
&[]
};
let table_row = table
.as_ref()
.map(|t| t.row_for_file(file, self.show_xattr_hint(file), color_scale_info));
let mut dir = None;
if let Some(r) = self.recurse {
if file.is_directory() && r.tree && !r.is_too_deep(depth.0) {
trace!("matching on to_dir");
match file.to_dir() {
Ok(d) => {
dir = Some(d);
}
Err(e) => {
errors.push((e, None));
}
}
}
};
Egg {
table_row,
xattrs,
errors,
dir,
file,
}
})
.collect();
// this is safe because all entries have been initialized above
self.filter.sort_files(&mut file_eggs);
for (tree_params, egg) in depth.iterate_over(file_eggs.into_iter()) {
let mut files = Vec::new();
let mut errors = egg.errors;
if let (Some(ref mut t), Some(row)) = (table.as_mut(), egg.table_row.as_ref()) {
t.add_widths(row);
}
let file_name = self
.file_style
.for_file(egg.file, self.theme)
.with_link_paths()
.with_mount_details(self.opts.mounts)
.paint()
.promote();
let row = Row {
tree: tree_params,
cells: egg.table_row,
name: file_name,
};
rows.push(row);
if let Some(ref dir) = egg.dir {
for file_to_add in dir.files(
self.filter.dot_filter,
self.git,
self.git_ignoring,
egg.file.deref_links,
egg.file.is_recursive_size(),
) {
match file_to_add {
Ok(f) => {
files.push(f);
}
Err((path, e)) => {
errors.push((e, Some(path)));
}
}
}
self.filter.filter_child_files(&mut files);
if !files.is_empty() {
for xattr in egg.xattrs {
rows.push(self.render_xattr(xattr, TreeParams::new(depth.deeper(), false)));
}
for (error, path) in errors {
rows.push(self.render_error(
&error,
TreeParams::new(depth.deeper(), false),
path,
));
}
self.add_files_to_table(table, rows, &files, depth.deeper(), color_scale_info);
continue;
}
}
let count = egg.xattrs.len();
for (index, xattr) in egg.xattrs.iter().enumerate() {
let params =
TreeParams::new(depth.deeper(), errors.is_empty() && index == count - 1);
let r = self.render_xattr(xattr, params);
rows.push(r);
}
let count = errors.len();
for (index, (error, path)) in errors.into_iter().enumerate() {
let params = TreeParams::new(depth.deeper(), index == count - 1);
let r = self.render_error(&error, params, path);
rows.push(r);
}
}
}
pub fn render_header(&self, header: TableRow) -> Row {
Row {
tree: TreeParams::new(TreeDepth::root(), false),
cells: Some(header),
name: TextCell::paint_str(self.theme.ui.header, "Name"),
}
}
fn render_error(&self, error: &io::Error, tree: TreeParams, path: Option<PathBuf>) -> Row {
use crate::output::file_name::Colours;
let error_message = if let Some(path) = path {
format!("<{}: {}>", path.display(), error)
} else {
format!("<{error}>")
};
// TODO: broken_symlink() doesn’t quite seem like the right name for
// the style that’s being used here. Maybe split it in two?
let name = TextCell::paint(self.theme.broken_symlink(), error_message);
Row {
cells: None,
name,
tree,
}
}
fn render_xattr(&self, xattr: &Attribute, tree: TreeParams) -> Row {
let name = TextCell::paint(self.theme.ui.perms.attribute, format!("{xattr}"));
Row {
cells: None,
name,
tree,
}
}
pub fn iterate_with_table(&'a self, table: Table<'a>, rows: Vec<Row>) -> TableIter<'a> {
TableIter {
tree_trunk: TreeTrunk::default(),
total_width: table.widths().total(),
table,
inner: rows.into_iter(),
tree_style: self.theme.ui.punctuation,
}
}
pub fn iterate(&'a self, rows: Vec<Row>) -> Iter {
Iter {
tree_trunk: TreeTrunk::default(),
inner: rows.into_iter(),
tree_style: self.theme.ui.punctuation,
}
}
}
pub struct Row {
/// Vector of cells to display.
///
/// Most of the rows will be used to display files’ metadata, so this will
/// almost always be `Some`, containing a vector of cells. It will only be
/// `None` for a row displaying an attribute or error, neither of which
/// have cells.
pub cells: Option<TableRow>,
/// This file’s name, in coloured output. The name is treated separately
/// from the other cells, as it never requires padding.
pub name: TextCell,
/// Information used to determine which symbols to display in a tree.
pub tree: TreeParams,
}
#[rustfmt::skip]
pub struct TableIter<'a> {
inner: VecIntoIter<Row>,
table: Table<'a>,
total_width: usize,
tree_style: Style,
tree_trunk: TreeTrunk,
}
impl<'a> Iterator for TableIter<'a> {
type Item = TextCell;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next().map(|row| {
let mut cell = if let Some(cells) = row.cells {
self.table.render(cells)
} else {
let mut cell = TextCell::default();
cell.add_spaces(self.total_width);
cell
};
for tree_part in self.tree_trunk.new_row(row.tree) {
cell.push(self.tree_style.paint(tree_part.ascii_art()), 4);
}
// If any tree characters have been printed, then add an extra
// space, which makes the output look much better.
if !row.tree.is_at_root() {
cell.add_spaces(1);
}
cell.append(row.name);
cell
})
}
}
pub struct Iter {
tree_trunk: TreeTrunk,
tree_style: Style,
inner: VecIntoIter<Row>,
}
impl Iterator for Iter {
type Item = TextCell;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next().map(|row| {
let mut cell = TextCell::default();
for tree_part in self.tree_trunk.new_row(row.tree) {
cell.push(self.tree_style.paint(tree_part.ascii_art()), 4);
}
// If any tree characters have been printed, then add an extra
// space, which makes the output look much better.
if !row.tree.is_at_root() {
cell.add_spaces(1);
}
cell.append(row.name);
cell
})
}
}