mirror of
https://github.com/Llewellynvdm/exa.git
synced 2024-06-05 00:40:49 +00:00
a6ed42105d
Yeah, I forgot what I was meant to be doing half-way through. This also adds the row_threshold field, which disables the view unless there will be more than the given number of rows. Getting the row count required upgrading term_grid to a version that has that function added.
242 lines
7.9 KiB
Rust
242 lines
7.9 KiB
Rust
//! The grid-details view lists several details views side-by-side.
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use std::io::{Write, Result as IOResult};
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use ansi_term::ANSIStrings;
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use term_grid as grid;
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use fs::{Dir, File};
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use fs::feature::xattr::FileAttributes;
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use fs::filter::FileFilter;
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use output::cell::TextCell;
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use output::colours::Colours;
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use output::details::{Options as DetailsOptions, Row as DetailsRow, Render as DetailsRender};
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use output::grid::Options as GridOptions;
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use output::file_name::FileStyle;
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use output::table::{Table, Row as TableRow, Options as TableOptions};
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use output::tree::{TreeParams, TreeDepth};
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pub struct Render<'a> {
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/// The directory that’s being rendered here.
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/// We need this to know which columns to put in the output.
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pub dir: Option<&'a Dir>,
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/// The files that have been read from the directory. They should all
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/// hold a reference to it.
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pub files: Vec<File<'a>>,
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/// How to colour various pieces of text.
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pub colours: &'a Colours,
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/// How to format filenames.
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pub style: &'a FileStyle,
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/// The grid part of the grid-details view.
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pub grid: &'a GridOptions,
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/// The details part of the grid-details view.
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pub details: &'a DetailsOptions,
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/// How to filter files after listing a directory. The files in this
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/// render will already have been filtered and sorted, but any directories
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/// that we recurse into will have to have this applied.
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pub filter: &'a FileFilter,
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/// The minimum number of rows that there need to be before grid-details
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/// mode is activated.
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pub row_threshold: Option<usize>,
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}
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impl<'a> Render<'a> {
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/// Create a temporary Details render that gets used for the columns of
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/// the grid-details render that's being generated.
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///
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/// This includes an empty files vector because the files get added to
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/// the table in *this* file, not in details: we only want to insert every
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/// *n* files into each column’s table, not all of them.
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pub fn details(&self) -> DetailsRender<'a> {
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DetailsRender {
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dir: self.dir.clone(),
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files: Vec::new(),
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colours: self.colours,
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style: self.style,
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opts: self.details,
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recurse: None,
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filter: self.filter,
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}
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}
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/// Create a Details render for when this grid-details render doesn’t fit
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/// in the terminal (or something has gone wrong) and we have given up.
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pub fn give_up(self) -> DetailsRender<'a> {
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DetailsRender {
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dir: self.dir,
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files: self.files,
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colours: self.colours,
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style: self.style,
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opts: self.details,
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recurse: None,
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filter: &self.filter,
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}
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}
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pub fn render<W: Write>(self, w: &mut W) -> IOResult<()> {
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if let Some((grid, width)) = self.find_fitting_grid() {
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write!(w, "{}", grid.fit_into_columns(width))
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}
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else {
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self.give_up().render(w)
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}
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}
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pub fn find_fitting_grid(&self) -> Option<(grid::Grid, grid::Width)> {
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let options = self.details.table.as_ref().expect("Details table options not given!");
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let drender = self.details();
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let (first_table, _) = self.make_table(options, &drender);
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let rows = self.files.iter()
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.map(|file| first_table.row_for_file(file, file_has_xattrs(file)))
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.collect::<Vec<TableRow>>();
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let file_names = self.files.iter()
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.map(|file| self.style.for_file(file, self.colours).paint().promote())
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.collect::<Vec<TextCell>>();
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let mut last_working_table = self.make_grid(1, options, &file_names, rows.clone(), &drender);
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// If we can’t fit everything in a grid 100 columns wide, then
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// something has gone seriously awry
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for column_count in 2..100 {
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let grid = self.make_grid(column_count, options, &file_names, rows.clone(), &drender);
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let the_grid_fits = {
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let d = grid.fit_into_columns(column_count);
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d.is_complete() && d.width() <= self.grid.console_width
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};
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if the_grid_fits {
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last_working_table = grid;
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}
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else {
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// If we’ve figured out how many columns can fit in the user’s
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// terminal, and it turns out there aren’t enough rows to
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// make it worthwhile, then just resort to the lines view.
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if let Some(thresh) = self.row_threshold {
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if last_working_table.fit_into_columns(column_count - 1).row_count() < thresh {
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return None;
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}
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}
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return Some((last_working_table, column_count - 1));
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}
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}
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None
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}
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fn make_table<'t>(&'a self, options: &'a TableOptions, drender: &DetailsRender) -> (Table<'a>, Vec<DetailsRow>) {
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let mut table = Table::new(options, self.dir, self.colours);
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let mut rows = Vec::new();
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if self.details.header {
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let row = table.header_row();
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table.add_widths(&row);
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rows.push(drender.render_header(row));
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}
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(table, rows)
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}
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fn make_grid(&'a self, column_count: usize, options: &'a TableOptions, file_names: &[TextCell], rows: Vec<TableRow>, drender: &DetailsRender) -> grid::Grid {
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let mut tables = Vec::new();
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for _ in 0 .. column_count {
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tables.push(self.make_table(options, drender));
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}
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let mut num_cells = rows.len();
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if self.details.header {
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num_cells += column_count;
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}
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let original_height = divide_rounding_up(rows.len(), column_count);
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let height = divide_rounding_up(num_cells, column_count);
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for (i, (file_name, row)) in file_names.iter().zip(rows.into_iter()).enumerate() {
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let index = if self.grid.across {
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i % column_count
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}
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else {
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i / original_height
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};
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let (ref mut table, ref mut rows) = tables[index];
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table.add_widths(&row);
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let details_row = drender.render_file(row, file_name.clone(), TreeParams::new(TreeDepth::root(), false));
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rows.push(details_row);
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}
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let columns: Vec<_> = tables.into_iter().map(|(table, details_rows)| {
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drender.iterate_with_table(table, details_rows).collect::<Vec<_>>()
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}).collect();
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let direction = if self.grid.across { grid::Direction::LeftToRight }
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else { grid::Direction::TopToBottom };
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let mut grid = grid::Grid::new(grid::GridOptions {
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direction: direction,
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filling: grid::Filling::Spaces(4),
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});
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if self.grid.across {
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for row in 0 .. height {
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for column in &columns {
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if row < column.len() {
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let cell = grid::Cell {
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contents: ANSIStrings(&column[row].contents).to_string(),
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width: *column[row].width,
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};
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grid.add(cell);
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}
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}
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}
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}
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else {
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for column in &columns {
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for cell in column.iter() {
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let cell = grid::Cell {
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contents: ANSIStrings(&cell.contents).to_string(),
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width: *cell.width,
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};
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grid.add(cell);
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}
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}
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}
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grid
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}
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}
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fn divide_rounding_up(a: usize, b: usize) -> usize {
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let mut result = a / b;
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if a % b != 0 { result += 1; }
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result
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}
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fn file_has_xattrs(file: &File) -> bool {
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match file.path.attributes() {
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Ok(attrs) => !attrs.is_empty(),
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Err(_) => false,
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}
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}
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