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Use term_grid crate for grid formatting

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Fixes #39!
This commit is contained in:
Ben S 2015-06-23 10:54:57 +01:00
parent b235b64060
commit 8d6f62840a
4 changed files with 32 additions and 84 deletions
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9
Cargo.lock generated
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@ -13,6 +13,7 @@ dependencies = [
"num_cpus 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
"number_prefix 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
"pad 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
"term_grid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"threadpool 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
"unicode-width 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
"users 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@ -259,6 +260,14 @@ dependencies = [
"rand 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "term_grid"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"unicode-width 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "threadpool"
version = "0.1.4"

1
Cargo.toml
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@ -17,6 +17,7 @@ natord = "1.0.7"
num_cpus = "*"
number_prefix = "0.2.3"
pad = "0.1.1"
term_grid = "*"
threadpool = "*"
unicode-width = "*"
users = "0.4.0"

3
src/main.rs
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@ -1,5 +1,5 @@
#![feature(convert, fs_mode)]
#![feature(slice_extras, iter_arith, vec_resize)]
#![feature(slice_extras, vec_resize)]
extern crate ansi_term;
extern crate datetime;
@ -10,6 +10,7 @@ extern crate natord;
extern crate num_cpus;
extern crate number_prefix;
extern crate pad;
extern crate term_grid;
extern crate threadpool;
extern crate unicode_width;
extern crate users;

103
src/output/grid.rs
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@ -1,12 +1,8 @@
use std::cmp::max;
use std::iter::repeat;
use colours::Colours;
use column::Alignment::Left;
use file::File;
use filetype::file_colour;
use super::lines::Lines;
use term_grid as grid;
#[derive(PartialEq, Debug, Copy, Clone)]
@ -17,91 +13,32 @@ pub struct Grid {
}
impl Grid {
fn fit_into_grid(&self, files: &[File]) -> Option<(usize, Vec<usize>)> {
// TODO: this function could almost certainly be optimised...
// surely not *all* of the numbers of lines are worth searching through!
pub fn view(&self, files: &[File]) {
let direction = if self.across { grid::Direction::LeftToRight }
else { grid::Direction::TopToBottom };
// Instead of numbers of columns, try to find the fewest number of *lines*
// that the output will fit in.
for num_lines in 1 .. files.len() {
let mut grid = grid::Grid::new(grid::GridOptions {
direction: direction,
separator_width: 2,
});
// The number of columns is the number of files divided by the number
// of lines, *rounded up*.
let mut num_columns = files.len() / num_lines;
if files.len() % num_lines != 0 {
num_columns += 1;
}
grid.reserve(files.len());
// Early abort: if there are so many columns that the width of the
// *column separators* is bigger than the width of the screen, then
// don't even try to tabulate it.
// This is actually a necessary check, because the width is stored as
// a usize, and making it go negative makes it huge instead, but it
// also serves as a speed-up.
let separator_width = (num_columns - 1) * 2;
if self.console_width < separator_width {
continue;
}
// Remove the separator width from the available space.
let adjusted_width = self.console_width - separator_width;
// Find the width of each column by adding the lengths of the file
// names in that column up.
let mut column_widths: Vec<usize> = repeat(0).take(num_columns).collect();
for (index, file) in files.iter().enumerate() {
let index = if self.across {
index % num_columns
}
else {
index / num_lines
};
column_widths[index] = max(column_widths[index], file.file_name_width());
}
// If they all fit in the terminal, combined, then success!
if column_widths.iter().map(|&x| x).sum::<usize>() < adjusted_width {
return Some((num_lines, column_widths));
}
for file in files.iter() {
grid.add(grid::Cell {
contents: file_colour(&self.colours, file).paint(&file.name).to_string(),
width: file.file_name_width(),
});
}
// If you get here you have really long file names.
return None;
}
pub fn view(&self, files: &[File]) {
if let Some((num_lines, widths)) = self.fit_into_grid(files) {
for y in 0 .. num_lines {
for x in 0 .. widths.len() {
let num = if self.across {
y * widths.len() + x
}
else {
y + num_lines * x
};
// Show whitespace in the place of trailing files
if num >= files.len() {
continue;
}
let ref file = files[num];
let styled_name = file_colour(&self.colours, file).paint(&file.name).to_string();
if x == widths.len() - 1 {
// The final column doesn't need to have trailing spaces
print!("{}", styled_name);
}
else {
assert!(widths[x] >= file.file_name_width());
print!("{}", Left.pad_string(&styled_name, widths[x] - file.file_name_width() + 2));
}
}
print!("\n");
}
if let Some(display) = grid.fit_into_width(self.console_width) {
print!("{}", display);
}
else {
// Drop down to lines view if the file names are too big for a grid
Lines { colours: self.colours }.view(files);
// File names too long for a grid - drop down to just listing them!
for file in files.iter() {
println!("{}", file_colour(&self.colours, file).paint(&file.name));
}
}
}
}