exa/src/exa.rs

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Rust
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#![feature(phase)]
extern crate regex;
#[phase(plugin)] extern crate regex_macros;
extern crate ansi_term;
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use std::os;
use file::File;
use dir::Dir;
use column::{Column, Left};
use options::{Options, Lines, Grid};
use unix::Unix;
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use ansi_term::{Paint, Plain, strip_formatting};
pub mod column;
pub mod dir;
pub mod format;
pub mod file;
pub mod filetype;
pub mod unix;
pub mod options;
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pub mod sort;
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fn main() {
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let args = os::args();
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match Options::getopts(args) {
Err(err) => println!("Invalid options:\n{}", err),
Ok(opts) => exa(&opts),
};
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}
fn exa(opts: &Options) {
let mut first = true;
// It's only worth printing out directory names if the user supplied
// more than one of them.
let print_dir_names = opts.dirs.len() > 1;
for dir_name in opts.dirs.clone().move_iter() {
if first {
first = false;
}
else {
print!("\n");
}
match Dir::readdir(Path::new(dir_name.clone())) {
Ok(dir) => {
if print_dir_names { println!("{}:", dir_name); }
match opts.view {
Lines(ref cols) => lines_view(opts, cols, dir),
Grid => grid_view(opts, dir),
}
}
Err(e) => {
println!("{}: {}", dir_name, e);
return;
}
};
}
}
fn grid_view(options: &Options, dir: Dir) {
let unsorted_files = dir.files();
let files: Vec<&File> = options.transform_files(&unsorted_files);
let max_column_length = files.iter().map(|f| f.name.len()).max().unwrap();
let console_width = 80;
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let num_columns = (console_width + 1) / (max_column_length + 1);
let mut num_rows = files.len() / num_columns;
if files.len() % num_columns != 0 {
num_rows += 1;
}
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for y in range(0, num_rows) {
for x in range(0, num_columns) {
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if y * num_columns + x >= files.len() {
continue;
}
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let file = files.get(y * num_columns + x);
let file_name = file.name.clone();
let styled_name = file.file_colour().paint(file_name.as_slice());
print!("{}", Left.pad_string(&styled_name, max_column_length - file_name.len() + 1));
}
print!("\n");
}
}
fn lines_view(options: &Options, columns: &Vec<Column>, dir: Dir) {
let unsorted_files = dir.files();
let files: Vec<&File> = options.transform_files(&unsorted_files);
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// The output gets formatted into columns, which looks nicer. To
// do this, we have to write the results into a table, instead of
// displaying each file immediately, then calculating the maximum
// width of each column based on the length of the results and
// padding the fields during output.
let mut cache = Unix::empty_cache();
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let mut table: Vec<Vec<String>> = files.iter()
.map(|f| columns.iter().map(|c| f.display(c, &mut cache)).collect())
.collect();
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if options.header {
table.unshift(columns.iter().map(|c| Plain.underline().paint(c.header())).collect());
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}
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// Each column needs to have its invisible colour-formatting
// characters stripped before it has its width calculated, or the
// width will be incorrect and the columns won't line up properly.
// This is fairly expensive to do (it uses a regex), so the
// results are cached.
let lengths: Vec<Vec<uint>> = table.iter()
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.map(|row| row.iter().map(|col| strip_formatting(col.clone()).len()).collect())
.collect();
let column_widths: Vec<uint> = range(0, columns.len())
.map(|n| lengths.iter().map(|row| *row.get(n)).max().unwrap())
.collect();
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for (field_widths, row) in lengths.iter().zip(table.iter()) {
for (num, column) in columns.iter().enumerate() {
if num != 0 {
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print!(" ");
}
if num == columns.len() - 1 {
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print!("{}", row.get(num));
}
else {
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let padding = *column_widths.get(num) - *field_widths.get(num);
print!("{}", column.alignment().pad_string(row.get(num), padding));
}
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}
print!("\n");
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}
}