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;
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use options::Options;
use unix::Unix;
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use ansi_term::{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),
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Ok(opts) => {
if opts.dirs.is_empty() {
exa(&opts, false, ".".to_string())
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}
else {
let mut first = true;
let print_header = opts.dirs.len() > 1;
for dir in opts.dirs.clone().move_iter() {
if first {
first = false;
}
else {
print!("\n");
}
exa(&opts, print_header, dir)
}
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}
}
};
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}
fn exa(options: &Options, print_header: bool, string: String) {
let path = Path::new(string.clone());
let dir = match Dir::readdir(path) {
Ok(dir) => dir,
Err(e) => {
println!("{}: {}", string, e);
return;
}
};
// Print header *after* readdir must have succeeded
if print_header {
println!("{}:", string);
}
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| options.columns.iter().map(|c| f.display(c, &mut cache)).collect())
.collect();
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if options.header {
table.unshift(options.columns.iter().map(|c| Plain.underline().paint(c.header())).collect());
}
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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();
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let column_widths: Vec<uint> = range(0, options.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()) {
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for (num, column) in options.columns.iter().enumerate() {
if num != 0 {
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print!(" ");
}
if num == options.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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}
}