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use crate::{InodeFilter, WalkOptions, WalkResult};
use failure::Error;
use filesize::PathExt;
use std::borrow::Cow;
use std::{fmt, io, path::Path};
use termion::color;
/// Aggregate the given `paths` and write information about them to `out` in a human-readable format.
/// If `compute_total` is set, it will write an additional line with the total size across all given `paths`.
/// If `sort_by_size_in_bytes` is set, we will sort all sizes (ascending) before outputting them.
pub fn aggregate(
mut out: impl io::Write,
options: WalkOptions,
compute_total: bool,
sort_by_size_in_bytes: bool,
paths: impl IntoIterator<Item = impl AsRef<Path>>,
) -> Result<(WalkResult, Statistics), Error> {
let mut res = WalkResult::default();
let mut stats = Statistics::default();
stats.smallest_file_in_bytes = u64::max_value();
let mut total = 0;
let mut num_roots = 0;
let mut aggregates = Vec::new();
let mut inodes = InodeFilter::default();
let paths: Vec<_> = paths.into_iter().collect();
for path in paths.into_iter() {
num_roots += 1;
let mut num_bytes = 0u64;
let mut num_errors = 0u64;
for entry in options.iter_from_path(path.as_ref()) {
stats.entries_traversed += 1;
match entry {
Ok(entry) => {
let file_size = match entry.client_state {
Some(Ok(ref m))
if !m.is_dir() && (options.count_hard_links || inodes.add(m)) =>
{
if options.apparent_size {
m.len()
} else {
entry.path().size_on_disk_fast(m).unwrap_or_else(|_| {
num_errors += 1;
0
})
}
}
Some(Ok(_)) => 0,
Some(Err(_)) => {
num_errors += 1;
0
}
None => unreachable!("must have populated client state for metadata"),
};
stats.largest_file_in_bytes = stats.largest_file_in_bytes.max(file_size);
stats.smallest_file_in_bytes = stats.smallest_file_in_bytes.min(file_size);
num_bytes += file_size;
}
Err(_) => num_errors += 1,
}
}
if sort_by_size_in_bytes {
aggregates.push((path.as_ref().to_owned(), num_bytes, num_errors));
} else {
write_path(
&mut out,
&options,
&path,
num_bytes,
num_errors,
path_color(&path),
)?;
}
total += num_bytes;
res.num_errors += num_errors;
}
if stats.entries_traversed == 0 {
stats.smallest_file_in_bytes = 0;
}
if sort_by_size_in_bytes {
aggregates.sort_by_key(|&(_, num_bytes, _)| num_bytes);
for (path, num_bytes, num_errors) in aggregates.into_iter() {
write_path(
&mut out,
&options,
&path,
num_bytes,
num_errors,
path_color(&path),
)?;
}
}
if num_roots > 1 && compute_total {
write_path(
&mut out,
&options,
Path::new("total"),
total,
res.num_errors,
color::Fg(color::Reset),
)?;
}
Ok((res, stats))
}
fn path_color(path: impl AsRef<Path>) -> Box<dyn fmt::Display> {
if path.as_ref().is_file() {
Box::new(color::Fg(color::LightBlack))
} else {
Box::new(color::Fg(color::Reset))
}
}
fn write_path<C: fmt::Display>(
out: &mut impl io::Write,
options: &WalkOptions,
path: impl AsRef<Path>,
num_bytes: u64,
num_errors: u64,
path_color: C,
) -> Result<(), io::Error> {
writeln!(
out,
"{byte_color}{:>byte_column_width$}{byte_color_reset} {path_color}{}{path_color_reset}{}",
options.byte_format.display(num_bytes).to_string(), // needed for formatting to work (unless we implement it ourselves)
path.as_ref().display(),
if num_errors == 0 {
Cow::Borrowed("")
} else {
Cow::Owned(format!(
" <{} IO Error{}>",
num_errors,
if num_errors > 1 { "s" } else { "" }
))
},
byte_color = options.color.display(color::Fg(color::Green)),
byte_color_reset = options.color.display(color::Fg(color::Reset)),
path_color = options.color.display(path_color),
path_color_reset = options.color.display(color::Fg(color::Reset)),
byte_column_width = options.byte_format.width()
)
}
/// Statistics obtained during a filesystem walk
#[derive(Default, Debug)]
pub struct Statistics {
/// The amount of entries we have seen during filesystem traversal
pub entries_traversed: u64,
/// The size of the smallest file encountered in bytes
pub smallest_file_in_bytes: u64,
/// The size of the largest file encountered in bytes
pub largest_file_in_bytes: u64,
}
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