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Refactor utils into a module (#166)

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Vinícius Miguel 2021-11-05 22:04:00 -04:00 committed by GitHub
parent 5a53e5725e
commit 739a52f00e
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5 changed files with 255 additions and 234 deletions
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234
src/utils.rs
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//! Random stuff used on ouch.
use std::{
borrow::Cow,
cmp, env,
ffi::OsStr,
io,
path::{Component, Path, PathBuf},
};
use fs_err as fs;
use crate::{dialogs::Confirmation, info, Error};
/// Create the file if it doesn't exist and if it does then ask to overwrite it.
/// If the user doesn't want to overwrite then we return [`Ok(None)`]
pub fn create_or_ask_overwrite(path: &Path, question_policy: QuestionPolicy) -> Result<Option<fs::File>, Error> {
match fs::OpenOptions::new().write(true).create_new(true).open(path) {
Ok(w) => Ok(Some(w)),
Err(e) if e.kind() == io::ErrorKind::AlreadyExists => {
if user_wants_to_overwrite(path, question_policy)? {
if path.is_dir() {
// We can't just use `fs::File::create(&path)` because it would return io::ErrorKind::IsADirectory
// ToDo: Maybe we should emphasise that `path` is a directory and everything inside it will be gone?
fs::remove_dir_all(path)?;
}
Ok(Some(fs::File::create(path)?))
} else {
Ok(None)
}
}
Err(e) => Err(Error::from(e)),
}
}
/// Checks given path points to an empty directory.
pub fn dir_is_empty(dir_path: &Path) -> bool {
let is_empty = |mut rd: std::fs::ReadDir| rd.next().is_none();
dir_path.read_dir().map(is_empty).unwrap_or_default()
}
/// Creates the dir if non existent.
pub fn create_dir_if_non_existent(path: &Path) -> crate::Result<()> {
if !path.exists() {
fs::create_dir_all(path)?;
info!("directory {} created.", to_utf(path));
}
Ok(())
}
/// Removes the current dir from the beginning of a path
/// normally used for presentation sake.
/// If this function fails, it will return source path as a PathBuf.
pub fn strip_cur_dir(source_path: &Path) -> PathBuf {
source_path
.strip_prefix(Component::CurDir)
.map(|path| path.to_path_buf())
.unwrap_or_else(|_| source_path.to_path_buf())
}
/// Returns current directory, but before change the process' directory to the
/// one that contains the file pointed to by `filename`.
pub fn cd_into_same_dir_as(filename: &Path) -> crate::Result<PathBuf> {
let previous_location = env::current_dir()?;
let parent = filename.parent().ok_or(crate::Error::CompressingRootFolder)?;
env::set_current_dir(parent)?;
Ok(previous_location)
}
/// Check if QuestionPolicy flags were set, otherwise, ask user if they want to overwrite.
pub fn user_wants_to_overwrite(path: &Path, question_policy: QuestionPolicy) -> crate::Result<bool> {
match question_policy {
QuestionPolicy::AlwaysYes => Ok(true),
QuestionPolicy::AlwaysNo => Ok(false),
QuestionPolicy::Ask => {
let path = to_utf(strip_cur_dir(path));
let path = Some(path.as_str());
let placeholder = Some("FILE");
Confirmation::new("Do you want to overwrite 'FILE'?", placeholder).ask(path)
}
}
}
/// Converts an OsStr to utf8 with custom formatting.
///
/// This is different from [`Path::display`].
///
/// See https://gist.github.com/marcospb19/ebce5572be26397cf08bbd0fd3b65ac1 for a comparison.
pub fn to_utf(os_str: impl AsRef<OsStr>) -> String {
let text = format!("{:?}", os_str.as_ref());
text.trim_matches('"').to_string()
}
/// Converts a slice of AsRef<OsStr> to comma separated String
///
/// Panics if the slice is empty.
pub fn concatenate_list_of_os_str(os_strs: &[impl AsRef<OsStr>]) -> String {
let mut iter = os_strs.iter().map(AsRef::as_ref);
let mut string = to_utf(iter.next().unwrap()); // May panic
for os_str in iter {
string += ", ";
string += &to_utf(os_str);
}
string
}
/// Display the directory name, but change to "current directory" when necessary.
pub fn nice_directory_display(os_str: impl AsRef<OsStr>) -> Cow<'static, str> {
if os_str.as_ref() == "." {
Cow::Borrowed("current directory")
} else {
let text = to_utf(os_str);
Cow::Owned(format!("'{}'", text))
}
}
/// Module with a list of bright colors.
#[allow(dead_code)]
pub mod colors {
use once_cell::sync::Lazy;
static DISABLE_COLORED_TEXT: Lazy<bool> = Lazy::new(|| {
std::env::var_os("NO_COLOR").is_some() || atty::isnt(atty::Stream::Stdout) || atty::isnt(atty::Stream::Stderr)
});
macro_rules! color {
($name:ident = $value:literal) => {
#[cfg(target_family = "unix")]
/// Inserts color onto text based on configuration
pub static $name: Lazy<&str> = Lazy::new(|| if *DISABLE_COLORED_TEXT { "" } else { $value });
#[cfg(not(target_family = "unix"))]
pub static $name: &&str = &"";
};
}
color!(RESET = "\u{1b}[39m");
color!(BLACK = "\u{1b}[38;5;8m");
color!(BLUE = "\u{1b}[38;5;12m");
color!(CYAN = "\u{1b}[38;5;14m");
color!(GREEN = "\u{1b}[38;5;10m");
color!(MAGENTA = "\u{1b}[38;5;13m");
color!(RED = "\u{1b}[38;5;9m");
color!(WHITE = "\u{1b}[38;5;15m");
color!(YELLOW = "\u{1b}[38;5;11m");
color!(STYLE_BOLD = "\u{1b}[1m");
color!(STYLE_RESET = "\u{1b}[0m");
color!(ALL_RESET = "\u{1b}[0;39m");
}
/// Struct useful to printing bytes as kB, MB, GB, etc.
pub struct Bytes {
bytes: f64,
}
impl Bytes {
const UNIT_PREFIXES: [&'static str; 6] = ["", "k", "M", "G", "T", "P"];
/// Create a new Bytes.
pub fn new(bytes: u64) -> Self {
Self { bytes: bytes as f64 }
}
}
impl std::fmt::Display for Bytes {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let num = self.bytes;
debug_assert!(num >= 0.0);
if num < 1_f64 {
return write!(f, "{} B", num);
}
let delimiter = 1000_f64;
let exponent = cmp::min((num.ln() / 6.90775).floor() as i32, 4);
write!(f, "{:.2} ", num / delimiter.powi(exponent))?;
write!(f, "{}B", Bytes::UNIT_PREFIXES[exponent as usize])
}
}
#[derive(Debug, PartialEq, Clone, Copy)]
/// Determines if overwrite questions should be skipped or asked to the user
pub enum QuestionPolicy {
/// Ask the user every time
Ask,
/// Set by `--yes`, will say 'Y' to all overwrite questions
AlwaysYes,
/// Set by `--no`, will say 'N' to all overwrite questions
AlwaysNo,
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_pretty_bytes_formatting() {
fn format_bytes(bytes: u64) -> String {
format!("{}", Bytes::new(bytes))
}
let b = 1;
let kb = b * 1000;
let mb = kb * 1000;
let gb = mb * 1000;
assert_eq!("0 B", format_bytes(0)); // This is weird
assert_eq!("1.00 B", format_bytes(b));
assert_eq!("999.00 B", format_bytes(b * 999));
assert_eq!("12.00 MB", format_bytes(mb * 12));
assert_eq!("123.00 MB", format_bytes(mb * 123));
assert_eq!("5.50 MB", format_bytes(mb * 5 + kb * 500));
assert_eq!("7.54 GB", format_bytes(gb * 7 + 540 * mb));
assert_eq!("1.20 TB", format_bytes(gb * 1200));
// bytes
assert_eq!("234.00 B", format_bytes(234));
assert_eq!("999.00 B", format_bytes(999));
// kilobytes
assert_eq!("2.23 kB", format_bytes(2234));
assert_eq!("62.50 kB", format_bytes(62500));
assert_eq!("329.99 kB", format_bytes(329990));
// megabytes
assert_eq!("2.75 MB", format_bytes(2750000));
assert_eq!("55.00 MB", format_bytes(55000000));
assert_eq!("987.65 MB", format_bytes(987654321));
// gigabytes
assert_eq!("5.28 GB", format_bytes(5280000000));
assert_eq!("95.20 GB", format_bytes(95200000000));
assert_eq!("302.00 GB", format_bytes(302000000000));
}
}

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use std::cmp;
/// Struct useful to printing bytes as kB, MB, GB, etc.
pub struct Bytes {
bytes: f64,
}
impl Bytes {
const UNIT_PREFIXES: [&'static str; 6] = ["", "k", "M", "G", "T", "P"];
/// Create a new Bytes.
pub fn new(bytes: u64) -> Self {
Self { bytes: bytes as f64 }
}
}
impl std::fmt::Display for Bytes {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let num = self.bytes;
debug_assert!(num >= 0.0);
if num < 1_f64 {
return write!(f, "{} B", num);
}
let delimiter = 1000_f64;
let exponent = cmp::min((num.ln() / 6.90775).floor() as i32, 4);
write!(f, "{:.2} ", num / delimiter.powi(exponent))?;
write!(f, "{}B", Bytes::UNIT_PREFIXES[exponent as usize])
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_pretty_bytes_formatting() {
fn format_bytes(bytes: u64) -> String {
format!("{}", Bytes::new(bytes))
}
let b = 1;
let kb = b * 1000;
let mb = kb * 1000;
let gb = mb * 1000;
assert_eq!("0 B", format_bytes(0)); // This is weird
assert_eq!("1.00 B", format_bytes(b));
assert_eq!("999.00 B", format_bytes(b * 999));
assert_eq!("12.00 MB", format_bytes(mb * 12));
assert_eq!("123.00 MB", format_bytes(mb * 123));
assert_eq!("5.50 MB", format_bytes(mb * 5 + kb * 500));
assert_eq!("7.54 GB", format_bytes(gb * 7 + 540 * mb));
assert_eq!("1.20 TB", format_bytes(gb * 1200));
// bytes
assert_eq!("234.00 B", format_bytes(234));
assert_eq!("999.00 B", format_bytes(999));
// kilobytes
assert_eq!("2.23 kB", format_bytes(2234));
assert_eq!("62.50 kB", format_bytes(62500));
assert_eq!("329.99 kB", format_bytes(329990));
// megabytes
assert_eq!("2.75 MB", format_bytes(2750000));
assert_eq!("55.00 MB", format_bytes(55000000));
assert_eq!("987.65 MB", format_bytes(987654321));
// gigabytes
assert_eq!("5.28 GB", format_bytes(5280000000));
assert_eq!("95.20 GB", format_bytes(95200000000));
assert_eq!("302.00 GB", format_bytes(302000000000));
}
}

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//! Random filesystem-related stuff used on ouch.
use std::{
borrow::Cow,
env,
ffi::OsStr,
path::{Component, Path, PathBuf},
};
use fs_err as fs;
use crate::info;
/// Checks given path points to an empty directory.
pub fn dir_is_empty(dir_path: &Path) -> bool {
let is_empty = |mut rd: std::fs::ReadDir| rd.next().is_none();
dir_path.read_dir().map(is_empty).unwrap_or_default()
}
/// Creates the dir if non existent.
pub fn create_dir_if_non_existent(path: &Path) -> crate::Result<()> {
if !path.exists() {
fs::create_dir_all(path)?;
info!("directory {} created.", to_utf(path));
}
Ok(())
}
/// Removes the current dir from the beginning of a path
/// normally used for presentation sake.
/// If this function fails, it will return source path as a PathBuf.
pub fn strip_cur_dir(source_path: &Path) -> PathBuf {
source_path
.strip_prefix(Component::CurDir)
.map(|path| path.to_path_buf())
.unwrap_or_else(|_| source_path.to_path_buf())
}
/// Returns current directory, but before change the process' directory to the
/// one that contains the file pointed to by `filename`.
pub fn cd_into_same_dir_as(filename: &Path) -> crate::Result<PathBuf> {
let previous_location = env::current_dir()?;
let parent = filename.parent().ok_or(crate::Error::CompressingRootFolder)?;
env::set_current_dir(parent)?;
Ok(previous_location)
}
/// Converts an OsStr to utf8 with custom formatting.
///
/// This is different from [`Path::display`].
///
/// See for a comparison.
pub fn to_utf(os_str: impl AsRef<OsStr>) -> String {
let text = format!("{:?}", os_str.as_ref());
text.trim_matches('"').to_string()
}
/// Converts a slice of AsRef<OsStr> to comma separated String
///
/// Panics if the slice is empty.
pub fn concatenate_list_of_os_str(os_strs: &[impl AsRef<OsStr>]) -> String {
let mut iter = os_strs.iter().map(AsRef::as_ref);
let mut string = to_utf(iter.next().unwrap()); // May panic
for os_str in iter {
string += ", ";
string += &to_utf(os_str);
}
string
}
/// Display the directory name, but change to "current directory" when necessary.
pub fn nice_directory_display(os_str: impl AsRef<OsStr>) -> Cow<'static, str> {
if os_str.as_ref() == "." {
Cow::Borrowed("current directory")
} else {
let text = to_utf(os_str);
Cow::Owned(format!("'{}'", text))
}
}
/// Module with a list of bright colors.
#[allow(dead_code)]
pub mod colors {
use once_cell::sync::Lazy;
static DISABLE_COLORED_TEXT: Lazy<bool> = Lazy::new(|| {
std::env::var_os("NO_COLOR").is_some() || atty::isnt(atty::Stream::Stdout) || atty::isnt(atty::Stream::Stderr)
});
macro_rules! color {
($name:ident = $value:literal) => {
#[cfg(target_family = "unix")]
/// Inserts color onto text based on configuration
pub static $name: Lazy<&str> = Lazy::new(|| if *DISABLE_COLORED_TEXT { "" } else { $value });
#[cfg(not(target_family = "unix"))]
pub static $name: &&str = &"";
};
}
color!(RESET = "\u{1b}[39m");
color!(BLACK = "\u{1b}[38;5;8m");
color!(BLUE = "\u{1b}[38;5;12m");
color!(CYAN = "\u{1b}[38;5;14m");
color!(GREEN = "\u{1b}[38;5;10m");
color!(MAGENTA = "\u{1b}[38;5;13m");
color!(RED = "\u{1b}[38;5;9m");
color!(WHITE = "\u{1b}[38;5;15m");
color!(YELLOW = "\u{1b}[38;5;11m");
color!(STYLE_BOLD = "\u{1b}[1m");
color!(STYLE_RESET = "\u{1b}[0m");
color!(ALL_RESET = "\u{1b}[0;39m");
}

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src/utils/mod.rs Normal file
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//! Random filesystem-related stuff used on ouch.
mod bytes;
mod fs;
mod question_policy;
pub use bytes::Bytes;
pub use fs::{
cd_into_same_dir_as, colors, concatenate_list_of_os_str, create_dir_if_non_existent, dir_is_empty,
nice_directory_display, strip_cur_dir, to_utf,
};
pub use question_policy::{create_or_ask_overwrite, user_wants_to_overwrite, QuestionPolicy};

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src/utils/question_policy.rs Normal file
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use std::path::Path;
use fs_err as fs;
use super::{strip_cur_dir, to_utf};
use crate::{
dialogs::Confirmation,
error::{Error, Result},
};
#[derive(Debug, PartialEq, Clone, Copy)]
/// Determines if overwrite questions should be skipped or asked to the user
pub enum QuestionPolicy {
/// Ask the user every time
Ask,
/// Set by `--yes`, will say 'Y' to all overwrite questions
AlwaysYes,
/// Set by `--no`, will say 'N' to all overwrite questions
AlwaysNo,
}
/// Check if QuestionPolicy flags were set, otherwise, ask user if they want to overwrite.
pub fn user_wants_to_overwrite(path: &Path, question_policy: QuestionPolicy) -> crate::Result<bool> {
match question_policy {
QuestionPolicy::AlwaysYes => Ok(true),
QuestionPolicy::AlwaysNo => Ok(false),
QuestionPolicy::Ask => {
let path = to_utf(strip_cur_dir(path));
let path = Some(path.as_str());
let placeholder = Some("FILE");
Confirmation::new("Do you want to overwrite 'FILE'?", placeholder).ask(path)
}
}
}
/// Create the file if it doesn't exist and if it does then ask to overwrite it.
/// If the user doesn't want to overwrite then we return [`Ok(None)`]
pub fn create_or_ask_overwrite(path: &Path, question_policy: QuestionPolicy) -> Result<Option<fs::File>> {
match fs::OpenOptions::new().write(true).create_new(true).open(path) {
Ok(w) => Ok(Some(w)),
Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => {
if user_wants_to_overwrite(path, question_policy)? {
if path.is_dir() {
// We can't just use `fs::File::create(&path)` because it would return io::ErrorKind::IsADirectory
// ToDo: Maybe we should emphasise that `path` is a directory and everything inside it will be gone?
fs::remove_dir_all(path)?;
}
Ok(Some(fs::File::create(path)?))
} else {
Ok(None)
}
}
Err(e) => Err(Error::from(e)),
}
}