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360 lines
8.6 KiB
360 lines
8.6 KiB
///! Progress bar that has a size and also a max size.
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use super::*;
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use std::{
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fmt::Write,
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io,
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};
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/// A progress bar with a size and optionally title. It implements the `ProgressBar` trait, and is the default progress bar.
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///
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/// The bar has a max size, that is usually derived from the size of your terminal (if it can be detected) or can be set yourself, to stop the title line going over the side.
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/// It also has a configurable width, which is defaulted to 50.
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///
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/// # Usage
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///
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/// To create a new `progress::Bar` with a max size tuned to your terminal (or `Width+20`, if it cannot be detected), and of the default size, `Bar` implements the `Default` trait:
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/// ```rust
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/// # use termprogress::prelude::*;
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/// let mut bar = Bar::default(); //Creates a bar of width 50 by default.
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/// ```
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///
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/// You can configure sizes and initial title with `new()`, `with_title()`, and `with_max()` functions.
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/// # How it looks
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/// It renders in the terminal like:
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/// `[========================= ]: 50% this is a title that may get cut if it reaches max le...`
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#[derive(Debug)]
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pub struct Bar<T: ?Sized = io::Stdout> //TODO: Implement this after try_new(), WINCH, etc
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{
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width: usize,
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max_width: usize,
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progress: f64,
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buffer: String,
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title: String,
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#[cfg(feature="size")]
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fit_to_term: bool,
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output: T
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}
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/// The default size of the terminal bar when the programmer does not provide her own.
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/// Or if `size` is not used.
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pub const DEFAULT_SIZE: usize = 50;
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/// The default size of the max render bar when the programmer does not provide her own.
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/// Or if `size` is not used.
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pub const DEFAULT_MAX_BORDER_SIZE: usize = 20;
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impl<T: Default> Default for Bar<T>
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{
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#[inline]
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fn default() -> Self
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{
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Self::new(T::default(), DEFAULT_SIZE)
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}
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}
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impl<T> Bar<T>
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{
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/// Create a new bar `width` long with a title.
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pub fn with_title(output: impl Into<T>, width: usize, title: impl AsRef<str>) -> Self
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{
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let mut this = Self::new(output, width);
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this.set_title(title.as_ref());
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this.update();
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this
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}
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#[inline] fn add_title(&mut self, title: &str)
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{
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self.set_title(title);
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self.update()
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}
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/// Attempt to create a new bar with max display width of our terminal and a title.
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///
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/// If `stdout` is not a terminal, then `None` is returned.
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#[cfg(feature="size")]
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pub fn try_new_with_title(output: impl Into<T>, width: usize, title: impl AsRef<str>) -> Option<Self>
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{
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let (terminal_size::Width(tw), _) = terminal_size::terminal_size()?;
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let tw = usize::from(tw);
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let mut o = Self::with_max(output.into(), if width < tw {width} else {tw}, tw);
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o.set_title(title.as_ref());
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o.fit_to_term = true;
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o.update();
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Some(o)
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}
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#[inline]
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fn autofit(&mut self)
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{
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#[cfg(feature="size")]
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self.fit();
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}
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/// Create a new bar with max display width of our terminal
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///
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/// # Notes
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/// Without feature `size`, will be the same as `Self::with_max(width, width +20)`
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///
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/// To try to create one that always adheres to `size`, use the `try_new()` family of functions.
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#[cfg_attr(not(feature="size"), inline)]
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pub fn new(output: impl Into<T>, width: usize) -> Self
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{
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#[cfg(feature="size")]
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return {
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if let Some((terminal_size::Width(tw), _)) = terminal_size::terminal_size() {
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let tw = usize::from(tw);
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let mut o = Self::with_max(output.into(), if width < tw {width} else {tw}, tw);
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o.fit_to_term = true;
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o
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} else {
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let mut o = Self::with_max(output.into(), width, width + DEFAULT_MAX_BORDER_SIZE);
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o.fit_to_term = true;
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o
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}
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};
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#[cfg(not(feature="size"))]
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return {
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Self::with_max(output.into(), width, width +DEFAULT_MAX_BORDER_SIZE)
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};
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}
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/// Attempt to create a new bar with max display width of our terminal.
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///
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/// If `stdout` is not a terminal, then `None` is returned.
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#[cfg(feature="size")]
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pub fn try_new(output: impl Into<T>, width: usize) -> Option<Self>
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{
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let (terminal_size::Width(tw), _) = terminal_size::terminal_size()?;
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let tw = usize::from(tw);
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let mut o = Self::with_max(output, if width < tw {width} else {tw}, tw);
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o.fit_to_term = true;
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Some(o)
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}
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/// Attempt to create a new bar with max display width of our terminal.
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///
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/// If `stdout` is not a terminal, then `None` is returned.
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#[cfg(feature="size")]
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#[inline]
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pub fn try_new_default_size(to: impl Into<T>) -> Option<Self>
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{
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Self::try_new(to, DEFAULT_SIZE)
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}
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/// Create a bar with a max display width
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///
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/// # Panics
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/// If `width` is larger than or equal to `max_width`.
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pub fn with_max(output: T, width: usize, max_width: usize) -> Self
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{
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let mut this = Self {
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width,
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max_width,
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progress: 0.0,
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buffer: String::with_capacity(width),
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title: String::with_capacity(max_width - width),
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#[cfg(feature="size")]
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fit_to_term: false,
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output
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};
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this.update();
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this
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}
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}
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impl<T: ?Sized> Bar<T> {
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/// Fit to terminal's width if possible.
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///
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/// # Notes
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/// Available with feature `size` only.
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pub fn fit(&mut self) -> bool
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{
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#[cfg(feature="size")]
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if let Some((terminal_size::Width(tw), _)) = terminal_size::terminal_size() {
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let tw = usize::from(tw);
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self.width = if self.width < tw {self.width} else {tw};
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self.update_dimensions(tw);
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return true;
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}
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false
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}
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#[inline] fn widths(&self) -> (usize, usize)
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{
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#[cfg(feature="size")]
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if self.fit_to_term {
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if let Some((terminal_size::Width(tw), _)) = terminal_size::terminal_size() {
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let tw = usize::from(tw);
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let width = if self.width < tw {self.width} else {tw};
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return (width, tw);
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}
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};
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(self.width, self.max_width)
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}
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/// Update the buffer.
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pub fn update(&mut self)
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{
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self.buffer.clear();
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let pct = (self.progress * (self.width as f64)) as usize;
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for i in 0..self.width
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{
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if i >= pct {
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write!(self.buffer, " ").unwrap();
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} else {
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write!(self.buffer, "=").unwrap();
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}
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}
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}
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/// Consume the bar and complete it, regardless of progress.
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pub fn complete(self)
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{
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println!("");
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}
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}
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fn ensure_eq(input: String, to: usize) -> String
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{
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let chars = input.chars();
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if chars.count() != to {
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let mut chars = input.chars();
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let mut output = String::with_capacity(to);
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for _ in 0..to
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{
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if let Some(c) = chars.next() {
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write!(output, "{}", c).unwrap();
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} else {
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write!(output, " ").unwrap();
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}
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}
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output
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} else {
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input
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}
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}
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fn ensure_lower(input: String, to: usize) -> String
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{
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let chars = input.chars();
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if chars.count() > to
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{
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let chars = input.chars();
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let mut output = String::with_capacity(to);
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for (i,c) in (0..).zip(chars)
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{
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write!(output, "{}", c).unwrap();
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if to>3 && i == to-3 {
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write!(output, "...").unwrap();
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break;
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} else if i==to {
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break;
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}
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}
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output
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} else {
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input
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}
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}
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impl<T: ?Sized + io::Write> Display for Bar<T>
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{
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fn refresh(&self)
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{
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let (_, max_width) = self.widths();
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let temp = format!("[{}]: {:.2}%", self.buffer, self.progress * 100.00);
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let title = ensure_lower(format!(" {}", self.title), max_width - temp.chars().count());
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let temp = ensure_eq(format!("{}{}", temp, title), max_width);
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print!("\x1B[0m\x1B[K{}", temp);
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print!("\n\x1B[1A");
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flush!();
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}
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fn blank(&self)
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{
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let (_, max_width) = self.widths();
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print!("\r{}\r", " ".repeat(max_width));
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flush!();
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}
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fn get_title(&self) -> &str
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{
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&self.title
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}
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fn set_title(&mut self, from: &str)
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{
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self.title = from.to_string();
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self.refresh();
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}
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fn update_dimensions(&mut self, to: usize)
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{
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self.max_width = to;
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self.refresh();
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}
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}
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impl<T: ?Sized + io::Write> ProgressBar for Bar<T>
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{
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fn get_progress(&self) -> f64
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{
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self.progress
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}
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fn set_progress(&mut self, value: f64)
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{
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if self.progress != value {
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self.progress = value;
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self.update();
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}
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self.refresh();
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}
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}
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impl<T: io::Write> WithTitle for Bar<T>
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{
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fn add_title(&mut self, string: impl AsRef<str>)
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{
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(*self).add_title(string.as_ref())
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}
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fn update(&mut self)
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{
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self.update();
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}
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fn complete(self)
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{
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self.complete();
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}
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}
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const _:() = {
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const fn declval<T>() -> Bar<T> {
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unreachable!()
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}
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fn take_title(_: &(impl WithTitle + ?Sized)) {}
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fn take_progress(_: &(impl ProgressBar + ?Sized)) {}
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fn take_display(_: &(impl Display + ?Sized)) {}
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fn test()
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{
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#[macro_export] macro_rules! assert_is_bar {
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($ty:path) => {
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take_title(&declval::<$ty>());
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take_progress(&declval::<$ty>());
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take_display(&declval::<$ty>());
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}
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}
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assert_is_bar!(io::Stdout);
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assert_is_bar!(std::fs::File);
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}
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};
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