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#![cfg_attr(docsrs, feature(doc_cfg))] //! A fast, asynchronous terminal paging library for Rust. `minus` provides high //! level functionalities to easily write a pager for any terminal application. //! Due to the asynchronous nature of `minus`, the pager's data can be //! **updated** (this needs the correct feature to be enabled). //! //! `minus` supports both [`tokio`] as well as [`async-std`] runtimes. What's //! more, if you only want to use `minus` for serving static output, you can //! simply opt out of these dynamic features, see the //! [**Features**](crate#features) section below. //! //! ## Why this crate ? //! //! `minus` was started by me for my work on [`pijul`]. I was unsatisfied with //! the existing options like [`pager`] and [`moins`]. //! //! * [`pager`]: //! * Only provides functions to join the standard output of the current //! program to the standard input of external pager like `more` or `less`. //! * Due to this, to work within Windows, the external pagers need to be //! packaged along with the executable. //! //! * [`moins`]: //! * The output could only be defined once and for all. It is not asynchronous //! and does not support updating. //! //! The main goals of `minus` are to be very compact and as configurable as possible. //! * `minus` provides a lot of configurablity to the end-application and this //! configuration can be defined not just in compile-time but also in **runtime.** Your //! entire configuration like the output displayed, prompt and line numbers are inside //! a `Arc<Mutex>`, which means at any time you can lock the configuration, change //! something, and voila minus will automatically update the screen //! //! * When using `minus`, you select what features you need and **nothing else**. See //! [Features](crate#features) below //! //! [`tokio`]: https://crates.io/crates/tokio //! [`async-std`]: https://crates.io/crates/async-std //! [`pager`]: https://crates.io/crates/pager //! [`moins`]: https://crates.io/crates/moins //! [`pijul`]: https://pijul.org/ //! //! ## Features //! //! * `async_std_lib`: Use this if you use [`async_std`] runtime in your //! application //! * `tokio_lib`:Use this if you are using [`tokio`] runtime for your application //! * `static_output`: Use this if you only want to use `minus` for displaying static //! output //! * `search`: If you want searching capablities inside the feature // When no feature is active this crate is unusable but contains lots of // unused imports and dead code. To avoid useless warnings about this they // are allowed when no feature is active. #![cfg_attr( not(any( feature = "tokio_lib", feature = "async_std_lib", feature = "static_output" )), allow(unused_imports), allow(dead_code) )] #![deny(clippy::all)] #![warn(clippy::pedantic)] pub mod error; mod init; pub mod input; #[cfg(any(feature = "tokio_lib", feature = "async_std_lib"))] mod rt_wrappers; #[cfg(feature = "search")] mod search; #[cfg(feature = "static_output")] mod static_pager; mod utils; #[cfg(any(feature = "tokio_lib", feature = "async_std_lib"))] use async_mutex::Mutex; use crossterm::{terminal, tty::IsTty}; use error::AlternateScreenPagingError; #[cfg(any(feature = "tokio_lib", feature = "async_std_lib"))] pub use rt_wrappers::*; #[cfg(feature = "search")] pub use search::SearchMode; #[cfg(feature = "static_output")] pub use static_pager::page_all; use std::{fmt, io::stdout}; use std::{iter::Flatten, string::ToString, vec::IntoIter}; pub use utils::LineNumbers; #[cfg(any(feature = "tokio_lib", feature = "async_std_lib"))] #[cfg_attr( docsrs, doc(cfg(any(feature = "tokio_lib", feature = "async_std_lib"))) )] /// A convinience tyoe for `std::sync::Arc<async_mutex::Mutex<Pager>>` pub type PagerMutex = std::sync::Arc<Mutex<Pager>>; /// A convinience type for `Vec<Box<dyn FnMut() + Send + Sync + 'static>>` pub type ExitCallbacks = Vec<Box<dyn FnMut() + Send + Sync + 'static>>; /// A struct containing basic configurations for the pager. This is used by /// all initializing functions /// /// ## Example /// You can use any async runtime, but we are taking the example of [`tokio`] ///```rust,no_run /// #[tokio::main] /// async fn main() -> Result<(), Box<dyn std::error::Error>> { /// use minus::{Pager, LineNumbers, tokio_updating}; /// let mut pager = Pager::new().unwrap(); /// pager.set_line_numbers(LineNumbers::AlwaysOn); /// pager.set_prompt("A complex configuration"); /// /// // Normally, you would use `futures::join` to join the pager and the text /// // updating function. We are doing this here to make the example simple /// tokio_updating(pager.finish()).await?; /// Ok(()) /// } ///``` /// /// For static output ///```rust,no_run /// fn main() -> Result<(), Box<dyn std::error::Error>> { /// let mut pager = minus::Pager::new().unwrap(); /// pager.set_text("Hello"); /// pager.set_prompt("Example"); /// minus::page_all(pager)?; /// Ok(()) /// } ///``` /// pub struct Pager { /// The output that is displayed /// Represented by a vector of lines where each line is a vector of strings /// split up on the basis of terminal width wrap_lines: Vec<Vec<String>>, /// Configuration for line numbers. See [`LineNumbers`] pub(crate) line_numbers: LineNumbers, /// The prompt displayed at the bottom prompt: String, /// Text which may have come through writeln that is unwraped lines: String, /// The input handler to be called when a input is found input_handler: Box<dyn input::InputHandler + Sync + Send>, /// Functions to run when the pager quits exit_callbacks: Vec<Box<dyn FnMut() + Send + Sync + 'static>>, /// The behaviour to do when user quits the program using `q` or `Ctrl+C` /// See [`ExitStrategy`] for available options exit_strategy: ExitStrategy, /// Whether the coming data is ended /// /// Applications should strictly call [Pager::end_data_stream()] once their stream /// of data to the pager is ended. end_stream: bool, /// Any warning or error to display to the user at the prompt /// The first element contains the actual message, while the second element tells /// whether the message has changed since the last display. message: (Option<String>, bool), /// The upper mark of scrolling. It is kept private to prevent end-applications /// from mutating this pub(crate) upper_mark: usize, /// Do we want to page if there;s no overflow pub(crate) run_no_overflow: bool, /// Stores the most recent search term #[cfg(feature = "search")] search_term: Option<regex::Regex>, // Direction of search #[cfg(feature = "search")] search_mode: SearchMode, /// Lines where searches have a match #[cfg(feature = "search")] pub(crate) search_idx: Vec<u16>, /// Rows of the terminal pub(crate) rows: usize, /// Columns of the terminal pub(crate) cols: usize, } impl Pager { /// Initialize a new pager configuration /// /// ## Errors /// This function will return an error if it cannot determine the terminal size /// /// # Example /// ``` /// let pager = minus::Pager::new().unwrap(); /// ``` pub fn new() -> Result<Self, error::AlternateScreenPagingError> { let (rows, cols); if cfg!(test) { // In tests, set these number of columns to 80 and rows to 10 cols = 80; rows = 10; } else if stdout().is_tty() { // If a proper terminal is present, get size and set it let size = terminal::size()?; cols = size.0; rows = size.1; } else { // For other cases beyond control cols = 1; rows = 1; }; Ok(Pager { wrap_lines: Vec::new(), line_numbers: LineNumbers::Disabled, upper_mark: 0, prompt: "minus".to_string(), exit_strategy: ExitStrategy::ProcessQuit, input_handler: Box::new(input::DefaultInputHandler {}), exit_callbacks: Vec::new(), run_no_overflow: false, message: (None, false), lines: String::new(), end_stream: false, #[cfg(feature = "search")] search_term: None, #[cfg(feature = "search")] search_mode: SearchMode::Unknown, #[cfg(feature = "search")] search_idx: Vec::new(), // Just to be safe in tests, keep at 1x1 size cols: cols as usize, rows: rows as usize, }) } /// Set the output text to this `t` /// /// Note that unlike [`Pager::push_str`], this replaces the original text. /// If you want to append text, use the [`Pager::push_str`] function /// /// Example /// ``` /// let mut pager = minus::Pager::new().unwrap(); /// pager.set_text("This is a line"); /// ``` pub fn set_text(&mut self, text: impl Into<String>) { let text: String = text.into(); // self.lines = WrappedLines::from(Line::from_str(&text.into(), self.cols)); self.wrap_lines = text.lines().map(|l| wrap_str(l, self.cols)).collect(); } /// Set line number to this setting /// /// Example /// ``` /// use minus::{Pager, LineNumbers}; /// /// let mut pager = Pager::new().unwrap(); /// pager.set_line_numbers(LineNumbers::Enabled); /// ``` pub fn set_line_numbers(&mut self, l: LineNumbers) { self.line_numbers = l; } /// Display a temporary message at the prompt area /// /// # Panics /// This function panics if the given text contains newline characters. /// This is because, the pager reserves only one line for showing the prompt /// and a newline will cause it to span multiple lines, breaking the display /// /// Example /// ``` /// use minus::Pager; /// /// let mut pager = Pager::new().unwrap(); /// pager.send_message("An error occurred"); /// ``` pub fn send_message(&mut self, text: impl Into<String>) { let message = text.into(); if message.contains('\n') { panic!("Prompt text cannot contain newlines") } self.message.0 = Some(message); self.message.1 = true; } /// Set the prompt displayed at the prompt to `t` /// /// # Panics /// This function panics if the given text contains newline characters. /// This is because, the pager reserves only one line for showing the prompt /// and a newline will cause it to span multiple lines, breaking the display /// /// Example /// ``` /// use minus::Pager; /// /// let mut pager = Pager::new().unwrap(); /// pager.set_prompt("my awesome program"); /// ``` pub fn set_prompt(&mut self, t: impl Into<String>) { let prompt = t.into(); if prompt.contains('\n') { panic!("Prompt text cannot contain newlines") } self.prompt = prompt; } /// Return a [`PagerMutex`] from this [`Pager`]. This is gated on `tokio_lib` or /// `async_std_lib` feature /// /// Example /// ``` /// use minus::Pager; /// /// let mut pager = Pager::new().unwrap(); /// pager.set_text("This output is paged"); /// let _pager_mutex = pager.finish(); /// ``` #[must_use] #[cfg(any(feature = "tokio_lib", feature = "async_std_lib"))] #[cfg_attr( docsrs, doc(cfg(any(feature = "tokio_lib", feature = "async_std_lib"))) )] pub fn finish(self) -> PagerMutex { std::sync::Arc::new(Mutex::new(self)) } /// Set the default exit strategy. /// /// This controls how the pager will behave when the user presses `q` or `Ctrl+C`. /// See [`ExitStrategy`] for available options /// /// ``` /// use minus::{Pager, ExitStrategy}; /// /// let mut pager = Pager::new().unwrap(); /// pager.set_exit_strategy(ExitStrategy::ProcessQuit); /// ``` pub fn set_exit_strategy(&mut self, strategy: ExitStrategy) { self.exit_strategy = strategy; } /// Returns the appropriate text for displaying. /// /// Nrmally it will return `self.lines` /// In case of a search, `self.search_lines` is returned pub(crate) fn get_lines(&self) -> Vec<Vec<String>> { self.wrap_lines.clone() } /// Set whether to display pager if there's less data than /// available screen height /// /// By default this is set to false /// /// ``` /// use minus::Pager; /// /// let mut pager = Pager::new().unwrap(); /// pager.set_run_no_overflow(true); /// ``` pub fn set_run_no_overflow(&mut self, value: bool) { self.run_no_overflow = value; } /// Appends text to the pager output /// /// This function will automatically split the lines, if they overflow /// the number of terminal columns /// /// ``` /// let mut pager = minus::Pager::new().unwrap(); /// pager.push_str("This is some text"); /// ``` pub fn push_str(&mut self, text: impl Into<String>) { let text: String = text.into(); text.lines() .for_each(|l| self.wrap_lines.push(wrap_str(l, self.cols))); } /// Hints the running pager that no more data is coming /// /// Example /// ``` /// use minus::Pager; /// /// let mut pager = Pager::new().unwrap(); /// pager.set_text("Hello from minus!"); /// pager.end_data_stream(); /// ``` pub fn end_data_stream(&mut self) { self.end_stream = true; } /// Readjust the text to new terminal size pub(crate) fn readjust_wraps(&mut self) { rewrap_lines(&mut self.wrap_lines, self.cols); } /// Returns all the text by flattening them into a single vector of strings pub(crate) fn get_flattened_lines(&self) -> Flatten<IntoIter<Vec<String>>> { self.get_lines().into_iter().flatten() } /// Returns the number of lines the [`Pager`] currently holds pub(crate) fn num_lines(&self) -> usize { self.get_flattened_lines().count() } /// Set custom input handler function /// /// See example in [`InputHandler`](input::InputHandler) on using this /// function pub fn set_input_handler(&mut self, handler: Box<dyn input::InputHandler + Send + Sync>) { self.input_handler = handler; } // Runs the exit callbacks pub(crate) fn exit(&mut self) { for func in &mut self.exit_callbacks { func(); } } /// Example /// ``` /// use minus::Pager; /// /// fn hello() { /// println!("Hello"); /// } /// /// let mut pager = Pager::new().unwrap(); /// pager.add_exit_callback(Box::new(hello)); /// ``` pub fn add_exit_callback(&mut self, cb: impl FnMut() + Send + Sync + 'static) { self.exit_callbacks.push(Box::new(cb)); } } impl std::default::Default for Pager { fn default() -> Self { Pager::new().unwrap() } } /// Behaviour that happens when the pager is exitted #[derive(PartialEq, Clone)] pub enum ExitStrategy { /// Kill the entire application immediately. /// /// This is the prefered option if paging is the last thing you do. For example, /// the last thing you do in your program is reading from a file or a database and /// paging it concurrently /// /// **This is the default strategy.** ProcessQuit, /// Kill the pager only. /// /// This is the prefered option if you want to do more stuff after exiting the pager. For example, /// if you've file system locks or you want to close database connectiions after /// the pager has done i's job, you probably want to go for this option PagerQuit, } /// Rewrap already wrapped vector of lines based on the number of columns pub(crate) fn rewrap_lines(lines: &mut Vec<Vec<String>>, cols: usize) { for line in lines { rewrap(line, cols); } } /// Rewrap a single line based on the number of columns pub(crate) fn rewrap(line: &mut Vec<String>, cols: usize) { *line = textwrap::wrap(&line.join(""), cols) .iter() .map(ToString::to_string) .collect(); } /// Wrap a line of string into a `Vec<String>` based on the number of columns pub(crate) fn wrap_str(line: &str, cols: usize) -> Vec<String> { textwrap::wrap(line, cols) .iter() .map(ToString::to_string) .collect::<Vec<String>>() } impl fmt::Write for Pager { fn write_str(&mut self, string: &str) -> fmt::Result { if string.ends_with('\n') { self.wrap_lines.append( &mut self .lines .lines() .map(|l| wrap_str(l, self.cols)) .collect::<Vec<Vec<String>>>(), ); self.lines.clear(); } else if string.contains('\n') { let mut lines = string.lines().collect::<Vec<&str>>(); let line_count = lines.len(); let push_lines = &mut lines[0..line_count - 1]; self.wrap_lines.append( &mut push_lines .iter() .map(|l| wrap_str(l, self.cols)) .collect::<Vec<Vec<String>>>(), ); self.lines.push_str(lines[line_count - 1]); } else { self.lines.push_str(string); } Ok(()) } } #[cfg(test)] mod tests;