1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175

//! [![version](https://img.shields.io/crates/v/circle-rs)](https:://github.com/alekspickle)
//! 
//! # Minimalistic modern infinite terminal progress indicator
//! 
//! This is slightly changed version of [rustbar](https://crates.io/crates/rustbar) crate, which is simple and minimalistic,
//! but i needed another infinite bar animation, hence this crate.
//! 
//! ### The goal also was to be able to use it as simple as:
//! 
//! # Example 
//! ```rust,no_run
//! #use std::{io::Result, thread, time::Duration};
//! 
//! #use wait_lib::{Infinite, Progress};
//! pub fn main() -> Result<()> {
//!     println!("\nGoing to poll some stuff.");
//!     let mut loader = Infinite::new().to_stderr();
//!     loader.set_msg("Polling");
//!     loader.start()?;
//!     thread::sleep(Duration::from_secs(2));
//!     loader.stop()?;
//!     Ok(())
//! }
//! ```
//! # Features:
//! 1. set custom loading message
//! 2. set loader speed without reconstructing it
//! 
use std::{
    io::{stderr, stdout, Result, Write},
    thread,
    time::Duration,
};

/// loader pattern
const PATTERN: &str = "⠁⠁⠂⠂⠄⠄⡀⡀⡀⠠⠠⠐⠐⠈";

fn clear_stdout() -> Result<()> {
    stdout().flush()?;
    Ok(())
}

fn write_to_stdout(buf: String) -> Result<()> {
    let mut output = stdout();
    output.write(buf.as_bytes())?;
    output.flush()?;
    Ok(())
}

fn write_to_stderr(buf: String) -> Result<()> {
    let mut output = stderr();
    output.write(buf.as_bytes())?;
    output.flush()?;
    Ok(())
}

/// Main trait
pub trait Progress<T> {
    fn new() -> T;
    fn to_stderr(&mut self) -> T;
    fn write(&self, buf: String) -> Result<()>;
    fn clear(&self) -> Result<()>;
}

/// Struct for storing state
#[derive(Clone)]
pub struct Infinite {
    msg: String,
    marker_position: u8,
    step: u8,
    delay: Duration,
    write_fn: fn(String) -> Result<()>,
    clear_fn: fn() -> Result<()>,
    rolling: bool,
}

impl Default for Infinite {
    fn default() -> Infinite {
        Infinite {
            step: 1,
            delay: Duration::from_millis(100),
            msg: "".to_owned(),
            marker_position: 0,
            write_fn: write_to_stdout,
            clear_fn: clear_stdout,
            rolling: false,
        }
    }
}

impl Progress<Infinite> for Infinite {
    fn new() -> Infinite {
        Infinite {
            ..Default::default()
        }
    }

    fn to_stderr(&mut self) -> Infinite {
        self.write_fn = write_to_stderr;
        self.clone()
    }

    fn write(&self, buf: String) -> Result<()> {
        (self.write_fn)(buf)?;
        Ok(())
    }
    fn clear(&self) -> Result<()> {
        (self.clear_fn)()?;
        Ok(())
    }
}

impl Infinite {
    pub fn set_msg(&mut self, msg: &str) {
        self.msg = msg.to_owned()
    }
    pub fn set_delay(&mut self, d: Duration) {
        self.delay = d
    }

    pub fn get_msg(&self) -> &str {
        self.msg.as_ref()
    }
    pub fn get_delay(&self) -> Duration {
        self.delay
    }

    pub fn stop(&mut self) -> Result<()> {
        self.rolling = false;
        self.clear()?;
        self.render_end()?;
        Ok(())
    }
    pub fn start<'a>(&'a mut self) -> Result<String> {
        self.rolling = true;
        let mut bar = self.clone();
        let sleep = self.delay;
        let thread_name = "rolling";
        thread::Builder::new()
        .name(thread_name.clone().into())
        .spawn(move || loop {
            bar.render().unwrap();
                thread::sleep(sleep);
            })?;
        
        Ok(thread_name.into())
    }

    pub fn render_end(&mut self) -> Result<()> {
         self.write("\r".into())
    }
    pub fn render(&mut self) -> Result<()> {
        if self.marker_position == 0 {
            self.marker_position = 0;
            self.step = 1;
        } else if self.marker_position == 12 {
            self.marker_position = 0;
            self.step = 1;
        }
        self.marker_position = self.marker_position + self.step;

        let bar = PATTERN
            .chars()
            .nth(usize::from(self.marker_position))
            .expect("out of bounds");

        self.write(format!(
            "\r{msg} {bar}{bar}{bar} ",
            msg = self.msg,
            bar = bar
        ))?;
        Ok(())
    }
}