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|
use std::io::BufRead;
use strip_ansi_escapes::strip;
use termion::event::Key;
use crate::files::File;
use crate::term::sized_string_u;
use crate::widget::{Widget, WidgetCore};
use crate::fail::{HResult, HError};
use crate::dirty::Dirtyable;
#[derive(Debug, PartialEq)]
pub struct TextView {
pub lines: Vec<String>,
pub core: WidgetCore,
pub follow: bool,
pub offset: usize,
file: Option<File>,
limited: bool,
}
impl TextView {
pub fn new_blank(core: &WidgetCore) -> TextView {
TextView {
lines: vec![],
core: core.clone(),
follow: false,
offset: 0,
file: None,
limited: false
}
}
pub fn new_from_file(core: &WidgetCore, file: &File) -> HResult<TextView> {
let mut view = TextView::new_from_file_limit_lines(core, file, 0)?;
view.limited = false;
Ok(view)
}
pub fn new_from_file_limit_lines(core: &WidgetCore,
file: &File,
num: usize) -> HResult<TextView> {
let buf = std::fs::File::open(&file.path)
.map(|f| std::io::BufReader::new(f))?;
let lines = buf.lines()
.enumerate()
.take_while(|(i, _)| num == 0 || i <= &num)
.map(|(_, l)| {
l.map_err(HError::from)
.and_then(|l| {
let l = strip(&l);
Ok(String::from_utf8_lossy(&l?).to_string())
})
.map_err(HError::from)
})
.collect::<HResult<_>>()?;
Ok(TextView {
lines: lines,
core: core.clone(),
follow: false,
offset: 0,
file: Some(file.clone()),
limited: true
})
}
pub fn set_text(&mut self, text: &str) -> HResult<()> {
let lines = text.lines().map(|l| l.to_string()).collect();
self.lines = lines;
self.limited = false;
self.file = None;
self.core.set_dirty();
self.refresh()
}
pub fn set_lines(&mut self, lines: Vec<String>) -> HResult<()> {
self.lines = lines;
self.limited = false;
self.file = None;
self.core.set_dirty();
self.refresh()
}
pub fn load_full(&mut self) {
if self.limited {
self.file
.as_ref()
.and_then(|f| {
TextView::new_from_file(&self.core, f).ok()
})
.map(|v| {
*self = v;
self.limited = false;
});
}
}
pub fn toggle_follow(&mut self) {
self.follow = !self.follow
}
pub fn scroll(&mut self, amount: isize) {
let ysize = self.get_coordinates().unwrap().ysize() as isize;
let offset = self.offset as isize;
let len = self.lines.len() as isize;
if len <= ysize + offset { return }
if amount > 0 {
if ysize + amount + offset + 1 >= len {
// Too far down
self.offset = (len - ysize - 1) as usize;
} else {
self.offset = (offset as isize + amount) as usize;
}
} else if amount < 0 {
if offset + amount >= 0 {
self.offset = (offset + amount) as usize;
} else {
self.offset = 0;
}
}
if offset != self.offset as isize {
self.core.set_dirty();
}
}
pub fn scroll_up(&mut self) {
self.scroll(-1);
}
pub fn scroll_down(&mut self) {
self.scroll(1);
}
pub fn page_up(&mut self) {
let ysize = self.get_coordinates().unwrap().ysize() as isize;
self.scroll(0 - ysize + 1);
}
pub fn page_down(&mut self) {
let ysize = self.get_coordinates().unwrap().ysize() as isize;
self.scroll(ysize - 1);
}
pub fn scroll_top(&mut self) {
self.offset = 0;
}
pub fn scroll_bottom(&mut self) {
let len = self.lines.len() as isize;
self.scroll(len);
}
}
impl Widget for TextView {
fn get_core(&self) -> HResult<&WidgetCore> {
Ok(&self.core)
}
fn get_core_mut(&mut self) -> HResult<&mut WidgetCore> {
Ok(&mut self.core)
}
fn refresh(&mut self) -> HResult<()> {
// let (xsize, ysize) = self.get_coordinates()?.size().size();
// let (xpos, ypos) = self.get_coordinates()?.position().position();
// let len = self.lines.len();
if self.follow {
self.scroll_bottom();
}
if self.core.is_dirty() {
self.core.set_clean();
}
Ok(())
}
fn get_drawlist(&self) -> HResult<String> {
let (xsize, ysize) = self.get_coordinates()?.size().size();
let (xpos, ypos) = self.get_coordinates()?.position().position();
let mut output = crate::term::reset();
output += &self.lines
.iter()
.skip(self.offset)
.take(ysize as usize)
.enumerate()
.map(|(i, line)| {
format!(
"{}{}",
crate::term::goto_xy(xpos, i as u16 + ypos),
sized_string_u(&line, (xsize-1) as usize))
})
.collect::<String>();
Ok(output)
}
fn render_footer(&self) -> HResult<String> {
let (xsize, ysize) = self.core.coordinates.size_u();
let (_, ypos) = self.core.coordinates.position_u();
let lines = self.lines
.len()
.saturating_sub(1);
let current_line_top = self.offset;
let current_line_bot = std::cmp::min(current_line_top + ysize + 1,
lines);
let line_hint = format!("{} - {} / {}",
current_line_top,
current_line_bot,
lines);
let hint_xpos = xsize - line_hint.len();
let hint_ypos = ysize + ypos + 1;
let footer = format!("{}{}",
crate::term::goto_xy_u(hint_xpos, hint_ypos),
line_hint);
Ok(footer)
}
fn on_key(&mut self, key: Key) -> HResult<()> {
self.do_key(key)
}
}
use crate::keybind::{Acting, Bindings, Movement};
impl Acting for TextView {
type Action=Movement;
fn search_in(&self) -> Bindings<Self::Action> {
Bindings::default()
}
fn movement(&mut self, movement: &Movement) -> HResult<
|
