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extern crate html2text;
#[cfg(unix)] extern crate termion;
#[cfg(unix)] extern crate argparse;
#[cfg(unix)] extern crate unicode_width;
#[cfg(unix)]
mod top {
use ::termion;
use ::std;
use ::html2text;
use std::io::{self, Write};
use std::collections::HashMap;
use html2text::render::text_renderer::{RichAnnotation,TaggedLine,TaggedLineElement};
use argparse::{ArgumentParser, Store};
use termion::input::TermRead;
use termion::event::Key;
use termion::raw::IntoRawMode;
use termion::cursor::Goto;
use termion::screen::AlternateScreen;
use unicode_width::UnicodeWidthStr;
fn to_style(tag: &Vec<RichAnnotation>) -> String {
let mut style = String::new();
for ann in tag {
match *ann {
RichAnnotation::Default => (),
RichAnnotation::Link(_) => {
style.push_str(&format!("{}", termion::style::Underline));
},
RichAnnotation::Image => {
style.push_str(&format!("{}", termion::color::Fg(termion::color::LightBlue)));
},
RichAnnotation::Emphasis => {
style.push_str(&format!("{}", termion::color::Fg(termion::color::LightGreen)));
},
RichAnnotation::Strong => {
style.push_str(&format!("{}", termion::color::Fg(termion::color::LightGreen)));
},
RichAnnotation::Code => {
style.push_str(&format!("{}", termion::color::Fg(termion::color::LightYellow)));
},
RichAnnotation::Preformat(_is_cont) => {
style.push_str(&format!("{}", termion::color::Fg(termion::color::LightBlack)));
},
}
}
style
}
struct LinkMap {
lines: Vec<Vec<Option<String>>>, // lines[y][x] => Some(URL) or None
}
impl LinkMap {
pub fn link_at(&self, x: usize, y: usize) -> Option<&str> {
if let Some(ref linevec) = self.lines.get(y) {
if let Some(&Some(ref text)) = linevec.get(x) {
return Some(&text)
}
}
None
}
}
fn link_from_tag(tag: &Vec<RichAnnotation>) -> Option<String> {
let mut link = None;
for annotation in tag {
if let RichAnnotation::Link(ref text) = *annotation {
link = Some(text.clone());
}
}
link
}
fn find_links(lines: &Vec<TaggedLine<Vec<RichAnnotation>>>) -> LinkMap {
use self::TaggedLineElement::Str;
let mut map = Vec::new();
for line in lines {
let mut linevec = Vec::new();
for tli in line.iter() {
if let Str(ts) = tli {
let link = link_from_tag(&ts.tag);
for _ in 0..UnicodeWidthStr::width(ts.s.as_str()) {
linevec.push(link.clone());
}
}
}
map.push(linevec);
}
LinkMap {
lines: map,
}
}
struct FragMap {
start_xy: HashMap<String, (usize,usize)>,
}
fn find_frags(lines: &Vec<TaggedLine<Vec<RichAnnotation>>>) -> FragMap {
use self::TaggedLineElement::*;
let mut map = HashMap::new();
let mut y = 0;
for line in lines {
let mut x = 0;
for tli in line.iter() {
match tli {
FragmentStart(fragname) => {
map.insert(fragname.to_string(), (x, y));
},
Str(ts) => {
x += UnicodeWidthStr::width(ts.s.as_str());
},
}
}
y += 1;
}
FragMap {
start_xy: map,
}
}
pub fn main() {
let mut filename = String::new();
{
let mut ap = ArgumentParser::new();
ap.refer(&mut filename)
.add_argument("filename", Store, "Set HTML filename");
ap.parse_args_or_exit();
}
let (width, height) = termion::terminal_size().unwrap();
let (width, height) = (width as usize, height as usize);
let mut file = std::fs::File::open(filename).expect("Tried to open file");
let annotated = html2text::from_read_rich(&mut file, width as usize);
let link_map = find_links(&annotated);
let frag_map = find_frags(&annotated);
let mut keys = io::stdin().keys();
// max_y is the largest (0-based) index of a real document line.
let max_y = annotated.len() - 1;
// top_y is the (0-based) index of the document line shown at
// the top of the visible screen.
let mut top_y = 0;
// doc_x and doc_y are the logical (0-based) x and y of the
// cursor position within the document.
let mut doc_x = 0;
let mut doc_y = 0;
let mut screen = AlternateScreen::from(
io::stdout().into_raw_mode().unwrap());
loop {
// Sanity-check the current screen position. max_y should
// be small enough that no blank lines beyond the end of
// the document are visible on screen (except when the
// document is shorter than a screenful); large enough
// that the cursor isn't off the bottom of the visible
// screen; and small enough that the cursor isn't off the
// top.
if max_y >= height-1 {
top_y = std::cmp::min(top_y, max_y - (height-1));
}
if doc_y >= height-1 {
top_y = std::cmp::max(top_y, doc_y - (height-1));
}
top_y = std::cmp::min(top_y, doc_y);
let opt_url = link_map.link_at(doc_x, doc_y);
let vis_y_limit = std::cmp::min(top_y + height, max_y + 1);
write!(screen, "{}", termion::clear::All).unwrap();
for (i, line) in annotated[top_y..vis_y_limit].iter().enumerate() {
use self::TaggedLineElement::Str;
write!(screen, "{}", Goto(1, i as u16 +1)).unwrap();
for tli in line.iter() {
if let Str(ts) = tli {
let style = to_style(&ts.tag);
let link = link_from_tag(&ts.tag);
match (opt_url, link) {
(Some(ref t1), Some(ref t2)) if t1 == t2 => {
write!(screen, "{}", termion::style::Invert).unwrap();
},
_ => (),
}
write!(screen, "{}{}{}", style, ts.s, termion::style::Reset).unwrap();
}
}
}
// 1-based screen coordinates
let cursor_x = (doc_x + 1) as u16;
let cursor_y = (doc_y - top_y + 1) as u16;
write!(screen, "{}", Goto(cursor_x, cursor_y)).unwrap();
screen.flush().unwrap();
if let Some(Ok(k)) = keys.next() {
match k {
Key::Char('q') => break,
Key::Char('j') | Key::Down => {
if doc_y < max_y {
doc_y += 1;
}
},
Key::Char('k') | Key::Up => {
if doc_y > 0 {
doc_y -= 1;
}
},
Key::Char('h') | Key::Left => {
if doc_x > 0 {
doc_x -= 1;
}
},
Key::Char('l') | Key::Right => {
if doc_x + 1 < width {
doc_x += 1;
}
},
Key::Char(' ') | Key::PageDown => {
// Ideally, move both the cursor and the top
// visible line down by a whole page
doc_y += height;
top_y += height;
// But bound the cursor within the document
doc_y = std::cmp::min(doc_y, max_y);
// And the standard bounds checking for top_y
// will take care of the rest of the special
// cases.
},
Key::PageUp => {
// Ideally, move both the cursor and the top
// visible line up by a whole page. But bound
// both at zero.
doc_y = std::cmp::max(doc_y, height) - height;
top_y = std::cmp::max(top_y, height) - height;
},
Key::Home => {
doc_y = 0;
},
Key::End => {
doc_y = max_y;
},
Key::Char('\t') => {
},
Key::Char('\r') | Key::Char('\n') => {
if let Some(url) = opt_url {
if url.starts_with("#") {
let start = frag_map.start_xy.get(&url[1..]);
if let Some((x, y)) = start {
doc_x = *x;
doc_y = *y;
}
}
}
},
_ => {},
}
}
}
}
}
#[cfg(not(unix))]
mod top {
pub fn main() {}
}
fn main() {
top::main()
}