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-rw-r--r--src/epub.rs35
-rw-r--r--src/main.rs207
2 files changed, 140 insertions, 102 deletions
diff --git a/src/epub.rs b/src/epub.rs
index 508e6b1..f80e2bc 100644
--- a/src/epub.rs
+++ b/src/epub.rs
@@ -7,7 +7,7 @@ use roxmltree::{Document, Node};
pub struct Epub {
container: zip::ZipArchive<File>,
pub nav: Vec<String>,
- pub pages: Vec<Vec<String>>,
+ pub chapters: Vec<String>,
}
impl Epub {
@@ -16,55 +16,57 @@ impl Epub {
let mut epub = Epub {
container: zip::ZipArchive::new(file)?,
nav: Vec::new(),
- pages: Vec::new(),
+ chapters: Vec::new(),
};
let nav = epub.get_nav();
epub.nav.reserve_exact(nav.len());
- epub.pages.reserve_exact(nav.len());
+ epub.chapters.reserve_exact(nav.len());
for (path, label) in nav {
epub.nav.push(label);
let xml = epub.get_text(&path);
+ // https://github.com/RazrFalcon/roxmltree/issues/12
+ // UnknownEntityReference for HTML entities
let doc = Document::parse(&xml).unwrap();
let body = doc.root_element().last_element_child().unwrap();
- let mut page = Vec::new();
- Epub::render(&mut page, body);
- epub.pages.push(page);
+ // XXX no initial string, buf.last is none
+ let mut chapter = String::new();
+ Epub::render(&mut chapter, body);
+ epub.chapters.push(chapter);
}
Ok(epub)
}
- fn render(buf: &mut Vec<String>, n: Node) {
+ fn render(buf: &mut String, n: Node) {
if n.is_text() {
let text = n.text().unwrap();
if !text.trim().is_empty() {
- let last = buf.last_mut().unwrap();
- last.push_str(text);
+ buf.push_str(text);
}
return;
}
match n.tag_name().name() {
"h1" | "h2" | "h3" | "h4" | "h5" | "h6" => {
- buf.push(String::from("\x1b\x5b1m"));
+ buf.push_str("\n\x1b\x5b1m");
for c in n.children() {
Self::render(buf, c);
}
- buf.push(String::from("\x1b\x5b0m"));
+ buf.push_str("\x1b\x5b0m\n");
}
"blockquote" | "p" => {
- buf.push(String::new());
+ buf.push('\n');
for c in n.children() {
Self::render(buf, c);
}
- buf.push(String::new());
+ buf.push('\n');
}
"li" => {
- buf.push(String::from("- "));
+ buf.push_str("\n- ");
for c in n.children() {
Self::render(buf, c);
}
- buf.push(String::new());
+ buf.push('\n');
}
- "br" => buf.push(String::new()),
+ "br" => buf.push('\n'),
_ => {
for c in n.children() {
Self::render(buf, c);
@@ -106,7 +108,6 @@ impl Epub {
manifest.insert(n.attribute("id").unwrap(), n.attribute("href").unwrap());
});
- // TODO check if epub3 nav is reliable w/o spine
let mut nav = HashMap::new();
if doc.root_element().attribute("version") == Some("3.0") {
let path = doc
diff --git a/src/main.rs b/src/main.rs
index 6a87411..c050d1b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,47 +11,55 @@ use crossterm::{
mod epub;
use epub::Epub;
-fn wrap(text: &String, width: u16) -> Vec<String> {
+fn wrap(text: &str, width: usize) -> Vec<(usize, String)> {
// XXX assumes a char is 1 unit wide
- let mut wrapped = Vec::new();
+ let mut lines = Vec::new();
let mut start = 0;
- let mut brk = 0;
- let mut line = 0;
+ let mut end = 0;
+ let mut len = 0;
let mut word = 0;
let mut skip = 0;
for (i, c) in text.char_indices() {
+ len += 1;
match c {
' ' => {
- brk = i;
+ end = i;
skip = 1;
word = 0;
}
- // https://www.unicode.org/reports/tr14/
- // https://en.wikipedia.org/wiki/Line_wrap_and_word_wrap
- // currently only break at hyphen and em-dash :shrug:
'-' | '—' => {
- brk = i + c.len_utf8();
- skip = 0;
- word = 0;
+ if len > width {
+ // `end = i + 1` will extend over the margin
+ word += 1;
+ } else {
+ end = i + c.len_utf8();
+ skip = 0;
+ word = 0;
+ }
}
_ => {
word += 1;
}
}
-
- if line == width {
- wrapped.push(String::from(&text[start..brk]));
- start = brk + skip;
- line = word;
- } else {
- line += 1;
+ if c == '\n' {
+ lines.push((start, String::from(&text[start..i])));
+ start = i + 1;
+ len = 0;
+ } else if len > width {
+ let line = if word == len {
+ &text[start..i]
+ } else {
+ &text[start..end]
+ };
+ lines.push((start, String::from(line)));
+ start = end + skip;
+ len = word;
}
}
- wrapped.push(String::from(&text[start..]));
- wrapped
+ lines
}
struct Position(String, usize, usize);
@@ -104,8 +112,8 @@ impl View for Nav {
bk.view = Some(&Page);
}
KeyCode::Enter | KeyCode::Tab | KeyCode::Right | KeyCode::Char('l') => {
- bk.get_chapter(bk.nav_idx);
- bk.pos = 0;
+ bk.chapter = bk.nav_idx;
+ bk.line = 0;
bk.view = Some(&Page);
}
KeyCode::Down | KeyCode::Char('j') => {
@@ -158,25 +166,28 @@ impl View for Page {
match kc {
KeyCode::Esc | KeyCode::Char('q') => bk.view = None,
KeyCode::Tab => {
- bk.nav_idx = bk.chapter_idx;
+ bk.nav_idx = bk.chapter;
bk.nav_top = bk.nav_idx.saturating_sub(bk.rows - 1);
bk.view = Some(&Nav);
}
KeyCode::F(1) | KeyCode::Char('?') => bk.view = Some(&Help),
KeyCode::Char('/') => {
bk.search = String::new();
+ bk.jump = bk.line;
bk.view = Some(&Search);
}
KeyCode::Char('N') => {
bk.search(Direction::Backward);
}
KeyCode::Char('n') => {
+ // FIXME
+ bk.scroll_down(1);
bk.search(Direction::Forward);
}
KeyCode::End | KeyCode::Char('G') => {
- bk.pos = (bk.chapter.len() / bk.rows) * bk.rows;
+ bk.line = bk.lines().len().saturating_sub(bk.rows);
}
- KeyCode::Home | KeyCode::Char('g') => bk.pos = 0,
+ KeyCode::Home | KeyCode::Char('g') => bk.line = 0,
KeyCode::Char('d') => {
bk.scroll_down(bk.rows / 2);
}
@@ -205,8 +216,8 @@ impl View for Page {
}
}
fn render(&self, bk: &Bk) -> Vec<String> {
- let end = std::cmp::min(bk.pos + bk.rows, bk.chapter.len());
- bk.chapter[bk.pos..end].iter().map(String::from).collect()
+ let end = std::cmp::min(bk.line + bk.rows, bk.lines().len());
+ bk.lines()[bk.line..end].iter().map(String::from).collect()
}
}
@@ -215,7 +226,7 @@ impl View for Search {
fn run(&self, bk: &mut Bk, kc: KeyCode) {
match kc {
KeyCode::Esc => {
- bk.search = String::new();
+ bk.line = bk.jump;
bk.view = Some(&Page);
}
KeyCode::Enter => {
@@ -223,6 +234,7 @@ impl View for Search {
}
KeyCode::Backspace => {
bk.search.pop();
+ bk.search(Direction::Forward);
}
KeyCode::Char(c) => {
bk.search.push(c);
@@ -232,10 +244,10 @@ impl View for Search {
}
}
fn render(&self, bk: &Bk) -> Vec<String> {
- let end = std::cmp::min(bk.pos + bk.rows - 1, bk.chapter.len());
+ let end = std::cmp::min(bk.line + bk.rows - 1, bk.lines().len());
let mut buf = Vec::with_capacity(bk.rows);
- for line in bk.chapter[bk.pos..end].iter() {
+ for line in bk.lines()[bk.line..end].iter() {
if let Some(i) = line.find(&bk.search) {
buf.push(format!(
"{}{}{}{}{}",
@@ -258,40 +270,62 @@ impl View for Search {
}
}
+struct Chapter {
+ text: String,
+ lines: Vec<String>,
+ bytes: Vec<usize>,
+}
+
struct Bk<'a> {
view: Option<&'a dyn View>,
- pages: Vec<Vec<String>>,
+ chapter: usize,
cols: u16,
- chapter: Vec<String>,
- chapter_idx: usize,
+ // ideally we could use string slices as pointers, but self referential structs are hard
+ chapters: Vec<Chapter>,
nav_idx: usize,
nav_top: usize,
- pos: usize,
+ line: usize,
+ jump: usize,
rows: usize,
toc: Vec<String>,
- pad: u16,
+ max_width: u16,
search: String,
}
impl Bk<'_> {
- fn new(epub: Epub, pos: &Position, pad: u16) -> Self {
+ fn new(epub: Epub, line: &Position, max_width: u16) -> Self {
let (cols, rows) = terminal::size().unwrap();
- let mut bk = Bk {
+ let width = std::cmp::min(cols, max_width) as usize;
+ let mut chapters = Vec::with_capacity(epub.chapters.len());
+ for text in epub.chapters {
+ let wrap = wrap(&text, width);
+ let mut lines = Vec::with_capacity(wrap.len());
+ let mut bytes = Vec::with_capacity(wrap.len());
+
+ for (byte, line) in wrap {
+ lines.push(line);
+ bytes.push(byte);
+ }
+ chapters.push(Chapter {text, lines, bytes});
+ }
+
+ Bk {
+ jump: 0,
view: Some(&Page),
- chapter: Vec::new(),
- chapter_idx: 0,
+ chapter: line.1,
nav_idx: 0,
nav_top: 0,
toc: epub.nav,
- pages: epub.pages,
- pos: pos.2,
- pad,
+ chapters,
+ line: line.2,
+ max_width,
cols,
rows: rows as usize,
search: String::new(),
- };
- bk.get_chapter(pos.1);
- bk
+ }
+ }
+ fn lines(&self) -> &Vec<String> {
+ &self.chapters[self.chapter].lines
}
fn run(&mut self) -> crossterm::Result<()> {
let mut stdout = stdout();
@@ -299,20 +333,18 @@ impl Bk<'_> {
terminal::enable_raw_mode()?;
while let Some(view) = self.view {
+ let pad = self.cols.saturating_sub(self.max_width) / 2;
+
queue!(stdout, terminal::Clear(terminal::ClearType::All))?;
for (i, line) in view.render(self).iter().enumerate() {
- queue!(stdout, cursor::MoveTo(self.pad, i as u16), Print(line))?;
+ queue!(stdout, cursor::MoveTo(pad, i as u16), Print(line))?;
}
stdout.flush().unwrap();
match event::read()? {
Event::Key(e) => view.run(self, e.code),
- Event::Resize(cols, rows) => {
- self.cols = cols;
- self.rows = rows as usize;
- self.get_chapter(self.chapter_idx);
- }
// TODO
+ Event::Resize(_, _) => (),
Event::Mouse(_) => (),
}
}
@@ -320,58 +352,63 @@ impl Bk<'_> {
queue!(stdout, terminal::LeaveAlternateScreen, cursor::Show)?;
terminal::disable_raw_mode()
}
- fn get_chapter(&mut self, idx: usize) {
- let width = self.cols - (self.pad * 2);
- let page = &self.pages[idx];
- self.chapter = Vec::with_capacity(page.len() * 2);
- for line in page {
- self.chapter.append(&mut wrap(line, width))
- }
- self.chapter_idx = idx;
- }
fn next_chapter(&mut self) {
- if self.chapter_idx < self.toc.len() - 1 {
- self.get_chapter(self.chapter_idx + 1);
- self.pos = 0;
+ if self.chapter < self.toc.len() - 1 {
+ self.chapter += 1;
+ self.line = 0;
}
}
fn prev_chapter(&mut self) {
- if self.chapter_idx > 0 {
- self.get_chapter(self.chapter_idx - 1);
- self.pos = 0;
+ if self.chapter > 0 {
+ self.chapter -= 1;
+ self.line = 0;
}
}
fn scroll_down(&mut self, n: usize) {
- if self.rows < self.chapter.len() - self.pos {
- self.pos += n;
+ if self.line + self.rows < self.lines().len() {
+ self.line += n;
} else {
self.next_chapter();
}
}
fn scroll_up(&mut self, n: usize) {
- if self.pos > 0 {
- self.pos = self.pos.saturating_sub(n);
+ if self.line > 0 {
+ self.line = self.line.saturating_sub(n);
} else {
self.prev_chapter();
- self.pos = (self.chapter.len() / self.rows) * self.rows;
+ self.line = self.lines().len().saturating_sub(self.rows);
}
}
fn search(&mut self, dir: Direction) {
+ // https://doc.rust-lang.org/std/vec/struct.Vec.html#method.binary_search
+ // If the value is not found then Result::Err is returned, containing the index where a matching element
+ // could be inserted while maintaining sorted order.
+ let head = (self.chapter, self.chapters[self.chapter].bytes[self.line]);
match dir {
Direction::Forward => {
- if let Some(i) = self.chapter[self.pos..]
- .iter()
- .position(|s| s.contains(&self.search))
- {
- self.pos += i;
+ let rest = (self.chapter+1..self.chapters.len()-1).map(|n| (n, 0));
+ for (c, byte) in std::iter::once(head).chain(rest) {
+ if let Some(index) = self.chapters[c].text[byte..].find(&self.search) {
+ self.line = match self.chapters[c].bytes.binary_search(&(byte + index)) {
+ Ok(n) => n,
+ Err(n) => n-1,
+ };
+ self.chapter = c;
+ break;
+ }
}
}
Direction::Backward => {
- if let Some(i) = self.chapter[..self.pos]
- .iter()
- .rposition(|s| s.contains(&self.search))
- {
- self.pos = i;
+ let rest = (0..self.chapter-1).rev().map(|c| (c, self.chapters[c].text.len()));
+ for (c, byte) in std::iter::once(head).chain(rest) {
+ if let Some(index) = self.chapters[c].text[..byte].rfind(&self.search) {
+ self.line = match self.chapters[c].bytes.binary_search(&index) {
+ Ok(n) => n,
+ Err(n) => n-1,
+ };
+ self.chapter = c;
+ break;
+ }
}
}
}
@@ -408,23 +445,23 @@ fn restore() -> Option<Position> {
}
fn main() {
- let pos = restore().unwrap_or_else(|| {
+ let line = restore().unwrap_or_else(|| {
println!("usage: bk path");
std::process::exit(1);
});
- let epub = Epub::new(&pos.0).unwrap_or_else(|e| {
+ let epub = Epub::new(&line.0).unwrap_or_else(|e| {
println!("error reading epub: {}", e);
std::process::exit(1);
});
- let mut bk = Bk::new(epub, &pos, 3);
+ let mut bk = Bk::new(epub, &line, 75);
// crossterm really shouldn't error
bk.run().unwrap();
std::fs::write(
format!("{}/.local/share/bk", std::env::var("HOME").unwrap()),
- format!("{}\n{}\n{}", pos.0, bk.chapter_idx, bk.pos),
+ format!("{}\n{}\n{}", line.0, bk.chapter, bk.line),
)
.unwrap_or_else(|e| {
println!("error saving position: {}", e);
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 03:14:26 +0000