801 lines
28 KiB
Rust
801 lines
28 KiB
Rust
/*
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* meli - pager
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*
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* Copyright 2020 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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use super::*;
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use melib::text_processing::LineBreakText;
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/// A pager for text.
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/// `Pager` holds its own content in its own `CellBuffer` and when `draw` is called, it draws the
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/// current view of the text. It is responsible for scrolling etc.
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#[derive(Default, Debug, Clone)]
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pub struct Pager {
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text: String,
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cursor: (usize, usize),
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reflow: Reflow,
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height: usize,
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width: usize,
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minimum_width: usize,
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search: Option<SearchPattern>,
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dirty: bool,
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colors: ThemeAttribute,
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initialised: bool,
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show_scrollbar: bool,
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content: CellBuffer,
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raw: bool,
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text_lines: Vec<String>,
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line_breaker: LineBreakText,
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movement: Option<PageMovement>,
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id: ComponentId,
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}
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impl fmt::Display for Pager {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", Pager::DESCRIPTION)
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}
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}
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impl Pager {
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pub const DESCRIPTION: &'static str = "pager";
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const PAGES_AHEAD_TO_RENDER_NO: usize = 16;
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pub fn new(context: &Context) -> Self {
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let mut ret = Pager::default();
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ret.minimum_width = context.settings.pager.minimum_width;
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ret.set_colors(crate::conf::value(context, "theme_default"))
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.set_reflow(if context.settings.pager.split_long_lines {
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Reflow::All
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} else {
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Reflow::No
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});
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ret
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}
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pub fn set_show_scrollbar(&mut self, new_val: bool) -> &mut Self {
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self.show_scrollbar = new_val;
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self
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}
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pub fn set_colors(&mut self, new_val: ThemeAttribute) -> &mut Self {
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self.colors = new_val;
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self
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}
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pub fn set_reflow(&mut self, new_val: Reflow) -> &mut Self {
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self.reflow = new_val;
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self
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}
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pub fn set_initialised(&mut self, new_val: bool) -> &mut Self {
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self.initialised = new_val;
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self
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}
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pub fn reflow(&self) -> Reflow {
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self.reflow
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}
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pub fn update_from_str(&mut self, text: &str, mut width: Option<usize>) {
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if let Some(ref mut width) = width.as_mut() {
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if **width < self.minimum_width {
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**width = self.minimum_width;
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}
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}
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self.text = text.to_string();
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self.text_lines.clear();
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self.line_breaker = LineBreakText::new(self.text.clone(), self.reflow, width);
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self.height = 0;
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self.width = 0;
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self.search = None;
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self.set_dirty(true);
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self.initialised = false;
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self.cursor = (0, 0);
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}
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pub fn from_string(
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text: String,
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context: Option<&Context>,
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cursor_pos: Option<usize>,
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mut width: Option<usize>,
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colors: ThemeAttribute,
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) -> Self {
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let pager_filter: Option<&String> = if let Some(context) = context {
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context.settings.pager.filter.as_ref()
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} else {
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None
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};
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let pager_minimum_width: usize = if let Some(context) = context {
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context.settings.pager.minimum_width
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} else {
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0
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};
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let reflow: Reflow = if let Some(context) = context {
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if context.settings.pager.split_long_lines {
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Reflow::All
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} else {
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Reflow::No
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}
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} else {
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Reflow::All
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};
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if let Some(ref mut width) = width.as_mut() {
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if **width < pager_minimum_width {
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**width = pager_minimum_width;
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}
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}
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if let Some(content) = pager_filter.and_then(|bin| {
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use std::io::Write;
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use std::process::{Command, Stdio};
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let mut filter_child = Command::new("sh")
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.args(&["-c", bin])
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.spawn()
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.expect("Failed to start pager filter process");
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let stdin = filter_child.stdin.as_mut().expect("failed to open stdin");
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stdin
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.write_all(text.as_bytes())
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.expect("Failed to write to stdin");
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let out = filter_child
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.wait_with_output()
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.expect("Failed to wait on filter")
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.stdout;
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let mut dev_null = std::fs::File::open("/dev/null").ok()?;
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let mut embedded = crate::terminal::embed::EmbedGrid::new();
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embedded.set_terminal_size((80, 20));
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for b in out {
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embedded.process_byte(&mut dev_null, b);
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}
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Some(std::mem::replace(embedded.buffer_mut(), Default::default()))
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}) {
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return Pager::from_buf(content, cursor_pos);
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}
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Pager {
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text,
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text_lines: vec![],
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reflow,
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cursor: (0, cursor_pos.unwrap_or(0)),
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height: 1,
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width: 1,
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minimum_width: pager_minimum_width,
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initialised: false,
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dirty: true,
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id: ComponentId::new_v4(),
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raw: false,
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colors,
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..Default::default()
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}
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}
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pub fn from_buf(content: CellBuffer, cursor_pos: Option<usize>) -> Self {
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let (width, height) = content.size();
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Pager {
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text: String::new(),
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cursor: (0, cursor_pos.unwrap_or(0)),
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height,
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width,
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dirty: true,
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content,
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raw: true,
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initialised: false,
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id: ComponentId::new_v4(),
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..Default::default()
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}
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}
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pub fn cursor_pos(&self) -> usize {
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self.cursor.1
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}
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pub fn size(&self) -> (usize, usize) {
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(self.width, self.height)
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}
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pub fn initialise(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
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let mut width = width!(area);
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if width < self.minimum_width {
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width = self.minimum_width;
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}
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if !self.raw {
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if self.line_breaker.width() != Some(width.saturating_sub(4)) {
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let line_breaker = LineBreakText::new(
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self.text.clone(),
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self.reflow,
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Some(width.saturating_sub(4)),
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);
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self.line_breaker = line_breaker;
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self.text_lines.clear();
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};
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self.height = self.text_lines.len();
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self.width = width;
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if let Some(ref mut search) = self.search {
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use melib::text_processing::search::KMP;
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search.positions.clear();
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for (y, l) in self.text_lines.iter().enumerate() {
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search.positions.extend(
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l.kmp_search(&search.pattern)
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.into_iter()
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.map(|offset| (y, offset)),
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);
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}
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if let Some(pos) = search.positions.get(search.cursor) {
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if self.cursor.1 > pos.0 || self.cursor.1 + height!(area) < pos.0 {
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self.cursor.1 = pos.0.saturating_sub(3);
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}
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}
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}
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self.draw_lines_up_to(
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grid,
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area,
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context,
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self.cursor.1 + Self::PAGES_AHEAD_TO_RENDER_NO * height!(area),
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);
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}
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self.draw_page(grid, area, context);
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self.initialised = true;
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}
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pub fn draw_lines_up_to(
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&mut self,
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_grid: &mut CellBuffer,
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area: Area,
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_context: &mut Context,
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up_to: usize,
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) {
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if self.line_breaker.is_finished() {
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return;
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}
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let old_lines_no = self.text_lines.len();
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if up_to == 0 {
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self.text_lines.extend(self.line_breaker.by_ref());
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} else {
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if old_lines_no >= up_to + height!(area) {
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return;
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}
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let new_lines_no = (up_to + height!(area)) - old_lines_no;
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self.text_lines
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.extend(self.line_breaker.by_ref().take(new_lines_no));
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};
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let new_lines_no = self.text_lines.len() - old_lines_no;
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if let Some(ref mut search) = self.search {
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use melib::text_processing::search::KMP;
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for (y, l) in self.text_lines.iter().enumerate().skip(old_lines_no) {
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search.positions.extend(
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l.kmp_search(&search.pattern)
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.into_iter()
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.map(|offset| (y, offset)),
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);
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}
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}
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self.height += new_lines_no;
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}
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fn draw_page(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
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if self.raw {
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copy_area(
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grid,
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&self.content,
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area,
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(
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(
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std::cmp::min(
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self.cursor.0.saturating_sub(width!(area)),
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self.content.size().0.saturating_sub(width!(area)),
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),
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std::cmp::min(
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self.cursor.1.saturating_sub(height!(area)),
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self.content.size().1.saturating_sub(height!(area)),
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),
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),
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pos_dec(self.content.size(), (1, 1)),
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),
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);
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return;
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}
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let (mut upper_left, bottom_right) = area;
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for l in self
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.text_lines
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.iter()
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.skip(self.cursor.1)
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.take(height!(area) + 1)
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{
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write_string_to_grid(
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l,
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grid,
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self.colors.fg,
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self.colors.bg,
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Attr::DEFAULT,
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(upper_left, bottom_right),
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None,
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);
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if l.starts_with("⤷") {
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grid[upper_left]
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.set_fg(Color::Byte(240))
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.set_attrs(Attr::BOLD);
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}
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upper_left = pos_inc(upper_left, (0, 1));
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}
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if get_y(upper_left) <= get_y(bottom_right) {
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clear_area(
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grid,
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(upper_left, bottom_right),
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crate::conf::value(context, "theme_default"),
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);
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}
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let (upper_left, _bottom_right) = area;
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#[cfg(feature = "regexp")]
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{
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for text_formatter in crate::conf::text_format_regexps(context, "pager.envelope.body") {
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let t = grid.insert_tag(text_formatter.tag);
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for (i, l) in self
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.text_lines
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.iter()
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.skip(self.cursor.1)
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.enumerate()
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.take(height!(area) + 1)
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{
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let i = i + get_y(upper_left);
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for (start, end) in text_formatter.regexp.find_iter(l) {
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let start = start + get_x(upper_left);
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let end = end + get_x(upper_left);
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grid.set_tag(t, (start, i), (end, i));
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}
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}
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}
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}
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let cursor_line = self.cursor.1;
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if let Some(ref mut search) = self.search {
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let results_attr = crate::conf::value(context, "pager.highlight_search");
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let results_current_attr =
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crate::conf::value(context, "pager.highlight_search_current");
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search.cursor = std::cmp::min(search.positions.len().saturating_sub(1), search.cursor);
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for (i, (y, x)) in search
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.positions
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.iter()
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.enumerate()
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.filter(|(_, (y, _))| *y >= cursor_line)
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.take(height!(area) + 1)
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{
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let x = *x + get_x(upper_left);
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let y = *y - cursor_line;
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for c in grid.row_iter(
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x..x + search.pattern.grapheme_width(),
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y + get_y(upper_left),
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) {
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if i == search.cursor {
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grid[c]
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.set_fg(results_current_attr.fg)
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.set_bg(results_current_attr.bg)
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.set_attrs(results_current_attr.attrs);
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} else {
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grid[c]
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.set_fg(results_attr.fg)
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.set_bg(results_attr.bg)
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.set_attrs(results_attr.attrs);
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}
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}
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}
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}
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}
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}
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impl Component for Pager {
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fn draw(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
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if !is_valid_area!(area) {
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return;
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}
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if !self.is_dirty() {
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return;
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}
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if !self.initialised {
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self.initialise(grid, area, context);
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}
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self.dirty = false;
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let height = height!(area);
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if let Some(mvm) = self.movement.take() {
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match mvm {
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PageMovement::Up(amount) => {
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self.cursor.1 = self.cursor.1.saturating_sub(amount);
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}
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PageMovement::PageUp(multiplier) => {
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self.cursor.1 = self.cursor.1.saturating_sub(height * multiplier);
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}
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PageMovement::Down(amount) => {
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if self.cursor.1 + amount + 1 < self.height {
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self.cursor.1 += amount;
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} else {
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self.cursor.1 = self.height.saturating_sub(1);
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}
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self.draw_lines_up_to(
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grid,
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area,
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context,
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self.cursor.1 + Self::PAGES_AHEAD_TO_RENDER_NO * height,
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);
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}
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PageMovement::PageDown(multiplier) => {
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if self.cursor.1 + height * multiplier + 1 < self.height {
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self.cursor.1 += height * multiplier;
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} else if self.cursor.1 + height * multiplier > self.height {
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self.cursor.1 = self.height.saturating_sub(1);
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} else {
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self.cursor.1 = (self.height / height) * height;
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}
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self.draw_lines_up_to(
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grid,
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area,
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context,
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self.cursor.1 + Self::PAGES_AHEAD_TO_RENDER_NO * height,
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);
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}
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PageMovement::Right(amount) => {
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if self.cursor.0 + amount + 1 < self.width {
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self.cursor.0 += amount;
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} else {
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self.cursor.0 = self.width.saturating_sub(1);
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}
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}
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PageMovement::Left(amount) => {
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self.cursor.0 = self.cursor.0.saturating_sub(amount);
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}
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PageMovement::Home => {
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self.cursor.1 = 0;
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}
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PageMovement::End => {
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self.draw_lines_up_to(grid, area, context, 0);
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self.cursor.1 = self.height.saturating_sub(1);
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}
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}
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}
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if self.height == 0 || self.width == 0 {
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return;
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}
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if let Some(ref mut search) = self.search {
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if !search.positions.is_empty() {
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if let Some(mvm) = search.movement.take() {
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match mvm {
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PageMovement::Up(_) => {
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if self.cursor.1 > search.positions[search.cursor].0 {
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self.cursor.1 = search.positions[search.cursor].0;
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}
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}
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PageMovement::Down(_) => {
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if self.cursor.1 + height < search.positions[search.cursor].0 {
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self.cursor.1 = search.positions[search.cursor].0;
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}
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}
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_ => {}
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}
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}
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}
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}
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clear_area(grid, area, crate::conf::value(context, "theme_default"));
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let (mut cols, mut rows) = (width!(area), height!(area));
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if cols < 2 || rows < 2 {
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return;
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}
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let (width, height) = (self.line_breaker.width().unwrap_or(cols), self.height);
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if self.show_scrollbar && rows < height {
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cols -= 1;
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rows -= 1;
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} else if self.search.is_some() {
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rows -= 1;
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}
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if self.show_scrollbar && cols < width {
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rows -= 1;
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}
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self.cursor = (
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std::cmp::min(width.saturating_sub(cols), self.cursor.0),
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std::cmp::min(height.saturating_sub(rows), self.cursor.1),
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);
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self.draw_page(
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grid,
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(upper_left!(area), pos_inc(upper_left!(area), (cols, rows))),
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context,
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);
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if self.show_scrollbar && rows < height {
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ScrollBar::default().set_show_arrows(true).draw(
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grid,
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(
|
|
set_x(upper_left!(area), get_x(bottom_right!(area))),
|
|
bottom_right!(area),
|
|
),
|
|
context,
|
|
/* position */
|
|
self.cursor.1,
|
|
/* visible_rows */
|
|
rows,
|
|
/* length */
|
|
height,
|
|
);
|
|
}
|
|
if self.show_scrollbar && cols < width {
|
|
ScrollBar::default().set_show_arrows(true).draw_horizontal(
|
|
grid,
|
|
(
|
|
set_y(upper_left!(area), get_y(bottom_right!(area))),
|
|
bottom_right!(area),
|
|
),
|
|
context,
|
|
self.cursor.0,
|
|
cols,
|
|
width,
|
|
);
|
|
}
|
|
if (rows < height) || self.search.is_some() {
|
|
const RESULTS_STR: &str = "Results for ";
|
|
let shown_lines = self.cursor.1 + rows;
|
|
let total_lines = height;
|
|
if rows < height {
|
|
context
|
|
.replies
|
|
.push_back(UIEvent::StatusEvent(StatusEvent::ScrollUpdate(
|
|
ScrollUpdate::Update {
|
|
id: self.id,
|
|
context: ScrollContext {
|
|
shown_lines,
|
|
total_lines,
|
|
has_more_lines: !self.line_breaker.is_finished(),
|
|
},
|
|
},
|
|
)));
|
|
} else {
|
|
context
|
|
.replies
|
|
.push_back(UIEvent::StatusEvent(StatusEvent::ScrollUpdate(
|
|
ScrollUpdate::End(self.id),
|
|
)));
|
|
};
|
|
if let Some(ref search) = self.search {
|
|
let status_message = format!(
|
|
"{results_str}{search_pattern}: {current_pos}/{total_results}{has_more_lines}",
|
|
results_str = RESULTS_STR,
|
|
search_pattern = &search.pattern,
|
|
current_pos = if search.positions.is_empty() {
|
|
0
|
|
} else {
|
|
search.cursor + 1
|
|
},
|
|
total_results = search.positions.len(),
|
|
has_more_lines = if self.line_breaker.is_finished() {
|
|
""
|
|
} else {
|
|
"(+)"
|
|
}
|
|
);
|
|
let mut attribute = crate::conf::value(context, "status.bar");
|
|
if !context.settings.terminal.use_color() {
|
|
attribute.attrs |= Attr::REVERSE;
|
|
}
|
|
let (_, y) = write_string_to_grid(
|
|
&status_message,
|
|
grid,
|
|
attribute.fg,
|
|
attribute.bg,
|
|
attribute.attrs,
|
|
(
|
|
set_y(upper_left!(area), get_y(bottom_right!(area))),
|
|
bottom_right!(area),
|
|
),
|
|
None,
|
|
);
|
|
/* set search pattern to italics */
|
|
let start_x = get_x(upper_left!(area)) + RESULTS_STR.len();
|
|
for c in grid.row_iter(start_x..(start_x + search.pattern.grapheme_width()), y) {
|
|
grid[c].set_attrs(attribute.attrs | Attr::ITALICS);
|
|
}
|
|
};
|
|
}
|
|
context.dirty_areas.push_back(area);
|
|
}
|
|
|
|
fn process_event(&mut self, event: &mut UIEvent, context: &mut Context) -> bool {
|
|
let shortcuts = self.get_shortcuts(context);
|
|
match event {
|
|
UIEvent::ConfigReload { old_settings: _ } => {
|
|
self.set_colors(crate::conf::value(context, "theme_default"));
|
|
self.set_dirty(true);
|
|
}
|
|
UIEvent::Input(ref key)
|
|
if shortcut!(key == shortcuts[Self::DESCRIPTION]["scroll_up"]) =>
|
|
{
|
|
self.movement = Some(PageMovement::Up(1));
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(ref key)
|
|
if shortcut!(key == shortcuts[Self::DESCRIPTION]["scroll_down"]) =>
|
|
{
|
|
self.movement = Some(PageMovement::Down(1));
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::Home) => {
|
|
self.movement = Some(PageMovement::Home);
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::End) => {
|
|
self.movement = Some(PageMovement::End);
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::Left) => {
|
|
self.movement = Some(PageMovement::Left(1));
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::Right) => {
|
|
self.movement = Some(PageMovement::Right(1));
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(ref key)
|
|
if shortcut!(key == shortcuts[Self::DESCRIPTION]["page_up"]) =>
|
|
{
|
|
self.movement = Some(PageMovement::PageUp(1));
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(ref key)
|
|
if shortcut!(key == shortcuts[Self::DESCRIPTION]["page_down"]) =>
|
|
{
|
|
self.movement = Some(PageMovement::PageDown(1));
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::ChangeMode(UIMode::Normal) => {
|
|
self.dirty = true;
|
|
}
|
|
UIEvent::Action(View(Pipe(ref bin, ref args))) => {
|
|
use std::io::Write;
|
|
use std::process::{Command, Stdio};
|
|
let mut command_obj = match Command::new(bin)
|
|
.args(args.as_slice())
|
|
.stdin(Stdio::piped())
|
|
.stdout(Stdio::piped())
|
|
.spawn()
|
|
{
|
|
Ok(o) => o,
|
|
Err(e) => {
|
|
context.replies.push_back(UIEvent::StatusEvent(
|
|
StatusEvent::DisplayMessage(format!(
|
|
"Could not pipe to {}: {}",
|
|
bin, e
|
|
)),
|
|
));
|
|
return true;
|
|
}
|
|
};
|
|
let stdin = command_obj.stdin.as_mut().expect("failed to open stdin");
|
|
stdin
|
|
.write_all(self.text.as_bytes())
|
|
.expect("Failed to write to stdin");
|
|
|
|
context
|
|
.replies
|
|
.push_back(UIEvent::StatusEvent(StatusEvent::DisplayMessage(format!(
|
|
"Pager text piped to '{}{}{}'",
|
|
&bin,
|
|
if args.is_empty() { "" } else { " " },
|
|
args.join(" ")
|
|
))));
|
|
return true;
|
|
}
|
|
UIEvent::Action(Action::Listing(ListingAction::Search(pattern))) => {
|
|
self.search = Some(SearchPattern {
|
|
pattern: pattern.to_string(),
|
|
positions: vec![],
|
|
cursor: 0,
|
|
movement: Some(PageMovement::Home),
|
|
});
|
|
self.initialised = false;
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::Char('n')) if self.search.is_some() => {
|
|
if let Some(ref mut search) = self.search {
|
|
search.movement = Some(PageMovement::Down(1));
|
|
search.cursor += 1;
|
|
} else {
|
|
unsafe {
|
|
std::hint::unreachable_unchecked();
|
|
}
|
|
}
|
|
self.initialised = false;
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::Char('N')) if self.search.is_some() => {
|
|
if let Some(ref mut search) = self.search {
|
|
search.movement = Some(PageMovement::Up(1));
|
|
search.cursor = search.cursor.saturating_sub(1);
|
|
} else {
|
|
unsafe {
|
|
std::hint::unreachable_unchecked();
|
|
}
|
|
}
|
|
self.initialised = false;
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Input(Key::Esc) if self.search.is_some() => {
|
|
self.search = None;
|
|
self.initialised = false;
|
|
self.dirty = true;
|
|
return true;
|
|
}
|
|
UIEvent::Resize => {
|
|
self.initialised = false;
|
|
self.dirty = true;
|
|
}
|
|
UIEvent::VisibilityChange(false) => {
|
|
context
|
|
.replies
|
|
.push_back(UIEvent::StatusEvent(StatusEvent::ScrollUpdate(
|
|
ScrollUpdate::End(self.id),
|
|
)));
|
|
}
|
|
_ => {}
|
|
}
|
|
false
|
|
}
|
|
|
|
fn is_dirty(&self) -> bool {
|
|
self.dirty
|
|
}
|
|
|
|
fn set_dirty(&mut self, value: bool) {
|
|
self.dirty = value;
|
|
}
|
|
|
|
fn get_shortcuts(&self, context: &Context) -> ShortcutMaps {
|
|
let config_map: IndexMap<&'static str, Key> = context.settings.shortcuts.pager.key_values();
|
|
let mut ret: ShortcutMaps = Default::default();
|
|
ret.insert(Pager::DESCRIPTION, config_map);
|
|
ret
|
|
}
|
|
|
|
fn id(&self) -> ComponentId {
|
|
self.id
|
|
}
|
|
|
|
fn set_id(&mut self, id: ComponentId) {
|
|
self.id = id;
|
|
}
|
|
}
|