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use std::cmp::min;
use tuikit::attr::*;
use tuikit::term::Term;
use crate::config::Colors;
use crate::content_window::ContentWindow;
use crate::fileinfo::fileinfo_attr;
use crate::help::HELP_LINES;
use crate::mode::Mode;
use crate::status::Status;
/// Is responsible for displaying content in the terminal.
/// It uses an already created terminal.
pub struct Display {
/// The Tuikit terminal attached to the display.
/// It will print every symbol shown on screen.
pub term: Term,
colors: Colors,
}
impl Display {
/// Returns a new `Display` instance from a `tuikit::term::Term` object.
pub fn new(term: Term, colors: Colors) -> Self {
Self { term, colors }
}
const EDIT_BOX_OFFSET: usize = 10;
const SORT_CURSOR_OFFSET: usize = 36;
const LINE_ATTR: Attr = Attr {
fg: Color::CYAN,
bg: Color::Default,
effect: Effect::empty(),
};
/// Display every possible content in the terminal.
///
/// The top line
///
/// The files if we're displaying them
///
/// The cursor if a content is editable
///
/// The help if `Mode::Help`
///
/// The jump_list if `Mode::Jump`
///
/// The completion list if any.
///
/// The preview in preview mode.
pub fn display_all(&mut self, status: &Status) {
self.first_line(status);
self.files(status);
self.cursor(status);
self.help(status);
self.jump_list(status);
self.completion(status);
self.preview(status);
}
/// Reads and returns the `tuikit::term::Term` height.
pub fn height(&self) -> usize {
let (_, height) = self.term.term_size().unwrap();
height
}
/// Display the top line on terminal.
/// Its content depends on the mode.
/// In normal mode we display the path and number of files.
/// When a confirmation is needed we ask the user to input `'y'` or
/// something else.
fn first_line(&mut self, status: &Status) {
let first_row: String = match status.mode {
Mode::Normal => {
format!(
"Path: {} -- {} files",
status.path_content.path.to_str().unwrap(),
status.path_content.files.len(),
)
}
Mode::NeedConfirmation => {
format!("Confirm {} (y/n) : ", status.last_edition)
}
Mode::Preview => match status.path_content.selected_file() {
Some(fileinfo) => format!("{:?} {}", status.mode.clone(), fileinfo.filename),
None => "".to_owned(),
},
_ => {
format!("{:?} {}", status.mode.clone(), status.input.string.clone())
}
};
let _ = self.term.print_with_attr(0, 0, &first_row, Self::LINE_ATTR);
}
/// Displays the current directory content, one line per item like in
/// `ls -l`.
///
/// Those files are always shown, which make it a little bit faster in;
/// normal (ie. default) mode.
/// Where there's too much files, only those around the selected one are
/// displayed.
fn files(&mut self, status: &Status) {
let strings = status.path_content.strings();
for (i, string) in strings
.iter()
.enumerate()
.take(min(strings.len(), status.window.bottom + 1))
.skip(status.window.top)
{
let row = i + ContentWindow::WINDOW_MARGIN_TOP - status.window.top;
let mut attr = fileinfo_attr(&status.path_content.files[i], &self.colors);
if status.flagged.contains(&status.path_content.files[i].path) {
attr.effect |= Effect::UNDERLINE;
}
let _ = self.term.print_with_attr(row, 0, string, attr);
}
}
/// Display a cursor in the top row, at a correct column.
fn cursor(&mut self, status: &Status) {
match status.mode {
Mode::Normal | Mode::Help => {
let _ = self.term.show_cursor(false);
}
Mode::NeedConfirmation => {
let _ = self.term.set_cursor(0, status.last_edition.offset());
}
Mode::Sort => {
let _ = self.term.set_cursor(0, Self::SORT_CURSOR_OFFSET);
}
_ => {
let _ = self
.term
.set_cursor(0, status.input.cursor_index + Self::EDIT_BOX_OFFSET);
}
}
}
/// Display the help message with default keybindings.
fn help(&mut self, status: &Status) {
if let Mode::Help = status.mode {
let _ = self.term.clear();
for (row, line) in HELP_LINES.split('\n').enumerate() {
let _ = self.term.print(row, 0, line);
}
};
}
/// Display the possible jump destination from flagged files.
fn jump_list(&mut self, status: &Status) {
if let Mode::Jump = status.mode {
let _ = self.term.clear();
let _ = self.term.print(0, 0, "Jump to...");
for (row, path) in status.flagged.iter().enumerate() {
let mut attr = Attr::default();
if row == status.jump_index {
attr.effect |= Effect::REVERSE;
}
let _ = self
.term
.print_with_attr(row + 1, 4, path.to_str().unwrap(), attr);
}
}
}
/// Display the possible completion items. The currently selected one is
/// reversed.
fn completion(&mut self, status: &Status) {
match status.mode {
Mode::Goto | Mode::Exec | Mode::Search => {
let _ = self.term.clear();
self.first_line(status);
let _ = self
.term
.set_cursor(0, status.input.cursor_index + Self::EDIT_BOX_OFFSET);
for (row, candidate) in status.completion.proposals.iter().enumerate() {
let mut attr = Attr::default();
if row == status.completion.index {
attr.effect |= Effect::REVERSE;
}
let _ = self.term.print_with_attr(row + 1, 4, candidate, attr);
}
}
_ => (),
}
}
/// Display a scrollable preview of a file.
fn preview(&mut self, status: &Status) {
if let Mode::Preview = status.mode {
let _ = self.term.clear();
self.first_line(status);
let content_attr = Attr::default();
let line_number_offset = status.preview_lines.len().to_string().len() + 2;
for (i, line) in status
.preview_lines
.iter()
.enumerate()
.take(min(status.preview_lines.len(), status.window.bottom + 1))
.skip(status.window.top)
{
let row = i + ContentWindow::WINDOW_MARGIN_TOP - status.window.top;
let _ =
self.term
.print_with_attr(row + 2, 0, &(i + 1).to_string(), Self::LINE_ATTR);
let _ = self
.term
.print_with_attr(row + 2, line_number_offset, line, content_attr);
}
}
}
}
|
