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|
//! an application state dedicated to displaying a tree
use std::io::{self, Write};
use std::path::PathBuf;
use std::time::Instant;
use termion::color;
use crate::app::{AppState, AppStateCmdResult};
use crate::app_context::AppContext;
use crate::commands::{Action, Command};
use crate::external::Launchable;
use crate::flat_tree::Tree;
use crate::help_states::HelpState;
use crate::patterns::Pattern;
use crate::screens::{self, Screen};
use crate::status::Status;
use crate::task_sync::TaskLifetime;
use crate::tree_build::TreeBuilder;
use crate::tree_options::{OptionBool, TreeOptions};
use crate::tree_views::TreeView;
use crate::verbs::VerbExecutor;
pub struct BrowserState {
pub tree: Tree,
pub filtered_tree: Option<Tree>,
pending_pattern: Option<Pattern>, // a pattern which has not yet be applied
}
impl BrowserState {
pub fn new(path: PathBuf, mut options: TreeOptions, tl: &TaskLifetime) -> Option<BrowserState> {
let pending_pattern = options.pattern;
options.pattern = None;
let builder = TreeBuilder::from(path, options);
match builder.build(screens::max_tree_height() as usize, tl) {
Some(tree) => Some(BrowserState {
tree,
filtered_tree: None,
pending_pattern,
}),
None => None, // interrupted
}
}
pub fn displayed_tree(&self) -> &Tree {
match &self.filtered_tree {
Some(tree) => &tree,
None => &self.tree,
}
}
}
impl AppState for BrowserState {
fn apply(&mut self, cmd: &mut Command, con: &AppContext) -> io::Result<AppStateCmdResult> {
self.pending_pattern = None;
let (_, page_height) = termion::terminal_size().unwrap();
let mut page_height = page_height as i32;
page_height -= 2;
Ok(match &cmd.action {
Action::Back => {
if self.filtered_tree.is_some() {
self.filtered_tree = None;
cmd.raw.clear();
AppStateCmdResult::Keep
} else if self.tree.selection > 0 {
self.tree.selection = 0;
cmd.raw.clear();
AppStateCmdResult::Keep
} else {
AppStateCmdResult::PopState
}
}
Action::MoveSelection(dy) => {
match self.filtered_tree {
Some(ref mut tree) => {
tree.move_selection(*dy, page_height);
}
None => {
self.tree.move_selection(*dy, page_height);
}
};
AppStateCmdResult::Keep
}
Action::ScrollPage(dp) => {
// this should not be computed here
if page_height < self.displayed_tree().lines.len() as i32 {
let dy = dp * page_height;
match self.filtered_tree {
Some(ref mut tree) => {
tree.try_scroll(dy, page_height);
}
None => {
self.tree.try_scroll(dy, page_height);
}
};
}
AppStateCmdResult::Keep
}
Action::OpenSelection => {
let tree = match &self.filtered_tree {
Some(tree) => tree,
None => &self.tree,
};
if tree.selected_line().is_dir() {
let tl = TaskLifetime::unlimited();
AppStateCmdResult::from_optional_state(BrowserState::new(
tree.selected_line().path.clone(),
// tree.options.clone(),
tree.options.without_pattern(),
&tl,
))
} else {
AppStateCmdResult::Launch(Launchable::opener(&tree.selected_line().path)?)
}
}
Action::Verb(verb_key) => match con.verb_store.get(&verb_key) {
Some(verb) => self.execute_verb(verb, con)?,
None => AppStateCmdResult::verb_not_found(&verb_key),
},
Action::PatternEdit(pat) => match pat.len() {
0 => {
self.filtered_tree = None;
AppStateCmdResult::Keep
}
_ => {
self.pending_pattern = Some(Pattern::from(pat));
AppStateCmdResult::Keep
}
},
Action::Help(about) => AppStateCmdResult::NewState(Box::new(HelpState::new(&about))),
Action::Next => {
if let Some(ref mut tree) = self.filtered_tree {
tree.try_select_next_match();
tree.make_selection_visible(page_height);
}
AppStateCmdResult::Keep
}
_ => AppStateCmdResult::Keep,
})
}
fn has_pending_tasks(&self) -> bool {
if self.pending_pattern.is_some() {
return true;
}
if self.displayed_tree().has_dir_missing_size() {
return true;
}
false
}
fn do_pending_task(&mut self, tl: &TaskLifetime) {
if let Some(pat) = &mut self.pending_pattern {
let start = Instant::now();
let mut options = self.tree.options.clone();
options.pattern = Some(pat.clone());
let root = self.tree.root().clone();
let len = self.tree.lines.len() as u16;
let mut filtered_tree = TreeBuilder::from(root, options).build(len as usize, tl);
if let Some(ref mut filtered_tree) = filtered_tree {
info!("Tree search took {:?}", start.elapsed());
filtered_tree.try_select_best_match();
let (_, page_height) = termion::terminal_size().unwrap();
let mut page_height = page_height as i32;
page_height -= 2;
filtered_tree.make_selection_visible(page_height);
} // if none: task was cancelled from elsewhere
self.filtered_tree = filtered_tree;
self.pending_pattern = None;
return;
}
if let Some(ref mut tree) = self.filtered_tree {
tree.fetch_some_missing_dir_size(tl);
} else {
self.tree.fetch_some_missing_dir_size(tl);
}
}
fn display(&mut self, screen: &mut Screen, _con: &AppContext) -> io::Result<()> {
screen.write_tree(&self.displayed_tree())
}
fn write_status(&self, screen: &mut Screen, cmd: &Command, con: &AppContext) -> io::Result<()> {
match &cmd.action {
Action::PatternEdit(_) => {
screen.write_status_text("Hit <enter> to select, <esc> to remove the filter")
}
Action::VerbEdit(verb_key) => match con.verb_store.get(&verb_key) {
Some(verb) => screen.write_status_text(
&format!(
"Hit <enter> to {} : {}",
&verb.name,
verb.description_for(&self)
)
.to_string(),
),
None => screen.write_status_text(
// TODO show what verbs start with the currently edited verb key
"Type a verb then <enter> to execute it (hit '?' for the list of verbs)",
),
},
_ => {
let tree = self.displayed_tree();
if tree.selection == 0 {
screen.write_status_text(
"Hit <enter> to quit, '?' for help, or type a few file's letters to navigate",
)
} else {
let line = &tree.lines[tree.selection];
screen.write_status_text(match line.is_dir() {
true => "Hit <enter> to focus, or type a space then a verb",
false => "Hit <enter> to open the file, or type a space then a verb",
})
}
}
}
}
fn write_flags(&self, screen: &mut Screen, _con: &AppContext) -> io::Result<()>
|
