1use gpui::{Context, Entity, Render, Subscription, WeakEntity, Window, div};
  2use ui::text_for_keystrokes;
  3use workspace::{StatusItemView, item::ItemHandle, ui::prelude::*};
  4
  5use crate::{Vim, VimEvent, VimGlobals};
  6
  7/// The ModeIndicator displays the current mode in the status bar.
  8pub struct ModeIndicator {
  9    vim: Option<WeakEntity<Vim>>,
 10    pending_keys: Option<String>,
 11    vim_subscription: Option<Subscription>,
 12}
 13
 14impl ModeIndicator {
 15    /// Construct a new mode indicator in this window.
 16    pub fn new(window: &mut Window, cx: &mut Context<Self>) -> Self {
 17        cx.observe_pending_input(window, |this: &mut Self, window, cx| {
 18            this.update_pending_keys(window, cx);
 19            cx.notify();
 20        })
 21        .detach();
 22
 23        let handle = cx.entity();
 24        let window_handle = window.window_handle();
 25        cx.observe_new::<Vim>(move |_, window, cx| {
 26            let Some(window) = window else {
 27                return;
 28            };
 29            if window.window_handle() != window_handle {
 30                return;
 31            }
 32            let vim = cx.entity();
 33            handle.update(cx, |_, cx| {
 34                cx.subscribe(&vim, |mode_indicator, vim, event, cx| match event {
 35                    VimEvent::Focused => {
 36                        mode_indicator.vim_subscription =
 37                            Some(cx.observe(&vim, |_, _, cx| cx.notify()));
 38                        mode_indicator.vim = Some(vim.downgrade());
 39                    }
 40                })
 41                .detach()
 42            })
 43        })
 44        .detach();
 45
 46        Self {
 47            vim: None,
 48            pending_keys: None,
 49            vim_subscription: None,
 50        }
 51    }
 52
 53    fn update_pending_keys(&mut self, window: &mut Window, cx: &App) {
 54        self.pending_keys = window
 55            .pending_input_keystrokes()
 56            .map(|keystrokes| text_for_keystrokes(keystrokes, cx));
 57    }
 58
 59    fn vim(&self) -> Option<Entity<Vim>> {
 60        self.vim.as_ref().and_then(|vim| vim.upgrade())
 61    }
 62
 63    fn current_operators_description(&self, vim: Entity<Vim>, cx: &mut Context<Self>) -> String {
 64        let recording = Vim::globals(cx)
 65            .recording_register
 66            .map(|reg| format!("recording @{reg} "))
 67            .into_iter();
 68
 69        let vim = vim.read(cx);
 70        recording
 71            .chain(
 72                cx.global::<VimGlobals>()
 73                    .pre_count
 74                    .map(|count| format!("{}", count)),
 75            )
 76            .chain(vim.selected_register.map(|reg| format!("\"{reg}")))
 77            .chain(vim.operator_stack.iter().map(|item| item.status()))
 78            .chain(
 79                cx.global::<VimGlobals>()
 80                    .post_count
 81                    .map(|count| format!("{}", count)),
 82            )
 83            .collect::<Vec<_>>()
 84            .join("")
 85    }
 86}
 87
 88impl Render for ModeIndicator {
 89    fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
 90        let vim = self.vim();
 91        let Some(vim) = vim else {
 92            return div().hidden().into_any_element();
 93        };
 94
 95        let vim_readable = vim.read(cx);
 96        let label = if let Some(label) = vim_readable.status_label.clone() {
 97            label
 98        } else {
 99            let mode = if vim_readable.temp_mode {
100                format!("(insert) {}", vim_readable.mode)
101            } else {
102                vim_readable.mode.to_string()
103            };
104
105            let current_operators_description = self.current_operators_description(vim.clone(), cx);
106            let pending = self
107                .pending_keys
108                .as_ref()
109                .unwrap_or(&current_operators_description);
110            format!("{} -- {} --", pending, mode).into()
111        };
112
113        Label::new(label)
114            .size(LabelSize::Small)
115            .line_height_style(LineHeightStyle::UiLabel)
116            .into_any_element()
117    }
118}
119
120impl StatusItemView for ModeIndicator {
121    fn set_active_pane_item(
122        &mut self,
123        _active_pane_item: Option<&dyn ItemHandle>,
124        _window: &mut Window,
125        _cx: &mut Context<Self>,
126    ) {
127    }
128}