Move status tab into its own component

8 files changed, 558 insertions, 420 deletions

diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 00000000..4f8d5082
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,13 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "(OSX) Launch",
+            "type": "lldb",
+            "request": "launch",
+            "program": "${workspaceRoot}/target/debug/gitui",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+        }
+    ]
+}
\ No newline at end of file
diff --git a/src/app.rs b/src/app.rs
index 9bfb5c68..98ea895d 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,19 +1,16 @@
 use crate::{
+    accessors,
     components::{
-        ChangesComponent, CommandBlocking, CommandInfo,
-        CommitComponent, Component, DiffComponent, DrawableComponent,
-        FileTreeItemKind, HelpComponent, MsgComponent,
+        event_pump, CommandBlocking, CommandInfo, CommitComponent,
+        Component, DrawableComponent, HelpComponent, MsgComponent,
         ResetComponent,
     },
     keys,
     queue::{InternalEvent, NeedsUpdate, Queue},
     strings,
-    tabs::Revlog,
-};
-use asyncgit::{
-    current_tick, sync, AsyncDiff, AsyncNotification, AsyncStatus,
-    DiffParams, CWD,
+    tabs::{Revlog, Status},
 };
+use asyncgit::{sync, AsyncNotification, CWD};
 use crossbeam_channel::Sender;
 use crossterm::event::Event;
 use itertools::Itertools;
@@ -29,55 +26,16 @@ use tui::{
 };
 
 ///
-#[derive(PartialEq)]
-enum DiffTarget {
-    Stage,
-    WorkingDir,
-}
-
-///
-#[derive(PartialEq)]
-enum Focus {
-    WorkDir,
-    Diff,
-    Stage,
-}
-
-/// allows generating code to make sure
-/// we always enumerate all components in both getter functions
-macro_rules! components {
-    ($self:ident, [$($element:ident),+]) => {
-        fn components(& $self) -> Vec<&dyn Component> {
-            vec![
-                $(&$self.$element,)+
-            ]
-        }
-
-        fn components_mut(&mut $self) -> Vec<&mut dyn Component> {
-            vec![
-                $(&mut $self.$element,)+
-            ]
-        }
-    };
-}
-
-///
 pub struct App {
-    focus: Focus,
-    diff_target: DiffTarget,
     do_quit: bool,
-    reset: ResetComponent,
-    commit: CommitComponent,
     help: HelpComponent,
-    index: ChangesComponent,
-    index_wd: ChangesComponent,
-    diff: DiffComponent,
     msg: MsgComponent,
-    git_diff: AsyncDiff,
-    git_status: AsyncStatus,
+    reset: ResetComponent,
+    commit: CommitComponent,
     current_commands: Vec<CommandInfo>,
     tab: usize,
     revlog: Revlog,
+    status_tab: Status,
     queue: Queue,
 }
 
@@ -87,31 +45,15 @@ impl App {
     pub fn new(sender: &Sender<AsyncNotification>) -> Self {
         let queue = Queue::default();
         Self {
-            focus: Focus::WorkDir,
-            diff_target: DiffTarget::WorkingDir,
-            do_quit: false,
             reset: ResetComponent::new(queue.clone()),
             commit: CommitComponent::new(queue.clone()),
+            do_quit: false,
+            current_commands: Vec::new(),
             help: HelpComponent::default(),
-            index_wd: ChangesComponent::new(
-                strings::TITLE_STATUS,
-                true,
-                true,
-                queue.clone(),
-            ),
-            index: ChangesComponent::new(
-                strings::TITLE_INDEX,
-                false,
-                false,
-                queue.clone(),
-            ),
-            diff: DiffComponent::new(queue.clone()),
             msg: MsgComponent::default(),
-            git_diff: AsyncDiff::new(sender.clone()),
-            git_status: AsyncStatus::new(sender.clone()),
-            current_commands: Vec::new(),
             tab: 0,
             revlog: Revlog::new(&sender),
+            status_tab: Status::new(&sender, &queue),
             queue,
         }
     }
@@ -142,7 +84,7 @@ impl App {
         );
 
         if self.tab == 0 {
-            self.draw_status_tab(f, chunks_main[1]);
+            self.status_tab.draw(f, chunks_main[1]);
         } else {
             self.revlog.draw(f, chunks_main[1]);
         }
@@ -162,40 +104,23 @@ impl App {
 
         let mut flags = NeedsUpdate::empty();
 
-        let event_used = if self.tab == 0 {
-            Self::event_pump(ev, self.components_mut().as_mut_slice())
-        } else {
-            self.revlog.event(ev)
-        };
-
-        if event_used {
+        if event_pump(ev, self.components_mut().as_mut_slice()) {
             flags.insert(NeedsUpdate::COMMANDS);
         } else if let Event::Key(k) = ev {
             let new_flags = match k {
-                keys::FOCUS_WORKDIR => {
-                    self.switch_focus(Focus::WorkDir)
-                }
-                keys::FOCUS_STAGE => self.switch_focus(Focus::Stage),
-                keys::FOCUS_RIGHT if self.can_focus_diff() => {
-                    self.switch_focus(Focus::Diff)
-                }
-                keys::FOCUS_LEFT => {
-                    self.switch_focus(match self.diff_target {
-                        DiffTarget::Stage => Focus::Stage,
-                        DiffTarget::WorkingDir => Focus::WorkDir,
-                    })
-                }
+                //TODO: move into status tab
                 keys::OPEN_COMMIT
-                    if !self.index.is_empty()
-                        && self.offer_open_commit_cmd() =>
+                    if self.status_tab.offer_open_commit_cmd() =>
                 {
                     self.commit.show();
                     NeedsUpdate::COMMANDS
                 }
+
                 keys::TAB_TOGGLE => {
                     self.toggle_tabs();
                     NeedsUpdate::COMMANDS
                 }
+
                 _ => NeedsUpdate::empty(),
             };
 
@@ -211,28 +136,31 @@ impl App {
             self.update();
         }
         if flags.contains(NeedsUpdate::DIFF) {
-            self.update_diff();
+            self.status_tab.update_diff();
         }
         if flags.contains(NeedsUpdate::COMMANDS) {
             self.update_commands();
         }
     }
 
+    //TODO: do we need this?
     ///
     pub fn update(&mut self) {
         trace!("update");
-
-        self.git_diff.refresh();
-        self.git_status.fetch(current_tick());
+        self.status_tab.update();
     }
 
     ///
     pub fn update_git(&mut self, ev: AsyncNotification) {
         trace!("update_git: {:?}", ev);
+
+        self.status_tab.update_git(ev);
+
         match ev {
-            AsyncNotification::Diff => self.update_diff(),
-            AsyncNotification::Status => self.update_status(),
+            AsyncNotification::Diff => (),
             AsyncNotification::Log => self.revlog.update(),
+            //TODO: is that needed?
+            AsyncNotification::Status => self.update_commands(),
         }
     }
 
@@ -243,58 +171,14 @@ impl App {
 
     ///
     pub fn any_work_pending(&self) -> bool {
-        self.git_diff.is_pending()
-            || self.git_status.is_pending()
+        self.status_tab.anything_pending()
             || self.revlog.any_work_pending()
     }
 }
 
 // private impls
 impl App {
-    components!(
-        self,
-        [msg, reset, commit, help, index, index_wd, diff]
-    );
-
-    fn update_diff(&mut self) {
-        if let Some((path, is_stage)) = self.selected_path() {
-            let diff_params = DiffParams(path.clone(), is_stage);
-
-            if self.diff.current() == (path.clone(), is_stage) {
-                // we are already showing a diff of the right file
-                // maybe the diff changed (outside file change)
-                if let Some((params, last)) = self.git_diff.last() {
-                    if params == diff_params {
-                        self.diff.update(path, is_stage, last);
-                    }
-                }
-            } else {
-                // we dont show the right diff right now, so we need to request
-                if let Some(diff) = self.git_diff.request(diff_params)
-                {
-                    self.diff.update(path, is_stage, diff);
-                } else {
-                    self.diff.clear();
-                }
-            }
-        } else {
-            self.diff.clear();
-        }
-    }
-
-    fn selected_path(&self) -> Option<(String, bool)> {
-        let (idx, is_stage) = match self.diff_target {
-            DiffTarget::Stage => (&self.index, true),
-            DiffTarget::WorkingDir => (&self.index_wd, false),
-        };
-
-        if let Some(item) = idx.selection() {
-            if let FileTreeItemKind::File(i) = item.kind {
-                return Some((i.path, is_stage));
-            }
-        }
-        None
-    }
+    accessors!(self, [msg, reset, commit, help, revlog, status_tab]);
 
     fn check_quit(&mut self, ev: Event) {
         if let Event::Key(e) = ev {
@@ -309,35 +193,20 @@ impl App {
         self.tab %= 2;
 
         if self.tab == 1 {
+            self.status_tab.hide();
             self.revlog.show();
         } else {
+            self.status_tab.show();
             self.revlog.hide();
         }
     }
 
-    fn can_focus_diff(&self) -> bool {
-        match self.focus {
-            Focus::WorkDir => self.index_wd.is_file_seleted(),
-            Focus::Stage => self.index.is_file_seleted(),
-            _ => false,
-        }
-    }
-
     fn update_commands(&mut self) {
         self.help.set_cmds(self.commands(true));
         self.current_commands = self.commands(false);
         self.current_commands.sort_by_key(|e| e.order);
     }
 
-    fn update_status(&mut self) {
-        let status = self.git_status.last();
-        self.index.update(&status.stage);
-        self.index_wd.update(&status.work_dir);
-
-        self.update_diff();
-        self.update_commands();
-    }
-
     fn process_queue(&mut self) -> NeedsUpdate {
         let mut flags = NeedsUpdate::empty();
         loop {
@@ -379,7 +248,9 @@ impl App {
                 flags.insert(NeedsUpdate::COMMANDS);
             }
             InternalEvent::AddHunk(hash) => {
-                if let Some((path, is_stage)) = self.selected_path() {
+                if let Some((path, is_stage)) =
+                    self.status_tab.selected_path()
+                {
                     if is_stage {
                         if sync::unstage_hunk(CWD, path, hash) {
                             flags.insert(NeedsUpdate::ALL);
@@ -402,23 +273,13 @@ impl App {
     fn commands(&self, force_all: bool) -> Vec<CommandInfo> {
         let mut res = Vec::new();
 
-        if self.revlog.is_visible() {
-            self.revlog.commands(&mut res, force_all);
-        } else {
-            for c in self.components() {
-                if c.commands(&mut res, force_all)
-                    != CommandBlocking::PassingOn
-                    && !force_all
-                {
-                    break;
-                }
+        for c in self.components() {
+            if c.commands(&mut res, force_all)
+                != CommandBlocking::PassingOn
+                && !force_all
+            {
+                break;
             }
-
-            //TODO: move into status tab component
-            self.add_commands_status_tab(
-                &mut res,
-                !self.any_popup_visible(),
-            );
         }
 
         res.push(
@@ -442,80 +303,6 @@ impl App {
         res
     }
 
-    fn offer_open_commit_cmd(&self) -> bool {
-        !self.commit.is_visible()
-            && self.diff_target == DiffTarget::Stage
-    }
-
-    fn event_pump(
-        ev: Event,
-        components: &mut [&mut dyn Component],
-    ) -> bool {
-        for c in components {
-            if c.event(ev) {
-                return true;
-            }
-        }
-
-        false
-    }
-
-    fn add_commands_status_tab(
-        &self,
-        res: &mut Vec<CommandInfo>,
-        main_cmds_available: bool,
-    ) {
-        {
-            let focus_on_diff = self.focus == Focus::Diff;
-            res.push(CommandInfo::new(
-                commands::STATUS_FOCUS_LEFT,
-                true,
-                main_cmds_available && focus_on_diff,
-            ));
-            res.push(CommandInfo::new(
-                commands::STATUS_FOCUS_RIGHT,
-                self.can_focus_diff(),
-                main_cmds_available && !focus_on_diff,
-            ));
-        }
-
-        res.push(
-            CommandInfo::new(
-                commands::COMMIT_OPEN,
-                !self.index.is_empty(),
-                main_cmds_available && self.offer_open_commit_cmd(),
-            )
-            .order(-1),
-        );
-
-        res.push(
-            CommandInfo::new(
-                commands::SELECT_STATUS,
-                true,
-                main_cmds_available && self.focus == Focus::Diff,
-            )
-            .hidden(),
-        );
-
-        res.push(
-            CommandInfo::new(
-                commands::SELECT_STAGING,
-                true,
-                main_cmds_available && self.focus == Focus::WorkDir,
-            )
-            .order(-2),
-        );
-
-        res.push(
-            CommandInfo::new(
-                commands::SELECT_UNSTAGED,
-                true,
-                main_cmds_available && self.focus == Focus::Stage,
-            )
-            .order(-2),
-        );
-    }
-
     fn any_popup_visible(&self) -> bool {
         self.commit.is_visible()
             || self.help.is_visible()
@@ -532,52 +319,6 @@ impl App {
         self.msg.draw(f, size);
     }
 
-    fn draw_status_tab<B: Backend>(
-        &self,
-        f: &mut Frame<B>,
-        area: Rect,
-    ) {
-        let chunks = Layout::default()
-            .direction(Direction::Horizontal)
-            .constraints(
-                if self.focus == Focus::Diff {
-                    [
-                        Constraint::Percentage(30),
-                        Constraint::Percentage(70),
-                    ]
-                } else {
-                    [
-                        Constraint::Percentage(50),
-                        Constraint::Percentage(50),
-                    ]
-                }
-                .as_ref(),
-            )
-            .split(area);
-
-        let left_chunks = Layout::default()
-            .direction(Direction::Vertical)
-            .constraints(
-                if self.diff_target == DiffTarget::WorkingDir {
-                    [
-                        Constraint::Percentage(60),
-                        Constraint::Percentage(40),
-                    ]
-                } else {
-                    [
-                        Constraint::Percentage(40),
-                        Constraint::Percentage(60),
-                    ]
-                }
-                .as_ref(),
-            )
-            .split(chunks[0]);
-
-        self.index_wd.draw(f, left_chunks[0]);
-        self.index.draw(f, left_chunks[1]);
-        self.diff.draw(f, chunks[1]);
-    }
-
     fn draw_commands<B: Backend>(
         f: &mut Frame<B>,
         r: Rect,
@@ -617,39 +358,4 @@ impl App {
             r,
         );
     }
-
-    fn switch_focus(&mut self, f: Focus) -> NeedsUpdate {
-        if self.focus == f {
-            NeedsUpdate::empty()
-        } else {
-            self.focus = f;
-
-            match self.focus {
-                Focus::WorkDir => {
-                    self.set_diff_target(DiffTarget::WorkingDir);
-                    self.diff.focus(false);
-                }
-                Focus::Stage => {
-                    self.set_diff_target(DiffTarget::Stage);
-                    self.diff.focus(false);
-                }
-                Focus::Diff => {
-                    self.index.focus(false);
-                    self.index_wd.focus(false);
-
-                    self.diff.focus(true);
-                }
-            };
-
-            NeedsUpdate::DIFF | NeedsUpdate::COMMANDS
-        }
-    }
-
-    fn set_diff_target(&mut self, target: DiffTarget) {
-        self.diff_target = target;
-        let is_stage = self.diff_target == DiffTarget::Stage;
-
-        self.index_wd.focus_select(!is_stage);
-        self.index.focus_select(is_stage);
-    }
 }
diff --git a/src/components/mod.rs b/src/components/mod.rs
index 5193260e..dd3ea927 100644
--- a/src/components/mod.rs
+++ b/src/components/mod.rs
@@ -19,6 +19,38 @@ pub use help::HelpComponent;
 pub use msg::MsgComponent;
 pub use reset::ResetComponent;
 
+/// allows generating code to make sure
+/// we always enumerate all components in both getter functions
+#[macro_export]
+macro_rules! accessors {
+    ($self:ident, [$($element:ident),+]) => {
+        fn components(& $self) -> Vec<&dyn Component> {
+            vec![
+                $(&$self.$element,)+
+            ]
+        }
+
+        fn components_mut(&mut $self) -> Vec<&mut dyn Component> {
+            vec![
+                $(&mut $self.$element,)+
+            ]
+        }
+    };
+}
+
+pub fn event_pump(
+    ev: Event,
+    components: &mut [&mut dyn Component],
+) -> bool {
+    for c in components {
+        if c.event(ev) {
+            return true;
+        }
+    }
+
+    false
+}
+
 #[derive(Copy, Clone)]
 pub enum ScrollType {
     Up,
diff --git a/src/components/reset.rs b/src/components/reset.rs
index d161ca02..491a7c08 100644
--- a/src/components/reset.rs
+++ b/src/components/reset.rs
@@ -7,7 +7,7 @@ use crate::{
     strings, ui,
 };
 
-use crossterm::event::{Event, KeyCode};
+use crossterm::event::{Event, KeyCode, KeyModifiers};
 use std::borrow::Cow;
 use strings::commands;
 use tui::{
@@ -74,16 +74,24 @@ impl Component for ResetComponent {
         if self.visible {
             if let Event::Key(e) = ev {
                 return match e.code {
+                    KeyCode::Char(c) => {
+                        // ignore and early out on ctrl+c
+                        !(c == 'c'
+                            && e.modifiers
+                                .contains(KeyModifiers::CONTROL))
+                    }
+
                     KeyCode::Esc => {
                         self.hide();
                         true
                     }
+
                     KeyCode::Enter => {
                         self.confirm();
                         true
                     }
 
-                    _ => false,
+                    _ => true,
                 };
             }
         }
diff --git a/src/tabs/mod.rs b/src/tabs/mod.rs
index 5312baeb..c2054113 100644
--- a/src/tabs/mod.rs
+++ b/src/tabs/mod.rs
@@ -1,5 +1,5 @@
 mod revlog;
-
-//TODO: tab traits?
+mod status;
 
 pub use revlog::Revlog;
+pub use status::Status;
diff --git a/src/tabs/revlog.rs b/src/tabs/revlog/mod.rs
index 53bd0610..6a49878d 100644
--- a/src/tabs/revlog.rs
+++ b/src/tabs/revlog/mod.rs
@@ -1,3 +1,5 @@
+mod utils;
+
 use crate::{
     components::{
         CommandBlocking, CommandInfo, Component, ScrollType,
@@ -6,11 +8,10 @@ use crate::{
     strings::commands,
 };
 use asyncgit::{sync, AsyncLog, AsyncNotification, CWD};
-use chrono::prelude::*;
 use crossbeam_channel::Sender;
 use crossterm::event::Event;
 use std::{borrow::Cow, cmp, convert::TryFrom, time::Instant};
-use sync::{CommitInfo, Tags};
+use sync::Tags;
 use tui::{
     backend::Backend,
     layout::{Alignment, Rect},
@@ -18,30 +19,7 @@ use tui::{
     widgets::{Block, Borders, Paragraph, Text},
     Frame,
 };
-
-#[derive(Default)]
-struct LogEntry {
-    time: String,
-    author: String,
-    msg: String,
-    hash: String,
-}
-
-impl From<CommitInfo> for LogEntry {
-    fn from(c: CommitInfo) -> Self {
-        let time =
-            DateTime::<Local>::from(DateTime::<Utc>::from_utc(
-                NaiveDateTime::from_timestamp(c.time, 0),
-                Utc,
-            ));
-        Self {
-            author: c.author,
-            msg: c.message,
-            time: time.format("%Y-%m-%d %H:%M:%S").to_string(),
-            hash: c.hash,
-        }
-    }
-}
+use utils::{ItemBatch, LogEntry};
 
 const COLOR_SELECTION_BG: Color = Color::Blue;
 
@@ -64,42 +42,6 @@ const STYLE_MSG_SELECTED: Style =
 
 static ELEMENTS_PER_LINE: usize = 10;
 static SLICE_SIZE: usize = 1200;
-static SLICE_OFFSET_RELOAD_THRESHOLD: usize = 100;
-
-///
-#[derive(Default)]
-struct ItemBatch {
-    index_offset: usize,
-    items: Vec<LogEntry>,
-}
-
-impl ItemBatch {
-    fn last_idx(&self) -> usize {
-        self.index_offset + self.items.len()
-    }
-
-    fn set_items(
-        &mut self,
-        start_index: usize,
-        commits: Vec<CommitInfo>,
-    ) {
-        self.items.clear();
-        self.items.extend(commits.into_iter().map(LogEntry::from));
-        self.index_offset = start_index;
-    }
-
-    fn needs_data(&self, idx: usize, idx_max: usize) -> bool {
-        let want_min =
-            idx.saturating_sub(SLICE_OFFSET_RELOAD_THRESHOLD);
-        let want_max = idx
-            .saturating_add(SLICE_OFFSET_RELOAD_THRESHOLD)
-            .min(idx_max);
-
-        let needs_data_top = want_min < self.index_offset;
-        let needs_data_bottom = want_max > self.last_idx();
-        needs_data_bottom || needs_data_top
-    }
-}
 
 ///
 pub struct Revlog {
@@ -320,26 +262,28 @@ impl Revlog {
 
 impl Component for Revlog {
     fn event(&mut self, ev: Event) -> bool {
-        if let Event::Key(k) = ev {
-            return match k {
-                keys::MOVE_UP => {
-                    self.move_selection(ScrollType::Up);
-                    true
-                }
-                keys::MOVE_DOWN => {
-                    self.move_selection(ScrollType::Down);
-                    true
-                }
-                keys::SHIFT_UP | keys::HOME => {
-                    self.move_selection(ScrollType::Home);
-                    true
-                }
-                keys::SHIFT_DOWN | keys::END => {
-                    self.move_selection(ScrollType::End);
-                    true
-                }
-                _ => false,
-            };
+        if self.visible {
+            if let Event::Key(k) = ev {
+                return match k {
+                    keys::MOVE_UP => {
+                        self.move_selection(ScrollType::Up);
+                        true
+                    }
+                    keys::MOVE_DOWN => {
+                        self.move_selection(ScrollType::Down);
+                        true
+                    }
+                    keys::SHIFT_UP | keys::HOME => {
+                        self.move_selection(ScrollType::Home);
+                        true
+                    }
+                    keys::SHIFT_DOWN | keys::END => {
+                        self.move_selection(ScrollType::End);
+                        true
+                    }
+                    _ => false,
+                };
+            }
         }
 
         false
@@ -356,7 +300,11 @@ impl Component for Revlog {
             self.visible || force_all,
         ));
 
-        CommandBlocking::PassingOn
+        if self.visible {
+            CommandBlocking::Blocking
+        } else {
+            CommandBlocking::PassingOn
+        }
     }
 
     fn is_visible(&self) -> bool {
diff --git a/src/tabs/revlog/utils.rs b/src/tabs/revlog/utils.rs
new file mode 100644
index 00000000..5a40f1e8
--- /dev/null
+++ b/src/tabs/revlog/utils.rs
@@ -0,0 +1,63 @@
+use asyncgit::sync::CommitInfo;
+use chrono::prelude::*;
+
+static SLICE_OFFSET_RELOAD_THRESHOLD: usize = 100;
+
+#[derive(Default)]
+pub(super) struct LogEntry {
+    pub time: String,
+    pub author: String,
+    pub msg: String,
+    pub hash: String,
+}
+
+impl From<CommitInfo> for LogEntry {
+    fn from(c: CommitInfo) -> Self {
+        let time =
+            DateTime::<Local>::from(DateTime::<Utc>::from_utc(
+                NaiveDateTime::from_timestamp(c.time, 0),
+                Utc,
+            ));
+        Self {
+            author: c.author,
+            msg: c.message,
+            time: time.format("%Y-%m-%d %H:%M:%S").to_string(),
+            hash: c.hash,
+        }
+    }
+}
+
+///
+#[derive(Default)]
+pub(super) struct ItemBatch {
+    pub index_offset: usize,
+    pub items: Vec<LogEntry>,
+}
+
+impl ItemBatch {
+    fn last_idx(&self) -> usize {
+        self.index_offset + self.items.len()
+    }
+
+    pub fn set_items(
+        &mut self,
+        start_index: usize,
+        commits: Vec<CommitInfo>,
+    ) {
+        self.items.clear();
+        self.items.extend(commits.into_iter().map(LogEntry::from));
+        self.index_offset = start_index;
+    }
+
+    pub fn needs_data(&self, idx: usize, idx_max: usize) -> bool {
+        let want_min =
+            idx.saturating_sub(SLICE_OFFSET_RELOAD_THRESHOLD);
+        let want_max = idx
+            .saturating_add(SLICE_OFFSET_RELOAD_THRESHOLD)
+            .min(idx_max);
+
+        let needs_data_top = want_min < self.index_offset;
+        let needs_data_bottom = want_max > self.last_idx();
+        needs_data_bottom || needs_data_top
+    }
+}
diff --git a/src/tabs/status.rs b/src/tabs/status.rs
new file mode 100644
index 00000000..f065cc80
--- /dev/null
+++ b/src/tabs/status.rs
@@ -0,0 +1,368 @@
+use crate::{
+    accessors,
+    components::{
+        event_pump, ChangesComponent, CommandBlocking, CommandInfo,
+        Component, DiffComponent, DrawableComponent,
+        FileTreeItemKind,
+    },
+    keys,
+    queue::Queue,
+    strings,
+};
+use asyncgit::{
+    current_tick, AsyncDiff, AsyncNotification, AsyncStatus,
+    DiffParams,
+};
+use crossbeam_channel::Sender;
+use crossterm::event::Event;
+use strings::commands;
+use tui::layout::{Constraint, Direction, Layout};
+
+///
+#[derive(PartialEq)]
+enum Focus {
+    WorkDir,
+    Diff,
+    Stage,
+}
+
+///
+#[derive(PartialEq, Copy, Clone)]
+enum DiffTarget {
+    Stage,
+    WorkingDir,
+}
+
+pub struct Status {
+    visible: bool,
+    focus: Focus,
+    diff_target: DiffTarget,
+    index: ChangesComponent,
+    index_wd: ChangesComponent,
+    diff: DiffComponent,
+    git_diff: AsyncDiff,
+    git_status: AsyncStatus,
+}
+
+impl DrawableComponent for Status {
+    fn draw<B: tui::backend::Backend>(
+        &self,
+        f: &mut tui::Frame<B>,
+        rect: tui::layout::Rect,
+    ) {
+        let chunks = Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints(
+                if self.focus == Focus::Diff {
+                    [
+                        Constraint::Percentage(30),
+                        Constraint::Percentage(70),
+                    ]
+                } else {
+                    [
+                        Constraint::Percentage(50),
+                        Constraint::Percentage(50),
+                    ]
+                }
+                .as_ref(),
+            )
+            .split(rect);
+
+        let left_chunks = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints(
+                if self.diff_target == DiffTarget::WorkingDir {
+                    [
+                        Constraint::Percentage(60),
+                        Constraint::Percentage(40),
+                    ]
+                } else {
+                    [
+                        Constraint::Percentage(40),
+                        Constraint::Percentage(60),
+                    ]
+                }
+                .as_ref(),
+            )
+            .split(chunks[0]);
+
+        self.index_wd.draw(f, left_chunks[0]);
+        self.index.draw(f, left_chunks[1]);
+        self.diff.draw(f, chunks[1]);
+    }
+}
+
+impl Status {
+    accessors!(self, [index, index_wd, diff]);
+
+    ///
+    pub fn new(
+        sender: &Sender<AsyncNotification>,
+        queue: &Queue,
+    ) -> Self {
+        Self {
+            visible: true,
+            focus: Focus::WorkDir,
+            diff_target: DiffTarget::WorkingDir,
+            index_wd: ChangesComponent::new(
+                strings::TITLE_STATUS,
+                true,
+                true,
+                queue.clone(),
+            ),
+            index: ChangesComponent::new(
+                strings::TITLE_INDEX,
+                false,
+                false,
+                queue.clone(),
+            ),
+            diff: DiffComponent::new(queue.clone()),
+            git_diff: AsyncDiff::new(sender.clone()),
+            git_status: AsyncStatus::new(sender.clone()),
+        }
+    }
+
+    fn can_focus_diff(&self) -> bool {
+        match self.focus {
+            Focus::WorkDir => self.index_wd.is_file_seleted(),
+            Focus::Stage => self.index.is_file_seleted(),
+            _ => false,
+        }
+    }
+
+    //TODO: unpub
+    pub fn offer_open_commit_cmd(&self) -> bool {
+        self.visible
+            && self.diff_target == DiffTarget::Stage
+            && !self.index.is_empty()
+    }
+
+    fn switch_focus(&mut self, f: Focus) -> bool {
+        if self.focus != f {
+            self.focus = f;
+
+            match self.focus {
+                Focus::WorkDir => {
+                    self.set_diff_target(DiffTarget::WorkingDir);
+                    self.diff.focus(false);
+                }
+                Focus::Stage => {
+                    self.set_diff_target(DiffTarget::Stage);
+                    self.diff.focus(false);
+                }
+                Focus::Diff => {
+                    self.index.focus(false);
+                    self.index_wd.focus(false);
+
+                    self.diff.focus(true);
+                }