add(plugin): `compact-bar` & `compact` layout (#1450)

* add(plugin): `compact-bar` & `compact` layout

* add(nix): `compact-bar` plugin

* add(config): `compact-bar` to the config

* add(workspace): `compact-bar` to workspace members

* add(assets): `compact-bar`

* chore(fmt): rustfmt

* add(nix): add `compact-bar`

* add: compact layout to dump command

* nix(build): fix destination of copy command

* add(makefile): add `compact-bar` to `plugin-build`

* add(layout): `compact-bar` to layout

* add: install `compact-bar` plugin

* fix(test): update input plugin test

* fix(plugin): default colors for compact-bar

6 files changed, 480 insertions, 0 deletions

diff --git a/default-plugins/compact-bar/.cargo/config.toml b/default-plugins/compact-bar/.cargo/config.toml
new file mode 100644
index 000000000..6b77899cb
--- /dev/null
+++ b/default-plugins/compact-bar/.cargo/config.toml
@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-wasi"
diff --git a/default-plugins/compact-bar/Cargo.toml b/default-plugins/compact-bar/Cargo.toml
new file mode 100644
index 000000000..6f45e2c40
--- /dev/null
+++ b/default-plugins/compact-bar/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "compact-bar"
+version = "0.1.0"
+authors = ["Alexander Kenji Berthold <aks.kenji@protonmail.com>" ]
+edition = "2021"
+license = "MIT"
+
+[dependencies]
+colored = "2"
+ansi_term = "0.12"
+unicode-width = "0.1.8"
+zellij-tile = { path = "../../zellij-tile" }
+zellij-tile-utils = { path = "../../zellij-tile-utils" }
diff --git a/default-plugins/compact-bar/LICENSE.md b/default-plugins/compact-bar/LICENSE.md
new file mode 120000
index 000000000..f0608a63a
--- /dev/null
+++ b/default-plugins/compact-bar/LICENSE.md
@@ -0,0 +1 @@
+../../LICENSE.md
\ No newline at end of file
diff --git a/default-plugins/compact-bar/src/line.rs b/default-plugins/compact-bar/src/line.rs
new file mode 100644
index 000000000..5cd9c6873
--- /dev/null
+++ b/default-plugins/compact-bar/src/line.rs
@@ -0,0 +1,243 @@
+use ansi_term::ANSIStrings;
+use unicode_width::UnicodeWidthStr;
+
+use crate::{LinePart, ARROW_SEPARATOR};
+use zellij_tile::prelude::*;
+use zellij_tile_utils::style;
+
+fn get_current_title_len(current_title: &[LinePart]) -> usize {
+    current_title.iter().map(|p| p.len).sum()
+}
+
+// move elements from before_active and after_active into tabs_to_render while they fit in cols
+// adds collapsed_tabs to the left and right if there's left over tabs that don't fit
+fn populate_tabs_in_tab_line(
+    tabs_before_active: &mut Vec<LinePart>,
+    tabs_after_active: &mut Vec<LinePart>,
+    tabs_to_render: &mut Vec<LinePart>,
+    cols: usize,
+    palette: Palette,
+    capabilities: PluginCapabilities,
+) {
+    let mut middle_size = get_current_title_len(tabs_to_render);
+
+    let mut total_left = 0;
+    let mut total_right = 0;
+    loop {
+        let left_count = tabs_before_active.len();
+        let right_count = tabs_after_active.len();
+        let collapsed_left = left_more_message(left_count, palette, tab_separator(capabilities));
+        let collapsed_right = right_more_message(right_count, palette, tab_separator(capabilities));
+
+        let total_size = collapsed_left.len + middle_size + collapsed_right.len;
+
+        if total_size > cols {
+            // break and dont add collapsed tabs to tabs_to_render, they will not fit
+            break;
+        }
+
+        let left = if let Some(tab) = tabs_before_active.last() {
+            tab.len
+        } else {
+            usize::MAX
+        };
+
+        let right = if let Some(tab) = tabs_after_active.first() {
+            tab.len
+        } else {
+            usize::MAX
+        };
+
+        // total size is shortened if the next tab to be added is the last one, as that will remove the collapsed tab
+        let size_by_adding_left =
+            left.saturating_add(total_size)
+                .saturating_sub(if left_count == 1 {
+                    collapsed_left.len
+                } else {
+                    0
+                });
+        let size_by_adding_right =
+            right
+                .saturating_add(total_size)
+                .saturating_sub(if right_count == 1 {
+                    collapsed_right.len
+                } else {
+                    0
+                });
+
+        let left_fits = size_by_adding_left <= cols;
+        let right_fits = size_by_adding_right <= cols;
+        // active tab is kept in the middle by adding to the side that
+        // has less width, or if the tab on the other side doesn' fit
+        if (total_left <= total_right || !right_fits) && left_fits {
+            // add left tab
+            let tab = tabs_before_active.pop().unwrap();
+            middle_size += tab.len;
+            total_left += tab.len;
+            tabs_to_render.insert(0, tab);
+        } else if right_fits {
+            // add right tab
+            let tab = tabs_after_active.remove(0);
+            middle_size += tab.len;
+            total_right += tab.len;
+            tabs_to_render.push(tab);
+        } else {
+            // there's either no space to add more tabs or no more tabs to add, so we're done
+            tabs_to_render.insert(0, collapsed_left);
+            tabs_to_render.push(collapsed_right);
+            break;
+        }
+    }
+}
+
+fn left_more_message(tab_count_to_the_left: usize, palette: Palette, separator: &str) -> LinePart {
+    if tab_count_to_the_left == 0 {
+        return LinePart::default();
+    }
+    let more_text = if tab_count_to_the_left < 10000 {
+        format!(" ← +{} ", tab_count_to_the_left)
+    } else {
+        " ← +many ".to_string()
+    };
+    // 238
+    // chars length plus separator length on both sides
+    let more_text_len = more_text.width() + 2 * separator.width();
+    let text_color = match palette.theme_hue {
+        ThemeHue::Dark => palette.white,
+        ThemeHue::Light => palette.black,
+    };
+    let left_separator = style!(text_color, palette.orange).paint(separator);
+    let more_styled_text = style!(text_color, palette.orange).bold().paint(more_text);
+    let right_separator = style!(palette.orange, text_color).paint(separator);
+    let more_styled_text =
+        ANSIStrings(&[left_separator, more_styled_text, right_separator]).to_string();
+    LinePart {
+        part: more_styled_text,
+        len: more_text_len,
+    }
+}
+
+fn right_more_message(
+    tab_count_to_the_right: usize,
+    palette: Palette,
+    separator: &str,
+) -> LinePart {
+    if tab_count_to_the_right == 0 {
+        return LinePart::default();
+    };
+    let more_text = if tab_count_to_the_right < 10000 {
+        format!(" +{} → ", tab_count_to_the_right)
+    } else {
+        " +many → ".to_string()
+    };
+    // chars length plus separator length on both sides
+    let more_text_len = more_text.width() + 2 * separator.width();
+    let text_color = match palette.theme_hue {
+        ThemeHue::Dark => palette.white,
+        ThemeHue::Light => palette.black,
+    };
+    let left_separator = style!(text_color, palette.orange).paint(separator);
+    let more_styled_text = style!(text_color, palette.orange).bold().paint(more_text);
+    let right_separator = style!(palette.orange, text_color).paint(separator);
+    let more_styled_text =
+        ANSIStrings(&[left_separator, more_styled_text, right_separator]).to_string();
+    LinePart {
+        part: more_styled_text,
+        len: more_text_len,
+    }
+}
+
+fn tab_line_prefix(
+    session_name: Option<&str>,
+    mode: InputMode,
+    palette: Palette,
+    cols: usize,
+) -> Vec<LinePart> {
+    let prefix_text = " Zellij ".to_string();
+
+    let prefix_text_len = prefix_text.chars().count();
+    let text_color = match palette.theme_hue {
+        ThemeHue::Dark => palette.white,
+        ThemeHue::Light => palette.black,
+    };
+    let bg_color = match palette.theme_hue {
+        ThemeHue::Dark => palette.black,
+        ThemeHue::Light => palette.white,
+    };
+    let prefix_styled_text = style!(text_color, bg_color).bold().paint(prefix_text);
+    let mut parts = vec![LinePart {
+        part: prefix_styled_text.to_string(),
+        len: prefix_text_len,
+    }];
+    if let Some(name) = session_name {
+        let name_part = format!("({}) ", name);
+        let name_part_len = name_part.width();
+        let text_color = match palette.theme_hue {
+            ThemeHue::Dark => palette.white,
+            ThemeHue::Light => palette.black,
+        };
+        let name_part_styled_text = style!(text_color, bg_color).bold().paint(name_part);
+        if cols.saturating_sub(prefix_text_len) >= name_part_len {
+            parts.push(LinePart {
+                part: name_part_styled_text.to_string(),
+                len: name_part_len,
+            })
+        }
+    }
+    let mode_part = format!("({:?})", mode);
+    let mode_part_len = mode_part.width();
+    let mode_part_styled_text = style!(text_color, bg_color).bold().paint(mode_part);
+    if cols.saturating_sub(prefix_text_len) >= mode_part_len {
+        parts.push(LinePart {
+            part: format!("({:^6})", mode_part_styled_text),
+            len: mode_part_len,
+        })
+    }
+    parts
+}
+
+pub fn tab_separator(capabilities: PluginCapabilities) -> &'static str {
+    if !capabilities.arrow_fonts {
+        ARROW_SEPARATOR
+    } else {
+        ""
+    }
+}
+
+pub fn tab_line(
+    session_name: Option<&str>,
+    mut all_tabs: Vec<LinePart>,
+    active_tab_index: usize,
+    cols: usize,
+    palette: Palette,
+    capabilities: PluginCapabilities,
+    mode: InputMode,
+) -> Vec<LinePart> {
+    let mut tabs_after_active = all_tabs.split_off(active_tab_index);
+    let mut tabs_before_active = all_tabs;
+    let active_tab = if !tabs_after_active.is_empty() {
+        tabs_after_active.remove(0)
+    } else {
+        tabs_before_active.pop().unwrap()
+    };
+    let mut prefix = tab_line_prefix(session_name, mode, palette, cols);
+    let prefix_len = get_current_title_len(&prefix);
+
+    // if active tab alone won't fit in cols, don't draw any tabs
+    if prefix_len + active_tab.len > cols {
+        return prefix;
+    }
+
+    let mut tabs_to_render = vec![active_tab];
+
+    populate_tabs_in_tab_line(
+        &mut tabs_before_active,
+        &mut tabs_after_active,
+        &mut tabs_to_render,
+        cols.saturating_sub(prefix_len),
+        palette,
+        capabilities,
+    );
+    prefix.append(&mut tabs_to_render);
+    prefix
+}
diff --git a/default-plugins/compact-bar/src/main.rs b/default-plugins/compact-bar/src/main.rs
new file mode 100644
index 000000000..3e5e4a184
--- /dev/null
+++ b/default-plugins/compact-bar/src/main.rs
@@ -0,0 +1,137 @@
+mod line;
+mod tab;
+
+use std::cmp::{max, min};
+use std::convert::TryInto;
+
+use zellij_tile::prelude::*;
+
+use crate::line::tab_line;
+use crate::tab::tab_style;
+
+#[derive(Debug, Default)]
+pub struct LinePart {
+    part: String,
+    len: usize,
+}
+
+#[derive(Default)]
+struct State {
+    tabs: Vec<TabInfo>,
+    active_tab_idx: usize,
+    mode_info: ModeInfo,
+    mouse_click_pos: usize,
+    should_render: bool,
+}
+
+static ARROW_SEPARATOR: &str = "";
+
+register_plugin!(State);
+
+impl ZellijPlugin for State {
+    fn load(&mut self) {
+        set_selectable(false);
+        subscribe(&[
+            EventType::TabUpdate,
+            EventType::ModeUpdate,
+            EventType::Mouse,
+        ]);
+    }
+
+    fn update(&mut self, event: Event) {
+        match event {
+            Event::ModeUpdate(mode_info) => self.mode_info = mode_info,
+            Event::TabUpdate(tabs) => {
+                if let Some(active_tab_index) = tabs.iter().position(|t| t.active) {
+                    // tabs are indexed starting from 1 so we need to add 1
+                    self.active_tab_idx = active_tab_index + 1;
+                    self.tabs = tabs;
+                } else {
+                    eprintln!("Could not find active tab.");
+                }
+            }
+            Event::Mouse(me) => match me {
+                Mouse::LeftClick(_, col) => {
+                    self.mouse_click_pos = col;
+                    self.should_render = true;
+                }
+                Mouse::ScrollUp(_) => {
+                    switch_tab_to(min(self.active_tab_idx + 1, self.tabs.len()) as u32);
+                }
+                Mouse::ScrollDown(_) => {
+                    switch_tab_to(max(self.active_tab_idx.saturating_sub(1), 1) as u32);
+                }
+                _ => {}
+            },
+            _ => {
+                eprintln!("Got unrecognized event: {:?}", event);
+            }
+        }
+    }
+
+    fn render(&mut self, _rows: usize, cols: usize) {
+        if self.tabs.is_empty() {
+            return;
+        }
+        let mut all_tabs: Vec<LinePart> = vec![];
+        let mut active_tab_index = 0;
+        for t in &mut self.tabs {
+            let mut tabname = t.name.clone();
+            if t.active && self.mode_info.mode == InputMode::RenameTab {
+                if tabname.is_empty() {
+                    tabname = String::from("Enter name...");
+                }
+                active_tab_index = t.position;
+            } else if t.active {
+                active_tab_index = t.position;
+            }
+            let tab = tab_style(
+                tabname,
+                t.active,
+                t.is_sync_panes_active,
+                self.mode_info.style.colors,
+                self.mode_info.capabilities,
+                t.other_focused_clients.as_slice(),
+            );
+            all_tabs.push(tab);
+        }
+        let tab_line = tab_line(
+            self.mode_info.session_name.as_deref(),
+            all_tabs,
+            active_tab_index,
+            cols.saturating_sub(1),
+            self.mode_info.style.colors,
+            self.mode_info.capabilities,
+            self.mode_info.mode,
+        );
+        let mut s = String::new();
+        let mut len_cnt = 0;
+        for (idx, bar_part) in tab_line.iter().enumerate() {
+            s = format!("{}{}", s, &bar_part.part);
+
+            if self.should_render
+                && self.mouse_click_pos > len_cnt
+                && self.mouse_click_pos <= len_cnt + bar_part.len
+                && idx > 2
+            {
+                // First three elements of tab_line are "Zellij", session name and empty thing, hence the idx > 2 condition.
+                // Tabs are indexed starting from 1, therefore we need subtract 2 below.
+                switch_tab_to(TryInto::<u32>::try_into(idx).unwrap() - 2);
+            }
+            len_cnt += bar_part.len;
+        }
+        let background = match self.mode_info.style.colors.theme_hue {
+            ThemeHue::Dark => self.mode_info.style.colors.black,
+            ThemeHue::Light => self.mode_info.style.colors.white,
+        };
+        match background {
+            PaletteColor::Rgb((r, g, b)) => {
+                println!("{}\u{1b}[48;2;{};{};{}m\u{1b}[0K", s, r, g, b);
+            }
+            PaletteColor::EightBit(color) => {
+                println!("{}\u{1b}[48;5;{}m\u{1b}[0K", s, color);
+            }
+        }
+        self.should_render = false;
+    }
+}
diff --git a/default-plugins/compact-bar/src/tab.rs b/default-plugins/compact-bar/src/tab.rs
new file mode 100644
index 000000000..993489620
--- /dev/null
+++ b/default-plugins/compact-bar/src/tab.rs
@@ -0,0 +1,84 @@
+use crate::{line::tab_separator, LinePart};
+use ansi_term::{ANSIString, ANSIStrings};
+use unicode_width::UnicodeWidthStr;
+use zellij_tile::prelude::*;
+use zellij_tile_utils::style;
+
+fn cursors(focused_clients: &[ClientId], palette: Palette) -> (Vec<ANSIString>, usize) {
+    // cursor section, text length
+    let mut len = 0;
+    let mut cursors = vec![];
+    for client_id in focused_clients.iter() {
+        if let Some(color) = client_id_to_colors(*client_id, palette) {
+            cursors.push(style!(color.1, color.0).paint(" "));
+            len += 1;
+        }
+    }
+    (cursors, len)
+}
+
+pub fn render_tab(
+    text: String,
+    palette: Palette,
+    separator: &str,
+    focused_clients: &[ClientId],
+    active: bool,
+) -> LinePart {
+    let background_color = if active { palette.green } else { palette.fg };
+    let foreground_color = match palette.theme_hue {
+        ThemeHue::Dark => palette.black,
+        ThemeHue::Light => palette.white,
+    };
+    let left_separator = style!(foreground_color, background_color).paint(separator);
+    let mut tab_text_len = text.width() + 2 + separator.width() * 2; // 2 for left and right separators, 2 for the text padding
+
+    let tab_styled_text = style!(foreground_color, background_color)
+        .bold()
+        .paint(format!(" {} ", text));
+
+    let right_separator = style!(background_color, foreground_color).paint(separator);
+    let tab_styled_text = if !focused_clients.is_empty() {
+        let (cursor_section, extra_length) = cursors(focused_clients, palette);
+        tab_text_len += extra_length;
+        let mut s = String::new();
+        let cursor_beginning = style!(foreground_color, background_color)
+            .bold()
+            .paint("[")
+            .to_string();
+        let cursor_section = ANSIStrings(&cursor_section).to_string();
+        let cursor_end = style!(foreground_color, background_color)
+            .bold()
+            .paint("]")
+            .to_string();
+        s.push_str(&left_separator.to_string());
+        s.push_str(&tab_styled_text.to_string());
+        s.push_str(&cursor_beginning);
+        s.push_str(&cursor_section);
+        s.push_str(&cursor_end);
+        s.push_str(&right_separator.to_string());
+        s
+    } else {
+        ANSIStrings(&[left_separator, tab_styled_text, right_separator]).to_string()
+    };
+
+    LinePart {
+        part: tab_styled_text,
+        len: tab_text_len,
+    }
+}
+
+pub fn tab_style(
+    text: String,
+    is_active_tab: bool,
+    is_sync_panes_active: bool,
+    palette: Palette,
+    capabilities: PluginCapabilities,
+    focused_clients: &[ClientId],
+) -> LinePart {
+    let separator = tab_separator(capabilities);
+    let mut tab_text = text;
+    if is_sync_panes_active {
+        tab_text.push_str(" (Sync)");
+    }
+    render_tab(tab_text, palette, separator, focused_clients, is_active_tab)
+}