feat: from simple keybindings to commands like in vim

README.md

@@ -1,22 +1,8 @@
 # dot-viewer
-dot debugger in TUI
 
-# 1. Motivations
+`dot-viewer` is a dot-format graph debugger in TUI, inspired by Vim.
 
-커다란 graph를 전부 다 visualize 할 수 없음
-
-- graphviz, xdot, netron와 같은 graph visualizer들이 있지만, node 개수가 수천 개가 넘어가면 rendering 시간이 오래 걸림
-- rendering에 성공한다 하더라도, graph 크기가 너무 커서 직관적으로 보기 어려움
-
-# 2. Overview
-
-커다란 graph를 효율적으로 다루고 디버깅할 수 있는 dot-viewer 툴 구현
-
-- dot format의 전체 graph를 input으로 받아서,
-- TUI로 전체 graph를 탐색하고,
-- (visualize 하기에 충분히 작은) 특정 subgraph만 선택하여 dot format으로 export
-
-# 3. Getting Started
+# 1. Getting Started
 
 ## a. Prerequisites
 
@@ -61,6 +47,14 @@ It is required that [xdot is executable in command-line](https://github.com/jrfo
 $ xdot *.dot
 ```
 
+### iii. Others
+
+Coming from Linux, the followings are necessary for `bindgen` to make bindings to Graphviz.
+```console
+$ sudo apt install build-essentials cmake
+$ sudo apt install clang
+```
+
 ## b. Installation
 
 ### i. Initialize
@@ -82,61 +76,82 @@ $ cargo run --release [path-to-dot-file]
 
 This will open a TUI screen on the terminal.
 
-# 4. Feature Demo
+# 2. Features
 
 With `dot-viewer`, users may
 
 **traverse the graph in TUI** using,
 - goto next/prev node of the currently selected node
 - fuzzy search on node name
 - regex search on node name and attributes
-  
+
 
 **make and export subgraphs** using,
 - subgraph tree selection
-- prefix filtering on node names
+- applying filter on search matches
 - neighboring `n` nodes of the currently selected node
 
 ## Keybindings
 
 ### General
 
-Key | Actions
---- | ---
-`q` | quit
-`?` | show help
-`esc ` | go back to the main screen
-`c` | close the current tab (except for the root tab)
+Key | Command | Actions
+--- | --- | ---
+`q` | | quit `dot-viewer`
+. | `:help<CR>` | show help
+`esc` | . | go back to the main screen
 
-### Navigation
+### Mode Switches
 
-Key | Mode | Actions
+Key | From | To
 --- | --- | ---
-`tab`/`backtab` | `Nav` | move between tabs
-`up` | `Nav`/`Search` | traverse the focused node list
-`down` | `Nav`/`Search` | traverse the focused node list
-`right` | `Nav` | move focus between lists (highlighted in yellow borders)
-`left` | `Nav` | move focus between lists (highlighted in yellow borders)
+`esc` | All | Normal
+`/` | Normal | Fuzzy Search
+`r` | Normal | Regex Search
+`:` | Normal | Command
 
-### Mode Switch
+### Normal
 
-Key | Mode | Actions
---- | --- | ---
-`/` | `Nav` | switch to fuzzy `Search` mode (`/[node-id-pattern]`)
-`r` | `Nav` | switch to regex `Search` mode (`r[node-attr-regex]`)
-`f` | `Nav` | switch to prefix `Filter` mode (`f[node-id-prefix]`)
-`s` | `Nav` | switch to subgraph `Popup` mode
-`enter` | `Nav`/`Search` | go to the selected node
---- | `Filter` | apply entered prefix (opens a new tab)
---- | `Subgraph` | extract selected subgraph (opens a new tab)
+Key | Actions
+--- | ---
+`c` | close the current tab(view)
+`h/l` | move focus between current, prevs, nexts list
+`j/k` | traverse in focused list
+`n/N` | move between matched nodes
+`tab`/`backtab` | move between tabs
+
+### Search
+Key | Actions
+--- | ---
+`tab` | autocomplete search keyword
+`enter` | apply search
 
-### Exporting
+e.g., in fuzzy search mode, `/g1_s14_t100` and in regex search mode, `r\(H: ., D: .\)`
 
-Key | Mode | Actions
+### Command
+
+Key | Command | Actions
 --- | --- | ---
-`e` | `Nav` | export the current tab to dot
-`0-9` | `Nav` | export the subgraph containing neighbors of the current node with given depth
-`x` | `Nav` | launch xdot, showing `./exports/current.dot`
+. | `filter` | apply filter on current matches, opening a new tab(view)
+. | `neighbors [depth]` | get up to `depth` neighbors of the current node in a new tab(view)
+. | `export [(opt) filename]` | export the current tab(view) to dot
+. | `xdot [(opt) filename]` | launch `xdot` with the filename or `exports/current.dot` by default
+. | `subgraph` | open a popup showing subgraph tree
+`enter` | . | execute command
 
 All exported files are saved in `exports` directory in the project root.
+
 Most recently exported file is copied in `exports/current.dot`.
+
+### Subgraph Popup
+
+Key | Actions
+--- | ---
+`h/j/k/l` | traverse the tree
+`enter` | change root to the selected subgraph, opening a new tab(view)
+
+### Help Popup
+
+Key | Actions
+--- | ---
+`h/j/k/l` | traverse help messages

src/terminal.rs

@@ -15,6 +15,7 @@ use tui::{
 };
 
 pub fn launch(path: String) -> Result<(), Box<dyn Error>> {
+    // setup terminal
     let mut terminal = setup()?;
 
     // create and run app
@@ -25,6 +26,7 @@ pub fn launch(path: String) -> Result<(), Box<dyn Error>> {
     })?;
     let _ = run(&mut terminal, app);
 
+    // restore terminal
     cleanup()?;
 
     Ok(())
@@ -37,6 +39,7 @@ fn setup() -> Result<Terminal<CrosstermBackend<Stdout>>, Box<dyn Error>> {
     let backend = CrosstermBackend::new(stdout);
     let terminal = Terminal::new(backend)?;
 
+    // setup panic hook to ensure that the terminal is restored even on panics
     setup_panic_hook();
 
     Ok(terminal)

src/ui/app.rs

@@ -1,5 +1,5 @@
 use crate::ui::{input::draw_input, popup::draw_popup, tabs::draw_tabs};
-use crate::viewer::{App, MainMode, Mode};
+use crate::viewer::{App, Mode};
 
 use tui::{
     backend::Backend,
@@ -11,26 +11,26 @@ use tui::{
 pub(crate) fn draw_app<B: Backend>(f: &mut Frame<B>, app: &mut App) {
     let size = f.size();
 
-    // surrounding block
     let block = Block::default()
         .borders(Borders::ALL)
         .title("Dot Viewer (Dev)")
         .title_alignment(Alignment::Center)
         .border_type(BorderType::Rounded);
+
     f.render_widget(block, size);
 
     match &app.mode {
-        Mode::Main(mmode) => draw_main(f, size, &mmode.clone(), app),
-        Mode::Popup(pmode) => draw_popup(f, size, &pmode.clone(), app),
+        Mode::Normal | Mode::Command | Mode::Search(_) => draw_main(f, size, app),
+        Mode::Popup(_) => draw_popup(f, size, app),
     }
 }
 
-fn draw_main<B: Backend>(f: &mut Frame<B>, size: Rect, mode: &MainMode, app: &mut App) {
+fn draw_main<B: Backend>(f: &mut Frame<B>, size: Rect, app: &mut App) {
     let chunks = Layout::default()
         .direction(Direction::Vertical)
         .constraints([Constraint::Percentage(90), Constraint::Percentage(10)].as_ref())
         .split(size);
 
-    draw_tabs(f, chunks[0], mode, app);
-    draw_input(f, chunks[1], mode, app);
+    draw_tabs(f, chunks[0], app);
+    draw_input(f, chunks[1], app);
 }

src/ui/input.rs

@@ -1,69 +1,42 @@
 use crate::ui::surrounding_block;
-use crate::viewer::{App, InputMode, MainMode, SearchMode};
+use crate::viewer::{App, Mode, SearchMode};
 
 use tui::{
     backend::Backend,
     layout::{Constraint, Direction, Layout, Rect},
     style::{Color, Modifier, Style},
-    text::{Span, Spans, Text},
     widgets::Paragraph,
     Frame,
 };
 
-// input block
-pub(super) fn draw_input<B: Backend>(
-    f: &mut Frame<B>,
-    chunk: Rect,
-    mmode: &MainMode,
-    app: &mut App,
-) {
-    // surrounding block
-    let title = match mmode {
-        MainMode::Navigate(_) => "Navigate",
-        MainMode::Input(imode) => match imode {
-            InputMode::Search(smode) => match smode {
-                SearchMode::Fuzzy => "Fuzzy Search",
-                SearchMode::Regex => "Regex Search",
-            },
-            InputMode::Filter => "Filter",
+pub(super) fn draw_input<B: Backend>(f: &mut Frame<B>, chunk: Rect, app: &mut App) {
+    let title = match &app.mode {
+        Mode::Normal => "Normal",
+        Mode::Command => "Command",
+        Mode::Search(smode) => match smode {
+            SearchMode::Fuzzy => "Fuzzy Search",
+            SearchMode::Regex => "Regex Search",
         },
+        _ => unreachable!(),
     };
 
-    let block = surrounding_block(title.to_string(), matches!(mmode, MainMode::Input(_)));
+    let block = surrounding_block(
+        title.to_string(),
+        matches!(app.mode, Mode::Command) || matches!(app.mode, Mode::Search(_)),
+    );
 
     f.render_widget(block, chunk);
 
-    // inner blocks
     let chunks = Layout::default()
         .direction(Direction::Vertical)
         .margin(1)
         .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
         .split(chunk);
-    draw_help(f, chunks[0]);
-    match mmode {
-        MainMode::Navigate(_) => draw_error(f, chunks[1], app),
-        MainMode::Input(_) => draw_form(f, chunks[1], mmode, app),
-    };
-}
-
-// help block
-fn draw_help<B: Backend>(f: &mut Frame<B>, chunk: Rect) {
-    let text = vec![
-        Span::raw("Press "),
-        Span::styled("?", Style::default().fg(Color::Red).add_modifier(Modifier::BOLD)),
-        Span::raw(" for help. "),
-        Span::raw("Press "),
-        Span::styled("q", Style::default().fg(Color::Red).add_modifier(Modifier::BOLD)),
-        Span::raw(" to exit"),
-    ];
-    let mut text = Text::from(Spans::from(text));
-    text.patch_style(Style::default().add_modifier(Modifier::RAPID_BLINK));
 
-    let help = Paragraph::new(text);
-    f.render_widget(help, chunk);
+    draw_error(f, chunks[0], app);
+    draw_form(f, chunks[1], app);
 }
 
-// error block
 fn draw_error<B: Backend>(f: &mut Frame<B>, chunk: Rect, app: &mut App) {
     let msg = match &app.result {
         Ok(succ) => succ.to_string(),
@@ -77,17 +50,18 @@ fn draw_error<B: Backend>(f: &mut Frame<B>, chunk: Rect, app: &mut App) {
     }
 }
 
-// input block
-fn draw_form<B: Backend>(f: &mut Frame<B>, chunk: Rect, mmode: &MainMode, app: &mut App) {
-    let input = Paragraph::new(app.input.key.clone()).style(match mmode {
-        MainMode::Navigate(_) => Style::default(),
-        MainMode::Input(_) => Style::default().fg(Color::Yellow),
+fn draw_form<B: Backend>(f: &mut Frame<B>, chunk: Rect, app: &mut App) {
+    let input = Paragraph::new(app.input.key.clone()).style(match &app.mode {
+        Mode::Normal => Style::default(),
+        Mode::Command | Mode::Search(_) => Style::default().fg(Color::Yellow),
+        _ => unreachable!(),
     });
     f.render_widget(input, chunk);
 
     // cursor
-    match mmode {
-        MainMode::Navigate(_) => {}
-        MainMode::Input(_) => f.set_cursor(chunk.x + app.input.cursor as u16, chunk.y),
+    match &app.mode {
+        Mode::Normal => {}
+        Mode::Command | Mode::Search(_) => f.set_cursor(chunk.x + app.input.cursor as u16, chunk.y),
+        _ => unreachable!(),
     }
 }

src/ui/popup.rs

@@ -1,5 +1,5 @@
 use crate::ui::{centered_rect, surrounding_block};
-use crate::viewer::{App, PopupMode};
+use crate::viewer::{App, Mode, PopupMode};
 
 use tui::{
     backend::Backend,
@@ -10,22 +10,20 @@ use tui::{
 };
 use tui_tree_widget::Tree as TUITree;
 
-pub(super) fn draw_popup<B: Backend>(
-    f: &mut Frame<B>,
-    size: Rect,
-    pmode: &PopupMode,
-    app: &mut App,
-) {
-    let popup = centered_rect(70, 70, size);
+pub(super) fn draw_popup<B: Backend>(f: &mut Frame<B>, size: Rect, app: &mut App) {
+    let popup = centered_rect(90, 90, size);
 
-    match pmode {
-        PopupMode::Tree => draw_tree(f, popup, app),
-        PopupMode::Help => draw_help(f, popup, app),
+    match &app.mode {
+        Mode::Popup(pmode) => match pmode {
+            PopupMode::Tree => draw_tree(f, popup, app),
+            PopupMode::Help => draw_help(f, popup, app),
+        },
+        _ => unreachable!(),
     };
 }
 
 fn draw_tree<B: Backend>(f: &mut Frame<B>, chunk: Rect, app: &mut App) {
-    let block = surrounding_block("Filter by Subgraph".to_string(), false);
+    let block = surrounding_block("Select a subgraph".to_string(), false);
 
     let view = app.tabs.selected();
     let subtree = &mut view.subtree;
@@ -53,13 +51,17 @@ fn draw_help<B: Backend>(f: &mut Frame<B>, chunk: Rect, app: &mut App) {
         Row::new(row).height(1).bottom_margin(1)
     });
 
-    let table =
-        Table::new(rows).header(header).block(Block::default().borders(Borders::ALL)).widths(&[
+    let table = Table::new(rows)
+        .header(header)
+        .block(Block::default().borders(Borders::ALL))
+        .highlight_style(Style::default().add_modifier(Modifier::REVERSED))
+        .highlight_symbol("> ")
+        .widths(&[
             Constraint::Percentage(15),
             Constraint::Percentage(10),
-            Constraint::Percentage(10),
-            Constraint::Percentage(65),
+            Constraint::Percentage(15),
+            Constraint::Percentage(60),
         ]);
 
-    f.render_widget(table, chunk);
+    f.render_stateful_widget(table, chunk, &mut app.help.state);
 }