rlogg - A fast text viewer inspired by klogg, glogg, and large-text-viewer

A two-pane GUI for filtering large text files by regex, built in Rust with egui.

┌──────────────────────────────────────────┐
│  TOP PANE — full file, all lines         │  ← CentralPanel (fills space)
│  selected line highlighted in amber      │
│  scrolls to center the selected line     │
├──────────────────────────────────────────┤
│  🔍 [regex input          ] [Filter] [✕] │  ← fixed search bar
│  42 matches found                        │
├──────────────────────────────────────────┤
│  BOTTOM PANE — matched lines only        │  ← BottomPanel (resizable)
│  click any row → top pane centers it     │
└──────────────────────────────────────────┘

Quick start

git clone <this repo>
cd rlogg
cargo run --release

Then: File → Open… → pick any text file → type a regex → press Enter or Filter.

Integrating large-text-core (for >4 GB files)

1. Uncomment the large-text-core dependency in Cargo.toml.
2. In src/app.rs, delete the stub FileReader struct and impl block.
3. Replace every use of FileReader with large_text_core::FileReader and large_text_core::LineIndexer.
4. Replace the start_search function body with large_text_core::SearchEngine::find_matches(reader, pattern, tx).

The channel protocol (SearchMessage::Match(line_no) / SearchMessage::Done) stays identical — only the implementation behind it changes.

Key concepts to study

Concept	Where
egui::TopBottomPanel layout order	app.rs update()
Virtual scrolling with show_rows	show_top_pane, show_bottom_pane
mpsc channels for background threads	poll_search_results, start_search
Centered scroll-to on click	top_pane_scroll_target + vertical_scroll_offset
Regex compilation + error handling	run_search