_{A real 9.8M-line logcat, indexed in ~2 s: field query tag:vold OR level:error, severity colors, timeline histogram.}

Logdor is a native Qt log viewer for files too big for a text editor. It memory-maps the file and indexes it quickly, auto-detects the format, and parses only the rows on screen. So a 1 GB log opens in about two seconds and filters without lag.

• 30+ formats built in logcat, syslog, Apache/nginx, JSON Lines, journalctl, Docker, Kubernetes CRI/klog, dmesg, auditd, CEF/LEEF, Snort, W3C/IIS, and more. Add your own by dropping a declarative JSON spec into ~/.local/share/logdor/formats no compiling, or author one interactively with the live-regex Custom Format Viewer.
• Field query language level:error tag:Wifi* pid>=100 "free text" with AND/OR/NOT (toggle the Q button), plus plain-text, regex, and time-range filtering with saved presets.
• Timeline a severity-colored histogram of the visible rows over time; click to jump, drag to restrict the filter to a time range.
• Annotations right-click a line to attach a note; notes live in a sidecar file (<log>.logdor.json) keyed by content, so they survive restarts, renames, and rotation and you can share the sidecar with a colleague or export an HTML/CSV report.
• Merged timeline interleave events from multiple files (even in different formats) into one time-sorted view.
• Live tail follow a growing file (F8); filters keep applying, and rotated or truncated files reload automatically.
• Folder workflows open a directory tree and hop between files with their view state intact, or grep the whole tree (gzipped logs included) and jump to any match. *.gz files open directly.
• Highlight rules color lines matching your patterns in every viewer.

Specialized viewer plugins handle CSV tables, Chrome NetLog captures, hex dumps, and even plotting coordinates found in log lines on a map see docs/ARCHITECTURE.md for the full list and how to write your own.

Two layers, kept strictly apart:

• core/ a GUI-free functional core (QtCore only, enforced at build time): mmap file access, line indexing, format parsers and auto-detection, the query engine, and off-thread filtering/sorting.
• app/ + plugins/ the Qt Widgets shell and viewer plugins, thin wrappers over one shared lazy table view that parses only visible rows.

Requires CMake >= 3.22, Qt >= 6.8, and a C++20 compiler.

cmake -B build        # or /path/to/Qt/6.x/gcc_64/bin/qt-cmake -B build
cmake --build build
build/app/logdor /path/to/file.log

Unit tests run with ctest --test-dir build -L unit --output-on-failure. Performance benchmarks are opt-in: configure with -DLOGDOR_ENABLE_BENCH=ON and run the bench label (gates: >1000 MB/s indexing, <4.5 bytes/line, <100 ms cancellation).

_{Logdor was a man! No... he was a logging man! Or... maybe he was just a log viewer. MIT.}