v2.12.0 — MHD Tuning support, '#' metadata header fix

Highlights

First stable release since v2.10.1. It carries the MHD Tuning support below plus everything that was staged for 2.11.0 but never shipped stable — a deep correctness and performance sweep, settings persistence, and a rewritten expression engine.

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New: MHD Tuning log support

UltraLog now reads CSV datalogs exported from the MHD Tuning app — BMW N54, N55, S55, B58 and other platforms flashed with MHD.

• Units are read straight from the column headers, with MHD's degree notation translated: (*C) → °C, (*) → °, (*CRK) → °CRK, and (-) for unitless channels
• Time is read as seconds and normalized to start at zero
• The tune file name (e.g. MHD 5.26 IJE0S ST2V7.bin) is kept as log metadata instead of cluttering the channel list
• Unparseable fields carry the last known value forward, so columns never shift out of alignment

Fixed: logs with # metadata headers loaded with no channels

This is the bug behind #78. MHD exports — and OBD-II app exports such as OBDLink — start with a block of #-prefixed metadata lines before the real CSV header:

#Encoding: UTF-8
#Ecu PRGID: 7616431
#VIN: ...
Time,Boost (Bar),Coolant (*C),RPM (RPM),...

Every format detector inspects the first line of a file. That line was a comment, so nothing matched, detection fell through to the default parser, and the log opened with zero channels — the app appeared to do nothing at all.

Text logs are now normalized before format detection: a leading UTF-8 BOM is stripped, and a leading block of # comment lines is dropped so the real header row is what detection sees. This fixes MHD and the OBDLink class of failure together, and any future exporter that writes a comment preamble.

Thanks to @Turbo-Tuning for the report and the sample log, and to @andris-silis for spotting the same failure with OBDLink and narrowing it to the # lines.

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Also in this release (staged for 2.11.0)

Crash and data-correctness fixes

• Speeduino: truncated MLG v2 headers caused an index-out-of-bounds panic
• App: a parser panic on the loader thread left the UI stuck on the loading spinner forever — errors now surface as a toast
• Haltech: unparseable fields (blank, N/A, text gears) shifted every later column left, misaligning the whole row
• Haltech: sessions crossing midnight produced non-monotonic timestamps, breaking time-shifted computed channels like RPM@-0.1s
• Normalization: a channel named Speed normalized to RPM or Vehicle Speed nondeterministically between launches
• App: opening a file while another was loading silently dropped the first result; multi-file drag-and-drop loaded only the first file
• App: analysis results were not reindexed when a file was removed, attaching cached analyses to the wrong file
• Adapters: spec cache filenames are sanitized against path traversal

Performance

• The MCP/IPC server no longer forces a 10 Hz repaint forever — the GUI wakes on demand, ending idle battery drain
• Chart downsampling is cached per channel and recomputed only when the viewport changes, instead of every channel every frame
• Scatter heatmaps are built once per axis selection rather than rebuilt per frame

Features

• Settings persistence — unit preferences, font scale, colorblind mode, field normalization, cursor tracking, auto-update preference, and custom channel mappings now survive restarts
• Esc stops playback and Cmd/Ctrl+E exports the current view as PNG

Under the hood

• The meval formula dependency was replaced with a built-in expression engine. meval was unmaintained and its transitive nom 1.2.4 dependency is rejected by future Rust versions. Formula behavior is unchanged; formulas now compile once and evaluate with no parsing or allocation per record.

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Full Changelog: v2.10.1...v2.12.0

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Installation

macOS

1. Download the appropriate .dmg file for your Mac:
   • Intel Mac: ultralog-macos-intel.dmg
   • Apple Silicon (M1/M2/M3/M4): ultralog-macos-arm64.dmg
2. Open the DMG and drag UltraLog to your Applications folder
3. Launch UltraLog from Applications. The app is signed and notarized by Apple, so it opens without a Gatekeeper warning.

Windows

1. Download ultralog-windows.zip
2. Extract the zip file
3. Run ultralog-windows.exe

Linux

1. Download ultralog-linux.tar.gz
2. Extract: tar -xzf ultralog-linux.tar.gz
3. Run: ./ultralog-linux