LogUI build 25 can select and copy log entries, and more

Last week I introduced my new prototype log browser, LogUI, which seems to have been popular with many. As I now use it in preference to its predecessor Ulbow, I’ve spent a little time adding some new and improved features to bring you version 1.0 build 25. Changes include:

support for discontinuous selection of log entries,
support for copying text from selected log entries,
subsystem names are now case-insensitive,
support for Signposts,
window names change to include the start time of each log excerpt,
RTF saved file names change to reflect the start of each log excerpt.

Settings

These now let you set app defaults for displaying full log entries, and for fetching and displaying Signposts.

Browser controls

The only addition to these is the option to Show Signposts. When that’s ticked, Get Log also fetches all Signposts during the set period, and displays them inline with regular log entries.

LogUI now supports all types of log entry:

regular log entries,
Activities, events such as clicks/taps and others,
Boundaries, markers such as the start of the boot process,
Signposts, used to record significant steps and assess performance.

Signposts have their own custom fields, including signpost ID, name, and type, which are displayed when Full Fields are enabled. The only caution with Signposts is that they can outnumber regular log entries, so if you don’t need to see them, it’s better to leave them turned off.

I’m grateful to Joe for asking for the subsystem to be case-insensitive. This means that you can enter com.apple.TimeMachine or com.apple.timemachine as the subsystem and LogUI will display entries with a subsystem name of com.apple.TimeMachine for both. No longer will case trip you up.

Log entries

The biggest changes are in the selection and copying of log entries. You can now select log entries in a browser window. Selections can be multiple continuous using the Shift key modifier, and discontinuous using the Command key modifier. When one or more entries have been selected, you can then copy their text contents using the Copy command or Command-C. Copied text can then be pasted into an app that supports handling of text items in the Clipboard.

Because there are many different fields possible in each entry, copied text consists of a standard set:
date level sender process subsystem message
each separated by a Tab character.

If you want more fields with colour, save the log excerpt in RTF, open it in an RTF editor and copy from that.

If you’re a developer and are wondering how I have implemented this copy feature for a SwiftUI List, let me know and I’ll explain how I managed to pin this tail on the donkey while I was blindfolded, or how persistent guessing overcame the absence of documentation or example code.

Naming

To distinguish between windows and saved RTF files, LogUI now automatically names and renames its windows and the default file names suggested when saving files. Names are based on the Start date and time of the current log excerpt in that window. To begin with, when there’s no log extract, each new window is named LogUI. When it gains its first extract, the date and time are appended to that, e.g. LogUI 2025_03_03_08-14-00, and a similar default file name is offered. When you obtain a new log excerpt in the same window, those names are updated to reflect the changed Start date and time.

Help book

This has been updated to include all these changes.

LogUI 1.0 build 25 is now available from here: logui125
It still requires a minimum macOS version of 14.6, I’m afraid, because of the SwiftUI features it has to rely on.

Enjoy!