Add an option to build non-recursive reports for large directories

[BertrandAlexandre]

As specified in the README, scanning directories with many files can take a long time and leads to a large report.
However, scanning a large directory or a full disk can be very interesting.
Maybe an option to build non-recursive reports could be interesting.
This would be a report with top-level files and folders only.

[GaelGirodon]

Why not but you'd only get a lighter report, not a faster scan. Even to get the size of top-level files and folders only, you need to walk through the whole file hierarchy as the size of a folder is computed by summing the size of all of its children, recursively. Would it be really relevant to add an option that still leads to a full scan but outputs a partial report?

[BertrandAlexandre]

Objective is indeed to reduce the size of both report files. Analyzes can run as background tasks so I think it's not a problem.
For large amount of files, html report may take several minutes to open.

[GaelGirodon]

I get the point, but that means you'll run a full scan and just throw away 99% of collected data in the output report just to make it lighter 😕 And if top-level results are finally not enough to decide what to cleanup, you'll have to re-run the full scan with a different depth parameter.
From your experience using dirstat, could you tell me from which report size / number of files the HTML report becomes too big to be opened in a reasonable amount of time? A 12 MB report (~35k files) only takes a couple of seconds to open, but I never tried to scan folders big enough to produce a report that couldn't be opened in less than 20-30 seconds.