The builtin logo, or a text file in logo syntax, drawn as an extruded slab:
the front is the art as it is, the back is the art mirrored, and the side
walls are shaded with block glyphs. Rendering is pure: no terminal, no
input, no timer.
`--logo-type spin` hands every frame to the normal logo pipeline, so the
modules are laid out beside it exactly as they are for any other type, and
the first frame without --watch is byte-identical to the same art printed
as a builtin logo.
The rotation is driven by the `--watch` loop: `ffSpinTick()` runs once per
refresh and `ffLogoPrint()` is called only when it reports a step, so the
logo and the modules can never drift apart, and a build that never uses the
type costs one comparison per refresh.
Speed is set either as degrees per frame (--logo-spin-speed-per-frame,
default 10) or as seconds per revolution (--logo-spin-speed-per-round,
read from the clock and winning over the former when both are given). Both
take negative values to turn the other way, and --logo-spin-angle picks the
frame to start from.
- Windows: use FILE_FS_FULL_SIZE_INFORMATION_EX on Windows 10 1809+ (Build >= 17763) when calcType != AVAILABLE to get ActualTotalAllocationUnits/ActualAvailableAllocationUnits (ignoring per-user disk quotas). Fall back to legacy FILE_FS_FULL_SIZE_INFORMATION with CallerAvailableAllocationUnits when calcType is AVAILABLE or EX is unavailable.
- Unix-like: respect --disk-calc-type. Use f_bfree for FREE, f_bavail for AVAILABLE (Linux/BSD/SunOS). Haiku currently always uses free_blocks.
- Refactor FFDisk: remove bytesUsed and bytesAvailable; compute used = total - free in disk module.
- Disk module: update custom format (remove `size-available`, add `bytes-used` and `bytes-total`); update JSON output (remove `bytes.available`, `bytes.used`).
- Disk detection: stop computing used in common path; let each platform set bytesFree by chosen semantics.
Fixes#2651
Carter Li