Show progress bar on long running tasks

[JacksonChen666]

currently, reclaiming space on a disk image only shows a spinner.

there's no indication of progress happening, which doesn't assure the user progress is being made (or how much is done).

[osy]

This is unlikely to be fixed because QEMU does not provide progress.

[JacksonChen666]

I'm pretty sure there's verbose mode that tells that, but idk if that does exist

[JacksonChen666]

just checked to say there's `-p` to "display progress bar" (is it actually a bar? also only convert and rebase) and not "verbose mode"

[osy]

Hmm, if they have a progress bar it should be possible to capture it and convert it into a number.

[JacksonChen666]

well, it's actually just a number, not a progress bar.
i think parsing implementation would be easy, but i'm not sure about the UI part.

(also, each new line shows up as ^M on neovim on macOS, just making note of that)

example output

    (0.00/100%)
    (1.01/100%)
    (2.03/100%)
    (3.05/100%)
    (4.05/100%)
    (5.07/100%)
    (6.08/100%)
    (7.09/100%)
    (8.09/100%)
    (9.09/100%)
    (10.10/100%)
    (11.12/100%)
    (12.12/100%)
    (13.13/100%)
    (14.14/100%)
    (15.16/100%)
    (16.17/100%)
    (17.19/100%)
    (18.21/100%)
    (19.22/100%)
    (20.24/100%)
    (21.25/100%)
    (22.26/100%)
    (23.28/100%)
    (24.28/100%)
    (25.29/100%)
    (26.32/100%)
    (27.32/100%)
    (28.33/100%)
    (29.34/100%)
    (30.35/100%)
    (31.36/100%)
    (32.38/100%)
    (33.39/100%)
    (34.41/100%)
    (35.42/100%)
    (36.43/100%)
    (37.45/100%)
    (38.45/100%)
    (39.46/100%)
    (40.47/100%)
    (41.48/100%)
    (42.48/100%)
    (43.50/100%)
    (44.52/100%)
    (45.53/100%)
    (46.56/100%)
    (47.58/100%)
    (48.58/100%)
    (49.60/100%)
    (50.61/100%)
    (51.62/100%)
    (52.62/100%)
    (53.63/100%)
    (54.65/100%)
    (55.66/100%)
    (56.67/100%)
    (57.67/100%)
    (58.67/100%)
    (59.68/100%)
    (60.69/100%)
    (61.70/100%)
    (62.71/100%)
    (63.72/100%)
    (64.73/100%)
    (65.73/100%)
    (66.74/100%)
    (67.75/100%)
    (68.75/100%)
    (69.75/100%)
    (70.78/100%)
    (71.80/100%)
    (72.81/100%)
    (73.81/100%)
    (74.82/100%)
    (75.83/100%)
    (76.84/100%)
    (77.84/100%)
    (78.85/100%)
    (79.88/100%)
    (80.88/100%)
    (81.90/100%)
    (82.91/100%)
    (83.92/100%)
    (84.93/100%)
    (85.93/100%)
    (86.95/100%)
    (87.97/100%)
    (89.00/100%)
    (90.01/100%)
    (91.01/100%)
    (92.02/100%)
    (93.03/100%)
    (94.03/100%)
    (95.04/100%)
    (96.06/100%)
    (97.07/100%)
    (98.08/100%)
    (99.08/100%)
    (100.00/100%)
    (100.00/100%)