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bitbake: lib: implement basic task progress support

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For long-running tasks where we have some output from the task that
gives us some idea of the progress of the task (such as a percentage
complete), provide the means to scrape the output for that progress
information and show it to the user in the default knotty terminal
output in the form of a progress bar. This is implemented using a new
TaskProgress event as well as some code we can insert to do output
scanning/filtering.

Any task can fire TaskProgress events; however, if you have a shell task
whose output you wish to scan for progress information, you just need to
set the "progress" varflag on the task. This can be set to:
 * "percent" to just look for a number followed by a % sign
 * "percent:<regex>" to specify your own regex matching a percentage
   value (must have a single group which matches the percentage number)
 * "outof:<regex>" to look for the specified regex matching x out of y
   items completed (must have two groups - first group needs to be x,
   second y).
We can potentially extend this in future but this should be a good
start.

Part of the implementation for [YOCTO #5383].

(Bitbake rev: 0d275fc5b6531957a6189069b04074065bb718a0)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Paul Eggleton
2016-06-23 22:59:05 +12:00
committed by Richard Purdie
parent 1cf6e14a6c
commit ac5e720575
6 changed files with 239 additions and 14 deletions
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bitbake/lib/progressbar/widgets.py
+36
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@@ -353,3 +353,39 @@ class BouncingBar(Bar):
if not self.fill_left: rpad, lpad = lpad, rpad
return '%s%s%s%s%s' % (left, lpad, marker, rpad, right)
class BouncingSlider(Bar):
"""
A slider that bounces back and forth in response to update() calls
without reference to the actual value. Based on a combination of
BouncingBar from a newer version of this module and RotatingMarker.
"""
def __init__(self, marker='<=>'):
self.curmark = -1
self.forward = True
Bar.__init__(self, marker=marker)
def update(self, pbar, width):
left, marker, right = (format_updatable(i, pbar) for i in
(self.left, self.marker, self.right))
width -= len(left) + len(right)
if width < 0:
return ''
if pbar.finished: return '%s%s%s' % (left, width * '=', right)
self.curmark = self.curmark + 1
position = int(self.curmark % (width * 2 - 1))
if position + len(marker) > width:
self.forward = not self.forward
self.curmark = 1
position = 1
lpad = ' ' * (position - 1)
rpad = ' ' * (width - len(marker) - len(lpad))
if not self.forward:
temp = lpad
lpad = rpad
rpad = temp
return '%s%s%s%s%s' % (left, lpad, marker, rpad, right)