hgext/progress.py

record: refactor the prompt loop

The previous loop was iterating over a mixed header/hunk stream. It may have
been more generic in the sense every item in the stream could trigger a prompt
but it required more work to skip items properly. It can be rewritten in a more
intuitive way by looping on files then looping on hunks.

# progress.py show progress bars for some actions
#
# Copyright (C) 2010 Augie Fackler <[e-mail]>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

"""show progress bars for some actions

This extension uses the progress information logged by hg commands
to draw progress bars that are as informative as possible. Some progress
bars only offer indeterminate information, while others have a definite
end point.

The following settings are available::

  [progress]
  delay = 3 # number of seconds (float) before showing the progress bar
  refresh = 0.1 # time in seconds between refreshes of the progress bar
  format = topic bar number estimate # format of the progress bar
  width = <none> # if set, the maximum width of the progress information
                 # (that is, min(width, term width) will be used)
  clear-complete = True # clear the progress bar after it's done
  disable = False # if true, don't show a progress bar
  assume-tty = False # if true, ALWAYS show a progress bar, unless
                     # disable is given

Valid entries for the format field are topic, bar, number, unit,
estimate, and item. item defaults to the last 20 characters of the
item, but this can be changed by adding either ``-<num>`` which would
take the last num characters, or ``+<num>`` for the first num
characters.
"""

import sys
import time

from mercurial.i18n import _
from mercurial import util

def spacejoin(*args):
    return ' '.join(s for s in args if s)

def shouldprint(ui):
    return (getattr(sys.stderr, 'isatty', None) and
            (sys.stderr.isatty() or ui.configbool('progress', 'assume-tty')))

def fmtremaining(seconds):
    if seconds < 60:
        # i18n: format XX seconds as "XXs"
        return _("%02ds") % (seconds)
    minutes = seconds // 60
    if minutes < 60:
        seconds -= minutes * 60
        # i18n: format X minutes and YY seconds as "XmYYs"
        return _("%dm%02ds") % (minutes, seconds)
    # we're going to ignore seconds in this case
    minutes += 1
    hours = minutes // 60
    minutes -= hours * 60
    if hours < 30:
        # i18n: format X hours and YY minutes as "XhYYm"
        return _("%dh%02dm") % (hours, minutes)
    # we're going to ignore minutes in this case
    hours += 1
    days = hours // 24
    hours -= days * 24
    if days < 15:
        # i18n: format X days and YY hours as "XdYYh"
        return _("%dd%02dh") % (days, hours)
    # we're going to ignore hours in this case
    days += 1
    weeks = days // 7
    days -= weeks * 7
    if weeks < 55:
        # i18n: format X weeks and YY days as "XwYYd"
        return _("%dw%02dd") % (weeks, days)
    # we're going to ignore days and treat a year as 52 weeks
    weeks += 1
    years = weeks // 52
    weeks -= years * 52
    # i18n: format X years and YY weeks as "XyYYw"
    return _("%dy%02dw") % (years, weeks)

class progbar(object):
    def __init__(self, ui):
        self.ui = ui
        self.resetstate()

    def resetstate(self):
        self.topics = []
        self.topicstates = {}
        self.starttimes = {}
        self.startvals = {}
        self.printed = False
        self.lastprint = time.time() + float(self.ui.config(
            'progress', 'delay', default=3))
        self.indetcount = 0
        self.refresh = float(self.ui.config(
            'progress', 'refresh', default=0.1))
        self.order = self.ui.configlist(
            'progress', 'format',
            default=['topic', 'bar', 'number', 'estimate'])

    def show(self, now, topic, pos, item, unit, total):
        if not shouldprint(self.ui):
            return
        termwidth = self.width()
        self.printed = True
        head = ''
        needprogress = False
        tail = ''
        for indicator in self.order:
            add = ''
            if indicator == 'topic':
                add = topic
            elif indicator == 'number':
                if total:
                    add = ('% ' + str(len(str(total))) +
                           's/%s') % (pos, total)
                else:
                    add = str(pos)
            elif indicator.startswith('item') and item:
                slice = 'end'
                if '-' in indicator:
                    wid = int(indicator.split('-')[1])
                elif '+' in indicator:
                    slice = 'beginning'
                    wid = int(indicator.split('+')[1])
                else:
                    wid = 20
                if slice == 'end':
                    add = item[-wid:]
                else:
                    add = item[:wid]
                add += (wid - len(add)) * ' '
            elif indicator == 'bar':
                add = ''
                needprogress = True
            elif indicator == 'unit' and unit:
                add = unit
            elif indicator == 'estimate':
                add = self.estimate(topic, pos, total, now)
            if not needprogress:
                head = spacejoin(head, add)
            else:
                tail = spacejoin(tail, add)
        if needprogress:
            used = 0
            if head:
                used += len(head) + 1
            if tail:
                used += len(tail) + 1
            progwidth = termwidth - used - 3
            if total and pos <= total:
                amt = pos * progwidth // total
                bar = '=' * (amt - 1)
                if amt > 0:
                    bar += '>'
                bar += ' ' * (progwidth - amt)
            else:
                progwidth -= 3
                self.indetcount += 1
                # mod the count by twice the width so we can make the
                # cursor bounce between the right and left sides
                amt = self.indetcount % (2 * progwidth)
                amt -= progwidth
                bar = (' ' * int(progwidth - abs(amt)) + '<=>' +
                       ' ' * int(abs(amt)))
            prog = ''.join(('[', bar , ']'))
            out = spacejoin(head, prog, tail)
        else:
            out = spacejoin(head, tail)
        sys.stderr.write('\r' + out[:termwidth])
        sys.stderr.flush()

    def clear(self):
        if not shouldprint(self.ui):
            return
        sys.stderr.write('\r%s\r' % (' ' * self.width()))

    def complete(self):
        if not shouldprint(self.ui):
            return
        if self.ui.configbool('progress', 'clear-complete', default=True):
            self.clear()
        else:
            sys.stderr.write('\n')
        sys.stderr.flush()

    def width(self):
        tw = self.ui.termwidth()
        return min(int(self.ui.config('progress', 'width', default=tw)), tw)

    def estimate(self, topic, pos, total, now):
        if total is None:
            return ''
        initialpos = self.startvals[topic]
        target = total - initialpos
        delta = pos - initialpos
        if delta > 0:
            elapsed = now - self.starttimes[topic]
            if elapsed > float(
                self.ui.config('progress', 'estimate', default=2)):
                seconds = (elapsed * (target - delta)) // delta + 1
                return fmtremaining(seconds)
        return ''

    def progress(self, topic, pos, item='', unit='', total=None):
        now = time.time()
        if pos is None:
            self.starttimes.pop(topic, None)
            self.startvals.pop(topic, None)
            self.topicstates.pop(topic, None)
            # reset the progress bar if this is the outermost topic
            if self.topics and self.topics[0] == topic and self.printed:
                self.complete()
                self.resetstate()
            # truncate the list of topics assuming all topics within
            # this one are also closed
            if topic in self.topics:
              self.topics = self.topics[:self.topics.index(topic)]
        else:
            if topic not in self.topics:
                self.starttimes[topic] = now
                self.startvals[topic] = pos
                self.topics.append(topic)
            self.topicstates[topic] = pos, item, unit, total
            if now - self.lastprint >= self.refresh and self.topics:
                self.lastprint = now
                current = self.topics[-1]
                self.show(now, topic, *self.topicstates[topic])

def uisetup(ui):
    class progressui(ui.__class__):
        _progbar = None

        def progress(self, *args, **opts):
            self._progbar.progress(*args, **opts)
            return super(progressui, self).progress(*args, **opts)

        def write(self, *args, **opts):
            if self._progbar.printed:
                self._progbar.clear()
            return super(progressui, self).write(*args, **opts)

        def write_err(self, *args, **opts):
            if self._progbar.printed:
                self._progbar.clear()
            return super(progressui, self).write_err(*args, **opts)

    # Apps that derive a class from ui.ui() can use
    # setconfig('progress', 'disable', 'True') to disable this extension
    if ui.configbool('progress', 'disable'):
        return
    if shouldprint(ui) and not ui.debugflag and not ui.quiet:
        ui.__class__ = progressui
        # we instantiate one globally shared progress bar to avoid
        # competing progress bars when multiple UI objects get created
        if not progressui._progbar:
            progressui._progbar = progbar(ui)

def reposetup(ui, repo):
    uisetup(repo.ui)