hgext/show.py

strip: include phases in bundle (BC)

Before this patch, unbundling a stripped changeset would make it a
draft (unless the parent was secret). This meant that one would lose
phase information when stripping and unbundling secret changesets. The
same thing was true for public changesets. While stripping public
changesets is generally rare, it's done frequently by e.g. the
narrowhg extension.

We also include the phases in the temporary bundle, just in case
stripping were to fail after that point, so the user can still restore
the repo including phase information. Before this patch, the phases
were left untouched during the bundling and unbundling of the
temporary bundle. Only at the end of the transaction would
phasecache.filterunknown() be called to remove phase roots that were
no longer valid. We now need to call that also after the first
stripping, i.e. before applying the temporary bundle. Otherwise
unbundling the temporary bundle will cause a read of the phase cache
which has stripped changesets in the cache and that fails.

Like with obsmarkers, we unconditionally include the phases in the
bundle when stripping (when using bundle2, such as when generaldelta
is enabled). The reason for doing that for strip but not for bundle is
that strip bundles are not meant to be shared outside the repo, so we
don't care as much about compatibility.

# show.py - Extension implementing `hg show`
#
# Copyright 2017 Gregory Szorc <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

"""unified command to show various repository information (EXPERIMENTAL)

This extension provides the :hg:`show` command, which provides a central
command for displaying commonly-accessed repository data and views of that
data.
"""

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial.node import nullrev
from mercurial import (
    cmdutil,
    error,
    formatter,
    graphmod,
    pycompat,
    registrar,
    revset,
    revsetlang,
)

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'

cmdtable = {}
command = registrar.command(cmdtable)
revsetpredicate = registrar.revsetpredicate()

class showcmdfunc(registrar._funcregistrarbase):
    """Register a function to be invoked for an `hg show <thing>`."""

    # Used by _formatdoc().
    _docformat = '%s -- %s'

    def _extrasetup(self, name, func, fmtopic=None):
        """Called with decorator arguments to register a show view.

        ``name`` is the sub-command name.

        ``func`` is the function being decorated.

        ``fmtopic`` is the topic in the style that will be rendered for
        this view.
        """
        func._fmtopic = fmtopic

showview = showcmdfunc()

@command('show', [
    # TODO: Switch this template flag to use cmdutil.formatteropts if
    # 'hg show' becomes stable before --template/-T is stable. For now,
    # we are putting it here without the '(EXPERIMENTAL)' flag because it
    # is an important part of the 'hg show' user experience and the entire
    # 'hg show' experience is experimental.
    ('T', 'template', '', ('display with template'), _('TEMPLATE')),
    ], _('VIEW'))
def show(ui, repo, view=None, template=None):
    """show various repository information

    A requested view of repository data is displayed.

    If no view is requested, the list of available views is shown and the
    command aborts.

    .. note::

       There are no backwards compatibility guarantees for the output of this
       command. Output may change in any future Mercurial release.

       Consumers wanting stable command output should specify a template via
       ``-T/--template``.

    List of available views:
    """
    if ui.plain() and not template:
        hint = _('invoke with -T/--template to control output format')
        raise error.Abort(_('must specify a template in plain mode'), hint=hint)

    views = showview._table

    if not view:
        ui.pager('show')
        # TODO consider using formatter here so available views can be
        # rendered to custom format.
        ui.write(_('available views:\n'))
        ui.write('\n')

        for name, func in sorted(views.items()):
            ui.write(('%s\n') % func.__doc__)

        ui.write('\n')
        raise error.Abort(_('no view requested'),
                          hint=_('use "hg show VIEW" to choose a view'))

    # TODO use same logic as dispatch to perform prefix matching.
    if view not in views:
        raise error.Abort(_('unknown view: %s') % view,
                          hint=_('run "hg show" to see available views'))

    template = template or 'show'
    fmtopic = 'show%s' % views[view]._fmtopic

    ui.pager('show')
    with ui.formatter(fmtopic, {'template': template}) as fm:
        return views[view](ui, repo, fm)

@showview('bookmarks', fmtopic='bookmarks')
def showbookmarks(ui, repo, fm):
    """bookmarks and their associated changeset"""
    marks = repo._bookmarks
    if not len(marks):
        # This is a bit hacky. Ideally, templates would have a way to
        # specify an empty output, but we shouldn't corrupt JSON while
        # waiting for this functionality.
        if not isinstance(fm, formatter.jsonformatter):
            ui.write(_('(no bookmarks set)\n'))
        return

    active = repo._activebookmark
    longestname = max(len(b) for b in marks)
    # TODO consider exposing longest shortest(node).

    for bm, node in sorted(marks.items()):
        fm.startitem()
        fm.context(ctx=repo[node])
        fm.write('bookmark', '%s', bm)
        fm.write('node', fm.hexfunc(node), fm.hexfunc(node))
        fm.data(active=bm == active,
                longestbookmarklen=longestname)

@revsetpredicate('_underway([commitage[, headage]])')
def underwayrevset(repo, subset, x):
    args = revset.getargsdict(x, 'underway', 'commitage headage')
    if 'commitage' not in args:
        args['commitage'] = None
    if 'headage' not in args:
        args['headage'] = None

    # We assume callers of this revset add a topographical sort on the
    # result. This means there is no benefit to making the revset lazy
    # since the topographical sort needs to consume all revs.
    #
    # With this in mind, we build up the set manually instead of constructing
    # a complex revset. This enables faster execution.

    # Mutable changesets (non-public) are the most important changesets
    # to return. ``not public()`` will also pull in obsolete changesets if
    # there is a non-obsolete changeset with obsolete ancestors. This is
    # why we exclude obsolete changesets from this query.
    rs = 'not public() and not obsolete()'
    rsargs = []
    if args['commitage']:
        rs += ' and date(%s)'
        rsargs.append(revsetlang.getstring(args['commitage'],
                                           _('commitage requires a string')))

    mutable = repo.revs(rs, *rsargs)
    relevant = revset.baseset(mutable)

    # Add parents of mutable changesets to provide context.
    relevant += repo.revs('parents(%ld)', mutable)

    # We also pull in (public) heads if they a) aren't closing a branch
    # b) are recent.
    rs = 'head() and not closed()'
    rsargs = []
    if args['headage']:
        rs += ' and date(%s)'
        rsargs.append(revsetlang.getstring(args['headage'],
                                           _('headage requires a string')))

    relevant += repo.revs(rs, *rsargs)

    # Add working directory parent.
    wdirrev = repo['.'].rev()
    if wdirrev != nullrev:
        relevant += revset.baseset({wdirrev})

    return subset & relevant

@showview('work', fmtopic='work')
def showwork(ui, repo, fm):
    """changesets that aren't finished"""
    # TODO support date-based limiting when calling revset.
    revs = repo.revs('sort(_underway(), topo)')

    revdag = graphmod.dagwalker(repo, revs)
    tmpl = fm._t.load(fm._topic)
    displayer = cmdutil.makelogtemplater(ui, repo, tmpl, buffered=True)

    ui.setconfig('experimental', 'graphshorten', True)
    cmdutil.displaygraph(ui, repo, revdag, displayer, graphmod.asciiedges)

# Adjust the docstring of the show command so it shows all registered views.
# This is a bit hacky because it runs at the end of module load. When moved
# into core or when another extension wants to provide a view, we'll need
# to do this more robustly.
# TODO make this more robust.
def _updatedocstring():
    longest = max(map(len, showview._table.keys()))
    entries = []
    for key in sorted(showview._table.keys()):
        entries.append(pycompat.sysstr('    %s   %s' % (
            key.ljust(longest), showview._table[key]._origdoc)))

    cmdtable['show'][0].__doc__ = pycompat.sysstr('%s\n\n%s\n    ') % (
        cmdtable['show'][0].__doc__.rstrip(),
        pycompat.sysstr('\n\n').join(entries))

_updatedocstring()