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# show.py - Extension implementing `hg show`
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#
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# Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""unified command to show various repository information (EXPERIMENTAL)
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This extension provides the :hg:`show` command, which provides a central
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command for displaying commonly-accessed repository data and views of that
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data.
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The following config options can influence operation.
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``commands``
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------------
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``show.aliasprefix``
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List of strings that will register aliases for views. e.g. ``s`` will
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effectively set config options ``alias.s<view> = show <view>`` for all
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views. i.e. `hg swork` would execute `hg show work`.
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Aliases that would conflict with existing registrations will not be
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performed.
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"""
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from __future__ import absolute_import
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from mercurial.i18n import _
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from mercurial.node import (
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hex,
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nullrev,
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)
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from mercurial import (
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cmdutil,
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commands,
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destutil,
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error,
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formatter,
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graphmod,
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phases,
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pycompat,
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registrar,
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revset,
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revsetlang,
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)
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# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'ships-with-hg-core'
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cmdtable = {}
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command = registrar.command(cmdtable)
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revsetpredicate = registrar.revsetpredicate()
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class showcmdfunc(registrar._funcregistrarbase):
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"""Register a function to be invoked for an `hg show <thing>`."""
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# Used by _formatdoc().
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_docformat = '%s -- %s'
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def _extrasetup(self, name, func, fmtopic=None, csettopic=None):
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"""Called with decorator arguments to register a show view.
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``name`` is the sub-command name.
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``func`` is the function being decorated.
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``fmtopic`` is the topic in the style that will be rendered for
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this view.
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``csettopic`` is the topic in the style to be used for a changeset
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printer.
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If ``fmtopic`` is specified, the view function will receive a
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formatter instance. If ``csettopic`` is specified, the view
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function will receive a changeset printer.
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"""
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func._fmtopic = fmtopic
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func._csettopic = csettopic
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showview = showcmdfunc()
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@command('show', [
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# TODO: Switch this template flag to use cmdutil.formatteropts if
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# 'hg show' becomes stable before --template/-T is stable. For now,
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# we are putting it here without the '(EXPERIMENTAL)' flag because it
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# is an important part of the 'hg show' user experience and the entire
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# 'hg show' experience is experimental.
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('T', 'template', '', ('display with template'), _('TEMPLATE')),
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], _('VIEW'))
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def show(ui, repo, view=None, template=None):
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"""show various repository information
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A requested view of repository data is displayed.
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If no view is requested, the list of available views is shown and the
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command aborts.
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.. note::
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There are no backwards compatibility guarantees for the output of this
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command. Output may change in any future Mercurial release.
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Consumers wanting stable command output should specify a template via
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``-T/--template``.
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List of available views:
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"""
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if ui.plain() and not template:
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hint = _('invoke with -T/--template to control output format')
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raise error.Abort(_('must specify a template in plain mode'), hint=hint)
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views = showview._table
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if not view:
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ui.pager('show')
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# TODO consider using formatter here so available views can be
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# rendered to custom format.
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ui.write(_('available views:\n'))
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ui.write('\n')
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for name, func in sorted(views.items()):
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ui.write(('%s\n') % func.__doc__)
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ui.write('\n')
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raise error.Abort(_('no view requested'),
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hint=_('use "hg show VIEW" to choose a view'))
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# TODO use same logic as dispatch to perform prefix matching.
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if view not in views:
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raise error.Abort(_('unknown view: %s') % view,
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hint=_('run "hg show" to see available views'))
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template = template or 'show'
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fn = views[view]
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ui.pager('show')
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if fn._fmtopic:
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fmtopic = 'show%s' % fn._fmtopic
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with ui.formatter(fmtopic, {'template': template}) as fm:
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return fn(ui, repo, fm)
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elif fn._csettopic:
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ref = 'show%s' % fn._csettopic
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spec = formatter.lookuptemplate(ui, ref, template)
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displayer = cmdutil.changeset_templater(ui, repo, spec, buffered=True)
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return fn(ui, repo, displayer)
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else:
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return fn(ui, repo)
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@showview('bookmarks', fmtopic='bookmarks')
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def showbookmarks(ui, repo, fm):
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"""bookmarks and their associated changeset"""
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marks = repo._bookmarks
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if not len(marks):
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# This is a bit hacky. Ideally, templates would have a way to
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# specify an empty output, but we shouldn't corrupt JSON while
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# waiting for this functionality.
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if not isinstance(fm, formatter.jsonformatter):
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ui.write(_('(no bookmarks set)\n'))
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return
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revs = [repo[node].rev() for node in marks.values()]
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active = repo._activebookmark
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longestname = max(len(b) for b in marks)
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nodelen = longestshortest(repo, revs)
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for bm, node in sorted(marks.items()):
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fm.startitem()
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fm.context(ctx=repo[node])
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fm.write('bookmark', '%s', bm)
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fm.write('node', fm.hexfunc(node), fm.hexfunc(node))
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fm.data(active=bm == active,
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longestbookmarklen=longestname,
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nodelen=nodelen)
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@showview('stack', csettopic='stack')
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def showstack(ui, repo, displayer):
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"""current line of work"""
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wdirctx = repo['.']
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if wdirctx.rev() == nullrev:
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raise error.Abort(_('stack view only available when there is a '
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'working directory'))
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if wdirctx.phase() == phases.public:
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ui.write(_('(empty stack; working directory parent is a published '
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'changeset)\n'))
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return
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# TODO extract "find stack" into a function to facilitate
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# customization and reuse.
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baserev = destutil.stackbase(ui, repo)
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basectx = None
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if baserev is None:
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baserev = wdirctx.rev()
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stackrevs = {wdirctx.rev()}
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else:
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stackrevs = set(repo.revs('%d::.', baserev))
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ctx = repo[baserev]
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if ctx.p1().rev() != nullrev:
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basectx = ctx.p1()
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# And relevant descendants.
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branchpointattip = False
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cl = repo.changelog
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for rev in cl.descendants([wdirctx.rev()]):
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ctx = repo[rev]
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# Will only happen if . is public.
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if ctx.phase() == phases.public:
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break
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stackrevs.add(ctx.rev())
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# ctx.children() within a function iterating on descandants
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# potentially has severe performance concerns because revlog.children()
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# iterates over all revisions after ctx's node. However, the number of
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# draft changesets should be a reasonably small number. So even if
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# this is quadratic, the perf impact should be minimal.
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if len(ctx.children()) > 1:
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branchpointattip = True
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break
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stackrevs = list(sorted(stackrevs, reverse=True))
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# Find likely target heads for the current stack. These are likely
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# merge or rebase targets.
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if basectx:
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# TODO make this customizable?
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newheads = set(repo.revs('heads(%d::) - %ld - not public()',
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basectx.rev(), stackrevs))
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else:
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newheads = set()
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allrevs = set(stackrevs) | newheads | set([baserev])
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nodelen = longestshortest(repo, allrevs)
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try:
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cmdutil.findcmd('rebase', commands.table)
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haverebase = True
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except (error.AmbiguousCommand, error.UnknownCommand):
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haverebase = False
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# TODO use templating.
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# TODO consider using graphmod. But it may not be necessary given
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# our simplicity and the customizations required.
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# TODO use proper graph symbols from graphmod
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tres = formatter.templateresources(ui, repo)
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shortesttmpl = formatter.maketemplater(ui, '{shortest(node, %d)}' % nodelen,
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resources=tres)
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def shortest(ctx):
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return shortesttmpl.render({'ctx': ctx, 'node': ctx.hex()})
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# We write out new heads to aid in DAG awareness and to help with decision
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# making on how the stack should be reconciled with commits made since the
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# branch point.
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if newheads:
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# Calculate distance from base so we can render the count and so we can
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# sort display order by commit distance.
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revdistance = {}
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for head in newheads:
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# There is some redundancy in DAG traversal here and therefore
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# room to optimize.
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ancestors = cl.ancestors([head], stoprev=basectx.rev())
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revdistance[head] = len(list(ancestors))
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sourcectx = repo[stackrevs[-1]]
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sortedheads = sorted(newheads, key=lambda x: revdistance[x],
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reverse=True)
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for i, rev in enumerate(sortedheads):
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ctx = repo[rev]
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if i:
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ui.write(': ')
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else:
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ui.write(' ')
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ui.write(('o '))
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displayer.show(ctx, nodelen=nodelen)
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displayer.flush(ctx)
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ui.write('\n')
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if i:
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ui.write(':/')
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else:
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ui.write(' /')
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ui.write(' (')
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ui.write(_('%d commits ahead') % revdistance[rev],
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label='stack.commitdistance')
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if haverebase:
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# TODO may be able to omit --source in some scenarios
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ui.write('; ')
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ui.write(('hg rebase --source %s --dest %s' % (
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shortest(sourcectx), shortest(ctx))),
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label='stack.rebasehint')
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ui.write(')\n')
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ui.write(':\n: ')
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ui.write(_('(stack head)\n'), label='stack.label')
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if branchpointattip:
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ui.write(' \\ / ')
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ui.write(_('(multiple children)\n'), label='stack.label')
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ui.write(' |\n')
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for rev in stackrevs:
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ctx = repo[rev]
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symbol = '@' if rev == wdirctx.rev() else 'o'
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if newheads:
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ui.write(': ')
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else:
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ui.write(' ')
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ui.write(symbol, ' ')
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displayer.show(ctx, nodelen=nodelen)
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displayer.flush(ctx)
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ui.write('\n')
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# TODO display histedit hint?
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if basectx:
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# Vertically and horizontally separate stack base from parent
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# to reinforce stack boundary.
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if newheads:
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ui.write(':/ ')
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else:
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ui.write(' / ')
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ui.write(_('(stack base)'), '\n', label='stack.label')
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ui.write(('o '))
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displayer.show(basectx, nodelen=nodelen)
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displayer.flush(basectx)
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ui.write('\n')
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@revsetpredicate('_underway([commitage[, headage]])')
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def underwayrevset(repo, subset, x):
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args = revset.getargsdict(x, 'underway', 'commitage headage')
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if 'commitage' not in args:
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args['commitage'] = None
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if 'headage' not in args:
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args['headage'] = None
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# We assume callers of this revset add a topographical sort on the
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# result. This means there is no benefit to making the revset lazy
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# since the topographical sort needs to consume all revs.
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#
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# With this in mind, we build up the set manually instead of constructing
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# a complex revset. This enables faster execution.
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# Mutable changesets (non-public) are the most important changesets
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# to return. ``not public()`` will also pull in obsolete changesets if
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# there is a non-obsolete changeset with obsolete ancestors. This is
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# why we exclude obsolete changesets from this query.
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rs = 'not public() and not obsolete()'
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rsargs = []
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if args['commitage']:
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rs += ' and date(%s)'
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rsargs.append(revsetlang.getstring(args['commitage'],
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_('commitage requires a string')))
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mutable = repo.revs(rs, *rsargs)
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relevant = revset.baseset(mutable)
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# Add parents of mutable changesets to provide context.
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relevant += repo.revs('parents(%ld)', mutable)
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# We also pull in (public) heads if they a) aren't closing a branch
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# b) are recent.
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rs = 'head() and not closed()'
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rsargs = []
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if args['headage']:
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rs += ' and date(%s)'
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rsargs.append(revsetlang.getstring(args['headage'],
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_('headage requires a string')))
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relevant += repo.revs(rs, *rsargs)
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# Add working directory parent.
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wdirrev = repo['.'].rev()
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if wdirrev != nullrev:
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relevant += revset.baseset({wdirrev})
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return subset & relevant
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@showview('work', csettopic='work')
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def showwork(ui, repo, displayer):
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"""changesets that aren't finished"""
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# TODO support date-based limiting when calling revset.
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revs = repo.revs('sort(_underway(), topo)')
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nodelen = longestshortest(repo, revs)
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revdag = graphmod.dagwalker(repo, revs)
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ui.setconfig('experimental', 'graphshorten', True)
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cmdutil.displaygraph(ui, repo, revdag, displayer, graphmod.asciiedges,
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props={'nodelen': nodelen})
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def extsetup(ui):
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# Alias `hg <prefix><view>` to `hg show <view>`.
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for prefix in ui.configlist('commands', 'show.aliasprefix'):
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for view in showview._table:
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name = '%s%s' % (prefix, view)
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choice, allcommands = cmdutil.findpossible(name, commands.table,
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strict=True)
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# This alias is already a command name. Don't set it.
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if name in choice:
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continue
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# Same for aliases.
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if ui.config('alias', name):
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continue
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ui.setconfig('alias', name, 'show %s' % view, source='show')
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def longestshortest(repo, revs, minlen=4):
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"""Return the length of the longest shortest node to identify revisions.
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The result of this function can be used with the ``shortest()`` template
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function to ensure that a value is unique and unambiguous for a given
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set of nodes.
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The number of revisions in the repo is taken into account to prevent
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a numeric node prefix from conflicting with an integer revision number.
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If we fail to do this, a value of e.g. ``10023`` could mean either
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revision 10023 or node ``10023abc...``.
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"""
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if not revs:
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return minlen
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# don't use filtered repo because it's slow. see templater.shortest().
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cl = repo.unfiltered().changelog
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return max(len(cl.shortest(hex(cl.node(r)), minlen)) for r in revs)
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# Adjust the docstring of the show command so it shows all registered views.
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# This is a bit hacky because it runs at the end of module load. When moved
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# into core or when another extension wants to provide a view, we'll need
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# to do this more robustly.
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# TODO make this more robust.
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def _updatedocstring():
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longest = max(map(len, showview._table.keys()))
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entries = []
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for key in sorted(showview._table.keys()):
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entries.append(pycompat.sysstr(' %s %s' % (
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key.ljust(longest), showview._table[key]._origdoc)))
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cmdtable['show'][0].__doc__ = pycompat.sysstr('%s\n\n%s\n ') % (
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cmdtable['show'][0].__doc__.rstrip(),
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pycompat.sysstr('\n\n').join(entries))
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_updatedocstring()
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