# show.py
#
# Copyright 2016 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Show changesets in detail with full log message, patches etc

For example, 'hg show --stat' prints something like:

  $ hg show --stat
  changeset:   1:b73358b94785
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       x
  description:
  longer


   x |  1 +
   1 files changed, 1 insertions(+), 0 deletions(-)

  diff -r 852a8d467a01 -r b73358b94785 x
  --- a/x	Thu Jan 01 00:00:00 1970 +0000
  +++ b/x	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,2 @@
   show
  +more
"""

from mercurial.i18n import _
from mercurial import cmdutil, commands, error, scmutil

cmdtable = {}
command = cmdutil.command(cmdtable)
testedwith = 'internal'

def uisetup(ui):
    permitted_opts = [
        ('g', 'git', None, _('use git extended diff format')),
        ('', 'stat', None, _('output diffstat-style summary of changes')),
    ] + commands.templateopts + commands.walkopts

    aliases, entry = cmdutil.findcmd('log', commands.table)
    allowed_opts = [opt for opt in entry[1] if opt in permitted_opts]

    # manual call of the decorator
    command('^show',
            allowed_opts,
            _('[OPTION]... [REV [FILE]...]'),
            inferrepo=True)(show)

def show(ui, repo, *args, **opts):
    """show revision in detail

    This behaves similarly to :hg:`log -vp -r REV [OPTION]... [FILE]...`, or
    if called without a REV, :hg:`log -vp -r . [OPTION]...` Use
    :hg:`log` for more powerful operations than supported by hg show

    See :hg:`help templates` for more about pre-packaged styles and
    specifying custom templates.

    """
    if len(args) == 0:
        opts['rev'] = ['.']
        pats = []
    else:
        opts['rev'] = [args[0]]
        pats = args[1:]
        if not scmutil.revrange(repo, opts['rev']):
            h = _("if %s is a file, try `hg show . %s`") % (args[0], args[0])
            raise error.Abort(_("unknown revision %s") % args[0],
                              hint=h)

    opts['patch'] = True
    opts['verbose'] = True

    verbosebackup = ui.backupconfig('ui', 'verbose')
    # Copy tracking is slow when doing a git diff. Override hgrc, and rely on
    # opts getting us a git diff if it's been requested. Ideally, we'd find and
    # fix the slowness in copy tracking, but this works for now.
    # On a commit with lots of possible copies, Bryan O'Sullivan found that this
    # reduces "time hg show" from 1.76 seconds to 0.81 seconds.
    gitdiffbackup = ui.backupconfig('diff', 'git')

    try:
        ui.setconfig('ui', 'verbose', True)
        ui.setconfig('diff', 'git', False)
        commands.log(ui, repo, *pats, **opts)

    finally:
        ui.restoreconfig(gitdiffbackup)
        ui.restoreconfig(verbosebackup)