# churn.py - create a graph of revisions count grouped by template

#

# Copyright 2006 Josef "Jeff" Sipek <jeffpc@josefsipek.net>

# Copyright 2008 Alexander Solovyov <piranha@piranha.org.ua>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''command to display statistics about repository history'''

from mercurial.i18n import _

from mercurial import patch, cmdutil, util, templater, commands

import os

import time, datetime

def maketemplater(ui, repo, tmpl):

    tmpl = templater.parsestring(tmpl, quoted=False)

    try:

        t = cmdutil.changeset_templater(ui, repo, False, None, None, False)

    except SyntaxError, inst:

        raise util.Abort(inst.args[0])

    t.use_template(tmpl)

    return t

def changedlines(ui, repo, ctx1, ctx2, fns):

    added, removed = 0, 0

    fmatch = cmdutil.matchfiles(repo, fns)

    diff = ''.join(patch.diff(repo, ctx1.node(), ctx2.node(), fmatch))

    for l in diff.split('\n'):

        if l.startswith("+") and not l.startswith("+++ "):

            added += 1

        elif l.startswith("-") and not l.startswith("--- "):

            removed += 1

    return (added, removed)

def countrate(ui, repo, amap, *pats, **opts):

    """Calculate stats"""

    if opts.get('dateformat'):

        def getkey(ctx):

            t, tz = ctx.date()

            date = datetime.datetime(*time.gmtime(float(t) - tz)[:6])

            return date.strftime(opts['dateformat'])

    else:

        tmpl = opts.get('template', '{author|email}')

        tmpl = maketemplater(ui, repo, tmpl)

        def getkey(ctx):

            ui.pushbuffer()

            tmpl.show(ctx)

            return ui.popbuffer()

    state = {'count': 0}

    rate = {}

    df = False

    if opts.get('date'):

        df = util.matchdate(opts['date'])

    m = cmdutil.match(repo, pats, opts)

    def prep(ctx, fns):

        rev = ctx.rev()

        if df and not df(ctx.date()[0]): # doesn't match date format

            return

        key = getkey(ctx)

        key = amap.get(key, key) # alias remap

        if opts.get('changesets'):

            rate[key] = (rate.get(key, (0,))[0] + 1, 0)

        else:

            parents = ctx.parents()

            if len(parents) > 1:

                ui.note(_('Revision %d is a merge, ignoring...\n') % (rev,))

                return

            ctx1 = parents[0]

            lines = changedlines(ui, repo, ctx1, ctx, fns)

            rate[key] = [r + l for r, l in zip(rate.get(key, (0, 0)), lines)]

        state['count'] += 1

        ui.progress(_('analyzing'), state['count'], total=len(repo))

    for ctx in cmdutil.walkchangerevs(repo, m, opts, prep):

        continue

    ui.progress(_('analyzing'), None)

    return rate

def churn(ui, repo, *pats, **opts):

    '''histogram of changes to the repository

    This command will display a histogram representing the number

    of changed lines or revisions, grouped according to the given

    template. The default template will group changes by author.

    The --dateformat option may be used to group the results by

    date instead.

    Statistics are based on the number of changed lines, or

    alternatively the number of matching revisions if the

    --changesets option is specified.

    Examples::

      # display count of changed lines for every committer

      hg churn -t '{author|email}'

      # display daily activity graph

      hg churn -f '%H' -s -c

      # display activity of developers by month

      hg churn -f '%Y-%m' -s -c

      # display count of lines changed in every year

      hg churn -f '%Y' -s

    It is possible to map alternate email addresses to a main address

    by providing a file using the following format::

      <alias email> = <actual email>

    Such a file may be specified with the --aliases option, otherwise

    a .hgchurn file will be looked for in the working directory root.

    '''

    def pad(s, l):

        return (s + " " * l)[:l]

    amap = {}

    aliases = opts.get('aliases')

    if not aliases and os.path.exists(repo.wjoin('.hgchurn')):

        aliases = repo.wjoin('.hgchurn')

    if aliases:

        for l in open(aliases, "r"):

            alias, actual = l.split('=' in l and '=' or None, 1)

            amap[alias.strip()] = actual.strip()

    rate = countrate(ui, repo, amap, *pats, **opts).items()

    if not rate:

        return

    sortkey = ((not opts.get('sort')) and (lambda x: -sum(x[1])) or None)

    rate.sort(key=sortkey)

    # Be careful not to have a zero maxcount (issue833)

    maxcount = float(max(sum(v) for k, v in rate)) or 1.0

    maxname = max(len(k) for k, v in rate)

    ttywidth = util.termwidth()

    ui.debug("assuming %i character terminal\n" % ttywidth)

    width = ttywidth - maxname - 2 - 2 - 2

    if opts.get('diffstat'):

        width -= 15

        def format(name, (added, removed)):

            return "%s %15s %s%s\n" % (pad(name, maxname),

                                       '+%d/-%d' % (added, removed),

                                       ui.label('+' * charnum(added),

                                                'diffstat.inserted'),

                                       ui.label('-' * charnum(removed),

                                                'diffstat.deleted'))

    else:

        width -= 6

        def format(name, count):

            return "%s %6d %s\n" % (pad(name, maxname), sum(count),

                                    '*' * charnum(sum(count)))

    def charnum(count):

        return int(round(count * width / maxcount))

    for name, count in rate:

        ui.write(format(name, count))

cmdtable = {

    "churn":

        (churn,

          ('t', 'template', '{author|email}',

          ('f', 'dateformat', '',

          ('c', 'changesets', False, _('count rate by number of changesets')),

          ('s', 'sort', False, _('sort by key (default: sort by count)')),

          ('', 'diffstat', False, _('display added/removed lines separately')),

          ] + commands.walkopts,

         _("hg churn [-d DATE] [-r REV] [--aliases FILE] [FILE]")),

}