# 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 __future__ import absolute_import, division

import datetime

import os

import time

from mercurial.i18n import _

from mercurial.pycompat import open

from mercurial import (

    cmdutil,

    encoding,

    logcmdutil,

    patch,

    pycompat,

    registrar,

    scmutil,

)

cmdtable = {}

command = registrar.command(cmdtable)

# 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 = b'ships-with-hg-core'

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

    added, removed = 0, 0

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

    inhunk = False

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

        if inhunk and l.startswith(b"+"):

            added += 1

        elif inhunk and l.startswith(b"-"):

            removed += 1

        elif l.startswith(b"@"):

            inhunk = True

        elif l.startswith(b"d"):

            inhunk = False

    return (added, removed)

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

    """Calculate stats"""

    opts = pycompat.byteskwargs(opts)

    if opts.get(b'dateformat'):

        def getkey(ctx):

            t, tz = ctx.date()

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

            return encoding.strtolocal(

                date.strftime(encoding.strfromlocal(opts[b'dateformat']))

            )

    else:

        tmpl = opts.get(b'oldtemplate') or opts.get(b'template')

        tmpl = logcmdutil.maketemplater(ui, repo, tmpl)

        def getkey(ctx):

            ui.pushbuffer()

            tmpl.show(ctx)

            return ui.popbuffer()

    progress = ui.makeprogress(

        _(b'analyzing'), unit=_(b'revisions'), total=len(repo)

    )

    rate = {}

    def prep(ctx, fmatch):

        rev = ctx.rev()

        key = getkey(ctx).strip()

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

        if opts.get(b'changesets'):

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

        else:

            parents = ctx.parents()

            if len(parents) > 1:

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

                return

            ctx1 = parents[0]

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

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

        progress.increment()

    wopts = logcmdutil.walkopts(

        pats=pats,

        opts=opts,

        revspec=opts[b'rev'],

        date=opts[b'date'],

        include_pats=opts[b'include'],

        exclude_pats=opts[b'exclude'],

    )

    revs, makefilematcher = logcmdutil.makewalker(repo, wopts)

    for ctx in scmutil.walkchangerevs(repo, revs, makefilematcher, prep):

        continue

    progress.complete()

    return rate

@command(

    b'churn',

    [

        (

            b'r',

            b'rev',

            [],

            _(b'count rate for the specified revision or revset'),

            _(b'REV'),

        ),

        (

            b'd',

            b'date',

            b'',

            _(b'count rate for revisions matching date spec'),

            _(b'DATE'),

        ),

        (

            b't',

            b'oldtemplate',

            b'',

            _(b'template to group changesets (DEPRECATED)'),

            _(b'TEMPLATE'),

        ),

        (

            b'T',

            b'template',

            b'{author|email}',

            _(b'template to group changesets'),

            _(b'TEMPLATE'),

        ),

        (

            b'f',

            b'dateformat',

            b'',

            _(b'strftime-compatible format for grouping by date'),

            _(b'FORMAT'),

        ),

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

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

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

        (b'', b'aliases', b'', _(b'file with email aliases'), _(b'FILE')),

    ]

    + cmdutil.walkopts,

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

    helpcategory=command.CATEGORY_MAINTENANCE,

    inferrepo=True,

)

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

      # display count of lines changed in a time range

      hg churn -d "2020-04 to 2020-09"

    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.

    Aliases will be split from the rightmost "=".

    """

    def pad(s, l):

        return s + b" " * (l - encoding.colwidth(s))

    amap = {}

    aliases = opts.get('aliases')

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

        aliases = repo.wjoin(b'.hgchurn')

    if aliases:

        for l in open(aliases, b"rb"):

            try:

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

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

            except ValueError:

                l = l.strip()

                if l:

                    ui.warn(_(b"skipping malformed alias: %s\n") % l)

                continue

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

    if not rate:

        return

    if opts.get('sort'):

        rate.sort()

    else:

        rate.sort(key=lambda x: (-sum(x[1]), x))

    # 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 = ui.termwidth()

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

    width = ttywidth - maxname - 2 - 2 - 2

    if opts.get('diffstat'):

        width -= 15

        def format(name, diffstat):

            added, removed = diffstat

            return b"%s %15s %s%s\n" % (

                pad(name, maxname),

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

                ui.label(b'+' * charnum(added), b'diffstat.inserted'),

                ui.label(b'-' * charnum(removed), b'diffstat.deleted'),

            )

    else:

        width -= 6

        def format(name, count):

            return b"%s %6d %s\n" % (

                pad(name, maxname),

                sum(count),

                b'*' * charnum(sum(count)),

            )

    def charnum(count):

        return int(count * width // maxcount)

    for name, count in rate:

        ui.write(format(name, count))