# churn.py - create a graph showing who changed the most lines

#

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

#

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

# of the GNU General Public License, incorporated herein by reference.

#

#

# Aliases map file format is simple one alias per line in the following

# format:

#

# <alias email> <actual email>

import time, sys, signal, os

from mercurial import hg, mdiff, fancyopts, commands, ui, util, templater

def __gather(ui, repo, node1, node2):

    def dirtywork(f, mmap1, mmap2):

        lines = 0

        to = None

        if mmap1:

            to = repo.file(f).read(mmap1[f])

        tn = None

        if mmap2:

            tn = repo.file(f).read(mmap2[f])

        diff = mdiff.unidiff(to, "", tn, "", f).split("\n")

        for line in diff:

            if len(line) <= 0:

                continue # skip EOF

            if line[0] == " ":

                continue # context line

            if line[0:4] == "--- " or line[0:4] == "+++ ":

                continue # begining of diff

            if line[0:3] == "@@ ":

                continue # info line

            # changed lines

            lines += 1

        return lines

    ##

    lines = 0

    changes = repo.changes(node1, node2, None, util.always)

    modified, added, removed, deleted, unknown = changes

    who = repo.changelog.read(node2)[1]

    who = templater.email(who) # get the email of the person

    mmap1 = repo.manifest.read(repo.changelog.read(node1)[0])

    mmap2 = repo.manifest.read(repo.changelog.read(node2)[0])

    for f in modified:

        lines += dirtywork(f, mmap1, mmap2)

    for f in added:

        lines += dirtywork(f, None, mmap2)

    for f in removed:

        lines += dirtywork(f, mmap1, None)

    for f in deleted:

        lines += dirtywork(f, mmap1, mmap2)

    for f in unknown:

        lines += dirtywork(f, mmap1, mmap2)

    return (who, lines)

def gather_stats(ui, repo, amap):

    stats = {}

    cl    = repo.changelog

    for rev in range(1,cl.count()):

        node2    = cl.node(rev)

        node1    = cl.parents(node2)[0]

        who, lines = __gather(ui, repo, node1, node2)

        # remap the owner if possible

        if amap.has_key(who):

            ui.note("using '%s' alias for '%s'\n" % (amap[who], who))

            who = amap[who]

        if not stats.has_key(who):

            stats[who] = 0

        stats[who] += lines

        ui.note("rev %d: %d lines by %s\n" % (rev, lines, who))

    return stats

def churn(ui, repo, aliases):

    "Graphs the number of lines changed"

    def pad(s, l):

        if len(s) < l:

            return s + " " * (l-len(s))

        return s[0:l]

    def graph(n, maximum, width, char):

        n = int(n * width / float(maximum))

        return char * (n)

    def get_aliases(f):

        aliases = {}

        for l in f.readlines():

            l = l.strip()

            alias, actual = l.split(" ")

            aliases[alias] = actual

        return aliases

    amap = {}

    if aliases:

        try:

            f = open(aliases,"r")

        except OSError, e:

            print "Error: " + e

            return

        amap = get_aliases(f)

        f.close()

    os.chdir(repo.root)

    stats = gather_stats(ui, repo, amap)

    # make a list of tuples (name, lines) and sort it in descending order

    ordered = stats.items()

    ordered.sort(cmp=lambda x,y:cmp(x[1], y[1]))

    ordered.reverse()

    maximum = ordered[0][1]

    ui.note("Assuming 80 character terminal\n")

    width = 80 - 1

    for i in ordered:

        person = i[0]

        lines = i[1]

        print "%s %6d %s" % (pad(person, 20), lines,

                graph(lines, maximum, width - 20 - 1 - 6 - 2 - 2, '*'))

cmdtable = {

    "churn":

    (churn,

     [('', 'aliases', '', 'file with email aliases')],

    'hg churn [-a file]'),

}

def reposetup(ui, repo):

    pass