# hgweb/webutil.py - utility library for the web interface.

#

# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>

# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

#

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

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

import os, copy

from mercurial import match, patch, util, error

from mercurial.node import hex, nullid

def up(p):

    if p[0] != "/":

        p = "/" + p

    if p[-1] == "/":

        p = p[:-1]

    up = os.path.dirname(p)

    if up == "/":

        return "/"

    return up + "/"

def revnavgen(pos, pagelen, limit, nodefunc):

    def seq(factor, limit=None):

        if limit:

            yield limit

            if limit >= 20 and limit <= 40:

                yield 50

        else:

            yield 1 * factor

            yield 3 * factor

        for f in seq(factor * 10):

            yield f

    navbefore = []

    navafter = []

    last = 0

    for f in seq(1, pagelen):

        if f < pagelen or f <= last:

            continue

        if f > limit:

            break

        last = f

        if pos + f < limit:

            navafter.append(("+%d" % f, hex(nodefunc(pos + f).node())))

        if pos - f >= 0:

            navbefore.insert(0, ("-%d" % f, hex(nodefunc(pos - f).node())))

    navafter.append(("tip", "tip"))

    try:

        navbefore.insert(0, ("(0)", hex(nodefunc('0').node())))

    except error.RepoError:

        pass

    def gen(l):

        def f(**map):

            for label, node in l:

                yield {"label": label, "node": node}

        return f

    return (dict(before=gen(navbefore), after=gen(navafter)), )

def _siblings(siblings=[], hiderev=None):

    siblings = [s for s in siblings if s.node() != nullid]

    if len(siblings) == 1 and siblings[0].rev() == hiderev:

        return

    for s in siblings:

        d = {'node': hex(s.node()), 'rev': s.rev()}

        d['user'] = s.user()

        d['date'] = s.date()

        d['description'] = s.description()

        d['branch'] = s.branch()

        if hasattr(s, 'path'):

            d['file'] = s.path()

        yield d

def parents(ctx, hide=None):

    return _siblings(ctx.parents(), hide)

def children(ctx, hide=None):

    return _siblings(ctx.children(), hide)

def renamelink(fctx):

    r = fctx.renamed()

    if r:

        return [dict(file=r[0], node=hex(r[1]))]

    return []

def nodetagsdict(repo, node):

    return [{"name": i} for i in repo.nodetags(node)]

def nodebranchdict(repo, ctx):

    branches = []

    branch = ctx.branch()

    # If this is an empty repo, ctx.node() == nullid,

    # ctx.branch() == 'default', but branchtags() is

    # an empty dict. Using dict.get avoids a traceback.

    if repo.branchtags().get(branch) == ctx.node():

        branches.append({"name": branch})

    return branches

def nodeinbranch(repo, ctx):

    branches = []

    branch = ctx.branch()

    if branch != 'default' and repo.branchtags().get(branch) != ctx.node():

        branches.append({"name": branch})

    return branches

def nodebranchnodefault(ctx):

    branches = []

    branch = ctx.branch()

    if branch != 'default':

        branches.append({"name": branch})

    return branches

def showtag(repo, tmpl, t1, node=nullid, **args):

    for t in repo.nodetags(node):

        yield tmpl(t1, tag=t, **args)

def cleanpath(repo, path):

    path = path.lstrip('/')

    return util.canonpath(repo.root, '', path)

def changectx(repo, req):

    changeid = "tip"

    if 'node' in req.form:

        changeid = req.form['node'][0]

    elif 'manifest' in req.form:

        changeid = req.form['manifest'][0]

    try:

        ctx = repo[changeid]

    except error.RepoError:

        man = repo.manifest

        ctx = repo[man.linkrev(man.rev(man.lookup(changeid)))]

    return ctx

def filectx(repo, req):

    path = cleanpath(repo, req.form['file'][0])

    if 'node' in req.form:

        changeid = req.form['node'][0]

    else:

        changeid = req.form['filenode'][0]

    try:

        fctx = repo[changeid][path]

    except error.RepoError:

        fctx = repo.filectx(path, fileid=changeid)

    return fctx

def listfilediffs(tmpl, files, node, max):

    for f in files[:max]:

        yield tmpl('filedifflink', node=hex(node), file=f)

    if len(files) > max:

        yield tmpl('fileellipses')

def diffs(repo, tmpl, ctx, files, parity, style):

    def countgen():

        start = 1

        while True:

            yield start

            start += 1

    blockcount = countgen()

    def prettyprintlines(diff):

        blockno = blockcount.next()

        for lineno, l in enumerate(diff.splitlines(True)):

            lineno = "%d.%d" % (blockno, lineno + 1)

            if l.startswith('+'):

                ltype = "difflineplus"

            elif l.startswith('-'):

                ltype = "difflineminus"

            elif l.startswith('@'):

                ltype = "difflineat"

            else:

                ltype = "diffline"

            yield tmpl(ltype,

                       line=l,

                       lineid="l%s" % lineno,

                       linenumber="% 8s" % lineno)

    if files:

        m = match.exact(repo.root, repo.getcwd(), files)

    else:

        m = match.always(repo.root, repo.getcwd())

    diffopts = patch.diffopts(repo.ui, untrusted=True)

    parents = ctx.parents()

    node1 = parents and parents[0].node() or nullid

    node2 = ctx.node()

    block = []

    for chunk in patch.diff(repo, node1, node2, m, opts=diffopts):

        if chunk.startswith('diff') and block:

            yield tmpl('diffblock', parity=parity.next(),

                       lines=prettyprintlines(''.join(block)))

            block = []

        if chunk.startswith('diff') and style != 'raw':

            chunk = ''.join(chunk.splitlines(True)[1:])

        block.append(chunk)

    yield tmpl('diffblock', parity=parity.next(),

               lines=prettyprintlines(''.join(block)))

class sessionvars(object):

    def __init__(self, vars, start='?'):

        self.start = start

        self.vars = vars

    def __getitem__(self, key):

        return self.vars[key]

    def __setitem__(self, key, value):

        self.vars[key] = value

    def __copy__(self):

        return sessionvars(copy.copy(self.vars), self.start)

    def __iter__(self):

        separator = self.start

        for key, value in self.vars.iteritems():

            yield {'name': key, 'value': str(value), 'separator': separator}

            separator = '&'