# subrepoutil.py - sub-repository operations and substate handling

#

# Copyright 2009-2010 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.

from __future__ import absolute_import

import errno

import os

import posixpath

import re

from .i18n import _

from .pycompat import getattr

from . import (

    config,

    error,

    filemerge,

    pathutil,

    phases,

    pycompat,

    util,

)

from .utils import stringutil

nullstate = (b'', b'', b'empty')

def state(ctx, ui):

    """return a state dict, mapping subrepo paths configured in .hgsub

    to tuple: (source from .hgsub, revision from .hgsubstate, kind

    (key in types dict))

    """

    p = config.config()

    repo = ctx.repo()

    def read(f, sections=None, remap=None):

        if f in ctx:

            try:

                data = ctx[f].data()

            except IOError as err:

                if err.errno != errno.ENOENT:

                    raise

                # handle missing subrepo spec files as removed

                ui.warn(

                    _(b"warning: subrepo spec file \'%s\' not found\n")

                    % repo.pathto(f)

                )

                return

            p.parse(f, data, sections, remap, read)

        else:

            raise error.Abort(

                _(b"subrepo spec file \'%s\' not found") % repo.pathto(f)

            )

    if b'.hgsub' in ctx:

        read(b'.hgsub')

    for path, src in ui.configitems(b'subpaths'):

        p.set(b'subpaths', path, src, ui.configsource(b'subpaths', path))

    rev = {}

    if b'.hgsubstate' in ctx:

        try:

            for i, l in enumerate(ctx[b'.hgsubstate'].data().splitlines()):

                l = l.lstrip()

                if not l:

                    continue

                try:

                    revision, path = l.split(b" ", 1)

                except ValueError:

                    raise error.Abort(

                        _(

                            b"invalid subrepository revision "

                            b"specifier in \'%s\' line %d"

                        )

                        % (repo.pathto(b'.hgsubstate'), (i + 1))

                    )

                rev[path] = revision

        except IOError as err:

            if err.errno != errno.ENOENT:

                raise

    def remap(src):

        for pattern, repl in p.items(b'subpaths'):

            # Turn r'C:\foo\bar' into r'C:\\foo\\bar' since re.sub

            # does a string decode.

            repl = stringutil.escapestr(repl)

            # However, we still want to allow back references to go

            # through unharmed, so we turn r'\\1' into r'\1'. Again,

            # extra escapes are needed because re.sub string decodes.

            repl = re.sub(br'\\\\([0-9]+)', br'\\\1', repl)

            try:

                src = re.sub(pattern, repl, src, 1)

            except re.error as e:

                raise error.Abort(

                    _(b"bad subrepository pattern in %s: %s")

                    % (

                        p.source(b'subpaths', pattern),

                        stringutil.forcebytestr(e),

                    )

                )

        return src

    state = {}

    for path, src in p[b''].items():

        kind = b'hg'

        if src.startswith(b'['):

            if b']' not in src:

                raise error.Abort(_(b'missing ] in subrepository source'))

            kind, src = src.split(b']', 1)

            kind = kind[1:]

            src = src.lstrip()  # strip any extra whitespace after ']'

        if not util.url(src).isabs():

            parent = _abssource(repo, abort=False)

            if parent:

                parent = util.url(parent)

                parent.path = posixpath.join(parent.path or b'', src)

                parent.path = posixpath.normpath(parent.path)

                joined = bytes(parent)

                # Remap the full joined path and use it if it changes,

                # else remap the original source.

                remapped = remap(joined)

                if remapped == joined:

                    src = remap(src)

                else:

                    src = remapped

        src = remap(src)

        state[util.pconvert(path)] = (src.strip(), rev.get(path, b''), kind)

    return state

def writestate(repo, state):

    """rewrite .hgsubstate in (outer) repo with these subrepo states"""

    lines = [

        b'%s %s\n' % (state[s][1], s)

        for s in sorted(state)

        if state[s][1] != nullstate[1]

    ]

    repo.wwrite(b'.hgsubstate', b''.join(lines), b'')

def submerge(repo, wctx, mctx, actx, overwrite, labels=None):

    """delegated from merge.applyupdates: merging of .hgsubstate file

    in working context, merging context and ancestor context"""

    if mctx == actx:  # backwards?

        actx = wctx.p1()

    s1 = wctx.substate

    s2 = mctx.substate

    sa = actx.substate

    sm = {}

    repo.ui.debug(b"subrepo merge %s %s %s\n" % (wctx, mctx, actx))

    def debug(s, msg, r=b""):

        if r:

            r = b"%s:%s:%s" % r

        repo.ui.debug(b"  subrepo %s: %s %s\n" % (s, msg, r))

    promptssrc = filemerge.partextras(labels)

    for s, l in sorted(pycompat.iteritems(s1)):

        a = sa.get(s, nullstate)

        ld = l  # local state with possible dirty flag for compares

        if wctx.sub(s).dirty():

            ld = (l[0], l[1] + b"+")

        if wctx == actx:  # overwrite

            a = ld

        prompts = promptssrc.copy()

        prompts[b's'] = s

        if s in s2:

            r = s2[s]

            if ld == r or r == a:  # no change or local is newer

                sm[s] = l

                continue

            elif ld == a:  # other side changed

                debug(s, b"other changed, get", r)

                wctx.sub(s).get(r, overwrite)

                sm[s] = r

            elif ld[0] != r[0]:  # sources differ

                prompts[b'lo'] = l[0]

                prompts[b'ro'] = r[0]

                if repo.ui.promptchoice(

                    _(

                        b' subrepository sources for %(s)s differ\n'

                        b'you can use (l)ocal%(l)s source (%(lo)s)'

                        b' or (r)emote%(o)s source (%(ro)s).\n'

                        b'what do you want to do?'

                        b'$$ &Local $$ &Remote'

                    )

                    % prompts,

                    0,

                ):

                    debug(s, b"prompt changed, get", r)

                    wctx.sub(s).get(r, overwrite)

                    sm[s] = r

            elif ld[1] == a[1]:  # local side is unchanged

                debug(s, b"other side changed, get", r)

                wctx.sub(s).get(r, overwrite)

                sm[s] = r

            else:

                debug(s, b"both sides changed")

                srepo = wctx.sub(s)

                prompts[b'sl'] = srepo.shortid(l[1])

                prompts[b'sr'] = srepo.shortid(r[1])

                option = repo.ui.promptchoice(

                    _(

                        b' subrepository %(s)s diverged (local revision: %(sl)s, '

                        b'remote revision: %(sr)s)\n'

                        b'you can (m)erge, keep (l)ocal%(l)s or keep '

                        b'(r)emote%(o)s.\n'

                        b'what do you want to do?'

                        b'$$ &Merge $$ &Local $$ &Remote'

                    )

                    % prompts,

                    0,

                )

                if option == 0:

                    wctx.sub(s).merge(r)

                    sm[s] = l

                    debug(s, b"merge with", r)

                elif option == 1:

                    sm[s] = l

                    debug(s, b"keep local subrepo revision", l)

                else:

                    wctx.sub(s).get(r, overwrite)

                    sm[s] = r

                    debug(s, b"get remote subrepo revision", r)

        elif ld == a:  # remote removed, local unchanged

            debug(s, b"remote removed, remove")

            wctx.sub(s).remove()

        elif a == nullstate:  # not present in remote or ancestor

            debug(s, b"local added, keep")

            sm[s] = l

            continue

        else:

            if repo.ui.promptchoice(

                _(

                    b' local%(l)s changed subrepository %(s)s'

                    b' which remote%(o)s removed\n'

                    b'use (c)hanged version or (d)elete?'

                    b'$$ &Changed $$ &Delete'

                )

                % prompts,

                0,

            ):

                debug(s, b"prompt remove")

                wctx.sub(s).remove()

    for s, r in sorted(s2.items()):

        if s in s1:

            continue

        elif s not in sa:

            debug(s, b"remote added, get", r)

            mctx.sub(s).get(r)

            sm[s] = r

        elif r != sa[s]:

            prompts = promptssrc.copy()

            prompts[b's'] = s

            if (

                repo.ui.promptchoice(

                    _(

                        b' remote%(o)s changed subrepository %(s)s'

                        b' which local%(l)s removed\n'

                        b'use (c)hanged version or (d)elete?'

                        b'$$ &Changed $$ &Delete'

                    )

                    % prompts,

                    0,

                )

                == 0

            ):

                debug(s, b"prompt recreate", r)

                mctx.sub(s).get(r)

                sm[s] = r

    # record merged .hgsubstate

    writestate(repo, sm)

    return sm

def precommit(ui, wctx, status, match, force=False):

    """Calculate .hgsubstate changes that should be applied before committing

    Returns (subs, commitsubs, newstate) where

    - subs: changed subrepos (including dirty ones)

    - commitsubs: dirty subrepos which the caller needs to commit recursively

    - newstate: new state dict which the caller must write to .hgsubstate

    This also updates the given status argument.

    """

    subs = []

    commitsubs = set()

    newstate = wctx.substate.copy()

    # only manage subrepos and .hgsubstate if .hgsub is present

    if b'.hgsub' in wctx:

        # we'll decide whether to track this ourselves, thanks

        for c in status.modified, status.added, status.removed:

            if b'.hgsubstate' in c:

                c.remove(b'.hgsubstate')

        # compare current state to last committed state

        # build new substate based on last committed state

        oldstate = wctx.p1().substate

        for s in sorted(newstate.keys()):

            if not match(s):

                # ignore working copy, use old state if present

                if s in oldstate:

                    newstate[s] = oldstate[s]

                    continue

                if not force:

                    raise error.Abort(

                        _(b"commit with new subrepo %s excluded") % s

                    )

            dirtyreason = wctx.sub(s).dirtyreason(True)

            if dirtyreason:

                if not ui.configbool(b'ui', b'commitsubrepos'):

                    raise error.Abort(

                        dirtyreason,

                        hint=_(b"use --subrepos for recursive commit"),

                    )

                subs.append(s)

                commitsubs.add(s)

            else:

                bs = wctx.sub(s).basestate()

                newstate[s] = (newstate[s][0], bs, newstate[s][2])

                if oldstate.get(s, (None, None, None))[1] != bs:

                    subs.append(s)

        # check for removed subrepos

        for p in wctx.parents():

            r = [s for s in p.substate if s not in newstate]

            subs += [s for s in r if match(s)]

        if subs:

            if not match(b'.hgsub') and b'.hgsub' in (

                wctx.modified() + wctx.added()

            ):

                raise error.Abort(_(b"can't commit subrepos without .hgsub"))

            status.modified.insert(0, b'.hgsubstate')

    elif b'.hgsub' in status.removed:

        # clean up .hgsubstate when .hgsub is removed

        if b'.hgsubstate' in wctx and b'.hgsubstate' not in (

            status.modified + status.added + status.removed

        ):

            status.removed.insert(0, b'.hgsubstate')

    return subs, commitsubs, newstate

def reporelpath(repo):

    """return path to this (sub)repo as seen from outermost repo"""

    parent = repo

    while util.safehasattr(parent, b'_subparent'):

        parent = parent._subparent

    return repo.root[len(pathutil.normasprefix(parent.root)) :]