import os, re, traceback, sys

from mercurial import fancyopts, ui, hg

class UnknownCommand(Exception): pass

def relpath(repo, args):

    if os.getcwd() != repo.root:

        p = os.getcwd()[len(repo.root) + 1: ]

        return [ os.path.join(p, x) for x in args ]

    return args

def help(ui, cmd=None):

    '''show help'''

    if cmd:

        try:

            i = find(cmd)

            ui.write("%s\n\n" % i[2])

            ui.write(i[0].__doc__, "\n")

        except UnknownCommand:

            ui.warn("unknown command %s", cmd)

        sys.exit(0)

    ui.status("""\

 hg commands:

 add [files...]        add the given files in the next commit

 addremove             add all new files, delete all missing files

 annotate [files...]   show changeset number per file line

 branch <path>         create a branch of <path> in this directory

 checkout [changeset]  checkout the latest or given changeset

 commit                commit all changes to the repository

 diff [files...]       diff working directory (or selected files)

 dump <file> [rev]     dump the latest or given revision of a file

 dumpmanifest [rev]    dump the latest or given revision of the manifest

 export <rev>          dump the changeset header and diffs for a revision

 history               show changeset history

 init                  create a new repository in this directory

 log <file>            show revision history of a single file

 merge <path>          merge changes from <path> into local repository

 recover               rollback an interrupted transaction

 remove [files...]     remove the given files in the next commit

 serve                 export the repository via HTTP

 status                show new, missing, and changed files in working dir

 tags                  show current changeset tags

 undo                  undo the last transaction

""")

def init(ui):

    """create a repository"""

    hg.repository(ui, ".", create=1)

def checkout(u, repo, changeset=None):

    '''checkout a given changeset or the current tip'''

    node = repo.changelog.tip()

    if changeset:

        node = repo.lookup(changeset)

    repo.checkout(node)

def annotate(u, repo, *args, **ops):

    def getnode(rev):

        return hg.short(repo.changelog.node(rev))

    def getname(rev):

        try:

            return bcache[rev]

        except KeyError:

            cl = repo.changelog.read(repo.changelog.node(rev))

            name = cl[1]

            f = name.find('@')

            if f >= 0:

                name = name[:f]

            bcache[rev] = name

            return name

    bcache = {}

    opmap = [['user', getname], ['number', str], ['changeset', getnode]]

    if not ops['user'] and not ops['changeset']:

        ops['number'] = 1

    args = relpath(repo, args)

    node = repo.current

    if ops['revision']:

        node = repo.changelog.lookup(ops['revision'])

    change = repo.changelog.read(node)

    mmap = repo.manifest.read(change[0])

    maxuserlen = 0

    maxchangelen = 0

    for f in args:

        lines = repo.file(f).annotate(mmap[f])

        pieces = []

        for o, f in opmap:

            if ops[o]:

                l = [ f(n) for n,t in lines ]

                m = max(map(len, l))

                pieces.append([ "%*s" % (m, x) for x in l])

        for p,l in zip(zip(*pieces), lines):

            u.write(" ".join(p) + ": " + l[1])

def undo(ui, repo):

    repo.undo()

table = {

    "init": (init, [], 'hg init'),

    "help": (help, [], 'hg help [command]'),

    "checkout|co": (checkout, [], 'hg checkout [changeset]'),

    "ann|annotate": (annotate,

                     [('r', 'revision', '', 'revision'),

                      ('u', 'user', None, 'show user'),

                      ('n', 'number', None, 'show revision number'),

                      ('c', 'changeset', None, 'show changeset')],

                     'hg annotate [-u] [-c] [-n] [-r id] [files]'),

    "undo": (undo, [], 'hg undo'),

    }

norepo = "init branch help"

def find(cmd):

    i = None

    for e in table.keys():

        if re.match(e + "$", cmd):

            return table[e]

    raise UnknownCommand(cmd)

def dispatch(args):

    options = {}

    opts = [('v', 'verbose', None, 'verbose'),

            ('d', 'debug', None, 'debug'),

            ('q', 'quiet', None, 'quiet'),

            ('y', 'noninteractive', None, 'run non-interactively'),

            ]

    args = fancyopts.fancyopts(args, opts, options,

                               'hg [options] <command> [options] [files]')

    if not args:

        cmd = "help"

    else:

        cmd, args = args[0], args[1:]

    u = ui.ui(options["verbose"], options["debug"], options["quiet"],

           not options["noninteractive"])

    # deal with unfound commands later

    i = find(cmd)

    cmdoptions = {}

    args = fancyopts.fancyopts(args, i[1], cmdoptions, i[2])

    if cmd not in norepo.split():

        repo = hg.repository(ui = u)

        d = lambda: i[0](u, repo, *args, **cmdoptions)

    else:

        d = lambda: i[0](u, *args, **cmdoptions)

    try:

        d()

    except KeyboardInterrupt:

        u.warn("interrupted!\n")

    except TypeError, inst:

        # was this an argument error?

        tb = traceback.extract_tb(sys.exc_info()[2])

        if len(tb) > 2: # no

            raise

        u.warn("%s: invalid arguments\n" % i[0].__name__)

        u.warn("syntax: %s\n" % i[2])

        sys.exit(-1)