# formatter.py - generic output formatting for mercurial

#

# Copyright 2012 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 cPickle

import os

from .i18n import _

from .node import (

    hex,

    short,

)

from . import (

    encoding,

    error,

    templater,

)

class baseformatter(object):

    def __init__(self, ui, topic, opts):

        self._ui = ui

        self._topic = topic

        self._style = opts.get("style")

        self._template = opts.get("template")

        self._item = None

        # function to convert node to string suitable for this output

        self.hexfunc = hex

    def __nonzero__(self):

        '''return False if we're not doing real templating so we can

        skip extra work'''

        return True

    def _showitem(self):

        '''show a formatted item once all data is collected'''

        pass

    def startitem(self):

        '''begin an item in the format list'''

        if self._item is not None:

            self._showitem()

        self._item = {}

    def data(self, **data):

        '''insert data into item that's not shown in default output'''

        self._item.update(data)

    def write(self, fields, deftext, *fielddata, **opts):

        '''do default text output while assigning data to item'''

        fieldkeys = fields.split()

        assert len(fieldkeys) == len(fielddata)

        self._item.update(zip(fieldkeys, fielddata))

    def condwrite(self, cond, fields, deftext, *fielddata, **opts):

        '''do conditional write (primarily for plain formatter)'''

        fieldkeys = fields.split()

        assert len(fieldkeys) == len(fielddata)

        self._item.update(zip(fieldkeys, fielddata))

    def plain(self, text, **opts):

        '''show raw text for non-templated mode'''

        pass

    def end(self):

        '''end output for the formatter'''

        if self._item is not None:

            self._showitem()

class plainformatter(baseformatter):

    '''the default text output scheme'''

    def __init__(self, ui, topic, opts):

        baseformatter.__init__(self, ui, topic, opts)

        if ui.debugflag:

            self.hexfunc = hex

        else:

            self.hexfunc = short

    def __nonzero__(self):

        return False

    def startitem(self):

        pass

    def data(self, **data):

        pass

    def write(self, fields, deftext, *fielddata, **opts):

        self._ui.write(deftext % fielddata, **opts)

    def condwrite(self, cond, fields, deftext, *fielddata, **opts):

        '''do conditional write'''

        if cond:

            self._ui.write(deftext % fielddata, **opts)

    def plain(self, text, **opts):

        self._ui.write(text, **opts)

    def end(self):

        pass

class debugformatter(baseformatter):

    def __init__(self, ui, topic, opts):

        baseformatter.__init__(self, ui, topic, opts)

        self._ui.write("%s = [\n" % self._topic)

    def _showitem(self):

        self._ui.write("    " + repr(self._item) + ",\n")

    def end(self):

        baseformatter.end(self)

        self._ui.write("]\n")

class pickleformatter(baseformatter):

    def __init__(self, ui, topic, opts):

        baseformatter.__init__(self, ui, topic, opts)

        self._data = []

    def _showitem(self):

        self._data.append(self._item)

    def end(self):

        baseformatter.end(self)

        self._ui.write(cPickle.dumps(self._data))

def _jsonifyobj(v):

    if isinstance(v, tuple):

        return '[' + ', '.join(_jsonifyobj(e) for e in v) + ']'

    elif v is None:

        return 'null'

    elif v is True:

        return 'true'

    elif v is False:

        return 'false'

    elif isinstance(v, (int, float)):

        return str(v)

    else:

        return '"%s"' % encoding.jsonescape(v)

class jsonformatter(baseformatter):

    def __init__(self, ui, topic, opts):

        baseformatter.__init__(self, ui, topic, opts)

        self._ui.write("[")

        self._ui._first = True

    def _showitem(self):

        if self._ui._first:

            self._ui._first = False

        else:

            self._ui.write(",")

        self._ui.write("\n {\n")

        first = True

        for k, v in sorted(self._item.items()):

            if first:

                first = False

            else:

                self._ui.write(",\n")

            self._ui.write('  "%s": %s' % (k, _jsonifyobj(v)))

        self._ui.write("\n }")

    def end(self):

        baseformatter.end(self)

        self._ui.write("\n]\n")

class templateformatter(baseformatter):

    def __init__(self, ui, topic, opts):

        baseformatter.__init__(self, ui, topic, opts)

        self._topic = topic

        self._t = gettemplater(ui, topic, opts.get('template', ''))

    def _showitem(self):

        g = self._t(self._topic, ui=self._ui, **self._item)

        self._ui.write(templater.stringify(g))

def lookuptemplate(ui, topic, tmpl):

    # looks like a literal template?

    if '{' in tmpl:

        return tmpl, None

    # perhaps a stock style?

    if not os.path.split(tmpl)[0]:

        mapname = (templater.templatepath('map-cmdline.' + tmpl)

                   or templater.templatepath(tmpl))

        if mapname and os.path.isfile(mapname):

            return None, mapname

    # perhaps it's a reference to [templates]

    t = ui.config('templates', tmpl)

    if t:

        return templater.unquotestring(t), None

    if tmpl == 'list':

        ui.write(_("available styles: %s\n") % templater.stylelist())

        raise error.Abort(_("specify a template"))

    # perhaps it's a path to a map or a template

    if ('/' in tmpl or '\\' in tmpl) and os.path.isfile(tmpl):

        # is it a mapfile for a style?

        if os.path.basename(tmpl).startswith("map-"):

            return None, os.path.realpath(tmpl)

        tmpl = open(tmpl).read()

        return tmpl, None

    # constant string?

    return tmpl, None

def gettemplater(ui, topic, spec):

    tmpl, mapfile = lookuptemplate(ui, topic, spec)

    if tmpl:

        t.cache[topic] = tmpl

    return t

def formatter(ui, topic, opts):

    template = opts.get("template", "")

    if template == "json":

        return jsonformatter(ui, topic, opts)

    elif template == "pickle":

        return pickleformatter(ui, topic, opts)

    elif template == "debug":

        return debugformatter(ui, topic, opts)

    elif template != "":

        return templateformatter(ui, topic, opts)

    # developer config: ui.formatdebug

    elif ui.configbool('ui', 'formatdebug'):

        return debugformatter(ui, topic, opts)

    # deprecated config: ui.formatjson

    elif ui.configbool('ui', 'formatjson'):

        return jsonformatter(ui, topic, opts)

    return plainformatter(ui, topic, opts)