# templater.py - template expansion for output

#

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

#

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

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

from demandload import demandload

from i18n import gettext as _

from node import *

demandload(globals(), "cStringIO cgi re sys os time urllib util textwrap")

esctable = {

    '\\': '\\',

    'r': '\r',

    't': '\t',

    'n': '\n',

    'v': '\v',

    }

def parsestring(s, quoted=True):

    '''parse a string using simple c-like syntax.

    string must be in quotes if quoted is True.'''

    fp = cStringIO.StringIO()

    if quoted:

        first = s[0]

        if len(s) < 2: raise SyntaxError(_('string too short'))

        if first not in "'\"": raise SyntaxError(_('invalid quote'))

        if s[-1] != first: raise SyntaxError(_('unmatched quotes'))

        s = s[1:-1]

    escape = False

    for c in s:

        if escape:

            fp.write(esctable.get(c, c))

            escape = False

        elif c == '\\': escape = True

        elif quoted and c == first: raise SyntaxError(_('string ends early'))

        else: fp.write(c)

    if escape: raise SyntaxError(_('unterminated escape'))

    return fp.getvalue()

class templater(object):

    '''template expansion engine.

    template expansion works like this. a map file contains key=value

    pairs. if value is quoted, it is treated as string. otherwise, it

    is treated as name of template file.

    templater is asked to expand a key in map. it looks up key, and

    looks for atrings like this: {foo}. it expands {foo} by looking up

    foo in map, and substituting it. expansion is recursive: it stops

    when there is no more {foo} to replace.

    expansion also allows formatting and filtering.

    format uses key to expand each item in list. syntax is

    {key%format}.

    filter uses function to transform value. syntax is

    {key|filter1|filter2|...}.'''

    def __init__(self, mapfile, filters={}, defaults={}, cache={}):

        '''set up template engine.

        mapfile is name of file to read map definitions from.

        filters is dict of functions. each transforms a value into another.

        defaults is dict of default map definitions.'''

        self.mapfile = mapfile or 'template'

        self.cache = cache.copy()

        self.map = {}

        self.base = (mapfile and os.path.dirname(mapfile)) or ''

        self.filters = filters

        self.defaults = defaults

        if not mapfile:

            return

        i = 0

        for l in file(mapfile):

            l = l.strip()

            i += 1

            if not l or l[0] in '#;': continue

            m = re.match(r'([a-zA-Z_][a-zA-Z0-9_]*)\s*=\s*(.+)$', l)

            if m:

                key, val = m.groups()

                if val[0] in "'\"":

                    try:

                        self.cache[key] = parsestring(val)

                    except SyntaxError, inst:

                        raise SyntaxError('%s:%s: %s' %

                                          (mapfile, i, inst.args[0]))

                else:

                    self.map[key] = os.path.join(self.base, val)

            else:

                raise SyntaxError(_("%s:%s: parse error") % (mapfile, i))

    def __contains__(self, key):

        return key in self.cache

    def __call__(self, t, **map):

        '''perform expansion.

        t is name of map element to expand.

        map is added elements to use during expansion.'''

        m = self.defaults.copy()

        m.update(map)

        try:

            tmpl = self.cache[t]

        except KeyError:

            try:

                tmpl = self.cache[t] = file(self.map[t]).read()

            except IOError, inst:

                raise IOError(inst.args[0], _('template file %s: %s') %

                              (self.map[t], inst.args[1]))

        return self.template(tmpl, self.filters, **m)

    template_re = re.compile(r"[#{]([a-zA-Z_][a-zA-Z0-9_]*)"

                             r"((%[a-zA-Z_][a-zA-Z0-9_]*)*)"

                             r"((\|[a-zA-Z_][a-zA-Z0-9_]*)*)[#}]")

    def template(self, tmpl, filters={}, **map):

        lm = map.copy()

        while tmpl:

            m = self.template_re.search(tmpl)

            if m:

                start, end = m.span(0)

                s, e = tmpl[start], tmpl[end - 1]

                key = m.group(1)

                if ((s == '#' and e != '#') or (s == '{' and e != '}')):

                    raise SyntaxError(_("'%s'/'%s' mismatch expanding '%s'") %

                                      (s, e, key))

                if start:

                    yield tmpl[:start]

                v = map.get(key, "")

                v = callable(v) and v(**map) or v

                format = m.group(2)

                fl = m.group(4)

                if format:

                    q = v.__iter__

                    for i in q():

                        lm.update(i)

                        yield self(format[1:], **lm)

                    v = ""

                elif fl:

                    for f in fl.split("|")[1:]:

                        v = filters[f](v)

                yield v

                tmpl = tmpl[end:]

            else:

                yield tmpl

                break

agescales = [("second", 1),

             ("minute", 60),

             ("hour", 3600),

             ("day", 3600 * 24),

             ("week", 3600 * 24 * 7),

             ("month", 3600 * 24 * 30),

             ("year", 3600 * 24 * 365)]

agescales.reverse()

def age(date):

    '''turn a (timestamp, tzoff) tuple into an age string.'''

    def plural(t, c):

        if c == 1:

            return t

        return t + "s"

    def fmt(t, c):

        return "%d %s" % (c, plural(t, c))

    now = time.time()

    then = date[0]

    delta = max(1, int(now - then))

    for t, s in agescales:

        n = delta / s

        if n >= 2 or s == 1:

            return fmt(t, n)

def stringify(thing):

    '''turn nested template iterator into string.'''

    cs = cStringIO.StringIO()

    def walk(things):

        for t in things:

            if hasattr(t, '__iter__'):

                walk(t)

            else:

                cs.write(t)

    walk(thing)

    return cs.getvalue()

para_re = None

space_re = None

def fill(text, width):

    '''fill many paragraphs.'''

    global para_re, space_re

    if para_re is None:

        para_re = re.compile('(\n\n|\n\\s*[-*]\\s*)', re.M)

        space_re = re.compile(r'  +')

    def findparas():

        start = 0

        while True:

            m = para_re.search(text, start)

            if not m:

                w = len(text)

                while w > start and text[w-1].isspace(): w -= 1

                yield text[start:w], text[w:]

                break

            yield text[start:m.start(0)], m.group(1)

            start = m.end(1)

    fp = cStringIO.StringIO()

    for para, rest in findparas():

        fp.write(space_re.sub(' ', textwrap.fill(para, width)))

        fp.write(rest)

    return fp.getvalue()

def firstline(text):

    '''return the first line of text'''

    try:

        return text.splitlines(1)[0].rstrip('\r\n')

    except IndexError:

        return ''

def isodate(date):

    '''turn a (timestamp, tzoff) tuple into an iso 8631 date and time.'''

    return util.datestr(date, format='%Y-%m-%d %H:%M')

def hgdate(date):

    '''turn a (timestamp, tzoff) tuple into an hg cset timestamp.'''

    return "%d %d" % date

def nl2br(text):

    '''replace raw newlines with xhtml line breaks.'''

    return text.replace('\n', '<br/>\n')

def obfuscate(text):

    text = unicode(text, 'utf-8', 'replace')

    return ''.join(['&#%d;' % ord(c) for c in text])

def domain(author):

    '''get domain of author, or empty string if none.'''

    f = author.find('@')

    if f == -1: return ''

    author = author[f+1:]

    f = author.find('>')

    if f >= 0: author = author[:f]

    return author

def email(author):

    '''get email of author.'''

    r = author.find('>')

    if r == -1: r = None

    return author[author.find('<')+1:r]

def person(author):

    '''get name of author, or else username.'''

    f = author.find('<')

    if f == -1: return util.shortuser(author)

    return author[:f].rstrip()

def shortdate(date):

    '''turn (timestamp, tzoff) tuple into iso 8631 date.'''

    return util.datestr(date, format='%Y-%m-%d', timezone=False)

def indent(text, prefix):

    '''indent each non-empty line of text after first with prefix.'''

    fp = cStringIO.StringIO()

    lines = text.splitlines()

    num_lines = len(lines)

    for i in xrange(num_lines):

        l = lines[i]

        if i and l.strip(): fp.write(prefix)

        fp.write(l)

        if i < num_lines - 1 or text.endswith('\n'):

            fp.write('\n')

    return fp.getvalue()

common_filters = {

    "addbreaks": nl2br,

    "basename": os.path.basename,

    "age": age,

    "date": lambda x: util.datestr(x),

    "domain": domain,

    "email": email,

    "escape": lambda x: cgi.escape(x, True),

    "fill68": lambda x: fill(x, width=68),

    "fill76": lambda x: fill(x, width=76),

    "firstline": firstline,

    "tabindent": lambda x: indent(x, '\t'),

    "hgdate": hgdate,

    "isodate": isodate,

    "obfuscate": obfuscate,

    "permissions": lambda x: x and "-rwxr-xr-x" or "-rw-r--r--",

    "person": person,

    "rfc822date": lambda x: util.datestr(x, "%a, %d %b %Y %H:%M:%S"),

    "short": lambda x: x[:12],

    "shortdate": shortdate,

    "stringify": stringify,

    "strip": lambda x: x.strip(),

    "urlescape": lambda x: urllib.quote(x),

    "user": lambda x: util.shortuser(x),

    }

def templatepath(name=None):

    '''return location of template file or directory (if no name).

    returns None if not found.'''

    # executable version (py2exe) doesn't support __file__

    if hasattr(sys, 'frozen'):

        module = sys.executable

    else:

        module = __file__

    for f in 'templates', '../templates':

        fl = f.split('/')

        if name: fl.append(name)

        p = os.path.join(os.path.dirname(module), *fl)

        if (name and os.path.exists(p)) or os.path.isdir(p):

            return os.path.normpath(p)

class changeset_templater(object):

    '''format changeset information.'''

    def __init__(self, ui, repo, mapfile, dest=None):

        self.t = templater(mapfile, common_filters,

                           cache={'parent': '{rev}:{node|short} ',

                                  'manifest': '{rev}:{node|short}',

                                  'filecopy': '{name} ({source})'})

        self.ui = ui

        self.dest = dest

        self.repo = repo

    def use_template(self, t):

        '''set template string to use'''

        self.t.cache['changeset'] = t

    def write(self, thing, header=False):

        '''write expanded template.

        uses in-order recursive traverse of iterators.'''

        dest = self.dest or self.ui

        for t in thing:

            if hasattr(t, '__iter__'):

                self.write(t, header=header)

            elif header:

                dest.write_header(t)

            else:

                dest.write(t)

    def write_header(self, thing):

        self.write(thing, header=True)

    def show(self, rev=0, changenode=None, brinfo=None, changes=None,

             copies=[], **props):

        '''show a single changeset or file revision'''

        log = self.repo.changelog

        if changenode is None:

            changenode = log.node(rev)

        elif not rev:

            rev = log.rev(changenode)

        if changes is None:

            changes = log.read(changenode)

        def showlist(name, values, plural=None, **args):

            '''expand set of values.

            name is name of key in template map.

            values is list of strings or dicts.

            plural is plural of name, if not simply name + 's'.

            expansion works like this, given name 'foo'.

            if values is empty, expand 'no_foos'.

            if 'foo' not in template map, return values as a string,

            joined by space.

            expand 'start_foos'.

            for each value, expand 'foo'. if 'last_foo' in template

            map, expand it instead of 'foo' for last key.

            expand 'end_foos'.

            '''

            if plural: names = plural

            else: names = name + 's'

            if not values:

                noname = 'no_' + names

                if noname in self.t:

                    yield self.t(noname, **args)

                return

            if name not in self.t:

                if isinstance(values[0], str):

                    yield ' '.join(values)

                else:

                    for v in values:

                        yield dict(v, **args)

                return

            startname = 'start_' + names

            if startname in self.t:

                yield self.t(startname, **args)

            vargs = args.copy()

            def one(v, tag=name):

                try:

                    vargs.update(v)

                except (AttributeError, ValueError):

                    try:

                        for a, b in v:

                            vargs[a] = b

                    except ValueError:

                        vargs[name] = v

                return self.t(tag, **vargs)

            lastname = 'last_' + name

            if lastname in self.t:

                last = values.pop()

            else:

                last = None

            for v in values:

                yield one(v)

            if last is not None:

                yield one(last, tag=lastname)

            endname = 'end_' + names

            if endname in self.t:

                yield self.t(endname, **args)

        if brinfo:

            def showbranches(**args):

                if changenode in brinfo:

                    for x in showlist('branch', brinfo[changenode],

                                      plural='branches', **args):

                        yield x

        else:

            showbranches = ''

        if self.ui.debugflag:

            def showmanifest(**args):

                args = args.copy()

                args.update(dict(rev=self.repo.manifest.rev(changes[0]),

                                 node=hex(changes[0])))

                yield self.t('manifest', **args)

        else:

            showmanifest = ''

        def showparents(**args):

            parents = [[('rev', log.rev(p)), ('node', hex(p))]

                       for p in log.parents(changenode)

                       if self.ui.debugflag or p != nullid]

            if (not self.ui.debugflag and len(parents) == 1 and

                parents[0][0][1] == rev - 1):

                return

            for x in showlist('parent', parents, **args):

                yield x

        def showtags(**args):

            for x in showlist('tag', self.repo.nodetags(changenode), **args):

                yield x

        if self.ui.debugflag:

            files = self.repo.status(log.parents(changenode)[0], changenode)[:3]

            def showfiles(**args):

                for x in showlist('file', files[0], **args): yield x

            def showadds(**args):

                for x in showlist('file_add', files[1], **args): yield x

            def showdels(**args):

                for x in showlist('file_del', files[2], **args): yield x

        else:

            def showfiles(**args):

                for x in showlist('file', changes[3], **args): yield x

            showadds = ''

            showdels = ''

        copies = [{'name': x[0], 'source': x[1]}

                  for x in copies]

        def showcopies(**args):

            for x in showlist('file_copy', copies, plural='file_copies',

                              **args):

                yield x

        defprops = {

            'author': changes[1],

            'branches': showbranches,

            'date': changes[2],

            'desc': changes[4],

            'file_adds': showadds,

            'file_dels': showdels,

            'files': showfiles,

            'file_copies': showcopies,