# help.py - help data for mercurial

#

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

#

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

# GNU General Public License version 2, incorporated herein by reference.

import os, sys

from i18n import _, gettext

import extensions

# borrowed from pydoc

def pathdirs():

    '''Convert sys.path into a list of absolute, existing, unique paths.'''

    dirs = []

    normdirs = []

    for dir in sys.path:

        dir = os.path.abspath(dir or '.')

        normdir = os.path.normcase(dir)

        if normdir not in normdirs and os.path.isdir(dir):

            dirs.append(dir)

            normdirs.append(normdir)

    return dirs

# loosely inspired by pydoc.source_synopsis()

# rewritten to handle ''' as well as """

# and to return the whole text instead of just the synopsis

def moduledoc(file):

    '''Return the top python documentation for the given file'''

    result = []

    line = file.readline()

    while line[:1] == '#' or not line.strip():

        line = file.readline()

        if not line: break

    start = line[:3]

    if start == '"""' or start == "'''":

        line = line[3:]

        while line:

            if line.rstrip().endswith(start):

                line = line.split(start)[0]

                if line:

                    result.append(line)

                break

            elif not line:

                return None # unmatched delimiter

            result.append(line)

            line = file.readline()

    else:

        return None

    return ''.join(result)

def additionalextensions():

    '''Find the extensions shipped with Mercurial but not enabled

    Returns extensions names and descriptions, and the max name length

    '''

    exts = {}

    maxlength = 0

    for dir in filter(os.path.isdir,

                      (os.path.join(pd, 'hgext') for pd in pathdirs())):

        for e in os.listdir(dir):

            if e.endswith('.py'):

                name = e.rsplit('.', 1)[0]

                path = os.path.join(dir, e)

            else:

                name = e

                path = os.path.join(dir, e, '__init__.py')

            if name in exts or name == '__init__' or not os.path.exists(path):

                continue

            try:

                extensions.find(name)

            except KeyError:

                pass

            else:

                continue # enabled extension

            try:

                file = open(path)

            except IOError:

                continue

            else:

                doc = moduledoc(file)

                file.close()

            if doc: # extracting localized synopsis

                exts[name] = gettext(doc).splitlines()[0]

            else:

                exts[name] = _('(no help text available)')

            if len(name) > maxlength:

                maxlength = len(name)

    return exts, maxlength

def topicextensions():

    doc = _(r'''

    Mercurial has an extension mechanism for adding new features.

    To enable an extension "foo" bundled with Mercurial, create an

    entry for it your hgrc, like this:

       [extensions]

       foo =

    ''')

    exts, maxlength = additionalextensions()

    return doc

helptable = (

    (["dates"], _("Date Formats"),

     _(r'''

    Some commands allow the user to specify a date, e.g.:

    * backout, commit, import, tag: Specify the commit date.

    * log, revert, update: Select revision(s) by date.

    Many date formats are valid. Here are some examples:

    "Wed Dec 6 13:18:29 2006" (local timezone assumed)

    "Dec 6 13:18 -0600" (year assumed, time offset provided)

    "Dec 6 13:18 UTC" (UTC and GMT are aliases for +0000)

    "Dec 6" (midnight)

    "13:18" (today assumed)

    "3:39" (3:39AM assumed)

    "3:39pm" (15:39)

    "2006-12-06 13:18:29" (ISO 8601 format)

    "2006-12-6 13:18"

    "2006-12-6"

    "12-6"

    "12/6"

    "12/6/6" (Dec 6 2006)

    Lastly, there is Mercurial's internal format:

    "1165432709 0" (Wed Dec 6 13:18:29 2006 UTC)

    This is the internal representation format for dates. unixtime is

    the number of seconds since the epoch (1970-01-01 00:00 UTC).

    offset is the offset of the local timezone, in seconds west of UTC

    (negative if the timezone is east of UTC).

    The log command also accepts date ranges:

    "<{datetime}" - at or before a given date/time

    ">{datetime}" - on or after a given date/time

    "{datetime} to {datetime}" - a date range, inclusive

    "-{days}" - within a given number of days of today

    ''')),

    (["patterns"], _("File Name Patterns"),

     _(r'''

    Mercurial accepts several notations for identifying one or more

    files at a time.

    By default, Mercurial treats filenames as shell-style extended

    glob patterns.

    Alternate pattern notations must be specified explicitly.

    To use a plain path name without any pattern matching, start it

    with "path:". These path names must completely match starting at

    the current repository root.

    To use an extended glob, start a name with "glob:". Globs are

    rooted at the current directory; a glob such as "*.c" will only

    match files in the current directory ending with ".c".

    The supported glob syntax extensions are "**" to match any string

    across path separators and "{a,b}" to mean "a or b".

    To use a Perl/Python regular expression, start a name with "re:".

    Regexp pattern matching is anchored at the root of the repository.

    Plain examples:

    path:foo/bar   a name bar in a directory named foo in the root of

                   the repository

    path:path:name a file or directory named "path:name"

    Glob examples:

    glob:*.c       any name ending in ".c" in the current directory

    *.c            any name ending in ".c" in the current directory

    **.c           any name ending in ".c" in any subdirectory of the

                   current directory including itself.

    foo/*.c        any name ending in ".c" in the directory foo

    foo/**.c       any name ending in ".c" in any subdirectory of foo

                   including itself.

    Regexp examples:

    re:.*\.c$      any name ending in ".c", anywhere in the repository

    ''')),

    (['environment', 'env'], _('Environment Variables'),

     _(r'''

HG::

    Path to the 'hg' executable, automatically passed when running

    hooks, extensions or external tools. If unset or empty, this is

    the hg executable's name if it's frozen, or an executable named

    'hg' (with %PATHEXT% [defaulting to COM/EXE/BAT/CMD] extensions on

    Windows) is searched.

HGEDITOR::

    This is the name of the editor to run when committing. See EDITOR.

    (deprecated, use .hgrc)

HGENCODING::

    This overrides the default locale setting detected by Mercurial.

    This setting is used to convert data including usernames,

    changeset descriptions, tag names, and branches. This setting can

    be overridden with the --encoding command-line option.

HGENCODINGMODE::

    This sets Mercurial's behavior for handling unknown characters

    while transcoding user input. The default is "strict", which

    causes Mercurial to abort if it can't map a character. Other

    settings include "replace", which replaces unknown characters, and

    "ignore", which drops them. This setting can be overridden with

    the --encodingmode command-line option.

HGMERGE::

    An executable to use for resolving merge conflicts. The program

    will be executed with three arguments: local file, remote file,

    ancestor file.

    (deprecated, use .hgrc)

HGRCPATH::

    A list of files or directories to search for hgrc files. Item

    separator is ":" on Unix, ";" on Windows. If HGRCPATH is not set,

    platform default search path is used. If empty, only the .hg/hgrc

    from the current repository is read.

    For each element in HGRCPATH:

    * if it's a directory, all files ending with .rc are added

    * otherwise, the file itself will be added

HGUSER::

    This is the string used as the author of a commit. If not set,

    available values will be considered in this order:

    * HGUSER (deprecated)

    * hgrc files from the HGRCPATH

    * EMAIL

    * interactive prompt

    * LOGNAME (with '@hostname' appended)

    (deprecated, use .hgrc)

EMAIL::

    May be used as the author of a commit; see HGUSER.

LOGNAME::

    May be used as the author of a commit; see HGUSER.

VISUAL::

    This is the name of the editor to use when committing. See EDITOR.

EDITOR::

    Sometimes Mercurial needs to open a text file in an editor for a

    user to modify, for example when writing commit messages. The

    editor it uses is determined by looking at the environment

    variables HGEDITOR, VISUAL and EDITOR, in that order. The first

    non-empty one is chosen. If all of them are empty, the editor

    defaults to 'vi'.

PYTHONPATH::

    This is used by Python to find imported modules and may need to be

    set appropriately if this Mercurial is not installed system-wide.

    ''')),

    (['revs', 'revisions'], _('Specifying Single Revisions'),

     _(r'''

    Mercurial supports several ways to specify individual revisions.

    A plain integer is treated as a revision number. Negative integers

    are treated as topological offsets from the tip, with -1 denoting

    the tip. As such, negative numbers are only useful if you've

    memorized your local tree numbers and want to save typing a single

    digit. This editor suggests copy and paste.

    A 40-digit hexadecimal string is treated as a unique revision

    identifier.

    A hexadecimal string less than 40 characters long is treated as a

    unique revision identifier, and referred to as a short-form

    identifier. A short-form identifier is only valid if it is the

    prefix of exactly one full-length identifier.

    Any other string is treated as a tag name, which is a symbolic

    name associated with a revision identifier. Tag names may not

    contain the ":" character.

    The reserved name "tip" is a special tag that always identifies

    the most recent revision.

    The reserved name "null" indicates the null revision. This is the

    revision of an empty repository, and the parent of revision 0.

    The reserved name "." indicates the working directory parent. If

    no working directory is checked out, it is equivalent to null. If

    an uncommitted merge is in progress, "." is the revision of the

    first parent.

    ''')),

    (['mrevs', 'multirevs'], _('Specifying Multiple Revisions'),

     _(r'''

    When Mercurial accepts more than one revision, they may be

    specified individually, or provided as a topologically continuous

    range, separated by the ":" character.

    The syntax of range notation is [BEGIN]:[END], where BEGIN and END

    are revision identifiers. Both BEGIN and END are optional. If

    BEGIN is not specified, it defaults to revision number 0. If END

    is not specified, it defaults to the tip. The range ":" thus means

    "all revisions".

    If BEGIN is greater than END, revisions are treated in reverse

    order.

    A range acts as a closed interval. This means that a range of 3:5

    gives 3, 4 and 5. Similarly, a range of 9:6 gives 9, 8, 7, and 6.

    ''')),

    (['diffs'], _('Diff Formats'),

     _(r'''

    Mercurial's default format for showing changes between two

    versions of a file is compatible with the unified format of GNU

    diff, which can be used by GNU patch and many other standard

    tools.

    While this standard format is often enough, it does not encode the

    following information:

     - executable status and other permission bits

     - copy or rename information

     - changes in binary files

     - creation or deletion of empty files

    Mercurial also supports the extended diff format from the git VCS

    which addresses these limitations. The git diff format is not

    produced by default because a few widespread tools still do not

    understand this format.

    This means that when generating diffs from a Mercurial repository

    (e.g. with "hg export"), you should be careful about things like

    file copies and renames or other things mentioned above, because

    when applying a standard diff to a different repository, this

    extra information is lost. Mercurial's internal operations (like

    push and pull) are not affected by this, because they use an

    internal binary format for communicating changes.

    To make Mercurial produce the git extended diff format, use the

    --git option available for many commands, or set 'git = True' in

    the [diff] section of your hgrc. You do not need to set this

    option when importing diffs in this format or using them in the mq

    extension.

    ''')),

    (['templating'], _('Template Usage'),

     _(r'''

    Mercurial allows you to customize output of commands through

    templates. You can either pass in a template from the command

    line, via the --template option, or select an existing

    template-style (--style).

    You can customize output for any "log-like" command: log,

    outgoing, incoming, tip, parents, heads and glog.

    Three styles are packaged with Mercurial: default (the style used

    when no explicit preference is passed), compact and changelog.

    Usage:

        $ hg log -r1 --style changelog

    A template is a piece of text, with markup to invoke variable

    expansion:

        $ hg log -r1 --template "{node}\n"

        b56ce7b07c52de7d5fd79fb89701ea538af65746

    Strings in curly braces are called keywords. The availability of

    keywords depends on the exact context of the templater. These

    keywords are usually available for templating a log-like command:

    - author: String. The unmodified author of the changeset.

    - branches: String. The name of the branch on which the changeset

          was committed. Will be empty if the branch name was default.

    - date: Date information. The date when the changeset was committed.

    - desc: String. The text of the changeset description.

    - diffstat: String. Statistics of changes with the following

          format: "modified files: +added/-removed lines"

    - files: List of strings. All files modified, added, or removed by

          this changeset.

    - file_adds: List of strings. Files added by this changeset.

    - file_mods: List of strings. Files modified by this changeset.

    - file_dels: List of strings. Files removed by this changeset.

    - node: String. The changeset identification hash, as a

          40-character hexadecimal string.

    - parents: List of strings. The parents of the changeset.

    - rev: Integer. The repository-local changeset revision number.

    - tags: List of strings. Any tags associated with the changeset.

    The "date" keyword does not produce human-readable output. If you

    want to use a date in your output, you can use a filter to process

    it. Filters are functions which return a string based on the input

    variable. You can also use a chain of filters to get the desired

    output:

       $ hg tip --template "{date|isodate}\n"

       2008-08-21 18:22 +0000

    List of filters:

    - addbreaks: Any text. Add an XHTML "<br />" tag before the end of

          every line except the last.

    - age: Date. Returns a human-readable date/time difference between

          the given date/time and the current date/time.

    - basename: Any text. Treats the text as a path, and returns the

          last component of the path after splitting by the path

          separator (ignoring trailing separators). For example,

          "foo/bar/baz" becomes "baz" and "foo/bar//" becomes "bar".

    - stripdir: Treat the text as path and strip a directory level, if

          possible. For example, "foo" and "foo/bar" becomes "foo".

    - date: Date. Returns a date in a Unix date format, including

          the timezone: "Mon Sep 04 15:13:13 2006 0700".

    - domain: Any text. Finds the first string that looks like an

          email address, and extracts just the domain component.

          Example: 'User <user@example.com>' becomes 'example.com'.

    - email: Any text. Extracts the first string that looks like an

          email address. Example: 'User <user@example.com>' becomes

          'user@example.com'.

    - escape: Any text. Replaces the special XML/XHTML characters "&",

          "<" and ">" with XML entities.

    - fill68: Any text. Wraps the text to fit in 68 columns.

    - fill76: Any text. Wraps the text to fit in 76 columns.

    - firstline: Any text. Returns the first line of text.

    - nonempty: Any text. Returns '(none)' if the string is empty.

    - hgdate: Date. Returns the date as a pair of numbers:

          "1157407993 25200" (Unix timestamp, timezone offset).

    - isodate: Date. Returns the date in ISO 8601 format.

    - localdate: Date. Converts a date to local date.

    - obfuscate: Any text. Returns the input text rendered as a

          sequence of XML entities.

    - person: Any text. Returns the text before an email address.

    - rfc822date: Date. Returns a date using the same format used