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Chat Redesign: cleanup of obsolete parameters ('AppletHeight','AppletWidth','DefaultClient','ServerHost','ServerPort').

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Chat Redesign:

+ Skin support.

+ New 'ChatSkin' instance parameter, with currently two possible values: 'classic' and 'bubbles'.

+ Skins are located in the new packages/xowiki/www/resources/chat-skins/ directory.

+ New 'bubbles' skin, default for the chat package.

+ Old skin renamed to 'classic', default for the xowiki includelet.

+ New skins can be created by just adding the css and js files in the skins directory, and naming them accordingly. For example, being '$skin' the name of the new skin, the files should be named chat-$skin-common.js and chat-$skin.css.

+ New '-skin' parameter to the Chat login proc, containing the name of the skin (i.e. 'classic' or 'bubbles').

+ Bump version number.

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Provide a working way to configure the plain xowiki chat includelet:

at Chat class instantiation one can now specify a configuration dict that will be

persisted in an nsv and used to set option parameters (instance variables) such as login messages, logout messages

and the messages time window (and potentially other options in the future). This persistent configuration happpens whenever a client

logs in.

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Retract configurability for plain xowiki includelet as, without some way of persisisting the conf over subsequent object instantiations, would really not work and also ignore chat room configs

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Allow also plain xowiki includelet to specifiy if we want login and logout messages and the past messages time window through includelet parameters

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Chat reform:

- reduce code duplication by determining the proper chat class dynamically and storing it in an nsv

- move static content in the resources path. Serving them is now independent from the mounted xowiki path

- get rid of the ajax url path

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Give xowiki chat also some kind of nice skin and centralize css retrieval

TODO: something smarter can be done in order to retrieve the proper css, based e.g. on theme, chat skin (to be implemented) etc. To be discussed is some way to resolve resources based on the theme.

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New chat_room includelet, behaving as the existing chat one, but plugged with extra chat package's feature (transcript management...)

To avoid package_id to be overridden, we force it always to the one of the current chat

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When transcripting a message, use the provided user_id when available

This fixes auto logout messages being written down as from unregistered visitor in the transcript

Specialize the way chat::Chat class retrieves the package_id: use the context_id of the chat room (if this is a valid chat room)

This will allow to embed a chat::Chat instance in a xowiki page pinting to an existing chat room and let it use the chat package specific features to e.g. keep transcripts of a conversation

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Fade out obsolete code

Whitespace cleanup + Add editor hints

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Chat reform:

- rework xotcl-core chat machinery to return its responses through JSON and include information about active users

- depend on xowiki instead of xotcl-core only

- exploit xowiki "Comet" server push implementation when the browser supports it

- reduce code duplication

- drop plain HTML chat

- reduce hardcoded styling

- minor cleanups

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Converge render method for chat and xotcl-core package

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Add editor hints + Whitespace changes

Normalize indentation

Give templating a chance

move all hardcoded styling to the adp template, which might be styled by the theme. Also, biring some order in the login proc, e.g. don't open and read a file to include a javascript all the time.

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Modernize XoTcl idioms

Use finer grained api for user name

Retract package parameter configuration, as chat is not a singleton package... not clear if we will want a global paremeter for this in the future

Replace leftover Naviserver-only cache idioms with retro compatible ones

Create chat room cache in a way to provide compatibility with AOLserver

make timeout and cache size configurable.

Revert massive replacement of empty list creation sentences. The use of '[list]' instead of '{}' adds semantics that could be used for performance improvements in the future, such as using a different internal representation. There is already work in this direction, avoiding the generation of the string representation during comparison of empty strings (huge thanks to Stefan Sobernig for the pointer: https://core.tcl.tk/tcl/info/44527c632ed609c2).

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Rework variable assignment (set -> lassign) + Whitespace changes

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Prefer '{}' to '[list]' when creating empty lists

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fix typos

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merged changes from the oacs-5-9 branch and resolved conflicts

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Port some improvements from Learn@WU codebase:

- check whether chat room exists exploits cache

- chat room retrieval enriches with some acs_objects metadata

Fix potential errors when we try entering a chat room that has been deleted and check for its activity status

Don't lookup creator name for messages coming from the system, as they won't be found

Fix spelling errors

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