CLASS:: EmacsBuffer
summary:: Lightweight Emacs User Interface
categories:: Frontends

CLASSMETHODS::

METHOD:: new
Create a new Emacs buffer with the specified name.
If a buffer with the same name already exists, it is cleared.

ARGUMENT:: name
The name of the new buffer.
Convention has it that generated buffers (those which do not belong
to a file) should start and end with an asterisk *.

METHOD:: at
Retrieve an instance by its name.

ARGUMENT:: name
The name of the buffer.

INSTANCEMETHODS::

METHOD:: front
Switch to this buffer in Emacs, making it the current buffer.

CODE::
p = EmacsBuffer.new;
p.front;
::

METHOD:: defineKey

ARGUMENT:: keySeq
A key sequence.

ARGUMENT:: func
A function to call when that key sequence is invoked.

CODE::
// create a key action for the buffer:
p.defineKey( "hello", { "hey there".postln; } );

// type hello on the window and look at the postbuffer
p.front;

p.defineKey( "hey there", { "hello".postln; } );

// type hey there and look at the postbuffer
p.front;
::

METHOD:: insert
Insert text.

ARGUMENT:: string
The text which should be inserted.

CODE::
// put some text in the buffer:

p.insert( "this is a really interesting text to read in the buffer" );
p.front;
::

METHOD:: newline
Insert a newline.

CODE::
p.newline;
p.front;
::

METHOD:: gotoBob
Move the cursor (point in Emacs jargon) to thr beginning of the buffer.

METHOD:: gotoEob
Move point to the end of the buffer.

METHOD:: goto
Move point to a specific character position.

ARGUMENT:: position
An integer.

METHOD:: button
Create a multistate button.

ARGUMENT:: states
An array of state names.

ARGUMENT:: action
A function to call when the button state changes.

ARGUMENT:: prefix
Text to insert before the current state.

ARGUMENT:: suffix
Text to insert after the current state.

CODE::
// make a button:

p.button( [ "on", "off", "in between" ], { |v| v.postln; } );
p.front;

// make a button with a different look:
p.button( [ "on", "off", "in between" ], { |v| v.postln; }, "******", "+++++" );
p.front;
::

METHOD:: closeButton
Create a button which will close this buffer.

CODE::
p.closeButton;
p.front;
::

METHOD:: editableField
Create a field which can be edited inline.

ARGUMENT:: tag
The label of the field.

ARGUMENT:: value
The default content, a string.

ARGUMENT:: action
A function to call when the user submits the content by pressing enter.

CODE::
p = EmacsBuffer.new;
p.editableField( "write something here", "like this?", { |v| v.postln; } );
p.front;
::

METHOD:: free
Close this buffer.