SciTE Key Command Manager by Mitchell
    email: mitchell {att} caladbolg {dott} net

  Copyright (c) 2006-2007 Mitchell Foral. All rights reserved.

  SciTE-tools homepage: http://caladbolg.net/scite.php
  Send email to: mitchell<att>caladbolg<dott>net

  Permission to use, copy, modify, and distribute this
  utility is granted, provided credit is given to Mitchell.

  SciTE's key commands are quite customizable as it is, but not quite as
  dynamic as they could be.

  There is no other editor that comes close to matching Textmate (sadly, MacOSX
  only) but SciTE. Of course, SciTE in its default state doesn't, but with Lua,
  it can. This key command managing system is designed to come close to
  mimicking Textmate, although it will never be a perfect clone.

  Syntax:
    Key commands are defined in a user-defined table 'keys'. Scopes and Lexers
    (discussed below) are numeric indices of the keys table and are tables
    themselves. Each string index in each of these tables is the key command.
    The table containing the command to execute and an optional parameter is
    equated to this key command. You can have global key commands of course.

    For example:
    local m_editing = modules.scite.editing
    local m_snippets = modules.scite.snippets
    keys = {
      ['ctrl+f']   = { editor.CharRight, editor },
      ['ctrl+b']   = { editor.CharLeft,  editor },
      [SCLEX_RUBY] = {
        ['ctrl+e']   = { m_editing.ruby_exec },
        [SCE_RB_DEFAULT] = {
          ['ctrl+f'] = { m_snippets.insert, 'function ${1:name}' }
        }
      }
    }

    The top-level key commands are global, the SCLEX_RUBY command is global to
    a buffer with Ruby syntax highlighting enabled, and the SCE_RB_DEFAULT
    command is executed in that buffer only when currently in the default
    scope.

    Scopes and Lexers:
      SCLEX_RUBY and SCE_RB_DEFAULT are both constants having values defined in
      Scintilla.iface (22 and 0 respectively).

      Scope-insensitive key commands should be placed in the lexer table, and
      lexer-insensitive key commands should be placed in the keys table.

    By default scopes are enabled. To disable them, set the SCOPES_ENABLED
    variable to false.

    Order of execution precedence: Scope, Lexer, Global.
      Key commands in the current scope have the first priority, commands in
      the current lexer have the second, and global commands have the least
      priority.

    Declaring key commands: ['key_seq'] = { command [, arg] }
      ( e.g. ['ctrl+i'] = { modules.scite.snippets.insert } )
      key_seq is the key sequence string compiled from the CTRL, SHIFT, ALT,
      and ADD options (discussed below), command is the Lua function or SciTE
      menu command number (defined in SciTE.h), and arg is an optional
      argument. If I wanted to redefine the 'Open' menu command to be 'ctrl+r',
      then I would do something like ['ctrl+r'] = { 102 } -- open.
      Editor pane commands are kind of tricky at first. Their argument is the
      editor pane itself. You can see this in the original example above.
      The key character is ALWAYS lower case. There will be no such command as
      ['ctrl+I'].
      The string representation of characters is used, so ['ctrl+/'] is a valid
      key sequence. (See limitations of this below.)
      The order of CTRL, SHIFT, and ALT is important. (C, CS, CA, CSA, etc.)

    Chaining key commands:
      Key commands can be chained like in Emacs. All you have to do create
      nested tables as values of key commands.

      For Example:
      keys = {
        ['ctrl+x'] = {
          ['ctrl+s'] = { 106 } -- save
          ['ctrl+c'] = { 140 } -- quit
        }
      }

      Remember to define a clear_sequence key sequence in the keys table
      (Escape by default) in order to stop the current chain.
      If a show_completions key sequence is defined, a list of completions for
      the current chain will be displayed in the output pane.
      The current key sequence is contained in the SciTE variable KeyChain.
      (Appropriate for statusbar display)

    Additional syntax options:
      The text for CTRL, SHIFT, ALT, and ADD can be changed. ADD is the text
      inserted between modifiers ('+' in the example above). They can be as
      simple as c, s, a, [nothing] respectively. ( ['csao'] would be
      ctrl+shift+alt+o )

  Extensibility:
    You don't have to define all of your key commands in one place. I have
    Ruby-specific key commands in my ruby.lua file for example. All you need to
    do is add to the keys table. ( e.g. keys[SCLEX_RUBY] = { ... } )
    Note: additions to the keys table should be at the end of your *.lua file.
    (See the reason behind this below.)

  Limitations:
    Certain keys that have values higher than 255 can not be used, except for
      the keys that are located in the KEYSYMS table. When a key value higher
      than 255 is encountered, its string value is looked up in KEYSYMS and
      used in the sequence string.
    In order for key commands to execute Lua functions properly, the Lua
      functions must be defined BEFORE the key command references to it. This
      is why the keys.lua module should be loaded LAST, and key commands added
      at the bottom of *.lua scripts, after all global functions are defined.
    The clear_sequence and show_completions key sequences cannot be chained.

  Notes:
    Redefining any menu Alt+key sequences will override them. So for example if
      'alt+f' is defined, using Alt+F to access SciTE's File menu will no
      longer work.
    Setting ALTERNATIVE_KEYS to true enables my nano-emacs hybrid key layout.

  Questions? Comments? Suggestions? Additions?
    mitchell {att} caladbolg {dott} net