Class: Hide

Inherits:
Object show all
Defined in:
lib/xiki/hide.rb

Constant Summary collapse

@@visible = 
{}

Class Method Summary collapse

Class Method Details

.already_hidden ⇒ Object 



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# File 'lib/xiki/hide.rb', line 23

def self.already_hidden
  @@already_hidden
end

.char_from_user ⇒ Object 



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# File 'lib/xiki/hide.rb', line 85

def self.char_from_user
  c = $el.read_char_exclusive
  # Treat C-0 - C-9 the same as 0-9
  c -= 67108864 if(c >= 67108912 && c <= 67108921)
  "#{c.chr}"
end

.hide_by_indent(indent = nil) ⇒ Object 



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# File 'lib/xiki/hide.rb', line 205

def self.hide_by_indent indent=nil
  indent ||= Keys.prefix
  indent = -1 if indent == :u

  # If no prefix, use indent of current line
  if indent.nil?
    indent = Line.matches(/^ */).size
    # If currently indented to that level, go one deeper
    if $el.elvar.selective_display && indent == ($el.elvar.selective_display - 1)
      indent += 2
    end
  end

  $el.set_selective_display(indent + 1)
end

.hide_unless(search, options = {}) ⇒ Object

self.reset



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# File 'lib/xiki/hide.rb', line 13

def self.hide_unless search, options={}
  self.hide_unless_block(options) do |l, bol, eol|
    l =~ search
  end
end

.hide_unless_block(options = {}, &block) ⇒ Object 



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# File 'lib/xiki/hide.rb', line 27

def self.hide_unless_block options={}, &block

  #    elvar.line_move_ignore_invisible = true
  #     @@already_hidden = {}
  #     @@visible = []

  @@visible = []

  # Unless we can optimize by assuming hidden regions are ok
  unless options[:optimize]
    self.reset
    # Lisp funtion defined below
    l = $el.hide_find_overlays.to_a
    l.each { |i| @@already_hidden[i] = true }
  end

  t = $el.buffer_string
  lines = t.split "\n"
  bol = 1
  left = 1
  in_non_match = false

  if options[:include_first]   # Optionally skip top line
    l = lines.shift
    eol = bol + l.size + 1
    left = eol
    bol = eol
  end

  lines.each do |l|   # For each line
    eol = bol + l.size + 1
    #      if (l =~ search) && (! @@already_hidden[bol])
    if (yield(l, bol, eol)) && (! @@already_hidden[bol])
      @@visible << bol
      # If we're at the end of non-match area, hide
      if in_non_match
        @@areas_to_hide << [left, bol]
        in_non_match = false
      end
      left = eol
    else
      in_non_match = true
      @@already_hidden[bol] = true
    end
    bol = eol
  end

  @@areas_to_hide << [left, bol] if in_non_match

  # Construct and run lisp to hide it
  elisp = "(progn\n"
  @@areas_to_hide.each do |i|
    elisp += " (overlay-put (make-overlay #{i[0]} #{i[1]}) 'invisible 'hide)\n"
  end
  $el.el4r_lisp_eval elisp + ")"

end

.init ⇒ Object 



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# File 'lib/xiki/hide.rb', line 221

def self.init

  return if ! $el

  # Define lisp function to get list of displayed lines
  # In case something has been done to change them
  $el.el4r_lisp_eval %`
    (defun hide-find-overlays ()
      (save-excursion
        (beginning-of-buffer)
        (let (found (res ()))
          (while (not (eq (point) (point-max)))
            (setq found nil)
            ; Save if not hidden
            (dolist (o (overlays-at (point)))
              (if (overlay-get o 'invisible)
                (setq found t)
              )
            )
            (if found
              (push (point) res))
            (forward-line)
          )
          (reverse res)
        )
      )
    )
  `
end

.keys ⇒ Object 



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# File 'lib/xiki/hide.rb', line 166

def self.keys
end

.menu ⇒ Object 



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# File 'lib/xiki/hide.rb', line 5

def self.menu
  "
  | TODO: add docs about hiding.
  "
end

.reset ⇒ Object 



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# File 'lib/xiki/hide.rb', line 195

def self.reset
  @@areas_to_hide = []
  # Make this be stored per page, not globally
  @@already_hidden = {}
end

.reveal ⇒ Object

Reveals all hidden



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# File 'lib/xiki/hide.rb', line 252

def self.reveal
  $el.widen
  self.show
  self.hide_by_indent :u   # If hidden by indent
end

.search(search = nil, options = {}) ⇒ Object 



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# File 'lib/xiki/hide.rb', line 92

def self.search search=nil, options={}
  if search
    if search.class == String
      search = /#{Regexp.escape(search)}/i
    end
    self.hide_unless search, options
  else
    search = ""
  end

  $el.message "Hide.search for: #{search}"
  ch = self.char_from_user

  first_search = true

  while true
    break unless ch =~ /[-a-zA-Z ._=@\/\\#,;*<>-]/
    search += ch
    $el.message "hide-search for: #{search}"

    # If a tab, clear search and keep going
    if ch == ","
      search = ""
      ch = self.char_from_user
      next
    end

    self.hide_unless /#{Regexp.escape(search)}/i, options
    $el.recenter -3

    # Don't re-check visible regions from now on
    if first_search
      options.merge!(:optimize => true)
      first_search = false
    end

    # If only one left, go to it
    if @@visible.size == 1 && options[:expand_when_one]
      ch = "1"
      break
    end
    ch = self.char_from_user
  end

  ch = 1 if ch == "\t"   # If a tab, treat it like C-1

  # If num
  if 1 <= ch.to_i && ch.to_i <= 9
    if @@visible.size > 0
      if @@visible[ch.to_i - 1]
        $el.goto_char @@visible[ch.to_i - 1]
      else
        $el.goto_char @@visible[-1]
      end
    else
      $el.goto_line ch.to_i
    end
    #      next_line -1
    self.show
    $el.recenter 0
    # Run enter if option was passed
    if options[:press_enter]
      $el.command_execute "\C-m"
    end

  # Show all if they typed C-a
  elsif ch == "\001"
    self.show
  # Else, if control character, execute it and exit
  elsif "\C-a" <= ch && ch <= "\C-z"
    $el.command_execute ch unless ch == "\C-m"
  end
end

.show ⇒ Object

Shows things hidden by .hide



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# File 'lib/xiki/hide.rb', line 170

def self.show

  # Move down to visible line (this doesn't seem to happen on its own)
  while( @@already_hidden[$el.point] )
    $el.forward_line
  end

  #    @@already_hidden = {}
  # Delete hidden overlays
  $el.el4r_lisp_eval %`
    (dolist (over (overlays-in (point-min) (point-max) ))
      (when
        (overlay-get over 'invisible)
        (delete-overlay over)
      )
    )
  `
  self.reset
  @@visible = []
end

.visible ⇒ Object 



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# File 'lib/xiki/hide.rb', line 19

def self.visible
  @@visible
end