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bracematching.lua

Highlight and match braces before and after a brace. Modified from Textadept's editing.lua. Textadept's default is to only match the brace to the right which can be preferable if a block caret is used.

 
local M = {}

Setup

 





  

    
  

  

Disable default highlighting of matching braces.





  
textadept.editing.HIGHLIGHT_BRACES = false






  

    
  

  

Table with char codes as indices.





  
braces = { -- () [] {}
  [40] = 1, [91] = 1, [123] = 1,
  [41] = 1, [93] = 1, [125] = 1,
}






  

    
  

  

Commands





  





  

    
  

  

Highlights matching braces, before and after a brace.
Between two braces preference is to the left.





  
events.connect('update_ui', function()
  local buffer = buffer
  local pos = buffer.current_pos
  if braces[buffer.char_at[pos - 1]] then pos = pos - 1 end
  if braces[buffer.char_at[pos]] then
    local match_pos = buffer:brace_match(pos)
    if match_pos ~= -1 then
      buffer:brace_highlight(pos, match_pos)
    else
      buffer:brace_bad_light(pos)
    end
  else
    buffer:brace_bad_light(-1)
  end
end)






  

    
  

  

Goes to a matching brace position, selecting the text inside if specified.

Parameter:

select: If true, selects the text between matching braces.





  
function M.match_brace(select)
  local buffer = buffer
  local caret = buffer.current_pos
  if braces[buffer.char_at[caret - 1]] then
    caret = caret - 1
  end
  local match_pos = buffer:brace_match(caret)
  if match_pos ~= -1 then
    if select then
      if match_pos > caret then
        buffer:set_sel(caret, match_pos + 1)
      else
        buffer:set_sel(caret + 1, match_pos)
      end
    else
      buffer:goto_pos(match_pos)
    end
  end
end

return M