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Vim plugin: Create your own text objects
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README.md

vim-textobj-user - Create your own text objects

Build Status

vim-textobj-user is a Vim plugin to create your own text objects without pain. It is hard to create text objects, because there are many pitfalls to deal with. This plugin hides such details and provides a declarative way to define text objects. You can use regular expressions to define simple text objects, or use functions to define complex ones.

Examples

Simple text objects defined by a pattern

Define ad/id to select a date such as 2013-03-16, and define at/it to select a time such as 22:04:21:

call textobj#user#plugin('datetime', {
\   'date': {
\     'pattern': '\<\d\d\d\d-\d\d-\d\d\>',
\     'select': ['ad', 'id'],
\   },
\   'time': {
\     'pattern': '\<\d\d:\d\d:\d\d\>',
\     'select': ['at', 'it'],
\   },
\ })

Simple text objects surrounded by a pair of patterns

Define aA to select text from << to the matching >>, and define iA to select text inside << and >>:

call textobj#user#plugin('braces', {
\   'angle': {
\     'pattern': ['<<', '>>'],
\     'select-a': 'aA',
\     'select-i': 'iA',
\   },
\ })

Complex text objects defined by functions

Define al to select the current line, and define il to select the current line without indentation:

call textobj#user#plugin('line', {
\   '-': {
\     'select-a-function': 'CurrentLineA',
\     'select-a': 'al',
\     'select-i-function': 'CurrentLineI',
\     'select-i': 'il',
\   },
\ })

function! CurrentLineA()
  normal! 0
  let head_pos = getpos('.')
  normal! $
  let tail_pos = getpos('.')
  return ['v', head_pos, tail_pos]
endfunction

function! CurrentLineI()
  normal! ^
  let head_pos = getpos('.')
  normal! g_
  let tail_pos = getpos('.')
  let non_blank_char_exists_p = getline('.')[head_pos[2] - 1] !~# '\s'
  return
  \ non_blank_char_exists_p
  \ ? ['v', head_pos, tail_pos]
  \ : 0
endfunction

Text objects for a specific filetype

Define a( to select text from \left( to the matching \right), and define i( to select text inside \left( to the matching \right), but only for tex files:

call textobj#user#plugin('tex', {
\   'paren-math': {
\     'pattern': ['\\left(', '\\right)'],
\     'select-a': [],
\     'select-i': [],
\   },
\ })

augroup tex_textobjs
  autocmd!
  autocmd FileType tex call textobj#user#map('tex', {
  \   'paren-math': {
  \     'select-a': '<buffer> a(',
  \     'select-i': '<buffer> i(',
  \   },
  \ })
augroup END

Further reading

You can define your own text objects like the above examples. See also the reference manual for more details.

There are many text objects written with vim-textobj-user. If you want to find useful ones, or to know how they are implemented, see a list of text objects implemented with vim-textobj-user.

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