Expose mechanism for generating mappings...

[jszakmeister]

textobj#user#plugin() takes an obj_spec parameter describing how to wire up the mappings. It'd be nice to expose that machinery. For instance, I've been looking at vim-textobj-diff. While I like most of what it does, I'd like to map things a little differently (use [[, ]], [], ][ to navigate hunks and have the mappings be buffer specific, and they'll be setup at filetype detect time). Unfortunately, it turns out to be quite a bit of work redoing what plugin() is already helping with. It'd be nice to avoid that, and make it so that I can do something like:

call textobj#user#mapping('diff', {
\      'file': {
\        'move-N': '<Leader>dfJ',
\        'move-P': '<Leader>dfK',
\        'move-n': '<Leader>dfj',
\        'move-p': '<Leader>dfk',
\        'select': ['adH', 'adf', 'idH', 'idf'],
\      },
\      'hunk': {
\        'move-n': ']]',
\        'move-N': '][',
\        'move-p': '[[',
\        'move-P': '[]',
\        'select': ['adh', 'idh'],
\      },
\    })