Recently, NERDTree added the &readonly setting to its buffer.
Unfortunately, this caused airline to render the '[noperm]' string in
it.
Fix this by only making the readonly check for buffers that actually
represent files (e.g. the buftype option is empty).
Instead of requiring each version control plugin to modify airline to
show the current branch, provide a customization function we can check
instead.
Following the example of airline_theme_patch_func, you define the
variable like so:
let g:airline#extensions#branch#custom_head = 'david#svn#get_branch'
Custom functions should cache their value. They may need an autocmd to
invalidate their cache:
" Use a buffer-unique group name to prevent clearing autocmds for other
" buffers.
exec 'augroup svndavid-'. bufnr("%")
au!
autocmd BufWinLeave <buffer> unlet! b:svndavid_branch
augroup END
This change lets me integrate with vc.vim (I couldn't get VCSCommand
working for svn) or write my own thing for perforce.
Additionally, always load whole file and check for existence.
Instead of determining up front whether various scm plugins are
installed, check for them on use so they can be added after this script
is sourced.
This also mitigates the problem of checking for existence of autoload
functions (which are not loaded by exist()). Since we're checking
root-level functions, they're likely to be loaded once we're using any
part of the plugin.
275ec4fe63 broke this so that numbering
started from 0 instead of 1 with
g:airline#extensions#tabline#buffer_idx_mode = 1
Specifically, I overlooked that |index| actually tracked the index of
the current buffer in the buffer list *starting from 1*, whereas I
assumed it tracked the true index (starting from 0).
airline#extensions#tabline#buflist#list doesn't pick up some buffers
(most notably Netrw buffers), so there are sometimes no buffers to show
and the tabline code fails with an error. This avoids that situation.
It would be better to detect these and show titles for them, but for now
this restores the old behaviour.
