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function! PushTagStackOnCommand(command_name) abort
call s:PushTagStackBefore()
exec a:command_name
call s:PushTagStackAfter()
endfunction
function! PushTagStackOnFunction(function_name) abort
call s:PushTagStackBefore()
call a:function_name()
call s:PushTagStackAfter()
endfunction
function! s:PushTagStackBefore() abort
let dotag = &tagstack && exists('*gettagstack') && exists('*settagstack')
if dotag
let from = [bufnr('%'), line('.'), col('.'), 0]
let tagname = expand('<cword>')
let stack = gettagstack()
if stack.curidx > 1
let stack.items = stack.items[0:stack.curidx-2]
else
let stack.items = []
endif
let stack.items += [{'from': from, 'tagname': tagname}]
let stack.curidx = len(stack.items)
call settagstack(win_getid(), stack)
endif
endfunction
function! s:PushTagStackAfter() abort
let dotag = &tagstack && exists('*gettagstack') && exists('*settagstack')
if dotag
let curidx = gettagstack().curidx + 1
call settagstack(win_getid(), {'curidx': curidx})
endif
endfunction
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