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" Copyright (c) 2016, 2020 Teddy Wing
"
" Twodo is free software: you can redistribute it and/or modify
" it under the terms of the GNU General Public License as published by
" the Free Software Foundation, either version 3 of the License, or
" (at your option) any later version.
"
" Twodo is distributed in the hope that it will be useful,
" but WITHOUT ANY WARRANTY; without even the implied warranty of
" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
" GNU General Public License for more details.
"
" You should have received a copy of the GNU General Public License
" along with Twodo. If not, see <http://www.gnu.org/licenses/>.

function! todo#MarkComplete()
	let view = winsaveview()

	keeppatterns s/\v^(\s*)[-_!xS] /\1v /

	call winrestview(view)

	silent! call repeat#set("\<Plug>TwodoMarkComplete", v:count)
endfunction


function! todo#MarkDeleted()
	let view = winsaveview()

	keeppatterns s/\v^(\s*)[-_!vS] /\1x /

	call winrestview(view)

	silent! call repeat#set("\<Plug>TwodoMarkDeleted", v:count)
endfunction


function! todo#MarkPartiallyCompleted()
	let view = winsaveview()

	keeppatterns s/\v^(\s*)[-_!xv] /\1S /

	call winrestview(view)

	silent! call repeat#set("\<Plug>TwodoMarkPartiallyCompleted", v:count)
endfunction


function! todo#RemoveOldTodos()
	let view = winsaveview()

	keeppatterns g/^\s*[vx] /d

	call winrestview(view)

	silent! call repeat#set("\<Plug>TwodoRemoveOldTodos", v:count)
endfunction


function! todo#Escalate()
	let todo = getline('.')

	" First non-whitespace character
	let col = match(todo, '\S')

	let priority = todo[col]

	if priority ==# '_'
		let todo = substitute(todo, '_', '-', '')
	elseif priority ==# '-'
		let todo = substitute(todo, '-', '!', '')
	endif

	call setline(line('.'), todo)

	silent! call repeat#set("\<Plug>TwodoEscalate", v:count)
endfunction


function! todo#Descalate()
	let todo = getline('.')

	" First non-whitespace character
	let col = match(todo, '\S')

	let priority = todo[col]

	if priority ==# '!'
		let todo = substitute(todo, '!', '-', '')
	elseif priority ==# '-'
		let todo = substitute(todo, '-', '_', '')
	endif

	call setline(line('.'), todo)

	silent! call repeat#set("\<Plug>TwodoDescalate", v:count)
endfunction