vim-markup/text.vim

" Copyright 2024 Henrique Paone
"
" This file is part of Vim-Markup.
"
" Vim-Markup 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.
" 
" Vim-Markup 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
" Vim-Markup. If not, see <https://www.gnu.org/licenses/>.

"------------------------------------------------------------------------------
" Configuration
"------------------------------------------------------------------------------

" Folding
set foldmethod=indent

" Uses spaces instead of tabs
set expandtab tabstop=2 shiftwidth=2

" No autoclosing on '
inoremap ' '

" Formating options
set fo+=t " Automatic formatting of text
set fo+=n " Recognize numbered lists

"-----------------------------------------------------------------------------
" Toggle automatic formatting
set fo-=a
nnoremap <leader>f :call ToggleAutoFormat()<cr>

fu! ToggleAutoFormat()
	if stridx(&fo, 'a') == -1
		set fo+=a
	else
		set fo-=a
	endif
endf
"-----------------------------------------------------------------------------

" Make formatting work properly with bullet icon
let &formatlistpat='^\s*\(\d\+[\]:.)}\t ]\|[•][\t ]\)\s*'

"------------------------------------------------------------------------------
"Special characters
"------------------------------------------------------------------------------

inoremap \Ep Σ
inoremap \ep ε
inoremap \Ee ∈ 
inoremap \ee ϵ
inoremap \delta ∆

inoremap \fore ⸫
inoremap \-> →
inoremap \/> ↙
inoremap \\> ↘
inoremap \|> ↓
inoremap \=> ⇒

inoremap \. •<Space>
inoremap \par ¶
inoremap \sec §

inoremap \_1 ₁
inoremap \_2 ₂

inoremap \^1 ¹

"------------------------------------------------------------------------------
" Syntax for text files
"------------------------------------------------------------------------------

syn match myTodo /^.*TODO:.*/
hi myTodo cterm=bold ctermbg=red ctermfg=white

"------------------------------------------------------------------------------
" Poor man's markup
"------------------------------------------------------------------------------

" Only show hidden markup in insert mode
setlocal conceallevel=2
setlocal concealcursor=nvc

" Bold
syn region boldText matchgroup=boldDelim start=/\*/ end=/\*/ concealends
hi boldText cterm=bold
syn match escapedAsterisk /\\\*/ conceal cchar=*

" Italic
syn region italicText matchgroup=italicDelim start=/\// end=/\// concealends
hi italicText cterm=italic
syn match escapedItalic /\\\// conceal cchar=/

" Underline
syn region underlineText matchgroup=underlineDelim start=/_/ end=/_/ concealends
hi underlineText cterm=underline
syn match underlineText /\\_/ conceal cchar=_

" Autoclosing markup symbols
inoremap * **<left>
inoremap / //<left>
inoremap _ __<left>

" Toggle showing concealed markup 
let g:conceal_on=1
nnoremap <leader>m :call ToggleConceal()<cr>
fu! ToggleConceal()
	if g:conceal_on
		set conceallevel=0
		let g:conceal_on=0
	else
		set conceallevel=2
		let g:conceal_on=1
	endif
endf

" Horizontal lines
inoremap \hl <esc>:call FillLine('─')<cr>i
inoremap \dl <esc>:call FillLine('-')<cr>i

" Fills text width with passed char
fu! FillLine(char)
	for i in range(0, &textwidth - 1)
		execute 'norm!i' .. a:char
	endfor
endf