[VIM] .vimrc

source $VIMRUNTIME/mswin.vim
behave mswin

" In keeping with FGL standards, this vimrc favors tabs over spaces
" Alaestor's _vimrc file (2017 FGL)

"CUSTOM KEY MAPS
" Esc remove search highlighting
" < indent {} block to the left at cursor
" > indent {} block to the right at cursor
" <leader>[ folds file entirely, and opens one level.
" <leader>] expands all folds
" <leader><backspace> removes trailing whitespace
" <leader>= reindent file and remove trailing whitespace
" <leader><right> reddit conversion: add 4 spaces infront of everything
" <leader><left> reddit conversion: remove 4 spaces infront of every line
" F2 toggle error highlighting
" F3 toggle viewing whitespace characters
" F4 toggle line wrapping (by word)
" F5 identify syntax highlighting group at cursor

"TROLL REMAPS
" <leader>~ replace newlines with spaces, remove redundant whitespace
" <leader>` put a space before every newline


set nocompatible
syntax on
filetype plugin on
filetype indent on


"file finding (':find *.cpp' and ':b ' for buffers)
set path+=** "recursive
set wildmenu
set ignorecase
set smartcase


"folding
set mouse=a
set foldcolumn=1
set foldlevelstart=1 "start folded
set foldnestmax=10
set foldmethod=syntax "indent or manual or syntax


"editor layout
set visualbell t_vb=
au GuiEnter * set visualbell t_vb=
set laststatus=2
set number
set numberwidth=5
set lazyredraw
set ruler
set nowrap


"control
set backspace=indent,eol,start
set sc


"matching pairs
set matchpairs+=(:)
set matchpairs+={:}
set matchpairs+=<:>


"whitespace characters
set shiftwidth=4
set tabstop=4
    "indenting style... I love cindent!!!
    "issue: templates. +0 no indent for incomplete line. fixes, but not optimal.
set cindent
set cinoptions=h0,:0,=s,l1,cs,C1,(s,)50,*300,U1,Ws,m1,N-s,+0
    "disable automatic comment-insertion when you newline
autocmd FileType * setlocal formatoptions-=c formatoptions-=r formatoptions-=o
set listchars=tab:>-,trail:¬,extends:>,precedes:<,eol:»,nbsp:#,space:·
"set list to default on
    "keybind
nnoremap <F3> :set invlist<CR>


"highlighting
colorscheme FGL_custom
"   errors
set hlsearch
let s:ehl = 0
function! ToggleEH()
    if s:ehl == 0
        let s:ehl = 1
        let w:hlWidthLimit = matchadd("ErrorMsg",'\%>79v.\+',-1)
        let w:hlRedundant = matchadd("ErrorMsg",'\(\s\+$\| \+\ze\t\|\t\zs \+\)\(\%#\)\@!',-1)
        let w:hlDoubleSpace = matchadd("ErrorMsg",' \{2,}',-1)
    else
        let s:ehl = 0
        call matchdelete(w:hlWidthLimit)
        call matchdelete(w:hlRedundant)
        call matchdelete(w:hlDoubleSpace)
    endif
endfunction
call ToggleEH() " to default on
    "keybind
nnoremap <F2> :call ToggleEH()<CR>
" line wrapping (by word)
nnoremap <F4> :set wrap!<CR>:set lbr!<CR>
" identify syntax highlighting group at cursor
nnoremap <F5> :echo "hi<" . synIDattr(synID(line("."),col("."),1),"name") . '> trans<' . synIDattr(synID(line("."),col("."),0),"name") . "> lo<" . synIDattr(synIDtrans(synID(line("."),col("."),1)),"name") . ">"<CR>


"keymapping utility
    "unhighlight search terms
nnoremap <Esc> :noh<CR><Esc>
    "easily indent {} blocks from normal mode at cursor
nnoremap < <Esc>viB<
nnoremap > <Esc>viB>
    "fold and expand
nnoremap <leader>[ zMzr
nnoremap <leader>] zR
    "remove trailing whitespace
nmap <leader><Backspace> :%s/\s\+$//e<CR>:%s/\ \ /\ /e<CR>
    "reformat indent and remove trailing whitespace
nnoremap <leader>= mzgg=G:%s/\s\+$//e<CR>:%s/\ \ /\ /e<CR>:noh<CR><Esc>`z
    "reddit conversion: add 4 spaces infront of everything
nnoremap <leader><right> :%s/^/    /e<CR>
    "reddit conversion: remove 4 spaces infront of every line
nnoremap <leader><left> :%s/^    //e<CR>
    "trolly: replace newlines with spaces, remove redundant whitespace
nnoremap <leader>~ :%s/\n/\ /<CR>:%s/\s\+\s/\ /<CR>:noh<CR><Esc>
    "trolly: put a space before every newline
nnoremap <leader>` :%s/$/\ /e<CR>:noh<CR><Esc>


"loose file definitions
    "backup files
set backup "nobackup
set writebackup "nowritebackup
set backupdir=%TMP%//
    "swap file
set swapfile "noswapfile
set directory=%TMP%//
    "undo file
set undofile "noundofile
set undolevels=500 "1000
set undoreload=5000 "10000
set undodir=%TMP%//

"useful links
"https://youtu.be/XA2WjJbmmoM 'How to Do 90% of What Plugins Do'
"http://vim.wikia.com/wiki/Vim_Tips_Wiki
"http://vimdoc.sourceforge.net/htmldoc/indent.html#cinoptions-values
"http://vimdoc.sourceforge.net/htmldoc/indent.html#cinkeys-format