vimrc

" File favorites
" Handy command: let @"=expand("%:p")
" In normal mode: %p ; just remember to screen spaces
cnoreabbrev _prj tab drop C:\path\to\file\ with\ spaces.txt

" Configuration
set nocp " No compatibility

set enc=utf-8
set guifont=Consolas:h11
set fillchars+=vert:│ " u2502 vertical line separator
set linespace=0

let $LANG = 'en_gb'

set langmenu=en_gb

" Unneeded keys
nnoremap <F1> <nop>
nnoremap Q <nop>
nnoremap K <nop>

" colorscheme codeschool
" let g:colors_name = 'codeschool'
set background=light
colorscheme bandit

" history
set history=100
set undolevels=1000

" Exclamations
set noerrorbells
set visualbell
set t_vb= " Visual bell switches from audible bell to visual bell. Here in fact visual bell is disabled.

" Syntax
syntax on

set modeline
set modelines=2

set nolist " Because it affects text wrap by words
set listchars=eol:$,tab:»\ ,trail:. " Make these markers visible - by differen colors

set wrapmargin=0 " (When textwidth!=0) Do not wrap basing on window size

set textwidth=0 " Do not hard-wrap basing on certain width

set wrap " Dynamic word wrap
set linebreak " Do not brak words
"set showbreak=…  " What to show in the beginning of broken line
set showbreak=└\  " What to show in the beginning of broken line

set tabstop=4 " Good for texts, not for programming
set shiftwidth=4 " When using >>, << ; shall match with tabstop
set softtabstop=0 " For insert mode
set noexpandtab " Do not convert tabs to spaces

set backspace=indent,eol,start " Make backspace go to prev. line if en the ^
set autoindent " Make indent same as previous line

set splitbelow " Good for preview window: to make it below

" Open file under cursor
set isfname+=32 " When open files with gf, consider space as part of filename
nnoremap gf :tab drop <cfile><CR> " Open new file only if it is not open in other tab; otherwise switch to that tab

" Reset autocommands
au! InsertLeave *
au! FocusLost *
au! FocusGained *
au! InsertEnter *
au! InsertLeave *

" Line numbers
set number " show line numbers
set norelativenumber " Relative numbers affect performance for long files with long lines an syntax highlight
"au FocusLost * :set norelativenumber
"au FocusGained * :set relativenumber
"au InsertEnter * :set norelativenumber
"au InsertLeave * :set relativenumber

" Performance affecting
" relativenumber
" cursorli
" cursorcolumn
set nolazyredraw " Default. Makes more smooth. If performace affected, set this to yes; the result - lower FPS, but higher speed.

" folding
set foldcolumn=1

" If using gvim, let use Alt combinations (disable invoking menu with Alt keys)
set winaltkeys=no

" Working with buffers, tabs, windows
set showtabline=2 " Always, even if there is only one tab
set hidden " When editing a new or unsaved file, premit switching to another buffer (else will say that "Not saved")

" Handy keybindings
nmap <A-Left> :tabprev<CR>
nmap <A-Right> :tabnext<CR>
nmap <A-Up> :bprev<CR>
nmap <A-Down> :bnext<CR>

" After using :vimgrep or :make - switch results:
map <C-j> :cn<CR>
map <C-k> :cp<CR>


" plugin: foldsearch
" toggle search folding with z/
nmap z/ :if (exists("w:foldsearch_viewfile")) \| :execute ":Fe" \| else \| :execute ":Fs" \| endif<CR>

" plugin: vm-session
" Note: exceptionse like MiniBufExplorer add to function s:state_filter(line)
let g:session_autosave_periodic=3 " Auto-save session every 3 minutes
let g:session_autosave='yes' " Do not prompt if I want to save autosession
let g:session_persist_colors = 0 " Do not save colors

" plugin: netrw (embedded) - invoked by :E command
let g:netrw_browse_split=0 " Open file in the same window

" plugin: hashnotes
nmap <F3> :call HashNotesAssignIndex()<CR>

" plugin: MiniBufExplorer
nmap <F4> :MBEToggle<CR>
let g:miniBufExplVSplit=33 " Exactly filename of new file
let g:miniBufExplUseSingleClick=1 " Single mouse click opens the file

" plugin: diffchar
" Improves diff: make by char/word etc
" Warning 1: makes it slow
" Warning 2: re-binds some keys. Prevent it.
let g:DiffUnit="Word1"


" ============ When exiting Insert mode, do not move cursor back
" Aternative: http://compsci.ca/v3/viewtopic.php?t=34055
function! s:CorrectPosition()
	if !exists("b:tmpNormalMode")
		let l:newCol = getpos('.')[2]
		if ( l:newCol != 1 )
			let l:newCol+=1
		endif
		call cursor(getpos('.')[1], l:newCol)
	else
		unlet b:tmpNormalMode
	endif
endfunction
au! InsertLeave * call <SID>CorrectPosition()
inoremap <buffer> <silent> <C-o> <Esc>:let b:tmpNormalMode=1<CR>gi<C-o>

" au InsertLeave * exec "let newCol = getpos('.')[2] | if ( newCol != 1 ) | let newCol+=1 | endif | call cursor(getpos('.')[1], newCol)"
" inoremap <buffer> <silent> <Esc> <C-o>:stopinsert<CR> " Makes modeline does not update! A bug

" ========== Make up/down movement by visible line, not by physical line:
" Note: using imap to apply cursor position correction
imap <buffer> <silent> <Up>   <C-o>gk
imap <buffer> <silent> <Down> <C-o>gj
imap <buffer> <silent> <Home> <C-o>g<Home>
imap <buffer> <silent> <End>  <C-o>g<End>

" ========== Search
" TODO: find n-th occurence of match; 5th occurence of 'e': \(\(e\).\{-}\)\{4\}\zs\2 ; use buttons to increase, decrease, return to original
" Search as you type
set incsearch
" Higlight all search results
" Actually it is on. Functions will be responsible for setting this variable
set nohlsearch

" Remove search highlight on cursor move
function! s:HlSearchOff()
	if ( exists ("b:last_search") && b:last_search==@/ )
		" need to clear
		if ( exists("b:search_cleared") && b:search_cleared==1 )
			" Do nothing
		else
			" nohlsearch " Does not work in autocmd and functions - see help
			" redraw
			set nohlsearch
			let b:search_cleared=1
		endif
	else
		let b:search_cleared=0
		set hlsearch
	endif

	let b:last_search=@/
endfunction

function! s:HlSearchOn()
	let b:search_cleared=0
	set hlsearch
endfunction

autocmd! CursorMoved * call <SID>HlSearchOff()

nnoremap <silent> n n:call <SID>HlSearchOn()<CR>
nnoremap <silent> N N:call <SID>HlSearchOn()<CR>

" Note: re-definition of /, ? etc currupts sequeces like d/x (delete till 'x')
" Bug: /<CR> and ?<CR> (not chnging the pattern will not highlight search results. Search results will be highlighted only if new pattern differs from previous.

" ========== Scroll
set scrolloff=1 " Always show these amount of lines above and below cursor

" Keep cursor on-screen position when PgUp, PgDown

function! s:ScrollSave()
	" Affects cursor position
	let l:view=winsaveview()
	normal! H
	let l:view['Hline']=line('.')
	normal! L
	let l:view['Lline']=line('.')
	return l:view
endfunction
function! s:ScrollCorrect(view)
	" Works ok unless passing end of file
	normal! H
	let l:view=<SID>ScrollSave()

	let l:view['curswant']=a:view['curswant']

	let l:down=a:view['lnum']-a:view['Hline']
	if ( l:view['Hline']+l:down > l:view['Lline'] )
		let l:down=l:view['Lline']-l:view['Hline']
	endif

	call winrestview(l:view)

	if (l:down>0)
		exec "normal! " . l:down . "j"
	else
		normal! jk " To apply curswant.
	endif
endfunction

nnoremap <silent> <PageUp> :<C-u>let w:scroll_view=<SID>ScrollSave() \| exec "normal! <C-v><C-b>" \| call <SID>ScrollCorrect(w:scroll_view)<CR>
nnoremap <silent> <C-b> :<C-u>let w:scroll_view=<SID>ScrollSave() \| exec "normal! <C-v><C-b>" \| call <SID>ScrollCorrect(w:scroll_view)<CR>
nnoremap <silent> <PageDown> :<C-u>let w:scroll_view=<SID>ScrollSave() \| exec "normal! <C-v><C-f>" \| call <SID>ScrollCorrect(w:scroll_view)<CR>
nnoremap <silent> <C-f> :<C-u>let w:scroll_view=<SID>ScrollSave() \| exec "normal! <C-v><C-f>" \| call <SID>ScrollCorrect(w:scroll_view)<CR>

" ========== For programming
" autocmd FileType cpp :set makeprg=g++\ -std=c++14\ -ggdb\ -o\ %:r\ %
" autocmd FileType c :set makeprg=gcc\ -ggdb\ -o\ %:r\ %
" nnoremap <F4> :write<CR>:make<CR>
" nnoremap <F5> :!./%:r 2>%:r.log<CR>
"
" " Reengineering tool involving foldsearch. Rename word (function name, variable etc)
" nmap <F2> :let winview=winsaveview()<CR>yiw*N:Fs<CR>:call winrestview(winview)<CR>
"
" " Better folding
" " Set a nicer foldtext function
" set foldtext=MyFoldText()
" function! MyFoldText()
"   let line = getline(v:foldstart)
"   if match( line, '^[ \t]*\(\/\*\|\/\/\)[*/\\]*[ \t]*$' ) == 0
"     let initial = substitute( line, '^\([ \t]\)*\(\/\*\|\/\/\)\(.*\)', '\1\2', '' )
"     let linenum = v:foldstart + 1
"     while linenum < v:foldend
"       let line = getline( linenum )
"       let comment_content = substitute( line, '^\([ \t\/\*]*\)\(.*\)$', '\2', 'g' )
"       if comment_content != ''
"         break
"       endif
"       let linenum = linenum + 1
"     endwhile
"     let sub = initial . ' ' . comment_content
"   else
"     let sub = line
"     let startbrace = substitute( line, '^.*{[ \t]*$', '{', 'g')
"     if startbrace == '{'
"       let line = getline(v:foldend)
"       let endbrace = substitute( line, '^[ \t]*}\(.*\)$', '}', 'g')
"       if endbrace == '}'
"         let sub = sub.substitute( line, '^[ \t]*}\(.*\)$', '...}\1', 'g')
"       endif
"     endif
"   endif
"   let n = v:foldend - v:foldstart + 1
"   let info = " " . n . " lines"
"   let sub = sub . "                                                                                                                  "
"   let num_w = getwinvar( 0, '&number' ) * getwinvar( 0, '&numberwidth' )
"   let fold_w = getwinvar( 0, '&foldcolumn' )
"   let sub = strpart( sub, 0, winwidth(0) - strlen( info ) - num_w - fold_w - 1 )
"   return sub . info
" endfunction