config: nvim: rewrite config in lua and use packer as plugin manager

config/nvim/lua/general.lua

@@ -0,0 +1,74 @@
+-- reduce boilerplate by defining some shortcuts
+local opt = vim.opt
+local cmd = vim.cmd
+local autocmd = vim.api.nvim_create_autocmd
+
+--------------------
+-- General
+--------------------
+opt.mouse = 'n'               -- enable mouse support in normal mode
+opt.clipboard = 'unnamedplus' -- copy/paste to and from system clipboard
+
+opt.wildmode = 'list:longest,full'
+opt.wildignorecase = true
+opt.wildignore = '*.o,*.d,*.so,*.class,*.aux,*.log,*.out,*.toc,*.pdf,*.pyc'
+
+opt.fileformats = 'unix,dos'  -- use identical lineendings for all platforms
+opt.secure = true             -- disable autocmd for security reasons
+
+--------------------
+-- Tabs
+--------------------
+opt.tabstop = 4               -- 1 tab == N spaces
+opt.shiftwidth = 4            -- shift N spaces when pressing tab
+opt.smartindent = true        -- take syntax into account for applying indentation
+
+--------------------
+-- Search
+--------------------
+opt.ignorecase = true         -- ignore capitalization on search
+opt.smartcase = true          -- ignore capitalication unless word contains a capital
+
+opt.iskeyword:append '-'      -- treat hyphenated words as a single word
+
+--------------------
+-- Neovim UI
+--------------------
+opt.number = true             -- line numbers
+opt.ruler = true              -- cursor position in statusbar
+opt.showtabline = 2           -- always show vim tabs
+opt.showcmd = true            -- display currently typed command
+opt.termguicolors = true      -- enable 24-bit RGB color
+
+-- highlight line at which the cursor is positioned
+opt.cursorline = true
+cmd 'highlight CursorLine term=bold cterm=bold'
+cmd 'highlight CursorLineNR term=bold cterm=bold ctermbg=darkgrey'
+
+-- display warning column at 81 and 121
+opt.colorcolumn = '81,121'
+cmd 'highlight ColorColumn ctermbg=235 guibg=#2d2d2d'
+
+opt.splitright = true         -- horizontal split to the right
+opt.splitbelow = true         -- vertical split to the bottom
+
+-- define characters to display when using 'set list'
+opt.listchars = 'tab:→ ,trail:∙,eol:¬,extends:❯,precedes:❮,nbsp:␣'
+
+--------------------
+-- Performance
+--------------------
+opt.hidden = true             -- allow buffers with changes to be hidden
+opt.updatetime = 300          -- delay (in ms) to wait before triggering event
+opt.timeoutlen = 500          -- time (in ms) to wait for event to complete
+opt.history = 10000           -- remember N lines of history
+
+--------------------
+-- Misc
+--------------------
+
+-- remove redundant whitespaces on save
+autocmd('BufWritePre', {
+	pattern = '*',
+	command = ':%s/\\s\\+$//e'
+})