init.lua

----[[ Helpers ]]----
vim.cmd 'packadd paq-nvim'
local lsp = require 'lspconfig'
local paq = require 'paq-nvim'.paq
local scopes = {o = vim.o, b = vim.bo, w = vim.wo}

local function map(mode, lhs, rhs, opts)
    local options = {noremap = true, silent = true}
    if opts then options = vim.tbl_extend('force', options, opts) end
    vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end
local function opt(scope, key, value)
    scopes[scope][key] = value
    if scope ~= 'o' then scopes['o'][key] = value end
end

local t = function(str)
    return vim.api.nvim_replace_termcodes(str, true, true, true)
end
local check_back_space = function()
    local col = vim.fn.col('.') - 1
    if col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') then
        return true
    else
        return false
    end
end

_G.tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t "<C-n>"
    elseif check_back_space() then
        return t "<Tab>"
    else
        return vim.fn['compe#complete']()
    end
end
_G.s_tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t "<C-p>"
    else
        return t "<S-Tab>"
    end
end

-- General Settings
vim.g.mapleader = ','
local indent = 4
-- vim.cmd([[colorscheme gruvbox]])                     -- Set colorscheme
-- opt('b', 'expandtab', true)                          -- Use spaces instead of tabs
opt('b', 'shiftwidth', indent)                       -- Size of an indent
opt('b', 'smartindent', true)                        -- Smart indent
opt('b', 'autoindent', true)                         -- Auto indent
opt('b', 'tabstop', indent)                          -- No. of spaces for tabs
opt('o', 'completeopt', 'menuone,noinsert,noselect') -- Completion options
opt('o', 'showtabline', 2)                           --
opt('o', 'tabline', '%m %t')                         --
opt('o', 'encoding', 'utf-8')                        --
opt('o', 'fileencoding', 'utf-8')                    --
opt('o', 'hidden', true)                             -- Enable modified buffers in BG
opt('o', 'ignorecase', true)                         -- Ignore case
opt('o', 'joinspaces', false)                        -- No double spaces with join after a '.','?','!'
opt('o', 'scrolloff', 4)                             -- Lines of context
opt('o', 'sidescrolloff', 8)                         -- Columns of context
opt('o', 'shiftround', true)                         -- Round indent
opt('o', 'smartcase', true)                          -- Don't ignore case with capitals
opt('o', 'splitbelow', true)                         -- new window below current
opt('o', 'splitright', true)                         -- new window right current
opt('o', 'termguicolors', true)                      -- True color support
opt('o', 'wildmode', 'list:longest')                 -- Command-line completion mode
opt('o', 'autochdir', true)                          -- Vim's working dir will be the same as your working dir
opt('o', 'clipboard', 'unnamedplus')                 -- Use systems clipboard
opt('o', 'background', 'dark')                       -- Set background dark
opt('w', 'list', true)                               -- Show invisible characters (tabs ...)
opt('w', 'number', true)                             -- Print line number
opt('w', 'relativenumber', true)                     -- Relative line number
opt('w', 'wrap', false)                              -- Disable line wrap
opt('w', 'signcolumn', 'yes:2')                      --

-- Plugins
paq {'savq/paq-nvim', opt=true}
paq {'neovim/nvim-lspconfig'}
paq {'hrsh7th/vim-vsnip'}
paq {'hrsh7th/nvim-compe'}
paq {'morhetz/gruvbox'}
paq {'jiangmiao/auto-pairs'}
paq {'chrisbra/unicode.vim'}
paq {'folke/which-key.nvim'}
paq {'vim-airline/vim-airline'}

require("which-key").setup {}
-- Mappings
map('n', '<Space>',   '<NOP>')                       -- Unmap space key
map('n', '<Leader>h', ':noh<CR>')                    -- Clear search highlights
map('n', '<Leader>e', ':NvimTreeToggle<CR>')         -- NvimTreeToggle
-- Tab Completion
map('i', '<Tab>',   'v:lua.tab_complete()',   {expr = true})
map('s', '<Tab>',   'v:lua.tab_complete()',   {expr = true})
map('i', '<S-Tab>', 'v:lua.s_tab_complete()', {expr = true})
map('s', '<S-Tab>', 'v:lua.s_tab_complete()', {expr = true})
-- for better Movement between Windows
map('n', '<C-h>', '<C-w>h')
map('n', '<C-l>', '<C-w>l')
map('n', '<C-j>', '<C-w>j')
map('n', '<C-k>', '<C-w>k')
-- for better Movement between Buffers
map('n', '<Tab>',   ':bnext<CR>')
map('n', '<S-Tab>', ':bprevious<CR>')
-- Resize Windows
map('n', '<M-j>', ':res -2<CR>')
map('n', '<M-k>', ':res +2<CR>')
map('n', '<M-h>', ':vertical res +2<CR>')
map('n', '<M-l>', ':vertical res -2<CR>')
-- Compe
map('i', '<C-Space>', 'compe#complete()',        {expr = true})
map('i', '<CR>',      'compe#confirm(\'<CR>\')', {expr = true})
map('i', '<C-e>',     'compe#close(\'<C-e>\')',  {expr = true})

-- LSP
local on_attach = function(client, bufnr)
    local function buf_map(mode, lhs, rhs, opts)
        local options = {noremap = true, silent = true}
        if opts then options = vim.tbl_extend('force', options, opts) end
        vim.api.nvim_buf_set_keymap(bufnr, mode, lhs, rhs, options)
    end
    buf_map('n', 'gd',         ':lua vim.lsp.buf.declaration()<CR>')
    buf_map('n', 'gi',         ':lua vim.lsp.buf.implementation()<CR>')  -- Go to implementation
    buf_map('n', 'gr',         ':lua vim.lsp.buf.references()<CR>')      -- Go to references
    buf_map('n', '[d',         ':lua vim.lsp.diagnostic.goto_prev()<CR>') -- Go to
    buf_map('n', ']d',         ':lua vim.lsp.diagnostic.goto_next()<CR>') -- Go to
    buf_map('n', '<Leader>er',  ':lua vim.lsp.diagnostic.show_line_diagnostics()<CR>')
    buf_map('n', '<Leader>q',  ':lua vim.lsp.diagnostic.set_loclist()<CR>')
    buf_map('n', '<Leader>k',  ':lua vim.lsp.buf.hover()<CR>')
    buf_map('n', '<C-k>',      ':lua vim.lsp.buf.signature_help()<CR>')
    buf_map('n', '<Leader>rn', ':lua vim.lsp.buf.rename()<CR>')
    buf_map('n', '<Leader>ca', ':lua vim.lsp.buf.code_action()<CR>')
    -- Formatting
    if client.resolved_capabilities.document_formatting then
        buf_map('n', '<Leader>f', ':lua vim.lsp.buf.formatting()<CR>')
    end
    if client.resolved_capabilities.document_range_formatting then
        buf_map('v', '<Leader>f', ':lua vim.lsp.buf.range_formatting()<CR>')
    end
    -- autocmds highlighting
    if client.resolved_capabilities.document_highlight then
        vim.api.nvim_exec([[
        hi LspReferenceRead cterm=bold ctermbg=red guibg=LightYellow
        hi LspReferenceText cterm=bold ctermbg=red guibg=LightYellow
        hi LspReferenceWrite cterm=bold ctermbg=red guibg=LightYellow
        augroup lsp_doc_highlight
        autocmd! * <buffer>
        autocmd CursorHold <buffer> lua vim.lsp.buf.document_highlight()
        autocmd CursorMoved <buffer> lua vim.lsp.buf.clear_references()
        augroup END
        ]], false)
    end
end

--- LSP-config
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.completion.completionItem.snippetSupport = true
capabilities.textDocument.completion.completionItem.resolveSupport = {
    properties = {
        'documentation',
        'detail',
        'additionalTextEdits',
    }
}

local servers = { "cmake", "pyls", "html", "cssls", "rust_analyzer" }
for _, ls in ipairs(servers) do
    lsp[ls].setup {
        on_attach = on_attach,
        capabilities = capabilities,
    }
end

-- C, C++
lsp.clangd.setup {
    on_attach = on_attach,
    capabilities = capabilities,
    cmd ={
        "clangd"
        ,"--background-index"
        ,"--pch-storage=memory"
        ,"--suggest-missing-includes"
        ,"--clang-tidy"
        ,"--all-scopes-completion"
        ,"--completion-style=detailed"
        ,"--header-insertion=iwyu"
    },
}

--Compe-config
require'compe'.setup {
    autocomplete  = true;
    debug = false;
    documentation = true;
    enabled    = true;
    incomplete_delay = 400;
    max_abbr_width = 100;
    max_kind_width = 100;
    max_menu_width = 100;
    min_length = 1;
    preselect  = 'enable';
    source_timeout = 200;
    throttle_time = 80;
    source = {
        buffer = true;
        calc = true;
        nvim_lsp = true;
        nvim_lua = true;
        path = true;
        spell  = true;
        tags = true;
        vsnip  = true;
    };
}