-- Bootstrap lazy.nvim
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not (vim.uv or vim.loop).fs_stat(lazypath) then
  local lazyrepo = "https://github.com/folke/lazy.nvim.git"
  local out = vim.fn.system({ "git", "clone", "--filter=blob:none", "--branch=stable", lazyrepo, lazypath })
  if vim.v.shell_error ~= 0 then
    vim.api.nvim_echo({
      { "Failed to clone lazy.nvim:\n", "ErrorMsg" },
      { out,                            "WarningMsg" },
      { "\nPress any key to exit..." },
    }, true, {})
    vim.fn.getchar()
    os.exit(1)
  end
end
vim.opt.rtp:prepend(lazypath)

-- Make sure to setup `mapleader` and `maplocalleader` before
-- loading setting manual mappings or loading lazy.nvim
vim.g.mapleader = " "
vim.g.maplocalleader = "\\"

-- no highlights after search
vim.opt.hlsearch = false
vim.opt.ignorecase = true -- ignore casing in searches...
vim.opt.smartcase = true  -- ...unless I provide both caps and lowercase

-- allow arrow keys and h/l to move to the next/prev line when at the edge
vim.opt.whichwrap:append("<,>,h,l")

-- display non-printing character
vim.opt.listchars = 'tab:┆-,trail:~,extends:>,precedes:<,nbsp:•'
vim.opt.list = true

-- highlight line with cursor
vim.opt.cursorline = true

-- spaces, not tab
vim.opt.expandtab = true
vim.opt.tabstop = 2
vim.opt.shiftwidth = 2
vim.opt.softtabstop = 2

-- all my code is in git anyways, and these files are cluttery
vim.opt.backup = false
vim.opt.writebackup = false
vim.opt.swapfile = false

-- new splits open to the right or below the current window
vim.opt.splitbelow = true
vim.opt.splitright = true

function tblmerge(x, y)
  for k, v in pairs(y) do x[k] = v end
  return x
end

local function map(mode, lhs, rhs, opts)
  vim.api.nvim_set_keymap(mode, lhs, rhs,
    tblmerge({ noremap = true, silent = true }, opts or {}))
end
function nmap(l, r, opt) map('n', l, r, opt) end

function imap(l, r, opt) map('i', l, r, opt) end

function vmap(l, r, opt) map('v', l, r, opt) end

-- Treat long lines as broken lines so you can move in them
nmap('j', 'gj')
nmap('k', 'gk')

-- maintain visual selection when changing indentation
vmap('<', '<gv')
vmap('>', '>gv')

-- handy save
nmap("<Leader>w", ":w<CR>")

-- handy escape
imap('jk', '<Esc>')

-- tab handling
nmap("<Leader>tn", ":tabnew<CR>")
nmap('<Tab>', '<C-W>w')
nmap('<S-Tab>', '<C-W>W')
nmap('<Leader>te', ':tabedit <c-r>=expand("%:p:h")<cr>/<cr>')

-- Kill trailing whitespace
function Whitespace()
  local save = vim.fn.winsaveview()
  vim.cmd [[keeppatterns %s/\s\+$//e]]
  vim.cmd [[keeppatterns %s/\r$//e]]
  vim.fn.winrestview(save)
end

nmap('<leader>kw', ':lua Whitespace()<cr>')

-- C-; inserts current date in ISO8601 format, à la Excel
-- Requires configuring the terminal to send the correct sequence; ref
-- http://www.leonerd.org.uk/hacks/fixterms/. The correct sequence, in general, is `CSI
-- codepoint;modifier u`, where CSI is 'Esc-[', _codepoint_ is the decimal unicode
-- value (here, 59), and _modifier_ is chosen from
-- None Shift Alt A+S Ctrl C+S C+A C+A+
-- 1    2     3   4   5    6   7   8
-- For alacritty, e.g., the keybinding to configure i
-- - { key: Semicolon, mods: Control, chars: "\x1b[59;5u" }
imap('<C-;>', '<C-R>=strftime("%F")<CR>')

-- this fnamemodify invocations turns the absolute path from expand('%') into a path
-- relative to nvim's launch directory
nmap('<leader>l', ':let @+=fnamemodify(expand("%"), ":~:.") . ":" . line(".")<CR>')

-- Setup lazy.nvim
require("lazy").setup({
  spec = {
    { import = "plugins" },
  },
  install = { colorscheme = { "habamax" } },
  checker = { enabled = false },
})

-- set cursorline highlight to an underline. Has to happen after lazy setup, since
-- loading the colorscheme will overwrite any custom highlights.
vim.api.nvim_set_hl(0, 'CursorLine', { underline = true })