vim.g.mapleader = " "

local o = vim.o
o.number = true
o.relativenumber = true
o.tabstop = 4
o.shiftwidth = 4
o.expandtab = true
o.signcolumn = "yes"
o.swapfile = false
o.winborder = "single"
o.termguicolors = true
o.autoread = true

-- Folding: native treesitter folds (function/class/block-aware), no plugin needed.
-- `foldmethod=diff` (used automatically in :diffthis / fugitive / diffview windows)
-- takes over on its own and isn't affected by this.
o.foldmethod = "expr"
o.foldexpr = "v:lua.vim.treesitter.foldexpr()"
o.foldlevel = 99 -- start with everything open
o.foldlevelstart = 99

vim.api.nvim_create_autocmd({ "FocusGained", "BufEnter", "CursorHold", "CursorHoldI" }, {
    command = "if mode() != 'c' | checktime | endif",
})

-- `git show`/`git diff`/`git log -p` piped into nvim (e.g. `git show <hash> | nvim -`)
-- arrive as stdin with no filename, so normal filetype detection never fires
-- and folding/highlighting silently stay off. Sniff the content instead.
vim.api.nvim_create_autocmd("StdinReadPost", {
    callback = function()
        local first = vim.fn.getline(1)
        if first:match("^commit %x+") or first:match("^diff %-%-git ") or first:match("^From %x+") then
            vim.bo.filetype = "diff"
        end
    end,
})

vim.filetype.add({ extension = { asm = "asm", s = "asm", S = "asm" } })
vim.api.nvim_create_autocmd("FileType", {
    pattern = "asm",
    callback = function()
        vim.bo.tabstop = 8
        vim.bo.shiftwidth = 8
        vim.bo.softtabstop = 8
        vim.bo.expandtab = false
    end,
})

vim.diagnostic.config({
    virtual_text = false,
    virtual_lines = { current_line = true },
    severity_sort = true,
})