dotfiles/.config/nvim/lua/my/completion.lua

local cmp = require('cmp')
local luasnip = require('luasnip')
local lspkind = require('lspkind')

if cmp and luasnip then
    cmp.setup({
        snippet = {
            expand = function(args)
                luasnip.lsp_expand(args.body)
            end,
        },
        window = {
            completion = cmp.config.window.bordered(),
            documentation = cmp.config.window.bordered(),
        },
        formatting = {
            format = lspkind.cmp_format({
                mode = "symbol_text",
                maxwidth = math.floor(vim.o.columns / 2),
                ellipsis_char = '…',
                menu = ({
                    buffer = "[Buffer]",
                    nvim_lsp = "[LSP]",
                    luasnip = "[LuaSnip]",
                    nvim_lua = "[Lua]",
                    latex_symbols = "[Latex]",
                })
            }),
        },
        mapping = cmp.mapping.preset.insert({
            ['<S-PageUp>'] = cmp.mapping.scroll_docs(-4),
            ['<S-PageDown>'] = cmp.mapping.scroll_docs(4),
            ['<C-Space>'] = cmp.mapping.complete(),
            ['<C-e>'] = cmp.mapping.abort(),
            ['<Left>'] = cmp.mapping.abort(),
            ['<CR>'] = cmp.mapping.confirm({ select = false }),
            ['<Tab>'] = cmp.mapping(function(fallback)
                if cmp.visible() then
                    cmp.select_next_item()
                elseif luasnip.expandable() then
                    luasnip.expand({})
                elseif luasnip.expand_or_jumpable() then
                    luasnip.expand_or_jump()
                else
                    fallback()
                end
            end),
            ['<S-Tab>'] = cmp.mapping(function(fallback)
                if cmp.visible() then
                    cmp.select_prev_item()
                elseif luasnip.jumpable(-1) then
                    luasnip.jump(-1)
                else
                    fallback()
                end
            end)
        }),
        sources = cmp.config.sources({
            { name = 'nvim_lsp' },
            { name = 'luasnip' },
            { name = 'nvim_lua' },
            { name = 'dictionary' },
            { name = 'zsh' },
            { name = 'doxygen' },
        }, {
            { name = 'buffer' },
            -- { name = 'spell' },
        })
    })

    -- Use LSP symbols and buffer source for `/`
    cmp.setup.cmdline('/', {
        mapping = cmp.mapping.preset.cmdline(),
        sources = cmp.config.sources({
            { name = 'nvim_lsp_document_symbol' }
        }, {
            { name = 'buffer' }
        })
    })

    -- Use cmdline & path source for ':'
    cmp.setup.cmdline(':', {
        mapping = cmp.mapping.preset.cmdline(),
        sources = cmp.config.sources({
            { name = 'path' }
        }, {
            { name = 'cmdline' }
        })
    })

    require('cmp_dictionary').setup({
        dic = {
            ['gitcommit'] =
                vim.fn.stdpath('config') .. '/resources/git.dict',
            -- doesn't work, filetype is probably set too late
            ['NeogitCommitMessage'] =
                vim.fn.stdpath('config') .. '/resources/git.dict',
        }
    })

    -- add jump maps for select mode
    local map = require('my.functions').map
    map('s', '<Tab>', function() luasnip.jump(1) end)
    map('s', '<S-Tab>', function() luasnip.jump(-1) end)

    require('cmp_zsh').setup({
        filetypes = { 'zsh', 'bash', 'sh' }
    })
end