1 files changed, 82 insertions, 1 deletions
diff --git a/config/nvim/lua/lsp.lua b/config/nvim/lua/lsp.lua
index 7f41534..efc3893 100644
--- a/config/nvim/lua/lsp.lua
+++ b/config/nvim/lua/lsp.lua
@@ -1,6 +1,88 @@
 vim.o.completeopt = "menuone,noselect"
 vim.o.shortmess = vim.o.shortmess .. "c"
 
+local has_words_before = function()
+    unpack = unpack or table.unpack
+    local line, col = unpack(vim.api.nvim_win_get_cursor(0))
+    return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
+end
+
+local luasnip = require("luasnip")
+local cmp = require("cmp")
+
+cmp.setup({
+    snippet = {
+        -- REQUIRED - you must specify a snippet engine
+        expand = function(args)
+            require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
+        end,
+    },
+    mapping = cmp.mapping.preset.insert({
+        -- Use <C-b/f> to scroll the docs
+        ['<C-b>'] = cmp.mapping.scroll_docs( -4),
+        ['<C-f>'] = cmp.mapping.scroll_docs(4),
+        -- Use <C-k/j> to switch in items
+        ['<C-k>'] = cmp.mapping.select_prev_item(),
+        ['<C-j>'] = cmp.mapping.select_next_item(),
+        -- Use <CR>(Enter) to confirm selection
+        -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+        ['<CR>'] = cmp.mapping.confirm({ select = true }),
+
+        -- A super tab
+        -- sourc: https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings#luasnip
+        ["<Tab>"] = cmp.mapping(function(fallback)
+            -- Hint: if the completion menu is visible select next one
+            if cmp.visible() then
+                cmp.select_next_item()
+            elseif has_words_before() then
+                cmp.complete()
+            else
+                fallback()
+            end
+        end, { "i", "s" }), -- i - insert mode; s - select mode
+        ["<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, { "i", "s" }),
+    }),
+
+  -- Let's configure the item's appearance
+  -- source: https://github.com/hrsh7th/nvim-cmp/wiki/Menu-Appearance
+  formatting = {
+      -- Set order from left to right
+      -- kind: single letter indicating the type of completion
+      -- abbr: abbreviation of "word"; when not empty it is used in the menu instead of "word"
+      -- menu: extra text for the popup menu, displayed after "word" or "abbr"
+      fields = { 'abbr', 'menu' },
+
+      -- customize the appearance of the completion menu
+      format = function(entry, vim_item)
+          vim_item.menu = ({
+              nvim_lsp = '[Lsp]',
+              luasnip = '[Luasnip]',
+              buffer = '[File]',
+              path = '[Path]',
+          })[entry.source.name]
+          return vim_item
+      end,
+  },
+
+  -- Set source precedence
+  sources = cmp.config.sources({
+      { name = 'nvim_lsp' },    -- For nvim-lsp
+      { name = 'nvim_lsp_signature_help' },
+      { name = 'luasnip' },     -- For luasnip user
+      { name = 'buffer' },      -- For buffer word completion
+      { name = 'path' },        -- For path completion
+      { name = 'treesitter' },
+  })
+})
+
 vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
     vim.lsp.diagnostic.on_publish_diagnostics, {
         virtual_text = true,
@@ -14,4 +96,3 @@ require("nvim-treesitter.configs").setup({
 })
 
 require("gitsigns").setup({})
-