From 9d10cb05a2199eefb43d6f6ebdd48a2af9b7cdaa Mon Sep 17 00:00:00 2001
From: "flyingscorpio@clevo" <tfranken@protonmail.com>
Date: Sat, 13 Aug 2022 13:57:27 +0200
Subject: [PATCH] Integrate tab for luasnip and completion

---
 .../files/lua/plugins/options/completion.lua  | 23 +++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/roles/neovim/files/lua/plugins/options/completion.lua b/roles/neovim/files/lua/plugins/options/completion.lua
index 497ede0..b168c09 100644
--- a/roles/neovim/files/lua/plugins/options/completion.lua
+++ b/roles/neovim/files/lua/plugins/options/completion.lua
@@ -1,7 +1,10 @@
 -- Completion
 
 vim.opt.completeopt = { 'menu', 'menuone', 'noselect' }
+
+local luasnip = require'luasnip'
 local cmp = require'cmp'
+
 if cmp then
   cmp.setup({
     snippet = {
@@ -18,8 +21,24 @@ if cmp then
       ['<C-f>'] = cmp.mapping.scroll_docs(4),
       ['<C-Space>'] = cmp.mapping.complete(),
       ['<C-e>'] = cmp.mapping.abort(),
-      ['<Tab>'] = cmp.mapping.select_next_item(),
-      ['<S-Tab>'] = cmp.mapping.select_prev_item(),
+      ['<Tab>'] = cmp.mapping(function (fallback)
+        if cmp.visible() then
+          cmp.select_next_item()
+        elseif luasnip.expand_or_jumpable() then
+          luasnip.expand_or_jump()
+        else
+          fallback()
+        end
+      end, { 'i', 's' }),
+      ['<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' }),
       ['<CR>'] = cmp.mapping.confirm({ select = false }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
     }),
     sources = cmp.config.sources({