From ee2dcc3669ffe82ccb8502d028784041d4f4a798 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kier=C3=A1n=20Meinhardt?= <kmein@posteo.de>
Date: Wed, 2 Aug 2023 10:20:03 +0200
Subject: [PATCH] feat(neovim): luasnip and supertab

---
 lib/vim/init.lua | 63 +++++++++++++++++++++++++++++-------------------
 packages/vim.nix |  1 +
 2 files changed, 39 insertions(+), 25 deletions(-)

diff --git a/lib/vim/init.lua b/lib/vim/init.lua
index 6fcaa66..d335cb7 100644
--- a/lib/vim/init.lua
+++ b/lib/vim/init.lua
@@ -1,18 +1,46 @@
-local cmp = require'cmp'
+local cmp = require("cmp")
+local luasnip = require("luasnip")
+
+print(vim.g.snippet_directory)
+if vim.g.snippet_directory then
+  require("luasnip.loaders.from_vscode").lazy_load({
+    paths = { vim.g.snippet_directory }
+  })
+end
+
+luasnip.config.set_config({
+  history = true,
+  updateevents = "TextChanged,TextChangedI",
+  enable_autosnippets = true
+})
 
 cmp.setup({
-    snippet = {
+  snippet = {
     expand = function(args)
-      require("luasnip").lsp_expand(args.body)
+      luasnip.lsp_expand(args.body)
     end,
   },
-  mapping = cmp.mapping.preset.insert({
-    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
-    ['<C-f>'] = cmp.mapping.scroll_docs(4),
-    ['<C-Space>'] = cmp.mapping.complete(),
-    ['<C-e>'] = cmp.mapping.abort(),
-    ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
-  }),
+  mapping = {
+    -- https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings#super-tab-like-mapping
+    ['<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" }),
+  },
   sources = cmp.config.sources({
     { name = 'nvim_lsp' },
     { name = 'luasnip' },
@@ -21,21 +49,6 @@ cmp.setup({
   })
 })
 
--- -- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
--- cmp.setup.cmdline({ '/', '?' }, {
---   mapping = cmp.mapping.preset.cmdline(),
---   sources = {
---     { name = 'buffer' }
---   }
--- })
-
--- -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
--- cmp.setup.cmdline(':', {
---   mapping = cmp.mapping.preset.cmdline(),
---   sources = cmp.config.sources({
---     { name = 'path' }
---   })
--- })
 local capabilities = require('cmp_nvim_lsp').default_capabilities(vim.lsp.protocol.make_client_capabilities())
 
 local opts = { noremap=true, silent=true }
diff --git a/packages/vim.nix b/packages/vim.nix
index 4fdbadb..c01c79f 100644
--- a/packages/vim.nix
+++ b/packages/vim.nix
@@ -10,6 +10,7 @@
     customRC = ''
       source ${../lib/vim/shared.vim}
       source ${../lib/vim/init.vim}
+      let g:snippet_directory = '${vimPlugins.friendly-snippets}'
       luafile ${../lib/vim/init.lua}
     '';
     packages.nvim = with vimPlugins; {