From 0daf201a8faed0b5eb4a9b545bcc963f9a2793a5 Mon Sep 17 00:00:00 2001
From: Christoph Urlacher <christoph.urlacher@protonmail.com>
Date: Fri, 11 Oct 2024 13:48:08 +0200
Subject: [PATCH] Neovim: Add sample LaTeX snippet

---
 home/modules/neovim/default.nix        | 14 ++++++++---
 home/modules/neovim/snippets_latex.lua | 33 ++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 3 deletions(-)
 create mode 100644 home/modules/neovim/snippets_latex.lua

diff --git a/home/modules/neovim/default.nix b/home/modules/neovim/default.nix
index 444d8ab5..570b27ea 100644
--- a/home/modules/neovim/default.nix
+++ b/home/modules/neovim/default.nix
@@ -112,6 +112,9 @@ in {
         # For this its probably important to set the default filetype to tex (see extraConfigLua)
         "ftplugin/tex/mappings.lua".text = mylib.generators.toLuaKeymap (import ./mappings_latex.nix {});
         "ftplugin/markdown/mappings.lua".text = mylib.generators.toLuaKeymap (import ./mappings_markdown.nix {});
+
+        # Luasnip searches the luasnippets folder in the runtimepath
+        "luasnippets/tex.lua".text = builtins.readFile ./snippets_latex.lua;
       };
 
       # extraLuaPackages = with pkgs.lua51Packages; [];
@@ -1052,8 +1055,15 @@ in {
             config = ''
               function(_, opts)
                 require("luasnip").config.set_config(opts)
+
+                -- Load snippets. Because we don't set "path", the nvim runtimepath is searched.
+                -- Snippet files are added through nixvim's extraFiles (see at the top).
+                require("luasnip.loaders.from_lua").lazy_load({})
               end
             '';
+            opts = {
+              enable_autosnippets = false;
+            };
           };
 
           ltex-extra = {
@@ -1779,9 +1789,7 @@ in {
           lint # Lint documents on save
           lspconfig # Language server configurations for different languages
           lualine # Status line
-
-          luasnip # Snippets # TODO: How to add snippets, maybe use luasnip from nixvim directly?
-
+          luasnip # Snippets
           ltex-extra # Additional ltex lsp support, e.g. for add-to-dictionary action
 
           markview # Markdown support # TODO: Disable in help buffers + confiure a bit more
diff --git a/home/modules/neovim/snippets_latex.lua b/home/modules/neovim/snippets_latex.lua
new file mode 100644
index 00000000..c6aec086
--- /dev/null
+++ b/home/modules/neovim/snippets_latex.lua
@@ -0,0 +1,33 @@
+return {
+	-- The first list contains manually expanded snippts
+	--
+	-- The fmta function accepts a string ([[]] denote multiline strings) and node table.
+	-- The node table entry order corresponds to the delimiters,
+	-- the indices denote the jumping order, 0 is jumped to last.
+	--
+	-- Example:
+	-- s("beg", fmta([[
+	-- 	   \begin{<>}
+	-- 	     <>
+	-- 	   \end{<>}]],
+	-- 	   { i(1), i(0), rep(1) }
+	-- )),
+	--
+	-- The first jumping position (1) fills the \begin{<>} (and \end{<>} because of the repeat).
+	-- The last jumping position (0) fills the body.
+
+	-- \begin{environment}
+	s(
+		"beg",
+		fmta(
+			[[
+		        \begin{<>}
+		          <>
+		        \end{<>}
+	        ]],
+			{ i(1), i(0), rep(1) }
+		)
+	),
+}, {
+	-- The second list contains autosnippets
+}