snippets: load my own snippets

- Renames the snippets folder to my_snippets.
- Loads my snippets.
- Creates two snippet example available for all filetypes.
- Creates three snippets for markdown filetype.
- Adds the telescope luasnip plugin.
- Sets a keymaping to fuzzy search all available snippets (<leader>ss).

Co-Authored-by: iGor milhit <igor.milhit@unige.ch>

init.lua

@@ -195,6 +195,8 @@ require('lazy').setup({
     end,
   },
 
+  { 'benfowler/telescope-luasnip.nvim' },
+
   {
     -- Highlight, edit, and navigate code
     'nvim-treesitter/nvim-treesitter',
@@ -320,6 +322,7 @@ require('telescope').setup {
 
 -- Enable telescope fzf native, if installed
 pcall(require('telescope').load_extension, 'fzf')
+pcall(require('telescope').load_extension, 'luasnip')
 
 -- See `:help telescope.builtin`
 vim.keymap.set('n', '<leader>?', require('telescope.builtin').oldfiles, { desc = '[?] Find recently opened files' })
@@ -339,6 +342,7 @@ vim.keymap.set('n', '<leader>sw', require('telescope.builtin').grep_string, { de
 vim.keymap.set('n', '<leader>sg', require('telescope.builtin').live_grep, { desc = '[S]earch by [G]rep' })
 vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { desc = '[S]earch [D]iagnostics' })
 vim.keymap.set('n', '<leader>sb', require('telescope.builtin').buffers, { desc = '[S]earch [B]uffers' })
+vim.keymap.set('n', '<leader>ss', require'telescope'.extensions.luasnip.luasnip , { desc = '[S]earch [S]nippets' })
 
 -- [[ Configure Treesitter ]]
 -- See `:help nvim-treesitter`
@@ -519,9 +523,12 @@ luasnip.config.setup {
   snippets = {
     markdown = {},
   },
-  luasnip.filetype_extend("pandoc", {"markdown"})
+  luasnip.filetype_extend("pandoc", {"markdown"}),
 }
 
+-- Load snippets from ~/.config/nvim/LuaSnip/
+require("luasnip.loaders.from_lua").load({paths = "~/.config/nvim/my_snippets/"})
+
 cmp.setup {
   snippet = {
     expand = function(args)

my_snippets/all.lua

@@ -0,0 +1,14 @@
+return {
+  -- A snippet that expands the trigger "hi" into the string "Hello, world!".
+  require("luasnip").snippet(
+    { trig = "hi" },
+    { t("Hello, world!") }
+  ),
+
+  -- To return multiple snippets, use one `return` statement per snippet file
+  -- and return a table of Lua snippets.
+  require("luasnip").snippet(
+    { trig = "foo" },
+    { t("Another snippet.") }
+  )
+}

my_snippets/markdown.lua

@@ -0,0 +1,56 @@
+local ls = require("luasnip")
+local s = ls.snippet
+local t = ls.text_node
+local i = ls.insert_node
+local f = ls.function_node
+
+-- Function to get the datetime
+--   with daylight saving time
+--   according to the locale
+local get_date = function()
+  return os.date("%Y-%m-%dT%H:%M:%S%z")
+end
+
+-- Function to get an id based on the datetime 
+local get_id = function()
+  return os.date("%Y%m%d%H%M%S")
+end
+
+return {
+  s(
+    {
+      trig = "datetime",
+      dscr = "Insert datetime with locale daylight saving"
+    },
+    {
+      f(get_date, {})
+    }
+  ),
+  s(
+    {
+      trig = "id",
+      dscr = "Insert an id based on the datetime"
+    },
+    {
+      f(get_id, {})
+    }
+  ),
+  s(
+    {
+      trig = "yaml",
+      dscr = "Insert a YAML frontmatter for markdown"
+    },
+    {
+      t { "---", "title: " },
+      i(1, "title"),
+      t{ "", "date: " },
+      f(get_date, {}),
+      t{ "", "id: " },
+      f(get_id, {}),
+      t{ "","tags: [" },
+      i(2, "tags"),
+      t{ "]", "---", "" },
+      i(0),
+    }
+  )
+}