Add snippet mappings & being porting snippets

snippets/all.lua

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+# Global LuaSnip snippets
+
+local luasnip = require('luasnip')
+local snip = luasnip.snippet
+-- local sn = luasnip.snippet_node
+local text = luasnip.text_node
+-- local isn = luasnip.indent_snippet_node
+-- local t = luasnip.text_node
+local insert = luasnip.insert_node
+local func = luasnip.function_node
+-- local c = luasnip.choice_node
+-- local d = luasnip.dynamic_node
+-- local r = luasnip.restore_node
+-- local events = require("luasnip.util.events")
+-- local ai = require("luasnip.nodes.absolute_indexer")
+-- local extras = require("luasnip.extras")
+-- local l = extras.lambda
+-- local rep = extras.rep
+-- local p = extras.partial
+-- local m = extras.match
+-- local n = extras.nonempty
+-- local dl = extras.dynamic_lambda
+-- local fmt = require("luasnip.extras.fmt").fmt
+-- local fmta = require("luasnip.extras.fmt").fmta
+-- local conds = require("luasnip.extras.expand_conditions")
+-- local postfix = require("luasnip.extras.postfix").postfix
+-- local types = require("luasnip.util.types")
+-- local parse = require("luasnip.util.parser").parse_snippet
+-- local ms = luasnip.multi_snippet
+-- local k = require("luasnip.nodes.key_indexer").new_key
+
+local snippets = {}
+
+local function comment_prefix()
+  -- Get value of commentstring buffer option
+  local split = string.find(vim.bo.commentstring, '%s', 1, true)
+  if not split then
+    return ''
+  end
+  -- Slice commentstring prefix
+  local prefix = string.sub(vim.bo.commentstring, 1, split - 1)
+  local line = vim.api.nvim_get_current_line()
+  local cursor = vim.api.nvim_win_get_cursor(vim.api.nvim_get_current_win())
+  -- Check if the current line already has prefix before the cursor
+  if string.find(string.sub(line, 1, cursor[2] + 1), prefix, 1, true) then
+    return ''
+  end
+  return prefix .. ' '
+end
+
+local function comment_suffix()
+  -- Get value of commentstring buffer option
+  local split = string.find(vim.bo.commentstring, '%s', 1, true)
+  if not split then
+    return ''
+  end
+  -- Slice commentstring suffix
+  local suffix = string.sub(vim.bo.commentstring, split + 2, -1)
+  if string.len(suffix) == 0 then
+    return ''
+  end
+  return ' ' .. suffix
+end
+
+for _, name in ipairs({ 'fixme', 'todo', 'hack', 'warn', 'note' }) do
+  table.insert(snippets,
+    snip(name, {
+      func(comment_prefix),
+      text(string.upper(name) .. ': '),
+      insert(0),
+      func(comment_suffix),
+    })
+  )
+end
+
+return snippets

snippets/all.snippets

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+# Global SnipMate snippets
+
+snippet shrug
+	¯\_(ツ)_/¯
+
+snippet tableflip
+	(╯°▪°)╯︵┻━┻

snippets/cpp.snippets

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+snippet array
+	std::array<${1:T}, ${2:N}> ${3:array};${4}