feat: port most snippets from lentilus/fastex.nvim

lua/typstar/autosnippets.lua

@@ -0,0 +1,58 @@
+local M = {}
+local cfg = require('typstar.config').config.snippets
+local luasnip = require('luasnip')
+local fmta = require("luasnip.extras.fmt").fmta
+
+M.in_math = function() return vim.api.nvim_eval("typst#in_math()") == 1 end
+M.in_markup = function() return vim.api.nvim_eval("typst#in_markup()") == 1 end
+M.in_code = function() return vim.api.nvim_eval("typst#in_code()") == 1 end
+M.in_comment = function() return vim.api.nvim_eval("typst#in_comment()") == 1 end
+M.not_in_math = function() return not M.in_math() end
+M.not_in_markup = function() return not M.in_markup() end
+M.not_in_code = function() return not M.in_code() end
+M.not_in_comment = function() return not M.in_comment() end
+
+
+function M.cap(i)
+    return luasnip.function_node(function(_, snip) return snip.captures[i] end)
+end
+
+function M.get_visual(args, parent)
+    if (#parent.snippet.env.LS_SELECT_RAW > 0) then
+        return luasnip.snippet_node(nil, luasnip.insert_node(1, parent.snippet.env.LS_SELECT_RAW))
+    else -- If LS_SELECT_RAW is empty, return a blank insert node
+        return luasnip.snippet_node(nil, luasnip.insert_node(1))
+    end
+end
+
+function M.ri(insert_node_id)
+    return luasnip.function_node(function(args) return args[1][1] end, insert_node_id)
+end
+
+function M.snip(trigger, expand, insert, condition, priority)
+    priority = priority or 1000
+    return luasnip.snippet(
+        { trig = trigger, regTrig = true, wordtrig = false, priority = priority, snippetType = 'autosnippet' },
+        fmta(expand, { unpack(insert) }),
+        { condition = condition }
+    )
+end
+
+function M.start_snip(trigger, expand, insert, condition, priority)
+    return M.snip('^%s*' .. trigger, expand, insert, condition, priority)
+end
+
+function M.setup()
+    if cfg.enable then
+        local autosnippets = {}
+        for _, file in ipairs(cfg.modules) do
+            vim.list_extend(
+                autosnippets,
+                require(('typstar.snippets.%s'):format(file))
+            )
+        end
+        luasnip.add_snippets('typst', autosnippets)
+    end
+end
+
+return M