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local ls = require "luasnip"
local snippet_from_nodes = ls.sn
local c = ls.choice_node
local t = ls.text_node
local d = ls.dynamic_node
local i = ls.insert_node
local rep = require("luasnip.extras").rep
local fmt = require("luasnip.extras.fmt").fmt
local get_node_text = vim.treesitter.get_node_text
vim.treesitter.query.set(
"go",
"LuaSnip_Result",
[[
[
(method_declaration result: (_) @id)
(function_declaration result: (_) @id)
(func_literal result: (_) @id)
]
]]
)
local transform = function(text, info)
if text == "int" then
return t "0"
elseif text == "error" then
if info then
info.index = info.index + 1
return c(info.index, {
t(string.format('fmt.Errorf("%s %%w", %s)', info.func_name, info.err_name)),
t(info.err_name),
})
else
return t "err"
end
elseif text == "bool" then
return t "false"
elseif text == "string" then
return t '""'
elseif string.find(text, "*", 1, true) then
return t "nil"
end
return t(text)
end
local handlers = {
["parameter_list"] = function(node, info)
local result = {}
local count = node:named_child_count()
for idx = 0, count - 1 do
table.insert(result, transform(get_node_text(node:named_child(idx), 0), info))
if idx ~= count - 1 then
table.insert(result, t { ", " })
end
end
return result
end,
["type_identifier"] = function(node, info)
local text = get_node_text(node, 0)
return { transform(text, info) }
end,
}
-- `nvim-treesitter.locals`/`ts_utils` no existen en la rama `main`; subimos a
-- mano por los padres del nodo bajo el cursor hasta la función que lo contiene.
local function go_result_type(info)
local function_node
local node = vim.treesitter.get_node()
while node do
local kind = node:type()
if kind == "function_declaration" or kind == "method_declaration" or kind == "func_literal" then
function_node = node
break
end
node = node:parent()
end
if not function_node then
return
end
local query = vim.treesitter.query.get("go", "LuaSnip_Result")
if not query then
return
end
for _, node in query:iter_captures(function_node, 0) do
if handlers[node:type()] then
return handlers[node:type()](node, info)
end
end
end
local go_ret_vals = function(args)
local info = { index = 0, err_name = args[1][1], func_name = args[2][1] }
return snippet_from_nodes(nil, go_result_type(info))
end
local M = {
main = {
t { "func main() {", "\t" },
i(0),
t { "", "}" },
},
ef = {
i(1, { "val" }),
t ", err := ",
i(2, { "f" }),
t "(",
i(3),
t ")",
i(0),
},
efi = {
i(1, { "val" }),
", ",
i(2, { "err" }),
" := ",
i(3, { "f" }),
"(",
i(4),
")",
t { "", "if " },
rep(2),
t { " != nil {", "\treturn " },
d(5, go_ret_vals, { 2, 3 }),
t { "", "}" },
i(0),
},
}
M.f = fmt("func {}({}) {} {{\n\t{}\n}}", { i(1, "name"), i(2), i(3), i(0) })
return M
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