feat(nvim): pass module path to goimports

vim/lua/formatter_config.lua

@@ -7,8 +7,17 @@ local prettier = function()
 end
 
 local goimports = function()
+	local args = {}
+
+	local mod_path = Get_project_go_module_path()
+	if mod_path ~= "" then
+		table.insert(args, "-local")
+		table.insert(args, mod_path)
+	end
+
 	return {
 		exe = "goimports",
+		args = args,
 		stdin = true,
 	}
 end

vim/lua/helpers.lua

@@ -10,3 +10,30 @@ function Get_project_node_modules_path()
 	end
 	return base_path .. "/node_modules"
 end
+
+-- Return the project's go module path from go.mod, or an empty string if the file cannot be read.
+function Get_project_go_module_path()
+	local root_path = vim.fn.getcwd()
+	local mod_path = root_path .. "/go.mod"
+	if vim.fn.filereadable(mod_path) == 0 then
+		return ""
+	end
+
+	local file = io.open(mod_path, "r")
+	if file == nil then
+		return ""
+	end
+
+	io.input(file)
+	-- The first line of go.mod, something like:
+	-- module github.com/username/repo
+	local line = io.read()
+	io.close(file)
+
+	local match = string.match(line, "^module (.+)")
+	if match == nil then
+		return ""
+	end
+
+	return match
+end