feat(picker): Add a snacks picker with jj status command

lua/jj/utils.lua

@@ -1,25 +1,44 @@
 --- @class jj.utils
-local M = {}
+local M = {
+	executable_cache = {},
+	dependency_cache = {},
+}
 
 --- Cache for executable checks to avoid repeated system calls
-local executable_cache = {}
 
 --- Check if an executable exists in PATH
 --- @param name string The name of the executable to check
 --- @return boolean True if executable exists, false otherwise
 function M.has_executable(name)
-	if executable_cache[name] ~= nil then
-		return executable_cache[name]
+	if M.executable_cache[name] ~= nil then
+		return M.executable_cache[name]
 	end
 
 	local exists = vim.fn.executable(name) == 1
-	executable_cache[name] = exists
+	M.executable_cache[name] = exists
 	return exists
 end
 
+--- Check if the dependency is currently installed
+--- @param module string The dependency module
+--- @return boolean
+function M.has_dependency(module)
+	if M.dependency_cache[module] ~= nil then
+		return true
+	end
+
+	local exists, _ = pcall(require, module)
+	if not exists then
+		M.notify(string.format("Module %s not installed", module), vim.log.levels.ERROR)
+		return false
+	end
+
+	return true
+end
+
 --- Clear the executable cache (useful for testing or if PATH changes)
 function M.clear_executable_cache()
-	executable_cache = {}
+	M.executable_cache = {}
 end
 
 --- Check if jj executable exists, show error if not
@@ -34,15 +53,20 @@ end
 
 --- Execute a system command and return output with error handling
 --- @param cmd string The command to execute
---- @param error_prefix string Optional error message prefix
+--- @param error_prefix string|nil Optional error message prefix
 --- @return string|nil output The command output, or nil if failed
 --- @return boolean success Whether the command succeeded
 function M.execute_command(cmd, error_prefix)
 	local output = vim.fn.system(cmd)
 	local success = vim.v.shell_error == 0
 
-	if not success and error_prefix then
-		local error_message = string.format("%s: %s", error_prefix, output)
+	if not success then
+		local error_message
+		if error_prefix then
+			error_message = string.format("%s: %s", error_prefix, output)
+		else
+			error_message = output
+		end
 		M.notify(error_message, vim.log.levels.ERROR)
 		return nil, false
 	end
@@ -57,7 +81,7 @@ function M.is_jj_repo()
 		return false
 	end
 
-	local _, success = M.execute_command("jj status", "")
+	local _, success = M.execute_command("jj status")
 	return success
 end
 
@@ -68,7 +92,7 @@ function M.get_jj_root()
 		return nil
 	end
 
-	local output, success = M.execute_command("jj root", "")
+	local output, success = M.execute_command("jj root")
 	if success and output then
 		return vim.trim(output)
 	end