pySim-shell: add functionality to walk through the fs recursively

We might add functionality that may require to walk through the entire
filesystem tree to perform an action to all files at once. Lets add a
generic walker that gets a function pointer that can carray out a file
specific action then. Also add another command that just displays the
whole filesystem tree.

Change-Id: If93d24dfb80c83eda39303c936910fa1fa7f48f8
Related: OS#4963

pySim-shell.py

@@ -41,7 +41,7 @@ from pySim.utils import h2b, swap_nibbles, rpad, h2s
 from pySim.utils import dec_st, init_reader, sanitize_pin_adm, tabulate_str_list
 from pySim.card_handler import card_handler
 
-from pySim.filesystem import CardMF, RuntimeState
+from pySim.filesystem import CardMF, RuntimeState, CardDF, CardADF
 from pySim.ts_51_011 import CardProfileSIM, DF_TELECOM, DF_GSM
 from pySim.ts_102_221 import CardProfileUICC
 from pySim.ts_31_102 import ADF_USIM
@@ -142,6 +142,30 @@ class Iso7816Commands(CommandSet):
 		self._cmd.poutput(directory_str)
 		self._cmd.poutput("%d files" % len(selectables))
 
+	def walk(self, indent = 0, action = None, context = None):
+		"""Recursively walk through the file system, starting at the currently selected DF"""
+		files = self._cmd.rs.selected_file.get_selectables(flags = ['FNAMES', 'ANAMES'])
+		for f in files:
+			if not action:
+				output_str = "  " * indent + str(f) + (" " * 250)
+				output_str = output_str[0:25]
+				if isinstance(files[f], CardADF):
+					output_str += " " + str(files[f].aid)
+				else:
+					output_str += " " + str(files[f].fid)
+				output_str += " " + str(files[f].desc)
+				self._cmd.poutput(output_str)
+			if isinstance(files[f], CardDF):
+				fcp_dec = self._cmd.rs.select(f, self._cmd)
+				self.walk(indent + 1, action, context)
+				fcp_dec = self._cmd.rs.select("..", self._cmd)
+			elif action:
+				action(f, context)
+
+	def do_tree(self, opts):
+		"""Display a filesystem-tree with all selectable files"""
+		self.walk()
+
 
 
 @with_default_category('USIM Commands')