ida: use ida-settings to persist rules directory

closes #268

capa/ida/plugin/form.py

@@ -12,6 +12,7 @@ import logging
 import collections
 
 import idaapi
+import ida_settings
 from PyQt5 import QtGui, QtCore, QtWidgets
 
 import capa.main
@@ -25,6 +26,7 @@ from capa.ida.plugin.model import CapaExplorerDataModel
 from capa.ida.plugin.proxy import CapaExplorerSortFilterProxyModel
 
 logger = logging.getLogger("capa")
+settings = ida_settings.IDASettings("capa")
 
 
 class CapaExplorerForm(idaapi.PluginForm):
@@ -303,12 +305,16 @@ class CapaExplorerForm(idaapi.PluginForm):
     def load_capa_results(self):
         """ run capa analysis and render results in UI """
         if not self.rule_path:
+            if "rule_path" in settings:
+                self.rule_path = settings["rule_path"]
+            else:
                 rule_path = self.ask_user_directory()
                 if not rule_path:
                     capa.ida.helpers.inform_user_ida_ui("You must select a rules directory to use for analysis.")
                     logger.warning("no rules directory selected. nothing to do.")
                     return
                 self.rule_path = rule_path
+                settings.user["rule_path"] = rule_path
 
         logger.info("-" * 80)
         logger.info(" Using rules from %s." % self.rule_path)
@@ -520,6 +526,9 @@ class CapaExplorerForm(idaapi.PluginForm):
         if not rule_path:
             logger.warning("no rules directory selected. nothing to do.")
             return
+
         self.rule_path = rule_path
+        settings.user["rule_path"] = rule_path
+
         if 1 == idaapi.ask_yn(1, "Run analysis now?"):
             self.reload()

setup.py

@@ -12,7 +12,7 @@ import sys
 import setuptools
 
 # halo==0.0.30 is the last version to support py2.7
-requirements = ["six", "tqdm", "pyyaml", "tabulate", "colorama", "termcolor", "ruamel.yaml", "wcwidth", "halo==0.0.30"]
+requirements = ["six", "tqdm", "pyyaml", "tabulate", "colorama", "termcolor", "ruamel.yaml", "wcwidth", "halo==0.0.30", "ida-settings=1.0.1"]
 
 if sys.version_info >= (3, 0):
     # py3