Add /tls certpath default

issue #871

src/command/cmd_ac.c

@@ -683,6 +683,7 @@ cmd_ac_init(void)
     tls_certpath_ac = autocomplete_new();
     autocomplete_add(tls_certpath_ac, "set");
     autocomplete_add(tls_certpath_ac, "clear");
+    autocomplete_add(tls_certpath_ac, "default");
 
     script_ac = autocomplete_new();
     autocomplete_add(script_ac, "run");

src/command/cmd_defs.c

@@ -200,6 +200,7 @@ static struct cmd_t command_defs[] =
             "/tls certpath",
             "/tls certpath set <path>",
             "/tls certpath clear",
+            "/tls certpath default",
             "/tls show on|off")
         CMD_DESC(
             "Handle TLS certificates. ")
@@ -215,6 +216,7 @@ static struct cmd_t command_defs[] =
             { "certpath",             "Show the trusted certificate path." },
             { "certpath set <path>",  "Specify filesystem path containing trusted certificates." },
             { "certpath clear",       "Clear the trusted certificate path." },
+            { "certpath default",     "Use default system certificate path, if it can be found." },
             { "show on|off",          "Show or hide the TLS indicator in the titlebar." })
         CMD_NOEXAMPLES
     },

src/command/cmd_funcs.c

@@ -171,14 +171,18 @@ cmd_tls_certpath(ProfWin *window, const char *const command, gchar **args)
         }
         return TRUE;
     } else if (g_strcmp0(args[1], "clear") == 0) {
-        prefs_set_string(PREF_TLS_CERTPATH, NULL);
+        prefs_set_string(PREF_TLS_CERTPATH, "none");
         cons_show("Certificate path cleared");
         return TRUE;
+    } else if (g_strcmp0(args[1], "default") == 0) {
+        prefs_set_string(PREF_TLS_CERTPATH, NULL);
+        cons_show("Certificate path defaulted to finding system certpath.");
+        return TRUE;
     } else if (args[1] == NULL) {
-        char *path = prefs_get_string(PREF_TLS_CERTPATH);
+        char *path = prefs_get_tls_certpath();
         if (path) {
             cons_show("Trusted certificate path: %s", path);
-            prefs_free_string(path);
+            free(path);
         } else {
             cons_show("No trusted certificate path set.");
         }