mu4e: use the new command-parser

Update mu4e-proc to use the new mu4e <-> mu protocol

lib/utils/mu-utils.cc

@@ -445,6 +445,33 @@ Mu::size_to_string (const std::string& val, bool is_first)
 }
 
 
+std::string
+Mu::quoted (const std::string& str)
+{
+        std::string res{"\""};
+        for (auto&& c : str) {
+                if (c == '\\' || c == '\"')
+                        res += '\\';
+                res += c;
+        }
+
+        return res + '"';
+}
+
+// std::string
+// Mu::quoted (const char* str)
+// {
+//         if (!str)
+//                 return str;
+
+//         char *s{g_strescape(str, NULL)};
+//         auto res = format("\"%s\"", s ? s : "");
+//         g_free(s);
+
+//         return res;
+// }
+
+
 void
 Mu::assert_equal(const std::string& s1, const std::string& s2)
 {

lib/utils/mu-utils.hh

@@ -93,6 +93,17 @@ std::string format (const char *frm, ...) __attribute__((format(printf, 1, 2)));
 std::string format (const char *frm, va_list args) __attribute__((format(printf, 1, 0)));
 
 
+/**
+ * Quote a string -- put in "" and escape any special characters by putting '\'
+ * in front of them.
+ *
+ * @param str
+ *
+ * @return
+ */
+std::string quoted (const std::string& str);
+
+
 /**
  * Convert an ISO date to the corresponding time expressed as a string
  * with a 10-digit time_t