lib: Update for new querying machinery

Port to c++ and use new APIs.

lib/mu-msg-file.hh

@@ -0,0 +1,105 @@
+/*
+** Copyright (C) 2012-2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+**
+** This program is free software; you can redistribute it and/or modify it
+** under the terms of the GNU General Public License as published by the
+** Free Software Foundation; either version 3, or (at your option) any
+** later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software Foundation,
+** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+**
+*/
+
+#ifndef MU_MSG_FILE_HH__
+#define MU_MSG_FILE_HH__
+
+namespace Mu {
+
+struct MuMsgFile;
+
+/**
+ * create a new message from a file
+ *
+ * @param path full path to the message
+ * @param mdir
+ * @param err error to receive (when function returns NULL), or NULL
+ *
+ * @return a new MuMsg, or NULL in case of error
+ */
+MuMsgFile *mu_msg_file_new (const char *path,
+			    const char* mdir, GError **err)
+                            G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
+
+/**
+ * destroy a MuMsgFile object
+ *
+ * @param self object to destroy, or NULL
+ */
+void mu_msg_file_destroy (MuMsgFile *self);
+
+
+
+/**
+ * get a specific header
+ *
+ * @param self a MuMsgFile instance
+ * @param header a header (e.g. 'X-Mailer' or 'List-Id')
+ *
+ * @return the value of the header or NULL if not found; free with g_free
+ */
+char* mu_msg_file_get_header (MuMsgFile *self, const char *header);
+
+
+/**
+ * get a string value for this message
+ *
+ * @param self a valid MuMsgFile
+ * @param msfid the message field id to get (must be of type string)
+ * @param do_free receives TRUE or FALSE, conveying if this string
+ * should be owned & freed (TRUE) or not by caller. In case 'FALSE',
+ * this function should be treated as if it were returning a const
+ * char*, and note that in that case the string is only valid as long
+ * as the MuMsgFile is alive, ie. before mu_msg_file_destroy
+ *
+ * @return a string, or NULL
+ */
+char* mu_msg_file_get_str_field (MuMsgFile *self,
+				 MuMsgFieldId msfid,
+				 gboolean *do_free)
+	                         G_GNUC_WARN_UNUSED_RESULT;
+
+
+/**
+ * get a string-list value for this message
+ *
+ * @param self a valid MuMsgFile
+ * @param msfid the message field id to get (must be of type string-list)
+ *
+ * @return a GSList*, or NULL; free with mu_str_free_list
+ */
+GSList* mu_msg_file_get_str_list_field (MuMsgFile *self, MuMsgFieldId msfid)
+					G_GNUC_WARN_UNUSED_RESULT;
+
+
+
+/**
+ * get a numeric value for this message -- the return value should be
+ * cast into the actual type, e.g., time_t, MuMsgPrio etc.
+ *
+ * @param self a valid MuMsgFile
+ * @param msfid the message field id to get (must be string-based one)
+ *
+ * @return the numeric value, or -1 in case of error
+ */
+gint64 mu_msg_file_get_num_field (MuMsgFile *self, MuMsgFieldId mfid);
+
+} // namespace Mu
+
+#endif /*MU_MSG_FILE_HH__*/