Fetch thread root envelopes for concat

1 files changed, 47 insertions, 0 deletions

diff --git a/concat.c b/concat.c
new file mode 100644
index 0000000..217662a
--- /dev/null
+++ b/concat.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
+ *
+ * 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 of the License, 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+
+#include "archive.h"
+#include "imap.h"
+
+static uint32_t threadRoot(struct List thread) {
+	if (!thread.len) errx(EX_PROTOCOL, "empty thread");
+	while (thread.ptr[0].type == List) {
+		thread = thread.ptr[0].list;
+		if (!thread.len) errx(EX_PROTOCOL, "empty subthread");
+	}
+	if (thread.ptr[0].type != Number) errx(EX_PROTOCOL, "invalid thread root");
+	return thread.ptr[0].number;
+}
+
+enum Atom concatFetch(FILE *imap, struct List threads) {
+	enum Atom tag = atom("concatFetch");
+	fprintf(imap, "%s UID FETCH ", Atoms[tag]);
+	for (size_t i = 0; i < threads.len; ++i) {
+		if (threads.ptr[i].type != List) errx(EX_PROTOCOL, "invalid thread");
+		uint32_t root = threadRoot(threads.ptr[i].list);
+		fprintf(imap, "%s%" PRIu32, (i ? "," : ""), root);
+	}
+	fprintf(imap, " (UID ENVELOPE)\r\n");
+	return tag;
+}