Add /ignore message filtering patterns

1 files changed, 73 insertions, 0 deletions

diff --git a/ignore.c b/ignore.c
new file mode 100644
index 0000000..5c14b7d
--- /dev/null
+++ b/ignore.c
@@ -0,0 +1,73 @@
+/* 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 <fnmatch.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include "chat.h"
+
+struct Ignore ignore;
+
+const char *ignoreAdd(const char *pattern) {
+	if (ignore.len == IgnoreCap) errx(EX_CONFIG, "ignore limit exceeded");
+	uint ex = 0, sp = 0;
+	for (const char *ch = pattern; *ch; ++ch) {
+		if (*ch == '!') ex++;
+		if (*ch == ' ') sp++;
+	}
+	char **dest = &ignore.patterns[ignore.len++];
+	if (!ex && !sp) {
+		asprintf(dest, "%s!*@* * *", pattern);
+	} else if (sp < 1) {
+		asprintf(dest, "%s * *", pattern);
+	} else if (sp < 2) {
+		asprintf(dest, "%s *", pattern);
+	} else {
+		*dest = strdup(pattern);
+	}
+	if (!*dest) err(EX_OSERR, "strdup");
+	return *dest;
+}
+
+bool ignoreRemove(const char *pattern) {
+	bool found = false;
+	for (size_t i = 0; i < ignore.len; ++i) {
+		if (strcasecmp(ignore.patterns[i], pattern)) continue;
+		free(ignore.patterns[i]);
+		ignore.patterns[i] = ignore.patterns[--ignore.len];
+		found = true;
+	}
+	return found;
+}
+
+enum Heat ignoreCheck(enum Heat heat, const struct Message *msg) {
+	char match[512];
+	snprintf(
+		match, sizeof(match), "%s!%s@%s %s %s",
+		msg->nick, msg->user, msg->host, msg->cmd,
+		(msg->params[0] ? msg->params[0] : "")
+	);
+	for (size_t i = 0; i < ignore.len; ++i) {
+		if (fnmatch(ignore.patterns[i], match, FNM_CASEFOLD)) continue;
+		return Ice;
+	}
+	return heat;
+}