Populate tab-complete list

1 files changed, 72 insertions, 0 deletions

diff --git a/tab.c b/tab.c
new file mode 100644
index 0000000..56fe649
--- /dev/null
+++ b/tab.c
@@ -0,0 +1,72 @@
+/* Copyright (C) 2018  Curtis McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include "chat.h"
+
+static struct Entry {
+	char *word;
+	struct Entry *prev;
+	struct Entry *next;
+} *head;
+
+static void prepend(struct Entry *entry) {
+	entry->prev = NULL;
+	entry->next = head;
+	if (head) head->prev = entry;
+	head = entry;
+}
+
+static void remove(struct Entry *entry) {
+	if (entry->prev) entry->prev->next = entry->next;
+	if (entry->next) entry->next->prev = entry->prev;
+	if (head == entry) head = entry->next;
+}
+
+void tabTouch(const char *word) {
+	for (struct Entry *entry = head; entry; entry = entry->next) {
+		if (strcmp(entry->word, word)) continue;
+		if (head == entry) return;
+		remove(entry);
+		prepend(entry);
+		return;
+	}
+
+	struct Entry *entry = malloc(sizeof(*entry));
+	if (!entry) err(EX_OSERR, "malloc");
+	entry->word = strdup(word);
+	prepend(entry);
+}
+
+void tabRemove(const char *word) {
+	for (struct Entry *entry = head; entry; entry = entry->next) {
+		if (strcmp(entry->word, word)) continue;
+		remove(entry);
+		free(entry->word);
+		free(entry);
+		return;
+	}
+}
+
+void tabReplace(const char *prev, const char *next) {
+	tabTouch(prev);
+	free(head->word);
+	head->word = strdup(next);
+}