Populate tab-complete list

Makefile

@@ -3,7 +3,7 @@ CFLAGS += -Wall -Wextra -Wpedantic
 CFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
 LDLIBS = -lcursesw -ltls
-OBJS = chat.o handle.o input.o irc.o pls.o ui.o
+OBJS = chat.o handle.o input.o irc.o pls.o tab.o ui.o
 
 all: tags chat
 

README

@@ -8,4 +8,5 @@ This software targets FreeBSD and requires LibreSSL.
 	irc.c       TLS client connection
 	input.c     Input command handling
 	handle.c    Incoming command handling
+	tab.c       Tab-complete
 	pls.c       Functions which should not have to be written

chat.h

@@ -60,5 +60,9 @@ void uiFmt(const wchar_t *format, ...);
 void handle(char *line);
 void input(wchar_t *line);
 
+void tabTouch(const char *word);
+void tabRemove(const char *word);
+void tabReplace(const char *prev, const char *next);
+
 wchar_t *wcssep(wchar_t **stringp, const wchar_t *delim);
 int vaswprintf(wchar_t **ret, const wchar_t *format, va_list ap);

handle.c

@@ -81,6 +81,7 @@ static void handleJoin(char *prefix, char *params) {
 		free(chat.user);
 		chat.user = strdup(user);
 	}
+	tabTouch(nick);
 	uiFmt(
 		"\3%d%s\3 arrives in \3%d%s\3",
 		color(user), nick, color(chan), chan
@@ -91,6 +92,7 @@ static void handlePart(char *prefix, char *params) {
 	char *nick = prift(&prefix);
 	char *user = prift(&prefix);
 	char *chan = shift(&params);
+	tabRemove(nick);
 	if (params) {
 		char *mesg = shift(&params);
 		uiFmt(
@@ -108,6 +110,7 @@ static void handlePart(char *prefix, char *params) {
 static void handleQuit(char *prefix, char *params) {
 	char *nick = prift(&prefix);
 	char *user = prift(&prefix);
+	tabRemove(nick);
 	if (params) {
 		char *mesg = shift(&params);
 		char *quot = (mesg[0] == '"') ? "" : "\"";
@@ -126,6 +129,7 @@ static void handleKick(char *prefix, char *params) {
 	char *chan = shift(&params);
 	char *kick = shift(&params);
 	char *mesg = shift(&params);
+	tabRemove(nick);
 	uiFmt(
 		"\3%d%s\3 kicks \3%d%s\3 out of \3%d%s\3, \"%s\"",
 		color(user), nick, color(kick), kick, color(chan), chan, mesg
@@ -176,6 +180,7 @@ static void handle352(char *prefix, char *params) {
 	shift(&params);
 	shift(&params);
 	char *nick = shift(&params);
+	tabTouch(nick);
 	size_t cap = sizeof(who.buf) - who.len;
 	int len = snprintf(
 		&who.buf[who.len], cap,
@@ -204,6 +209,7 @@ static void handleNick(char *prefix, char *params) {
 		free(chat.nick);
 		chat.nick = strdup(next);
 	}
+	tabReplace(prev, next);
 	uiFmt(
 		"\3%d%s\3 is now known as \3%d%s\3",
 		color(user), prev, color(user), next
@@ -215,6 +221,7 @@ static void handlePrivmsg(char *prefix, char *params) {
 	char *user = prift(&prefix);
 	shift(&params);
 	char *mesg = shift(&params);
+	tabTouch(nick);
 	if (mesg[0] == '\1') {
 		strsep(&mesg, " ");
 		char *action = strsep(&mesg, "\1");
@@ -230,6 +237,7 @@ static void handleNotice(char *prefix, char *params) {
 	char *chan = shift(&params);
 	char *mesg = shift(&params);
 	if (strcmp(chat.chan, chan)) return;
+	tabTouch(nick);
 	uiFmt("-\3%d%s\3- %s", color(user), nick, mesg);
 }
 

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);
+}