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/* 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;
}
static void touch(struct Entry *entry) {
if (head == entry) return;
remove(entry);
prepend(entry);
}
void tabTouch(const char *word) {
for (struct Entry *entry = head; entry; entry = entry->next) {
if (strcmp(entry->word, word)) continue;
touch(entry);
return;
}
struct Entry *entry = malloc(sizeof(*entry));
if (!entry) err(EX_OSERR, "malloc");
entry->word = strdup(word);
prepend(entry);
}
void tabReplace(const char *prev, const char *next) {
tabTouch(prev);
free(head->word);
head->word = strdup(next);
}
static struct Entry *match;
void tabRemove(const char *word) {
for (struct Entry *entry = head; entry; entry = entry->next) {
if (strcmp(entry->word, word)) continue;
remove(entry);
if (match == entry) match = entry->next;
free(entry->word);
free(entry);
return;
}
}
const char *tabNext(const char *prefix) {
size_t len = strlen(prefix);
struct Entry *start = (match ? match->next : head);
for (struct Entry *entry = start; entry; entry = entry->next) {
if (strncasecmp(entry->word, prefix, len)) continue;
match = entry;
return entry->word;
}
if (!match) return NULL;
match = NULL;
return tabNext(prefix);
}
void tabAccept(void) {
if (match) touch(match);
match = NULL;
}
void tabReject(void) {
match = NULL;
}
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