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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 {
struct Tag tag;
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 unlink(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;
unlink(entry);
prepend(entry);
}
static struct Entry *find(struct Tag tag, const char *word) {
for (struct Entry *entry = head; entry; entry = entry->next) {
if (entry->tag.id != tag.id) continue;
if (strcmp(entry->word, word)) continue;
return entry;
}
return NULL;
}
static void add(struct Tag tag, const char *word) {
struct Entry *entry = malloc(sizeof(*entry));
if (!entry) err(EX_OSERR, "malloc");
entry->tag = tag;
entry->word = strdup(word);
if (!entry->word) err(EX_OSERR, "strdup");
prepend(entry);
}
void tabTouch(struct Tag tag, const char *word) {
struct Entry *entry = find(tag, word);
if (entry) {
touch(entry);
} else {
add(tag, word);
}
}
void tabAdd(struct Tag tag, const char *word) {
if (!find(tag, word)) add(tag, word);
}
void tabReplace(struct Tag tag, const char *prev, const char *next) {
struct Entry *entry = find(tag, prev);
if (!entry) return;
touch(entry);
free(entry->word);
entry->word = strdup(next);
if (!entry->word) err(EX_OSERR, "strdup");
}
static struct Entry *iter;
void tabRemove(struct Tag tag, const char *word) {
for (struct Entry *entry = head; entry; entry = entry->next) {
if (entry->tag.id != tag.id) continue;
if (strcmp(entry->word, word)) continue;
if (iter == entry) iter = entry->prev;
unlink(entry);
free(entry->word);
free(entry);
return;
}
}
void tabClear(struct Tag tag) {
for (struct Entry *entry = head; entry; entry = entry->next) {
if (entry->tag.id != tag.id) continue;
if (iter == entry) iter = entry->prev;
unlink(entry);
free(entry->word);
free(entry);
}
}
struct Tag tabTag(const char *word) {
struct Entry *start = (iter ? iter->next : head);
for (struct Entry *entry = start; entry; entry = entry->next) {
if (strcmp(entry->word, word)) continue;
iter = entry;
return entry->tag;
}
iter = NULL;
return TagNone;
}
const char *tabNext(struct Tag tag, const char *prefix) {
size_t len = strlen(prefix);
struct Entry *start = (iter ? iter->next : head);
for (struct Entry *entry = start; entry; entry = entry->next) {
if (entry->tag.id != TagNone.id && entry->tag.id != tag.id) continue;
if (strncasecmp(entry->word, prefix, len)) continue;
iter = entry;
return entry->word;
}
if (!iter) return NULL;
iter = NULL;
return tabNext(tag, prefix);
}
void tabAccept(void) {
if (iter) touch(iter);
iter = NULL;
}
void tabReject(void) {
iter = NULL;
}
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