102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <err.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include "chat.h"
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static struct Entry {
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char *word;
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struct Entry *prev;
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struct Entry *next;
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} *head;
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static void prepend(struct Entry *entry) {
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entry->prev = NULL;
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entry->next = head;
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if (head) head->prev = entry;
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head = entry;
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}
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static void remove(struct Entry *entry) {
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if (entry->prev) entry->prev->next = entry->next;
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if (entry->next) entry->next->prev = entry->prev;
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if (head == entry) head = entry->next;
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}
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static void touch(struct Entry *entry) {
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if (head == entry) return;
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remove(entry);
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prepend(entry);
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}
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void tabTouch(const char *word) {
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for (struct Entry *entry = head; entry; entry = entry->next) {
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if (strcmp(entry->word, word)) continue;
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touch(entry);
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return;
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}
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struct Entry *entry = malloc(sizeof(*entry));
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if (!entry) err(EX_OSERR, "malloc");
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entry->word = strdup(word);
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prepend(entry);
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}
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void tabReplace(const char *prev, const char *next) {
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tabTouch(prev);
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free(head->word);
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head->word = strdup(next);
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}
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static struct Entry *match;
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void tabRemove(const char *word) {
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for (struct Entry *entry = head; entry; entry = entry->next) {
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if (strcmp(entry->word, word)) continue;
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remove(entry);
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if (match == entry) match = entry->next;
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free(entry->word);
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free(entry);
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return;
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}
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}
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const char *tabNext(const char *prefix) {
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size_t len = strlen(prefix);
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struct Entry *start = (match ? match->next : head);
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for (struct Entry *entry = start; entry; entry = entry->next) {
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if (strncasecmp(entry->word, prefix, len)) continue;
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match = entry;
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return entry->word;
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}
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if (!match) return NULL;
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match = NULL;
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return tabNext(prefix);
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}
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void tabAccept(void) {
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if (match) touch(match);
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match = NULL;
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}
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void tabReject(void) {
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match = NULL;
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}
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