IRC client
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color.c 1.5KB

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  1. /* Copyright (C) 2019 C. McEnroe <june@causal.agency>
  2. *
  3. * This program is free software: you can redistribute it and/or modify
  4. * it under the terms of the GNU Affero General Public License as published by
  5. * the Free Software Foundation, either version 3 of the License, or
  6. * (at your option) any later version.
  7. *
  8. * This program is distributed in the hope that it will be useful,
  9. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11. * GNU Affero General Public License for more details.
  12. *
  13. * You should have received a copy of the GNU Affero General Public License
  14. * along with this program. If not, see <http://www.gnu.org/licenses/>.
  15. */
  16. #include <stdint.h>
  17. #include "chat.h"
  18. // Adapted from <https://github.com/cbreeden/fxhash/blob/master/lib.rs>.
  19. static uint32_t hashChar(uint32_t hash, char ch) {
  20. hash = (hash << 5) | (hash >> 27);
  21. hash ^= ch;
  22. hash *= 0x27220A95;
  23. return hash;
  24. }
  25. enum IRCColor colorGen(const char *str) {
  26. if (!str) return IRCDefault;
  27. uint32_t hash = 0;
  28. for (; str[0]; ++str) {
  29. hash = hashChar(hash, str[0]);
  30. }
  31. while (IRCBlack == (hash & IRCLightGray)) {
  32. hash = hashChar(hash, '\0');
  33. }
  34. return (hash & IRCLightGray);
  35. }
  36. static enum IRCColor colors[TagsLen];
  37. struct Tag colorTag(struct Tag tag, const char *gen) {
  38. if (!colors[tag.id]) colors[tag.id] = 1 + colorGen(gen);
  39. return tag;
  40. }
  41. enum IRCColor colorFor(struct Tag tag) {
  42. return colors[tag.id] ? colors[tag.id] - 1 : IRCDefault;
  43. }