Move color selection to format.c

1 files changed, 23 insertions, 2 deletions

diff --git a/format.c b/format.c
index 8c2b0ed..58735c5 100644
--- a/format.c
+++ b/format.c
@@ -14,12 +14,33 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <wchar.h>
-#include <stdlib.h>
 #include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <wchar.h>
 
 #include "chat.h"
 
+// Adapted from <https://github.com/cbreeden/fxhash/blob/master/lib.rs>.
+static uint32_t hashChar(uint32_t hash, char ch) {
+	hash = (hash << 5) | (hash >> 27);
+	hash ^= ch;
+	hash *= 0x27220A95;
+	return hash;
+}
+
+enum IRCColor formatColor(const char *str) {
+	if (!str) return IRCDefault;
+	uint32_t hash = 0;
+	for (; str[0]; ++str) {
+		hash = hashChar(hash, str[0]);
+	}
+	while (IRCBlack == (hash & IRCLightGray)) {
+		hash = hashChar(hash, '\0');
+	}
+	return (hash & IRCLightGray);
+}
+
 void formatReset(struct Format *format) {
 	format->bold = false;
 	format->italic = false;