core: add values djb2_32 and sum_32 for option weechat.look.nick_color_hash (issue #1394)

3 files changed, 28 insertions, 2 deletions

diff --git a/src/core/wee-config.c b/src/core/wee-config.c
index d09ed7773..cfde1bdb3 100644
--- a/src/core/wee-config.c
+++ b/src/core/wee-config.c
@@ -3240,8 +3240,10 @@ config_weechat_init_options ()
         "nick_color_hash", "integer",
         N_("hash algorithm used to find the color for a nick: djb2 = variant "
            "of djb2 (position of letters matters: anagrams of a nick have "
-           "different color), sum = sum of letters"),
-        "djb2|sum", 0, 0, "djb2", NULL, 0,
+           "different color), djb2_32 = variant of djb2 using 32-bit instead "
+           "of 64-bit integer, sum = sum of letters, sum_32 = sum of letters "
+           "using 32-bit instead of 64-bit integer"),
+        "djb2|sum|djb2_32|sum_32", 0, 0, "djb2", NULL, 0,
         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
     config_look_nick_color_stop_chars = config_file_new_option (
         weechat_config_file, ptr_section,
diff --git a/src/core/wee-config.h b/src/core/wee-config.h
index d3fc51694..8cf1a61bf 100644
--- a/src/core/wee-config.h
+++ b/src/core/wee-config.h
@@ -58,6 +58,8 @@ enum t_config_look_nick_color_hash
 {
     CONFIG_LOOK_NICK_COLOR_HASH_DJB2 = 0,
     CONFIG_LOOK_NICK_COLOR_HASH_SUM,
+    CONFIG_LOOK_NICK_COLOR_HASH_DJB2_32,
+    CONFIG_LOOK_NICK_COLOR_HASH_SUM_32,
 };
 
 enum t_config_look_prefix_align
diff --git a/src/gui/gui-nick.c b/src/gui/gui-nick.c
index e2685dc5e..9a575cb2a 100644
--- a/src/gui/gui-nick.c
+++ b/src/gui/gui-nick.c
@@ -47,6 +47,7 @@ int
 gui_nick_hash_color (const char *nickname)
 {
     uint64_t color;
+    uint32_t color_32;
     const char *ptr_nick;
 
     if (!nickname || !nickname[0])
@@ -81,6 +82,27 @@ gui_nick_hash_color (const char *nickname)
                 ptr_nick = utf8_next_char (ptr_nick);
             }
             break;
+        case CONFIG_LOOK_NICK_COLOR_HASH_DJB2_32:
+            /* variant of djb2 hash (using 32-bit integer) */
+            color_32 = 5381;
+            while (ptr_nick && ptr_nick[0])
+            {
+                color_32 ^= (color_32 << 5) + (color_32 >> 2)
+                    + utf8_char_int (ptr_nick);
+                ptr_nick = utf8_next_char (ptr_nick);
+            }
+            color = color_32;
+            break;
+        case CONFIG_LOOK_NICK_COLOR_HASH_SUM_32:
+            /* sum of letters (using 32-bit integer) */
+            color_32 = 0;
+            while (ptr_nick && ptr_nick[0])
+            {
+                color_32 += utf8_char_int (ptr_nick);
+                ptr_nick = utf8_next_char (ptr_nick);
+            }
+            color = color_32;
+            break;
     }
 
     return (color % config_num_nick_colors);