irc: compute color in case insensitive way (closes #194)

Reintroduce infos "irc_nick_color" and "irc_nick_color_name" (that were
marked deprecated since version 1.5).

A server name is added in the two infos and is optional, for backward
compatibility.

ChangeLog.adoc

@@ -22,6 +22,7 @@ New features::
   * buflist: increase max number of buflist items from 3 to 5 (issue #1703)
   * fset: add variable `allowed_values` in options, add options fset.color.allowed_values and fset.color.allowed_values_selected
   * fset: allow long type name in type filter
+  * irc: compute color in case insensitive way, reintroduce infos "irc_nick_color" and "irc_nick_color_name", add support of server name (issue #194)
   * irc: add buffer for /list reply, add options irc.color.list_buffer_line_selected, irc.color.list_buffer_line_selected_bg, irc.look.list_buffer_sort, irc.look.list_buffer_scroll_horizontal, irc.look.new_list_position, irc.look.list_buffer_topic_strip_colors (issue #1972)
   * irc: display commands 716/717 in private buffer (if present) (issue #146)
   * irc: create default options irc.ctcp.* when file irc.conf is created (issue #1974)

ReleaseNotes.adoc

@@ -59,6 +59,36 @@ back with the two following commands:
 They will then be advertised in reply to "CTCP CLIENTINFO", which is now built
 dynamically with these options.
 
+[[v4.1.0_info_irc_nick_color]]
+=== Infos irc_nick_color and irc_nick_color_name
+
+The infos irc_nick_color and irc_nick_color_name, that were deprecated since
+version 1.5 are now used again, with a change in parameter: the server is now
+optional before the nick: "server,nick". +
+The nick is first converted to lower case, following the value of CASEMAPPING
+on the server, then hashed to compute the color. +
+That means the color for a nick is now case insensitive (in the way IRC servers
+are case insensitive, so with a limited range of chars only).
+
+If a script was using this info with a comma in nickname (which should not happen
+anyway), this is now interpreted as the server name, and the script must be
+modified. +
+Anyway, it is recommended to always give the server name to respect the
+CASEMAPPING of the server and prevent any issue with a comma in the nickname.
+
+For example nick color of "alice" and "ALICE" is now always guaranteed to be the
+same:
+
+----
+# with server name (recommended)
+weechat.info_get("irc_nick_color", "libera,alice") == weechat.info_get("irc_nick_color", "libera,ALICE")
+weechat.info_get("irc_nick_color_name", "libera,alice") == weechat.info_get("irc_nick_color_name", "libera,ALICE")
+
+# without server name (allowed but not recommended, kept for compatibility)
+weechat.info_get("irc_nick_color", "alice") == weechat.info_get("irc_nick_color", "ALICE")
+weechat.info_get("irc_nick_color_name", "alice") == weechat.info_get("irc_nick_color_name", "ALICE")
+----
+
 [[v4.1.0_fset_allowed_values]]
 === Allowed values for options on fset buffer
 

po/cs.po

@@ -21,7 +21,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: WeeChat\n"
 "Report-Msgid-Bugs-To: flashcode@flashtux.org\n"
-"POT-Creation-Date: 2023-08-22 09:26+0200\n"
+"POT-Creation-Date: 2023-08-24 09:00+0200\n"
 "PO-Revision-Date: 2023-06-26 21:34+0200\n"
 "Last-Translator: Ondřej Súkup <mimi.vx@gmail.com>\n"
 "Language-Team: weechat-dev <weechat-dev@nongnu.org>\n"
@@ -9689,16 +9689,15 @@ msgid "IRC host (like `:nick!name@server.com`)"
 msgstr "IRC host (jako `:nick!name@server.com`)"
 
 msgid ""
-"get nick color code (*deprecated* since version 1.5, replaced by "
-"\"nick_color\")"
+"get nick color code (nick is first converted to lower case, following the "
+"value of CASEMAPPING on the server, defaulting to \"rfc1459\" if the server "
+"is not given)"
 msgstr ""
 
-msgid "nickname"
-msgstr "přezdívka"
-
 msgid ""
-"get nick color name (*deprecated* since version 1.5, replaced by "
-"\"nick_color_name\")"
+"get nick color name (nick is first converted to lower case, following the "
+"value of CASEMAPPING on the server, defaulting to \"rfc1459\" if the server "
+"is not given)"
 msgstr ""
 
 msgid "get buffer pointer for an IRC server/channel/nick"
@@ -14318,6 +14317,9 @@ msgstr "%s%s: vypršel časový limit \"%s\" pro %s"
 msgid "%s%s: unable to connect: unexpected error (%d)"
 msgstr "%s%s: nemohu se připojit\" neočekávaná chyba (%d)"
 
+#~ msgid "nickname"
+#~ msgstr "přezdívka"
+
 #, fuzzy
 #~ msgid "color for selected line"
 #~ msgstr "sekce konfigu"