xfer: contribute "light" theme overrides

Add xfer-theme.{c,h} with the xfer plugin contribution to the built-in
"light" theme: 7 overrides on xfer.color.* (status_aborted,
status_active, status_connecting, status_done, status_failed,
status_waiting, text_selected) tuned for a light-background terminal.

Same NULL-terminated 2D-array pattern as the irc, fset and buflist
contributions; xfer_theme_init() is called once from
weechat_plugin_init after xfer_config_init / xfer_config_read.

Default option values are NOT changed.

src/plugins/xfer/CMakeLists.txt

@@ -30,6 +30,7 @@ add_library(xfer MODULE
   xfer-file.c xfer-file.h
   xfer-info.c xfer-info.h
   xfer-network.c xfer-network.h
+  xfer-theme.c xfer-theme.h
   xfer-upgrade.c xfer-upgrade.h
 )
 set_target_properties(xfer PROPERTIES PREFIX "")

src/plugins/xfer/xfer-theme.c

@@ -0,0 +1,90 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Sébastien Helleu <flashcode@flashtux.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * This file is part of WeeChat, the extensible chat client.
+ *
+ * WeeChat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * WeeChat is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* xfer contribution to built-in themes. */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stddef.h>
+
+#include "../weechat-plugin.h"
+#include "xfer.h"
+#include "xfer-theme.h"
+
+
+/*
+ * xfer contribution to the "light" theme: option values tuned for a
+ * light-background terminal. Each row is { option_full_name, value };
+ * the table is NULL-terminated.
+ */
+
+const char *xfer_theme_light[][2] =
+{
+    { "xfer.color.status_aborted",    "red" },
+    { "xfer.color.status_active",     "blue" },
+    { "xfer.color.status_connecting", "202" },
+    { "xfer.color.status_done",       "green" },
+    { "xfer.color.status_failed",     "red" },
+    { "xfer.color.status_waiting",    "cyan" },
+    { "xfer.color.text_selected",     "default" },
+    { NULL,                           NULL },
+};
+
+/*
+ * Registers xfer's contribution to one theme from a NULL-terminated
+ * table of {option, value} rows.
+ */
+
+void
+xfer_theme_register (const char *name, const char *entries[][2])
+{
+    struct t_hashtable *overrides;
+    int i;
+
+    if (!name || !entries)
+        return;
+
+    overrides = weechat_hashtable_new (32,
+                                       WEECHAT_HASHTABLE_STRING,
+                                       WEECHAT_HASHTABLE_STRING,
+                                       NULL, NULL);
+    if (!overrides)
+        return;
+
+    for (i = 0; entries[i][0]; i++)
+        weechat_hashtable_set (overrides, entries[i][0], entries[i][1]);
+
+    weechat_theme_register (name, overrides);
+
+    weechat_hashtable_free (overrides);
+}
+
+/*
+ * Registers all built-in theme contributions from xfer.
+ */
+
+void
+xfer_theme_init (void)
+{
+    xfer_theme_register ("light", xfer_theme_light);
+}

src/plugins/xfer/xfer-theme.h

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Sébastien Helleu <flashcode@flashtux.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * This file is part of WeeChat, the extensible chat client.
+ *
+ * WeeChat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * WeeChat is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WEECHAT_PLUGIN_XFER_THEME_H
+#define WEECHAT_PLUGIN_XFER_THEME_H
+
+extern void xfer_theme_init (void);
+
+#endif /* WEECHAT_PLUGIN_XFER_THEME_H */

src/plugins/xfer/xfer.c

@@ -45,6 +45,7 @@
 #include "xfer-file.h"
 #include "xfer-info.h"
 #include "xfer-network.h"
+#include "xfer-theme.h"
 #include "xfer-upgrade.h"
 
 
@@ -1839,6 +1840,8 @@ weechat_plugin_init (struct t_weechat_plugin *plugin, int argc, char *argv[])
 
     xfer_config_read ();
 
+    xfer_theme_init ();
+
     xfer_create_directories ();
 
     xfer_command_init ();