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diff --git a/lib/bsddialog_theme.h b/lib/bsddialog_theme.h
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+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Alfonso Sabato Siciliano
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _LIBBSDDIALOG_THEME_H_
+#define _LIBBSDDIALOG_THEME_H_
+
+enum bsddialog_color {
+	BSDDIALOG_BLACK = 0,
+	BSDDIALOG_RED,
+	BSDDIALOG_GREEN,
+	BSDDIALOG_YELLOW,
+	BSDDIALOG_BLUE,
+	BSDDIALOG_MAGENTA,
+	BSDDIALOG_CYAN,
+	BSDDIALOG_WHITE,
+};
+
+struct bsddialog_theme {
+	int shadowcolor;
+	unsigned int shadowrows;
+	unsigned int shadowcols;
+
+	int backgroundcolor;
+	bool surroundtitle;
+	int titlecolor;
+	int lineraisecolor;
+	int linelowercolor;
+	int widgetcolor;
+
+	unsigned int texthmargin;
+
+	int curritemcolor;
+	int itemcolor;
+	int currtagcolor;
+	int tagcolor;
+	int namesepcolor;
+	int descsepcolor;
+
+	int currfieldcolor;
+	int fieldcolor;
+	int fieldreadonlycolor;
+
+	int currbarcolor;
+	int barcolor;
+
+	unsigned int buttonspace;
+	int buttleftch;
+	int buttrightchar;
+	int currbuttdelimcolor;
+	int buttdelimcolor;
+	int currbuttoncolor;
+	int buttoncolor;
+	int currshortkeycolor;
+	int shortkeycolor;
+
+	int bottomtitlecolor;
+};
+
+enum bsddialog_default_theme {
+	BSDDIALOG_THEME_BLACKWHITE,
+	BSDDIALOG_THEME_BSDDIALOG,
+	BSDDIALOG_THEME_DEFAULT,
+	BSDDIALOG_THEME_DIALOG,
+	BSDDIALOG_THEME_MAGENTA,
+};
+
+int bsddialog_color(enum bsddialog_color background, enum bsddialog_color foreground);
+struct bsddialog_theme bsddialog_get_theme();
+void bsddialog_set_theme(struct bsddialog_theme theme);
+int bsddialog_set_default_theme(enum bsddialog_default_theme theme);
+
+#endif