freebsd-dev/contrib/bsddialog/lib/bsddialog.3

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.Dd September 23, 2022
.Dt BSDDIALOG 3
.Os
.Sh NAME
.Nm bsddialog_backtitle ,
.Nm bsddialog_calendar ,
.Nm bsddialog_clearterminal ,
.Nm bsddialog_color ,
.Nm bsddialog_color_attrs ,
.Nm bsddialog_checklist ,
.Nm bsddialog_datebox ,
.Nm bsddialog_end ,
.Nm bsddialog_form ,
.Nm bsddialog_gauge ,
.Nm bsddialog_geterror ,
.Nm bsddialog_get_theme ,
.Nm bsddialog_hascolors ,
.Nm bsddialog_infobox ,
.Nm bsddialog_init ,
.Nm bsddialog_init_notheme ,
.Nm bsddialog_initconf ,
.Nm bsddialog_menu ,
.Nm bsddialog_mixedgauge ,
.Nm bsddialog_mixedlist ,
.Nm bsddialog_msgbox ,
.Nm bsddialog_pause ,
.Nm bsddialog_radiolist ,
.Nm bsddialog_rangebox ,
.Nm bsddialog_set_theme ,
.Nm bsddialog_set_default_theme ,
.Nm bsddialog_textbox ,
.Nm bsddialog_timebox ,
.Nm bsddialog_yesno
.Nd TUI dialogs
.Sh LIBRARY
.Lb libbsddialog
.Sh SYNOPSIS
.In bsddialog.h
.Ft int
.Fn bsddialog_backtitle "struct bsddialog_conf *conf" "const char *backtitle"
.Ft int
.Fo bsddialog_calendar
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int *yy"
.Fa "unsigned int *mm"
.Fa "unsigned int *dd"
.Fc
.Ft int
.Fo bsddialog_checklist
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int menurows"
.Fa "unsigned int nitems"
.Fa "struct bsddialog_menuitem *items"
.Fa "int *focusitem"
.Fc
.Ft int
.Fn bsddialog_clearterminal "void"
.Ft int
.Fo bsddialog_datebox
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int *yy"
.Fa "unsigned int *mm"
.Fa "unsigned int *dd"
.Fc
.Ft int
.Fn bsddialog_end "void"
.Ft int
.Fo bsddialog_form
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int formrows"
.Fa "unsigned int nitems"
.Fa "struct bsddialog_formitem *items"
.Fc
.Ft int
.Fo bsddialog_gauge
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int perc"
.Fa "int fd"
.Fa "const char *sep"
.Fc
.Ft const char *
.Fn bsddialog_geterror "void"
.Ft int
.Fo bsddialog_infobox
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fc
.Ft int
.Fn bsddialog_init "void"
.Ft int
.Fn bsddialog_init_notheme "void"
.Ft int
.Fn bsddialog_initconf "struct bsddialog_conf *conf"
.Ft int
.Fo bsddialog_menu
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int menurows"
.Fa "unsigned int nitems"
.Fa "struct bsddialog_menuitem *items"
.Fa "int *focusitem"
.Fc
.Ft int
.Fo bsddialog_mixedgauge
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int mainperc"
.Fa "unsigned int nminibars"
.Fa "char **minilabels"
.Fa "int *minipercs"
.Fc
.Ft int
.Fo bsddialog_mixedlist
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int menurows"
.Fa "unsigned int ngroups"
.Fa "struct bsddialog_menugroup *groups"
.Fa "int *focuslist"
.Fa "int *focusitem"
.Fc
.Ft int
.Fo bsddialog_msgbox
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fc
.Ft int
.Fo bsddialog_pause
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int seconds"
.Fc
.Ft int
.Fo bsddialog_radiolist
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int menurows"
.Fa "unsigned int nitems"
.Fa "struct bsddialog_menuitem *items"
.Fa "int *focusitem"
.Fc
.Ft int
.Fo bsddialog_rangebox
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "int min"
.Fa "int max"
.Fa "int *value"
.Fc
.Ft int
.Fo bsddialog_textbox
.Fa "struct bsddialog_conf *conf"
.Fa "const char *file"
.Fa "int rows"
.Fa "int cols"
.Fc
.Ft int
.Fo bsddialog_timebox
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fa "unsigned int *hh"
.Fa "unsigned int *mm"
.Fa "unsigned int *ss"
.Fc
.Ft int
.Fo bsddialog_yesno
.Fa "struct bsddialog_conf *conf"
.Fa "const char *text"
.Fa "int rows"
.Fa "int cols"
.Fc
.In bsddialog_theme.h
.Ft int
.Fo bsddialog_color
.Fa "enum bsddialog_color foreground"
.Fa "enum bsddialog_color background"
.Fa "unsigned int flags"
.Fc
.Ft int
.Fo bsddialog_color_attrs
.Fa "int color"
.Fa "enum bsddialog_color *foreground"
.Fa "enum bsddialog_color *background"
.Fa "unsigned int *flags"
.Fc
.Ft int
.Fn bsddialog_get_theme "struct bsddialog_theme *theme"
.Ft bool
.Fn bsddialog_hascolors "void"
.Ft int
.Fn bsddialog_set_default_theme "enum bsddialog_default_theme theme"
.Ft int
.Fn bsddialog_set_theme "struct bsddialog_theme *theme"
.Sh DESCRIPTION
The
.Nm bsddialog
library provides an API to build Text User Interface dialogs and widgets: to
display messages, to get input and to inform about a computation status.
.Pp
.Fn bsddialog_init
initializes the library, the only functions that can be called before is
.Fn bsddialog_initconf
described later.
After the initialization the input and output should be handled via the library
API.
.Fn bsddialog_end
restores the screen like before
.Fn bsddialog_init ,
then it is not possible to use the library functions.
.Fn bsddialog_init_notheme
is equivalent to
.Fn bsddialog_init
except it does not set the default graphical theme; see
.Sx Theme
subsection to set a theme explicitly.
.Pp
.Fn bsddialog_error
returns a string to describe the last error, it should be called after a
.Dv BSDDIALOG_ERROR
returned value.
.Fn bsddialog_clearterminal
clears the screen.
.Fn bsddialog_backtitle
prints
.Fa backtitle
on the top of the screen, it is possible to set
.Fa conf.ascii_lines
and
.Fa conf.no_lines ;
.Fa conf
is described later.
.Pp
Each
.Fa char*
argument has to be a well terminated string, it can be a multibyte character
string depending on current locale, see
.Xr setlocale 3 .
.Ss Dialogs
The dialogs have common arguments.
.Fa text
is a string printed inside the dialog.
.Fa rows
and
.Fa cols
are height and width, their value can be between 2 and the screen size,
.Dv BSDDIALOG_AUTOSIZE
or
.Dv BSDDIALOG_FULLSCREEN .
.Fa conf
is a struct to customize the dialog, it does not set global properties to the
library.
.Pp
.Bd -literal -offset indent -compact
struct bsddialog_conf {
	bool ascii_lines;
	unsigned int auto_minheight;
	unsigned int auto_minwidth;
	unsigned int auto_topmargin;
	unsigned int auto_downmargin;
	const char *bottomtitle;
	bool clear;
	int *get_height;
	int *get_width;
	bool no_lines;
	bool shadow;
	unsigned int sleep;
	const char *title;
	int y;
	int x;
	struct {
		bool enable_esc;
		const char *f1_file;
		const char *f1_message;
	} key;
	struct {
		unsigned int cols_per_row;
		bool highlight;
		unsigned int tablen;
	} text;
	struct {
		bool align_left;
		bool no_desc;
		bool no_name;
		bool on_without_ok;
		bool shortcut_buttons;
	} menu;
	struct {
		char securech;
		char *securembch;
		bool value_wchar;
		bool value_without_ok;
	} form;
	struct {
		bool always_active;
		bool without_ok;
		const char *ok_label;
		bool with_extra;
		const char *extra_label;
		bool without_cancel;
		const char *cancel_label;
		bool default_cancel;
		bool with_help;
		const char *help_label;
		const char *generic1_label;
		const char *generic2_label;
		const char *default_label;
	} button;
};
.Ed
.Pp
.Bl -column -compact
.It Fa conf.ascii_lines
ascii characters to draw lines, default wide characters.
.It Fa conf.auto_minheight
minimum height if
.Fa rows
is
.Dv BSDDIALOG_AUTOSIZE .
.It Fa conf.auto_minwidth
minimum width if
.Fa cols
is
.Dv BSDDIALOG_AUTOSIZE .
.It Fa conf.auto_topmargin
top margin if
.Fa rows
is
.Dv BSDDIALOG_AUTOSIZE
or
.Dv BSDDIALOG_FULLSCREEN ,
.Fa conf.y
has to be
.Dv BSDDIALOG_CENTER .
.It Fa conf.auto_downmargin
down margin if
.Fa rows
is
.Dv BSDDIALOG_AUTOSIZE
or
.Dv BSDDIALOG_FULLSCREEN .
.It Fa conf.bottomtitle
subtitle at the dialog bottom side.
.It Fa conf.clear
hide the dialog at exit.
.It Fa conf.get_height
if not
.Dv NULL
is set like the dialog height.
.It Fa conf.get_width
if not
.Dv NULL
is set like the dialog width.
.It Fa conf.no_lines
not draw lines.
.It Fa conf.shadow
draw shadow.
.It Fa conf.sleep
wait before to return, the value is in seconds.
.It Fa conf.title
title at the top dialog side.
.It Fa conf.y
vertical position, 0 is top screen size, can be
.Dv BSDDIALOG_CENTER .
.It Fa conf.x
horizontal position, 0 is left screen side, can be
.Dv BSDDIALOG_CENTER .
.El
.Pp
.Bl -column -compact
.It Fa conf.key.enable_esc
enables
.Dv ESC
key to close the dialog.
.It Fa conf.key.f1_file
file to open if F1 is pressed.
.It Fa conf.key.f1_message
message to display if F1 is pressed.
.El
.Pp
.Bl -column -compact
.It Fa conf.text.cols_per_row
Try to set the number of columns for a row of
.Fa text
with autosizing; default
.Dv 10 .
.It Fa conf.text.highlight
enables highlights for
.Fa text ,
properly the following sequences are considered escapes:
.It Dq \eZ0
black.
.It Dq \eZ1
red.
.It Dq \eZ2
green.
.It Dq \eZ3
yellow.
.It Dq \eZ4
blue.
.It Dq \eZ5
magenta.
.It Dq \eZ6
cyan.
.It Dq \eZ7
white.
.It Dq \eZr
reverse foreground and background.
.It Dq \eZR
disable reverse.
.It Dq \eZb
bold.
.It Dq \eZB
disable bold.
.It Dq \eZu
underline.
.It Dq \eZU
disable underline.
.It Dq \eZn
disable each customization.
.It Fa conf.text.tablen
tab length for
.Fa text
argument and
.Fn bsddialog_textbox
function.
.El
.Pp
.Bl -column -compact
.It Fa conf.button.always_active
buttons always active, avoidind focus switch between buttons and input fields or
input boxes in
.Fn bsddialog_form ,
.Fn bsddialog_datebox ,
.Fn bsddialog_calendar
and
.Fn bsddialog_timebox .
.It Fa conf.button.without_ok
disable OK button.
.It Fa conf.button.ok_label
set label for OK button.
.It Fa conf.button.with_extra
add Extra button.
.It Fa conf.button.extra_label
set a label for Extra button.
.It Fa conf.button.without_cancel
disable Cancel button.
.It Fa conf.button.cancel_label
sets a label for Cancel button.
.It Fa conf.button.default_cancel
on startup focus on the Cancel button.
.It Fa conf.button.with_help
add Help button.
.It Fa conf.button.help_label
set a label for Help button.
.It Fa conf.button.generic1_label
add a button with the specified label.
.It Fa conf.button.generic2_label
add a button with the specified label.
.It Fa conf.button.default_label
focus on the button with the specified label.
.El
.Pp
.Fn bsddialog_initconf
initializes
.Fa conf
disabling each property, except
.Fa conf.shadow
to true,
.Fa conf.y
and
.Fa conf.x
to
.Dv BSDDIALOG_CENTER ,
.Fa conf.text.cols_per_row
to
.Dv 10 .
.Pp
.Fn bsddialog_infobox
builds a dialog without buttons and returns instantly.
.Fn bsddialog_msgbox
builds a dialog with OK button.
.Fn bsddialog_yesno
provides a dialog for a
.Dq Yes-No Question ,
the labels on buttons are Yes and No.
.Pp
.Fn bsddialog_pause
builds a dialog waiting until the timeout in
.Fa seconds
expires or a button is pressed.
.Pp
.Fn bsddialog_calendar
and
.Fn bsddialog_datebox
build a dialog to select a date,
.Fa yy ,
.Fa mm ,
and
.Fa dd
are default values on startup, selected date at exit.
.Fn bsddialog_timebox
builds a dialog to choose a time,
.Fa hh ,
.Fa mm ,
and
.Fa ss
are default values on startup, selected time at exit.
.Pp
.Fn bsddialog_checklist ,
.Fn bsddialog_menu
and
.Fn bsddialog_radiolist
build dialogs to select some item from a list via the SPACE key, an item is
defined like:
.Pp
.Bd -literal -offset indent -compact
struct bsddialog_menuitem {
	const char *prefix;
	bool on;
	unsigned int depth;
	const char *name;
	const char *desc;
	const char *bottomdesc;
};
.Ed
.Pp
.Fa prefix ,
.Fa name
and
.Fa desc
are strings to describe the item and are printed on its row,
.Fa bottomdesc
is printed on the bottom side of the screen,
.Fa depth
is a margin between the
.Fa prefix
and
.Fa name
useful to implement a
.Dq treeview,
.Fa on
is set to
.Dv true
if the item is selected,
.Dv false
otherwise.
.Fa items
is an array of items of
.Fa nitem
elements,
.Fa menurows
specifies the graphical fixed height of the list, if
.Fa cols
is set to
.Dv BSDDIALOG_AUTOSIZE
.Fa menurows
specifies a maximum value.
Finally, if not
.Dv NULL ,
.Fa focusitem
specifies the default item on startup and the last focused item at exit, could
be a negative value if no item is focused.
.Pp
.Fn bsddialog_mixedlist
builds a dialog with collections of checklists, radiolists and separators.
A collection is a set defined like:
.Pp
.Bd -literal -offset indent -compact
enum bsddialog_menutype {
	BSDDIALOG_CHECKLIST,
	BSDDIALOG_RADIOLIST,
	BSDDIALOG_SEPARATOR,
};

struct bsddialog_menugroup {
	enum bsddialog_menutype type;
	unsigned int nitems;
	struct bsddialog_menuitem *items;
};
.Ed
.Pp
.Fa groups
is an array of sets of
.Fa ngroups
elements.
.Fa menurows
is the graphical height size for the list.
If not
.Dv NULL ,
.Fa focuslist
and
.Fa focusitem
specify the default item on startup and the last focused item at exit, could be
a negative value if no item is focused.
.Pp
.Fn bsddialog_checklist ,
.Fn bsddialog_menu ,
.Fn bsddialog_mixedlist
and
.Fn bsddialog_radiolist
can be costomizated by:
.Bl -column -compact
.It Fa conf.menu.align_left
aligns items to left, default center.
.It Fa conf.menu.no_desc
hide description.
.It Fa conf.menu.no_name
hide names.
.It Fa conf.menu.on_without_ok
set items
.Fa on
also if the OK button is not pressed.
.It Fa conf.menu.shortcut_buttons
enable shortcut keys on buttons, default on items.
.El
.Pp
.Fn bsddialog_form
builds a dialog to display an array of
.Fa items
of
.Fa nitems
elements to get strings in input.
.Fa formrows
specifies the graphical height for the box around the items,
.Dv 0
for autosizing.
An item is defined like:
.Pp
.Bd -literal -offset indent -compact
struct bsddialog_formitem {
	const char *label;
	unsigned int ylabel;
	unsigned int xlabel;

	const char *init;
	unsigned int yfield;
	unsigned int xfield;
	unsigned int fieldlen;
	unsigned int maxvaluelen;
	char *value;

	unsigned int flags;

	const char *bottomdesc;
};
.Ed
.Pp
.Fa label
is a string to describe the request, it is printed at the position
.Fa ylabel
and
.Fa xlabel .
The field for the input is at the position
.Fa yfield
and
.Fa xfield ,
.Fa fieldlen
is its graphical width, while
.Fa maxvalelen
is the maximum number of characters of the input string.
.Fa init
is the default field value.
If the OK button is pressed
.Fa value
is the allocated memory with the current field string, its size depends on
the current locale.
.Fa flags
is an OR value to set the
.Dv BSDDIALOG_FIELDHIDDEN ,
.Dv BSDDIALOG_FIELDREADONLY ,
.Dv BSDDIALOG_FIELDNOCOLOR ,
.Dv BSDDIALOG_FIELDCURSOREND ,
.Dv BSDDIALOG_FIELDEXTEND
and
.Dv BSDDIALOG_FIELDSINGLEBYTE .
flags for the field.
.Fa bottomdesc
is printed on the bottom side of the screen if the item is focused.
.Pp
.Fn bsddialog_form
can be customized by:
.Bl -column -compact
.It Fa conf.form.securech
charachter to hide the input with
.Dv BSDDIALOG_FIELDHIDDEN .
.It Fa conf.form.securembch
multibyte charachter to hide the input with
.Dv BSDDIALOG_FIELDHIDDEN ,
.Fa conf.form.securech
is ignored.
.It Fa conf.form.value_wchar
the allocated
.Fa value
is a
.Em wchar_t*
string.
.It Fa conf.form.value_without_ok
allocate memory and set
.Fa value
also if the OK button is not pressed.
.El
.Pp
.Fn bsddialog_gauge
builds a dialog with a bar to shows
.Fa perc ,
if the file descriptor
.Fa fd
is greater or equal to 0 the dialog waits to read
.Fa separator
from it, then the first string replaces
.Fa perc
and the following strings replace
.Fa text
until the next
.Fa separator ,
the loop ends reading
.Dv EOF .
.Pp
.Fn bsddialog_mixedgauge
draws a main bar with the
.Fa mainperc
percentage and
.Fa nminibars
each one with a
.Fa minilabel
and a
.Fa miniperc
with a value between 0 and 100 or
.Dv BSDDIALOG_MG_SUCCEEDED ,
.Dv BSDDIALOG_MG_FAILED ,
.Dv BSDDIALOG_MG_PASSED ,
.Dv BSDDIALOG_MG_COMPLETED ,
.Dv BSDDIALOG_MG_CHECKED ,
.Dv BSDDIALOG_MG_DONE ,
.Dv BSDDIALOG_MG_SKIPPED ,
.Dv BSDDIALOG_MG_INPROGRESS ,
.Dv BSDDIALOG_MG_BLANK ,
.Dv BSDDIALOG_MG_NA
or
.Dv BSDDIALOG_MG_PENDING
to print a descriptive string.
.Pp
.Fn bsddialog_rangebox
to select a value between
.Fa min
and
.Fa max .
.Fa value
is the default value on startup and the selected value at exit.
The current value is printed inside a bar, the keys UP, DOWN, HOME, END, PAGEUP
and PAGEDOWN can change it.
.Pp
.Fn bsddialog_textbox
opens and prints
.Fa file
in a dialog, the UP, DOWN, HOME, END, PAGEUP and PAGEDOWN keys are availble to
navigate the file.
OK button is renamed EXIT.
.Ss Theme
The graphical properties are global to the library, they are represented by
.Fa struct bsddialog_theme
and can be customized at runtime via the
.In bsddialog_theme.h
API.
.Pp
.Bd -literal -offset indent -compact
struct bsddialog_theme {
	struct {
		int color;
	} screen;
	struct {
		int color;
		unsigned int y;
		unsigned int x;
	} shadow;
	struct {
		int  color;
		bool delimtitle;
		int  titlecolor;
		int  lineraisecolor;
		int  linelowercolor;
		int  bottomtitlecolor;
		int  arrowcolor;
	} dialog;
	struct {
		int f_selectorcolor;
		int selectorcolor;
		int f_namecolor;
		int namecolor;
		int f_desccolor;
		int desccolor;
		int namesepcolor;
		int descsepcolor;
		int f_shortcutcolor;
		int shortcutcolor;
		int bottomdesccolor;
	} menu;
	struct {
		int f_fieldcolor;
		int fieldcolor;
		int readonlycolor;
		int bottomdesccolor;
	} form;
	struct {
		int f_color;
		int color;
	} bar;
	struct {
		unsigned int minmargin;
		unsigned int maxmargin;
		char leftdelim;
		char rightdelim;
		int delimcolor;
		int f_delimcolor;
		int color;
		int f_color;
		int shortcutcolor;
		int f_shortcutcolor;
	} button;
};
.Ed
.Pp
A member with the
.Dq f_
prefix refers to an element with focus.
.Pp
.Fn bsddialog_get_theme
sets
.Fa theme
like the current theme.
.Pp
A color can be set by the value returned by
.Fn bsddialog_color ,
Possible values for
.Fa background
and
.Fa foreground
are:
.Dv BSDDIALOG_BLACK ,
.Dv BSDDIALOG_RED ,
.Dv BSDDIALOG_GREEN ,
.Dv BSDDIALOG_YELLOW ,
.Dv BSDDIALOG_BLUE ,
.Dv BSDDIALOG_MAGENTA ,
.Dv BSDDIALOG_CYAN ,
and
.Dv BSDDIALOG_WHITE ,
.Fa flags
specifies OR-flags, possible values:
.Dv BSDDIALOG_BOLD ,
.Dv BSDDIALOG_REVERSE
and
.Dv BSDDIALOG_UNDERLINE .
.Fn bsddialog_color_attrs
gets the properties of a color.
.Pp
.Fn bsddialog_set_theme
sets
.Fa theme
like current theme, the changes takes effect only for dialogs built after the
call.
.Pp
The library provides predefined themes:
.Dv BSDDIALOG_THEME_BLACKWHITE ,
.Dv BSDDIALOG_THEME_BSDDIALOG ,
.Dv BSDDIALOG_THEME_FLAT
and
.Dv BSDDIALOG_THEME_DIALOG ,
they can be set via
.Fn bsddialog_set_default_theme .
.Pp
.Fn bsddialog_hascolors
returns
.Dv true
if the terminal provides colors,
.Dv false
otherwise.
.Sh RETURN VALUES
The functions return the value
.Dv BSDDIALOG_ERROR
if unsuccessful;
otherwise, depending on the pressed button, the following values can be
returned:
.Dv BSDDIALOG_OK ,
.Dv BSDDIALOG_CANCEL ,
.Dv BSDDIALOG_HELP ,
.Dv BSDDIALOG_EXTRA ,
.Dv BSDDIALOG_GENERIC1
or
.Dv BSDDIALOG_GENERIC2 .
.Dv BSDDIALOG_YES
and
.Dv BSDDIALOG_NO
are aliases for
.Dv BSDDIALOG_OK
and
.Dv BSDDIALOG_CANCEL ,
respectively.
.Pp
The functions return
.Dv BSDDIALOG_ESC
if
.Fa conf.key.enable_esc
is enabled and the ESC key is pressed.
.Pp
.Fn bsddialog_pause
returns
.Dv BSDDIALOG_TIMEOUT
if the timeout expires.
.Sh EXAMPLES
.Dq Yes-No Question
Example:
.Pp
.Bd -literal -offset indent -compact
int output;
struct bsddialog_conf conf;

if (bsddialog_init() == BSDDIALOG_ERROR)
	return (1);

bsddialog_initconf(&conf);
conf.title = "yesno";
output = bsddialog_yesno(&conf, "Example", 7, 25);

bsddialog_end();

switch (output) {
case BSDDIALOG_YES:
	printf("Yes\\n");
	break;
case BSDDIALOG_NO
	printf("NO\\n");
	break;
case BSDDIALOG_ERROR:
	printf("Error: %s\\n", bsddialog_geterror());
}
.Ed
.Pp
Theme Example:
.Pp
.Bd -literal -offset indent -compact
struct bsddialog_conf conf;
struct bsddialog_theme theme;

bsddialog_init();

bsddialog_initconf(&conf);
bsddialog_msgbox(&conf, "Default theme", 7, 25);

bsddialog_get_theme(&theme);
theme.screen.color = bsddialog_color(BSDDIALOG_RED, BSDDIALOG_GREEN,
    BSDDIALOG_BOLD);
bsddialog_set_theme(&theme);
bsddialog_backtitle(&conf, "Red foreground and Green background");
bsddialog_msgbox(&conf, "Change screen color", 7, 25);

bsddialog_set_default_theme(BSDDIALOG_THEME_BLACKWHITE);
bsddialog_msgbox(&conf, "Black and White theme", 7, 25);

bsddialog_end();
.Ed
.Pp
Mixedlist Example:
.Pp
.Bd -literal -offset indent -compact
unsigned int i, j;
struct bsddialog_conf conf;
struct bsddialog_menuitem item;
struct bsddialog_menuitem check[2] = {
    { "1", true,  0, "Name 1", "Desc 1", "Check Bottom Desc 1" },
    { "2", false, 0, "Name 2", "Desc 2", "Check Bottom Desc 2" }
};
struct bsddialog_menuitem sep[1] = {
    { "3", true, 0, "Radiolist", "(desc)", "" }
};
struct bsddialog_menuitem radio[2] = {
    { "4", true,  0, "Name 1", "Desc 1", "Radio Bottom Desc 1" },
    { "5", false, 0, "Name 2", "Desc 2", "Radio Bottom Desc 2" }
};
struct bsddialog_menugroup group[3] = {
    { BSDDIALOG_CHECKLIST, 2, check },
    { BSDDIALOG_SEPARATOR, 1, sep   },
    { BSDDIALOG_RADIOLIST, 2, radio }
};

bsddialog_init();
bsddialog_initconf(&conf);
bsddialog_mixedlist(&conf, "Example", 20, 30, 11, 3, group, NULL,
    NULL);
bsddialog_end();

for (i = 0; i < 3; i++) {
	for (j = 0; j < group[i].nitems; j++) {
		item = group[i].items[j];
		switch (item.type) {
		case BSDDIALOG_SEPARATOR:
			printf("---- %s ----\\n", item.name);
			break;
		case BSDDIALOG_RADIOLIST:
			printf(" (%c) %s\\n",
			    item.on ? '*' : ' ', item.name);
			break;
		case BSDDIALOG_CHECKLIST:
			printf(" [%c] %s\\n",
			    item.on ? 'X' : ' ', item.name);
			break;
		}
	}
}
.Ed
.Sh SEE ALSO
.Xr bsddialog 1 ,
.Xr curses 3
.Sh HISTORY
The
.Nm bsddialog
library first appeared in
.Fx 14.0 .
.Sh AUTHORS
.Nm bsddialog
was written by
.An Alfonso Sabato Siciliano Aq Mt asiciliano@FreeBSD.org .