[PATCH 15/16] test/dup_field.c: Add help text.

* test/dup_field.c: Add new global WINDOW pointer `win_help`.
  (rip_help): New function stores the WINDOW pointer for the help window
  created by initscr(3).
  (configure_help): New function populates the help window.
  (main): Call ripoffline(3) to reserve a help window.  Once curses and
  color pairs are set up, call `configure_help()`.

All of these changes are preprocessor-conditionalized on
`HAVE_RIPOFFLINE`.
---
 test/dup_field.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/test/dup_field.c b/test/dup_field.c
index 2672339db..35dd2d476 100644
--- a/test/dup_field.c
+++ b/test/dup_field.c
@@ -48,6 +48,9 @@ static FIELD *all_fields[MAX_FIELDS];
 static bool is_editing[MAX_FIELDS];
 static bool was_copied[MAX_FIELDS];
 static unsigned num_fields;
+#if HAVE_RIPOFFLINE
+WINDOW *win_help = NULL;
+#endif
 static FIELD **last_list;
 /* *INDENT-OFF* */
 static struct {
@@ -447,6 +450,38 @@ usage(int ok)
 VERSION_COMMON()
 /* *INDENT-ON* */
 
+#if HAVE_RIPOFFLINE
+static int
+rip_help(WINDOW *win, int cols)
+{
+    win_help = win;
+    return OK;
+}
+
+/*
+ * We can't do this stuff in rip_help() because colors aren't yet set up
+ * when initscr() calls it.
+ */
+static void
+configure_help(WINDOW *win)
+{
+    const size_t bufsz = 512; /* maximum # columns ncurses supports */
+    char buf[bufsz];
+
+    memset(buf, 0, bufsz);
+    (void) snprintf(buf, bufsz,
+		    "Press F1 for help, %s to duplicate field,"
+		    " or ^Q to quit.",
+		    keyname(DO_DEMO));
+    wbkgd(win, (chtype) COLOR_PAIR(1));
+    werase(win);
+    wmove(win, 0, 0);
+    wprintw(win, buf);
+    wnoutrefresh(win);
+    return;
+}
+#endif
+
 int
 main(int argc, char *argv[])
 {
@@ -464,6 +499,9 @@ main(int argc, char *argv[])
 
     setlocale(LC_ALL, "");
 
+#if HAVE_RIPOFFLINE
+    ripoffline(-1, rip_help);
+#endif
     initscr();
     cbreak();
     noecho();
@@ -481,6 +519,9 @@ main(int argc, char *argv[])
 	refresh();
     }
 
+#if HAVE_RIPOFFLINE
+    configure_help(win_help);
+#endif
     demo_forms();
 
     endwin();
-- 
2.30.2

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