Allow no argument to blankerprg.

Without any argument, blankerprg will show the command that would be
executed on 'blanker'. To unset, use an empty string, i.e.
"blankerprg ''".

3 files changed, 21 insertions, 3 deletions

diff --git a/src/doc/screen.1 b/src/doc/screen.1
index de3df24..bbf7975 100644
--- a/src/doc/screen.1
+++ b/src/doc/screen.1
@@ -1094,7 +1094,8 @@ This command is normally used together with the \*Qidle\*U command.
 .B blankerprg
 .RI [ "program args" ]
 .PP
-Defines a blanker program. Disables the blanker program if no
+Defines a blanker program. Disables the blanker program if an
+empty argument is given. Shows the currently set blanker program if no
 arguments are given.
 .sp
 .ne 3
diff --git a/src/doc/screen.texinfo b/src/doc/screen.texinfo
index 0bed653..618fa70 100644
--- a/src/doc/screen.texinfo
+++ b/src/doc/screen.texinfo
@@ -5155,8 +5155,10 @@ command.
 @end deffn
 
 @deffn Command blankerprg [@var{program args}]
-Defines a blanker program. Disables the blanker program if
-no arguments are given.
+Defines a blanker program. Disables the blanker program if an
+empty argument is given. Shows the currently set blanker program if no
+arguments are given.
+
 @end deffn
 
 @node Zmodem, , Screen Saver, Miscellaneous
diff --git a/src/process.c b/src/process.c
index 0e835f0..76785e1 100644
--- a/src/process.c
+++ b/src/process.c
@@ -4088,6 +4088,21 @@ int key;
       break;
 #ifdef BLANKER_PRG
     case RC_BLANKERPRG:
+      if (!args[0])
+	{
+	  if (blankerprg)
+	    {
+	      char path[MAXPATHLEN];
+	      char *p = path, **pp;
+	      for (pp = blankerprg; *pp; pp++)
+		p += snprintf(p, sizeof(path) - (p - path) - 1, "%s ", *pp);
+	      *(p - 1) = '\0';
+	      Msg(0, "blankerprg: %s", path);
+	    }
+	  else
+	    Msg(0, "No blankerprg set.");
+	  break;
+	}
       if (blankerprg)
 	{
 	  char **pp;