maint: use gnulib's standard --version-printing code

This includes author names and keeps the copyright year up to date.
* bootstrap.conf (gnulib_modules): Add propername and version-etc-fsf.
* src/main.c (AUTHORS): Define.
(main): Use version_etc, rather than hard-coding the copyright text.
Prompted by a patch from Paolo Bonzini.

2 files changed, 11 insertions, 9 deletions

diff --git a/bootstrap.conf b/bootstrap.conf
index 77870fe5..8edf429e 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -58,6 +58,7 @@ minmax
 obstack
 open
 progname
+propername
 quotearg
 realloc
 regex
@@ -76,6 +77,7 @@ unistd
 unlocked-io
 update-copyright
 useless-if-before-free
+version-etc-fsf
 wchar
 wcrtomb
 wctob
diff --git a/src/main.c b/src/main.c
index 53149128..6f5c4aea 100644
--- a/src/main.c
+++ b/src/main.c
@@ -43,7 +43,9 @@
 #include "intprops.h"
 #include "isdir.h"
 #include "progname.h"
+#include "propername.h"
 #include "savedir.h"
+#include "version-etc.h"
 #include "xalloc.h"
 #include "xstrtol.h"
 
@@ -53,6 +55,10 @@
 
 #define STREQ(a, b) (strcmp (a, b) == 0)
 
+#define AUTHORS \
+  proper_name ("Mike Haertel"), \
+  _("others, see <http://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>")
+
 struct stats
 {
   struct stats const *parent;
@@ -2156,15 +2162,9 @@ main (int argc, char **argv)
 
   if (show_version)
     {
-      printf ("%s\n\n", PACKAGE_STRING);
-      printf (_("\
-Copyright (C) %s Free Software Foundation, Inc.\n\
-License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n\
-This is free software: you are free to change and redistribute it.\n\
-There is NO WARRANTY, to the extent permitted by law.\n"),
-        "2009");
-      printf ("\n");
-      exit (EXIT_SUCCESS);
+      version_etc (stdout, program_name, PACKAGE_NAME, VERSION, AUTHORS, \
+                   (char *) NULL);					\
+      exit (EXIT_SUCCESS);						\
     }
 
   if (show_help)