gnulib, autoconf: update.

[bison.git] / build-aux / update-b4-copyright

diff --git a/build-aux/update-b4-copyright b/build-aux/update-b4-copyright
index 06d3cb76da896cc35aa14f5419c8d1a1241280dd..4a614241a85a693325f3a290fa7311f1d6847c31 100755 (executable)
--- a/build-aux/update-b4-copyright
+++ b/build-aux/update-b4-copyright
@@ -3,8 +3,8 @@
 # Update b4_copyright invocations or b4_copyright_years definitions to
 # include the current year.
 
-# Copyright (C) 2009 Free Software Foundation, Inc.
-#
+# Copyright (C) 2009-2011 Free Software Foundation, Inc.
+
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3, or (at your option)
@@ -42,7 +42,7 @@ my $old_re = <<'EOF'
   (?:
     ,\s*
     (
-      \[\s* (?:\d{4}(,\s*|-))* (\d{4}) \s*]
+      \[\s* (?:\d{4}(?:,\s*|-))* (\d{4}) \s*]
     )
   )?
   \)
@@ -54,8 +54,7 @@ while (/($old_re)/gx)
     my $start = pos() - length ($1);
     my $b4_copyright_line = $2;
     my $year_lines = $3;
-    my $sep = $4 ? $4 : "";
-    my $final_year = $5;
+    my $final_year = $4;
     $year_lines .= ')';
 
     # If there was a second argument, it contains years, so update them.
@@ -65,18 +64,7 @@ while (/($old_re)/gx)
         if ($final_year != $this_year)
           {
             # Update the year.
-            if ($sep eq '-' && $final_year + 1 == $this_year)
-              {
-                $year_lines =~ s/$final_year/$this_year/;
-              }
-            elsif ($sep ne '-' && $final_year + 1 == $this_year)
-              {
-                $year_lines =~ s/$final_year/$final_year-$this_year/;
-              }
-            else
-              {
-                $year_lines =~ s/$final_year/$final_year, $this_year/;
-              }
+            $year_lines =~ s/$final_year/$final_year, $this_year/;
           }
 
         # Normalize all whitespace.
@@ -85,6 +73,20 @@ while (/($old_re)/gx)
         # Put spaces after commas.
         $year_lines =~ s/, ?/, /g;
 
+        # Compress to intervals.
+        $year_lines =~
+          s/
+            (\d{4})
+            (?:
+              (,\ |-)
+              ((??{
+                if    ($2 eq '-') { '\d{4}'; }
+                elsif (!$3)       { $1 + 1;  }
+                else              { $3 + 1;  }
+              }))
+            )+
+          /$1-$3/gx;
+
         # Format within margin.
         my $year_lines_new;
         my $indent = index ($b4_copyright_line, '[');
@@ -117,29 +119,34 @@ while (/($old_re)/gx)
 
 while (/(\bb4_copyright\()/g)
   {
-    my $pos = pos ();
-    pos () -= length ($1);
+    my $start = pos () - length ($1);
+    my $end = pos ();
     my $re = $old_re;
+    pos () = $start;
     $re =~ s/\#BEFORE/\\G/;
     if (!/$re/x)
       {
+        my $line = (substr ($_, 0, $start) =~ s/\n/\n/g) + 1;
         print STDERR
-          "$ARGV: warning: failed to update a b4_copyright before char"
-          . " $pos\n";
+          "$ARGV:$line: warning: failed to update a b4_copyright\n";
       }
-    pos () = $pos;
+    pos () = $end;
   }
 
-while (/\[b4_copyright_years]/g)
+while (/(\[b4_copyright_years])/g)
   {
-    my $pos = pos ();
+    my $start = pos () - length ($1);
+    my $end = pos ();
     my $re = $old_re;
     $re =~ s/\#AFTER/\\G/;
     if (!/$re/x)
       {
+        # The substr operation blows away pos (), so restoring pos ()
+        # at the end is necessary.
+        my $line = (substr ($_, 0, $start) =~ s/\n/\n/g) + 1;
         print STDERR
-          "$ARGV: warning: failed to update a b4_copyright_years before"
-          . " char $pos\n";
+          "$ARGV:$line: warning: failed to update a"
+          . " b4_copyright_years\n";
       }
-    pos () = $pos;
+    pos () = $end;
   }