a small script to show the different between the current file version and its last revision (requires Perl)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

difflast.pl

@@ -0,0 +1,76 @@
+#!/usr/bin/perl -w
+
+###############################################################################
+# Name:     difflast.pl
+# Purpose:  Shows the difference between the current local version of the file
+#           and the last cvs revision
+# Version:  $Id$
+# Author:   VZ
+# Created:  23.12.99
+# Copyright:(c) Vadim Zeitlin 1999
+###############################################################################
+
+use strict;
+
+my $CVS = "cvs -z3";    # the cvs command
+
+sub dec_rev($)
+{
+    my $rev = $_[0];
+
+    # decrement the revision number to get the previos one
+    # (FIXME this is totally bogus, won't work with branches)
+    my $revlen = length($rev) - rindex($rev, '.') - 1;
+    my $m = 10**$revlen;
+
+    return int($rev) . "." . ($rev*$m - int($rev)*$m - 1)
+}
+
+sub get_last_rev($)
+{
+    my $file = $_[0];
+
+    my $basename = $file;
+    $basename =~ s@^.*/([^/]\+)@$1@;
+
+    # first get the current version: try the Id RCS tag in the file itself
+    # first, use "cvs status" if this fails
+    if ( open(INPUT, $file) ) {
+        while (<INPUT>) {
+            if ( /\$Id$basename,v (\d+\.\d+)/ ) {
+                return &dec_rev($1);
+            }
+        }
+    }
+
+    open(INPUT, "$CVS -q status $file |") or return 0;
+
+    while (<INPUT>) {
+        if ( /Working revision:\s+(\d+\.\d+)/ ) {
+            return &dec_rev($1);
+        }
+    }
+
+    return 0;
+}
+
+sub process_file($)
+{
+    my $file = $_[0];
+    my $revlast = &get_last_rev($file);
+
+    if ( !$revlast ) {
+        warn "Failed to get the last revision for $file, skipping.\n"
+    }
+    else {
+        print `$CVS diff -b -kk -r $revlast $file`;
+    }
+}
+
+# entry point
+
+die "Usage: $0 <filenames...>\n" if ( $#ARGV == -1 );
+
+foreach my $file (@ARGV) { process_file($file); }
+
+exit 0;