maint: generate distributed THANKS from VC'd THANKS.in

* Makefile.am (THANKS): New rule.
* THANKS.in: New file.
* THANKS: Remove.  Now it's generated from the combination of
THANKS.in and git logs.
* .mailmap: New file.
* cfg.mk (sc_THANKS_in_duplicates): New syntax-check rule, from
coreutils.
* .gitignore: Add THANKS.
* thanks-gen: New file, from coreutils.

1 files changed, 16 insertions, 0 deletions

diff --git a/thanks-gen b/thanks-gen
new file mode 100755
index 00000000..f1c11b3a
--- /dev/null
+++ b/thanks-gen
@@ -0,0 +1,16 @@
+#!/usr/bin/perl -nl
+# Use Perl's multi-byte alignment code, via sprintf, while
+# performing a rudimentary check for duplicate names and
+# removing duplicate name,email pairs.
+use Encode;
+
+BEGIN { my (%seen, %name) }
+
+chomp;
+my ($name, $email) = split '\0', decode ('UTF-8', $_);
+
+$seen{$name}++
+  and warn "$0: THANKS.in: duplicate name: $name\n";
+
+print encode ('UTF-8', sprintf ('%-36s', $name)), $email
+  unless $seen{"$name\0$email"}++;