delta: get contributors without changing THANKS

Give contrithanks.sh the option to send the list of names to stdout so
that delta can use it appropriately for counting.

Closes #16449

scripts/contrithanks.sh

@@ -24,8 +24,7 @@
 ###########################################################################
 
 #
-# This script shows all mentioned contributors from <hash> until HEAD and
-# puts them at the end of the THANKS document on stdout
+# This script updates the docs/THANKS document.
 #
 
 set -eu
@@ -36,6 +35,13 @@ if test "$start" = "-h"; then
   echo "Usage: $0 <since this tag/hash>"
   exit
 fi
+if test "$start" = "stdout"; then
+    # output the names on stdout
+    use_stdout="yes"
+    start=""
+else
+    use_stdout="no";
+fi
 if test -z "$start"; then
   start=$(git tag --sort=taggerdate | grep "^curl-" | tail -1)
 fi
@@ -77,6 +83,8 @@ sed -f ./docs/THANKS-filter | \
 sort -fu | \
 grep -aixvFf ./docs/THANKS >> $rand
 
+if test "$use_stdout" = "no"; then
+
   # output header
   cat <<EOF >./docs/THANKS
  This project has been alive for many years. Countless people have provided
@@ -88,6 +96,10 @@ cat <<EOF >./docs/THANKS
 EOF
   # append all the names, sorted case insensitively
   grep -v "^ " $rand | sort -f $rand >> ./docs/THANKS
+else
+  # send all names on stdout
+  grep -v "^ " $rand | sort -f $rand
+fi
 
 # get rid of the temp file
 rm $rand

scripts/delta

@@ -52,7 +52,7 @@ $acommitters = `git shortlog -s | wc -l`;
 $ncommitters = $acommitters - $bcommitters;
 
 # number of contributors right now
-$acontribs = `./scripts/contrithanks.sh | grep -c '^[^ ]'`;
+$acontribs = `./scripts/contrithanks.sh stdout | wc -l`;
 # number when the tag was set
 $bcontribs = `git show $start:docs/THANKS | grep -c '^[^ ]'`;
 # delta