1 files changed, 52 insertions, 0 deletions
diff --git a/ci/generate_contributors.sh b/ci/generate_contributors.sh
new file mode 100644
index 000000000..b957d486d
--- /dev/null
+++ b/ci/generate_contributors.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+set -e
+
+# ###########################################################################################################
+# This script generates a AUTHORS file in the current directory based on the
+# output of the git log command. It splits the contributors in 2 groups:
+#  * The "active contributors" are the contributors that authored commits over the last 2 years
+#  * The "retired contributors" are the contributors that have authored commits but not over the last 2 years
+# Note: it uses git's mailmap functionnality to get a clean list of users
+# ###########################################################################################################
+
+declare -A CONTRIBUTORS=()
+declare -a authors=()
+TWO_YEARS_AGO=`date +%s --date="2 years ago"`
+retiredTitleWritten=false
+
+git log --encoding=utf-8 --full-history --date=short --use-mailmap "--format=format:%ad;%aN" |
+{
+  echo "# Active contributors:" > AUTHORS
+  while read -r line; do
+    IFS=';'; arrLine=($line); unset IFS;
+    author=${arrLine[1]}
+    commitDate=`date +%s --date="${arrLine[0]}"`
+  
+    # Exclude circleci
+    if [[ $author =~ [Cc]ircle\s*[Cc][Ii] ]]; then
+      continue
+    fi
+  
+    # indicates that the commits are now older than 2 years so we print the
+    # sorted list of active contributors and reset the authors array
+    if [ "$retiredTitleWritten" = false ]; then
+      if [ $TWO_YEARS_AGO -ge $commitDate ]; then
+        IFS=$'\n' sorted=($(sort <<<"${authors[*]}"))
+        printf "%s\n" "${sorted[@]}" >> AUTHORS
+        authors=()
+        echo -e "\n# Retired contributors:" >> AUTHORS
+        retiredTitleWritten=true
+      fi
+    fi
+  
+    # using the map as an easy way to check if the author has already been listed
+    if [ -z "${CONTRIBUTORS[${author}]}" ]; then
+      CONTRIBUTORS[${author}]=${arrLine[0]}
+      authors+=("${author}")
+    fi
+  done
+  # We are still in the subprocess scope so we can print the sorted list of
+  # retired contributors
+  IFS=$'\n' sorted=($(sort <<<"${authors[*]}"))
+  printf "%s\n" "${sorted[@]}" >> AUTHORS
+}