Add script to compute number of authors per year

kgryte · kgryte · commit 22161c766cc7 · 2016-10-21T03:08:01.000-07:00
diff --git a/tools/git/scripts/authors_per_year b/tools/git/scripts/authors_per_year
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+#
+# Prints the number of authors per month.
+#
+# <year> <number_of_authors>
+
+# * `git log`
+#   - Show logs.
+# * `awk '{}'`
+#   - Compute number of authors per year.
+# * `sort -n`
+#   - Sort in numerical order.
+git log --format=format:"%ad %aN" --date=format:"%Y" --use-mailmap | awk '
+{
+	name = $2 $3
+	key = $1 SUBSEP name
+	if (key in lines) {
+		next
+	}
+	lines[$1,name] = 1
+	counts[$1] += 1
+}
+
+END {
+	for (yr in counts) {
+		print yr OFS counts[yr]
+	}
+}
+'  | sort -n
