1 files changed, 74 insertions, 0 deletions

diff --git a/.github/scripts/changelog.sh b/.github/scripts/changelog.sh
new file mode 100644
index 0000000..76492cf
--- /dev/null
+++ b/.github/scripts/changelog.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+# Copyright (c) 2023 Joshua Sing <joshua@hypera.dev>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#
+# Usage: changelog.sh <version>
+#  Reads the changelog for the specified version from the changelog file.
+#  The output will be reformatted for use in GitHub releases.
+#
+#  The changelog file defaults to "ChangeLog", but can be changed by setting
+#  the environment variable $CHANGELOG_FILE
+#
+
+set -e
+
+# Check if the version argument is provided
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <version>"
+    exit 1
+fi
+
+version="${1#v}"
+changelog_file="${CHANGELOG_FILE:-ChangeLog}"
+found_version=false
+changelog=""
+
+# Check if the specified changelog file exists
+if [ ! -f "$changelog_file" ]; then
+    echo "Error: Changelog file '$changelog_file' not found"
+    exit 1
+fi
+
+# Read the changelog file line by line
+while IFS= read -r line; do
+    # Check for the version line
+    if echo "$line" | grep -Eq "^${version} - "; then
+      found_version=true
+      continue
+    fi
+
+    # Continue reading the changelog until the next version or end of file,
+    # skipping empty lines
+    if $found_version; then
+      echo "$line" | grep -Eq "^\s*$" && continue
+      echo "$line" | grep -Eq "^[0-9]+\.[0-9]+\.[0-9]+ - " && break
+      changelog="${changelog}${line}\n"
+    fi
+done < "$changelog_file"
+
+# If the specified version was not found, print an error
+if ! $found_version; then
+    echo "Error: Version $version was not found in changelog"
+    exit 1
+fi
+
+# Tidy up the changelog for displaying on GitHub
+changelog=$(echo "$changelog" | sed -e 's/^\t\*/###/' -e 's/^\t//')
+
+# Print the changelog for the specified version
+echo "$changelog"
+echo
+echo "Full changelog: https://github.com/libressl/portable/blob/master/ChangeLog"
+exit 0