From b583fa54a61792a0ea3914d5d9954846c3bb8957 Mon Sep 17 00:00:00 2001
From: Rick Barenthin <rick@ng-voice.com>
Date: Mon, 23 May 2022 04:13:41 +0200
Subject: [PATCH] feat(scripts): changelog script

---
 scripts/changelog.sh | 138 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100755 scripts/changelog.sh

diff --git a/scripts/changelog.sh b/scripts/changelog.sh
new file mode 100755
index 0000000..0cf190a
--- /dev/null
+++ b/scripts/changelog.sh
@@ -0,0 +1,138 @@
+#!/usr/bin/env sh
+
+config_file=.version.json
+
+reverse() {
+    if which tac >/dev/null 2>&1; then
+        tac
+    else
+        tail -r
+    fi
+}
+
+generate_config() {
+    sha="$(git rev-parse --short HEAD)"
+    (
+        echo '{'
+        echo '"version": "0.0.0",'
+        echo '"sha": "'"$sha"'"'
+        echo '}'
+    ) | jq . > $config_file
+}
+
+get_git_commits() {
+    since_hash="$(jq '.sha' < $config_file | tr -d '"')"
+    git rev-list "$since_hash..HEAD"
+}
+
+get_git_commit_subject() {
+    git show -s --format=%s "$1"
+}
+
+get_git_commit_body() {
+    git show -s --format=%b "$1"
+}
+
+get_commit_type() {
+    echo "$1" | sed -r -n 's/([a-z]+)(\(?|:?).*/\1/p'
+}
+
+get_commit_scope() {
+    echo "$1" | sed -r -n 's/[a-z]+\(([^)]+)\).*/\1/p'
+}
+
+get_commit_description() {
+    echo "$1" | sed -r -n 's/.*:[ ]+(.*)/\1/p'
+}
+
+get_commit_footer() {
+    with_colon=$(echo "$1" | sed -n '/^[A-Za-z-]\{1,\}: /,//{p;}')
+    with_hash=$(echo "$1" | sed -n '/^[A-Za-z-]\{1,\} #/,//{p;}')
+
+    if [ ${#with_colon} -gt ${#with_hash} ]; then
+        echo "$with_colon"
+    else
+        echo "$with_hash"
+    fi
+}
+
+get_commit_body() {
+    pattern=$(get_commit_footer "$1" | head -n 1)
+    if [ -n "$pattern" ]; then
+        echo "$1" | sed -e "/$pattern/,\$d"
+    else
+        echo "$1"
+    fi
+}
+
+is_breaking_change() {
+    if echo "$1" | grep -q '!' || echo "$2" | grep -q 'BREAKING[ -]CHANGE: '; then
+        echo "yes"
+    else
+        echo "no"
+    fi
+}
+
+get_breaking_change() {
+    with_colon=$(echo "$1" | sed -n  '/^BREAKING[ -]CHANGE: /,/^[A-Za-z-]\{1,\}: /{ s/BREAKING[ -]CHANGE: \(.*\)/\1/; /^[A-Za-z-]\{1,\}: /!p;}')
+    with_hash=$(echo "$1" | sed -n  '/^BREAKING[ -]CHANGE: /,/^[A-Za-z-]\{1,\} #/{ s/BREAKING[ -]CHANGE: \(.*\)/\1/; /^[A-Za-z-]\{1,\} #/!p;}')
+    if [ -n "$with_colon" ] && ! echo "$with_colon" | grep -q '[A-Za-z-]\{1,\} #'; then
+        echo "$with_colon"
+    else
+        echo "$with_hash"
+    fi
+}
+
+generate_changelog_entry() {
+    is_patch=0
+    is_minor=0
+    is_major=0
+    for commit in $(get_git_commits); do
+        git_subject=$(get_git_commit_subject "$commit")
+        git_body=$(get_git_commit_body "$commit")
+
+        type=$(get_commit_type "$git_subject")
+        scope=$(get_commit_scope "$git_subject")
+        description=$(get_commit_description "$git_subject")
+        body=$(get_commit_body "$git_body")
+        footer=$(get_commit_footer "$git_body")
+        breakingchange=$(get_breaking_change "$footer")
+        isbreaking=$(is_breaking_change "$git_subject" "$footer")
+        if [ "$isbreaking" = "yes" ] && [ -z "$breakingchange" ]; then
+            breakingchange="$body"
+        fi
+
+        echo "--------------------------------"
+        echo "Subject : $git_subject"
+        echo "Body: $git_body"
+        echo
+        echo "********************************"
+        echo
+        echo "  - type           : $type"
+        echo "  - scope          : $scope"
+        echo "  - description    : $description"
+        echo "  - body           : $body"
+        echo "  - footer         : $footer"
+        echo "  - breakingchange : $breakingchange"
+        echo "  - isbreaking     : $isbreaking"
+        echo
+        echo "--------------------------------"
+        echo
+        echo
+    done;
+}
+
+
+init() {
+    if [ ! -f "$config_file" ]; then
+        echo "Generating a config ... "
+        generate_config
+        echo "Done"
+    else
+        echo "Using existing config"
+    fi
+
+    generate_changelog_entry
+}
+
+init
\ No newline at end of file