From bbfd8c9caca78ef781cd27760c83de14df061503 Mon Sep 17 00:00:00 2001
From: Tsuyoshi CHO <Tsuyoshi.CHO@Gmail.com>
Date: Sun, 14 Feb 2021 13:55:28 +0900
Subject: [PATCH] Add support tag checker

---
 action.yml    |  4 ++++
 entrypoint.sh | 28 +++++++++++++++++++++-------
 2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/action.yml b/action.yml
index 7fcaf23..28532f8 100644
--- a/action.yml
+++ b/action.yml
@@ -14,6 +14,10 @@ inputs:
   repo:
     description: 'target GitHub repository. e.g. reviewdog/reviewdog'
     required: true
+  tag:
+    description: 'Check tags instead of releases.'
+    default: 'false'
+    required: false
 runs:
   using: 'docker'
   image: 'Dockerfile'
diff --git a/entrypoint.sh b/entrypoint.sh
index 4b47069..b306b64 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -27,13 +27,27 @@ list_releases() {
     curl -s "https://api.github.com/repos/${REPO}/releases"
   fi
 }
-LATEST_VERSION="$(\
-  list_releases | \
-  jq -r '.[] | .tag_name' | \
-  grep -oP '\d+\.\d+(\.\d+)?(-[^'\''\"\s]*)?$' | \
-  sort --version-sort --reverse | \
-  head -n1 \
-)"
+
+LATEST_VERSION="${CURRENT_VERSION}"
+if [ "${INPUT_TAG:-false}" = "true" ]; then
+  echo "Check remote tag instead of release" >&2
+  LATEST_VERSION="$(\
+    git ls-remote -q --tags "https://github.com/${REPO}.git" | \
+    awk '{ print $2 }' | \
+    grep -oP '\d+\.\d+(\.\d+)*(-[^'\''\"\s]*)?$' | \
+    sort --version-sort --reverse | \
+    head -n1 \
+    )"
+else
+  LATEST_VERSION="$(\
+    list_releases | \
+    jq -r '.[] | .tag_name' | \
+    grep -oP '\d+\.\d+(\.\d+)*(-[^'\''\"\s]*)?$' | \
+    sort --version-sort --reverse | \
+    head -n1 \
+    )"
+fi
+
 if [ -z "${LATEST_VERSION}" ]; then
   echo "cannot get latest ${REPO} version"
   exit 1