fix: find last stable release tag using semver (#48)

src/git.ts

@@ -23,15 +23,27 @@ export async function getGitTags() {
     .reverse()
 }
 
+function getTagWithoutPrefix(tag: string) {
+  return tag.replace(/^v/, '')
+}
+
 export async function getLastMatchingTag(inputTag: string) {
-  const isVersion = semver.valid(semver.coerce(inputTag))
+  const inputTagWithoutPrefix = getTagWithoutPrefix(inputTag)
+  const isVersion = semver.valid(inputTagWithoutPrefix) !== null
   const isPrerelease = semver.prerelease(inputTag) !== null
   const tags = await getGitTags()
 
   let tag: string | undefined
   // Doing a stable release, find the last stable release to compare with
-  if (!isPrerelease && isVersion)
-    tag = tags.find(tag => tag !== inputTag && tag[0] === 'v' && !tag.includes('-'))
+  if (!isPrerelease && isVersion) {
+    tag = tags.find((tag) => {
+      const tagWithoutPrefix = getTagWithoutPrefix(tag)
+
+      return tagWithoutPrefix !== inputTagWithoutPrefix
+        && semver.valid(tagWithoutPrefix) !== null
+        && semver.prerelease(tagWithoutPrefix) === null
+    })
+  }
 
   // Fallback to the last tag, that are not the input tag
   tag ||= tags.find(tag => tag !== inputTag)