feat: add detection of versions for tags (#21)

src/index.ts

@@ -14,6 +14,7 @@ import { generatePRListString } from './utils/generatePRListString'
 import { generateSlackMessage } from './utils/generateSlackMessage'
 import { parseTicketNumberFromTitle } from './utils/parseTicketNumberFromTitle'
 import { generateJiraTicketLink } from './utils/generateJiraTicketLink'
+import { compareSemVer } from './utils/compareSemVer'
 
 // eslint-disable-next-line @typescript-eslint/require-await
 export async function run(): Promise<void> {
@@ -36,6 +37,21 @@ export async function run(): Promise<void> {
       return
     }
 
+    // remove the "v" from the start of the tag, if it's there
+    const currentVersion = currentTag.name.startsWith('v')
+      ? currentTag.name.slice(1)
+      : currentTag.name
+    const previousVersion = previousTag.name.startsWith('v')
+      ? previousTag.name.slice(1)
+      : previousTag.name
+
+    const comparisonResult = compareSemVer(currentVersion, previousVersion)
+
+    if (comparisonResult <= 0) {
+      core.warning('Current tag is not greater than the previous tag. Exiting.')
+      return
+    }
+
     // Get all the commits between the current and previous tags
     const commits = await getCommitsBetweenTags(
       octokit,

src/utils/__tests__/compareSemVer.test.ts

@@ -0,0 +1,11 @@
+import { compareSemVer } from '../compareSemVer'
+
+describe('compareSemVer', () => {
+  test('it should correctly compare version numbers', () => {
+    expect(compareSemVer('1.0.0', '1.0.0')).toBe(0)
+    expect(compareSemVer('1.0.0', '0.9.9')).toBe(1)
+    expect(compareSemVer('1.0.0', '1.0.1')).toBe(-1)
+    expect(compareSemVer('1.2.3', '1.2')).toBe(1)
+    expect(compareSemVer('1.0', '1.0.1')).toBe(-1)
+  })
+})

src/utils/compareSemVer.ts

@@ -0,0 +1,26 @@
+/**
+ * Compare two semantic version strings.
+ *
+ * @param version1 - The first version string
+ * @param version2 - The second version string
+ *
+ * @returns -1 if version1 < version2, 0 if they're equal, and 1 if version1 > version2.
+ */
+export function compareSemVer(version1: string, version2: string): number {
+  const v1parts = version1.split('.').map(Number)
+  const v2parts = version2.split('.').map(Number)
+
+  for (let i = 0; i < v1parts.length; ++i) {
+    if (v2parts.length === i) {
+      return 1
+    }
+    if (v1parts[i] === v2parts[i]) {
+      continue
+    } else if (v1parts[i] > v2parts[i]) {
+      return 1
+    } else {
+      return -1
+    }
+  }
+  return v1parts.length !== v2parts.length ? -1 : 0
+}

src/utils/generateJiraTicketLink.ts

@@ -9,7 +9,6 @@ export function generateJiraTicketLink(
   ticketNumber: string,
   instanceUrl: string
 ): string {
-
   // Ensure instanceUrl ends with a slash
   const formattedInstanceUrl = instanceUrl.endsWith('/')
     ? instanceUrl