Add previous-release-tag output

Author: gaggle

.github/actions/version/action.yml

@@ -30,12 +30,17 @@ outputs:
     description: "Determines if the current state of the codebase should released, determined by whether the commit is for the default branch and if the version it's associated with has already been released"
     value: ${{ steps.entrypoint.outputs.releasable }}
 
+  previous-release-tag:
+    description: "The previous release's tag"
+    value: ${{ steps.entrypoint.outputs.previous-release-tag }}
+
 runs:
   using: "composite"
   steps:
     - run: ${{ github.action_path }}/entrypoint.sh
       id: entrypoint
       shell: bash
       env:
-        INPUT_SEMVER: ${{ inputs.semver }}
+        GH_TOKEN: ${{ github.token }}
         INPUT_DEFAULT_BRANCH: ${{ inputs.default-branch }}
+        INPUT_SEMVER: ${{ inputs.semver }}

.github/actions/version/entrypoint.sh

@@ -65,6 +65,19 @@ check_git_tag_exists() {
   git show-ref --tags "v$1" --quiet && echo "true" || echo "false"
 }
 
+is_valid_semver() {
+  local version=$1
+  if [[ $version =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
+    return 0 # valid semver
+  else
+    return 1 # invalid semver
+  fi
+}
+
+get_previous_release_tag() {
+  echo "$(gh release list | awk 'NR==1{print $3}')"
+}
+
 debug_log "Processing default_branch..."
 default_branch="$INPUT_DEFAULT_BRANCH"
 debug_log "  $default_branch"
@@ -85,9 +98,14 @@ debug_log "Processing releasable..."
 releasable="$( [ "$ref" == "refs/heads/${default_branch}" ] && [ "$tag_exists" == "false" ] && echo "true" || echo "false" )"
 debug_log "  $releasable"
 
+debug_log "Processing previous_release_tag..."
+previous_release_tag=$(get_previous_release_tag "$semver")
+debug_log "  $previous_release_tag"
+
 set_output "$(parse_semver_component "$semver" 1)" "major"
 set_output "$(parse_semver_component "$semver" 2)" "minor"
 set_output "$(parse_semver_component "$semver" 3)" "patch"
+set_output "$previous_release_tag" "previous-release-tag"
 set_output "$releasable" "releasable"
 set_output "$semver" "semver"
 set_output "$tag_exists" "tag-exists"

.github/workflows/ci-cd.yml

@@ -16,6 +16,7 @@ jobs:
   version:
     runs-on: ubuntu-latest
     outputs:
+      previous-release-tag: ${{ steps.parse.outputs.previous-release-tag }}
       semver: ${{ steps.parse.outputs.semver }}
       releasable: ${{ steps.parse.outputs.releasable }}
       tag-exists: ${{ steps.parse.outputs.tag-exists }}