Refactor tagging (#35)

Author: fmenezes

.github/workflows/tag.yml

@@ -19,9 +19,6 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: Set $TAG env var
-      run: echo "${{github.ref}}" | sed 's/refs\/tags\///' | xargs -I $ echo "::set-env name=TAG::$"
-
     - name: Generate list of changes
       run: scripts/generate_release_notes.sh > .release.md
 

scripts/generate_release_notes.sh

@@ -1,14 +1,24 @@
 #!/usr/bin/env bash
 
-if [ -z "$TAG" ]
+GITHUB_REF=${GITHUB_REF:-refs/heads/master}
+
+git rev-parse $GITHUB_REF > /dev/null 2>&1
+if [ $? != 0 ]
 then
-      echo "\$TAG is empty"
+      echo "\$GITHUB_REF is invalid"
       exit 1
 fi
 
-export PREVIOUS_TAG=$(git tag --sort=refname | grep $TAG -B 1 | grep -m1 "")
+if [[ $GITHUB_REF = refs/tags/* ]]
+then
+      # previous tag
+      export PREVIOUS_REF=$(git tag --sort=refname --format='%(refname)' | grep $GITHUB_REF -B 1 | grep -m1 "")
+else
+      # latest tag
+      export PREVIOUS_REF=$(git tag --sort=-refname --format='%(refname)' | grep -m1 "")
+fi
 
 cat <<EOF
 ## Changes
-$(git log $TAG...$PREVIOUS_TAG --format="- [%h](../../commit/%h) %s")
+$(git log $GITHUB_REF...$PREVIOUS_REF --format="- [%h](../../commit/%h) %s")
 EOF