Merge pull request #1 from nimblehq/feature/tag-master-as-latest

Extract correct branch_tag for master branch and tags

Author: hoangmirs

README.md

@@ -1,9 +1,11 @@
 # Branch tag action
 
-This action returns the valid docker image tag name by extracting the branch from branch name or tag ref and replacing `/` by `-` using [Shell Parameter Expansion](https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html)
+This action returns the valid docker image tag name by extracting the branch from branch or tag ref and replacing `/` by `-` using [Shell Parameter Expansion](https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html)
 
 ```
-#refs/heads/feature/add-new-action -> feature-add-new-action
+refs/heads/feature/add-new-action -> feature-add-new-action
+refs/tags/1.0.0 -> 1.0.0
+refs/heads/master -> latest
 ```
 
 ## Inputs

entrypoint.sh

@@ -1,9 +1,16 @@
 #!/bin/sh -l
 
-BRANCH_NAME="${1#refs/heads/}"
+REF="${1#refs/}"
+BRANCH_NAME="${REF#heads/}"
+TAG_NAME="${REF#tags/}"
 
-# shellcheck disable=SC2039
-BRANCH_TAG="${BRANCH_NAME/\//-}"
+if [[ $BRANCH_NAME == master ]]; then
+  BRANCH_TAG=latest
+elif [[ $TAG_NAME != $REF ]]; then
+  BRANCH_TAG=$TAG_NAME
+else
+  BRANCH_TAG="${BRANCH_NAME//\//-}"
+fi
 
 echo "::set-env name=BRANCH_TAG::$BRANCH_TAG"
 echo "::set-output name=branch_tag::$BRANCH_TAG"