Add step to calculate next actual semantic version (#39)

* Add step to calculate next actual semantic version

* Don't error on unchanged version

* Fix character range in sed expression

Co-authored-by: Peter Jenkins <[email protected]>

* Fix character range in sed expression

Co-authored-by: Peter Jenkins <[email protected]>

* Consume all non-numeric characters at the start of the version

---------

Co-authored-by: Peter Jenkins <[email protected]>

get-next-semantic-version/action.yml

@@ -16,19 +16,31 @@ outputs:
   version:
     description: "Git base branch"
     value: ${{ steps.version_check.outputs.version }}
+  previous_version:
+    description: "Previous tagged version"
+    value: ${{ steps.tag_info.outputs.last_tag }}
+  next_version:
+    description: "Next version tag name"
+    value: ${{ steps.calcaulate-version.outputs.next_version }}
   continue_release:
     description: "true if it is ok to continue the release process"
     value: ${{ steps.version_check.outputs.continue_release }}
 runs:
   using: "composite"
   steps:
     - name: Calculate PR filters
-      id: filters
+      id: tag_info
       shell: bash
       run: |
-        last_tag_date=$(git log -1 --exclude="*alpha*" --tags --no-walk --pretty="format:%cI")
+        last_tag_commit="$(git log -1 --exclude="*alpha*" --tags --no-walk --pretty="format:%H")"
+        last_tag="$(git describe --tags --abbrev=0 "$last_tag_commit")"
+        last_tag_date="$(git log -1 --exclude="*alpha*" --no-walk --pretty="format:%cI" "$last_tag_commit")"
         start_date=$(date -Is -d "$last_tag_date")
-        echo "start_date=$start_date" >> "$GITHUB_OUTPUT"
+        {
+          echo "start_date=$start_date"
+          echo "last_tag=$last_tag"
+          echo "last_tag_commit=$last_tag_commit"
+        } >> "$GITHUB_OUTPUT"
     - name: Get PR labels
       uses: octokit/[email protected]
       id: get_latest_prs
@@ -51,7 +63,7 @@ runs:
               }
             }
           }
-        filter: repo:${{ github.repository }} is:pr base:${{ inputs.git_default_branch }} merged:>${{ steps.filters.outputs.start_date }}
+        filter: repo:${{ github.repository }} is:pr base:${{ inputs.git_default_branch }} merged:>${{ steps.tag_info.outputs.start_date }}
       env:
         GITHUB_TOKEN: "${{ inputs.token }}"
     - name: Get version being bumped
@@ -75,3 +87,13 @@ runs:
       if: steps.version_check.outputs.continue_release == 'true'
       shell: bash
       run: echo "Based on tags, we're updating ${{ steps.version_check.outputs.VERSION }} version!"
+
+    - name: Calculate version
+      id: calcaulate-version
+      shell: bash
+      env:
+        BUMP: ${{ steps.version_check.outputs.VERSION }}
+        PREVIOUS_VERSION: ${{ steps.tag_info.outputs.last_tag }}
+      run: |
+        NEXT_VERSION="$("${GITHUB_ACTION_PATH}/calculate-version.sh" "$BUMP" "$PREVIOUS_VERSION")"
+        echo "next_version=$NEXT_VERSION" >> "$GITHUB_OUTPUT"

get-next-semantic-version/calculate-version.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+calculate_version() {
+    local bump="$1"
+    local previous_version="$2"
+    local prefix=
+    local version=
+    # shellcheck disable=SC2001
+    prefix="$(echo "$previous_version" | sed -e 's/^\([a-zA-Z]*\).*/\1/')"
+    # shellcheck disable=SC2001
+    version="$(echo "$previous_version" | sed -e 's/^[a-zA-Z]*\(.*\)/\1/')"
+
+    local without_patch="${version%.*}"
+    local major="${version//.*/}"
+    local minor="${without_patch//*./}"
+    local patch="${version//*./}"
+
+    if [[ "$bump" == "major" ]]; then
+        major=$(( major + 1 ))
+    elif [[ "$bump" == "minor" ]]; then
+        minor=$(( minor + 1 ))
+    elif [[ "$bump" == "patch" ]]; then
+        patch=$(( patch + 1 ))
+    elif [[ "$bump" == "" ]]; then
+        echo "No version to bump" 1>&2
+        exit 0
+    else
+        echo "Unknown version bump $bump" 1>&2
+        exit 1
+    fi
+
+    echo "$prefix$major.$minor.$patch"
+}
+
+
+calculate_version "$1" "$2"