From 41a040c60ed9359deb1daa64bd0504a4c242b0ad Mon Sep 17 00:00:00 2001
From: Phil Jay <phil.jay@reece.com.au>
Date: Wed, 20 Oct 2021 11:18:23 +1100
Subject: [PATCH] Add initial codebase

---
 .github/workflows/test-and-release.yml |  64 +++++++++++
 .gitignore                             |  72 ++++++++++++
 README.md                              | 103 +++++++++++++++++
 action.yml                             |  42 +++++++
 shared.sh                              |  21 ++++
 tests/helper_print-info.bash           |   9 ++
 tests/test_version_increment.bats      | 147 +++++++++++++++++++++++++
 tests/test_version_lookup.bats         | 115 +++++++++++++++++++
 version-increment.sh                   |  93 ++++++++++++++++
 version-lookup.sh                      |  66 +++++++++++
 10 files changed, 732 insertions(+)
 create mode 100644 .github/workflows/test-and-release.yml
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 action.yml
 create mode 100644 shared.sh
 create mode 100644 tests/helper_print-info.bash
 create mode 100644 tests/test_version_increment.bats
 create mode 100644 tests/test_version_lookup.bats
 create mode 100755 version-increment.sh
 create mode 100755 version-lookup.sh

diff --git a/.github/workflows/test-and-release.yml b/.github/workflows/test-and-release.yml
new file mode 100644
index 0000000..de4b40b
--- /dev/null
+++ b/.github/workflows/test-and-release.yml
@@ -0,0 +1,64 @@
+---
+name: Test and Release
+
+on:
+  push:
+    branches:
+      - '**'
+    tags-ignore:
+      - '**'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Run ShellCheck
+        uses: ludeeus/action-shellcheck@94e0aab03ca135d11a35e5bfc14e6746dc56e7e9
+        with:
+          check_together: 'yes'
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup bats
+        uses: mig4/setup-bats@af9a00deb21b5d795cabfeaa8d9060410377686d
+        with:
+          bats-version: 1.2.1
+
+      - name: Test
+        run: bats tests/*.bats
+
+  release:
+    needs:
+      - lint
+      - test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Lookup version
+        id: version-lookup
+        run: ./version-lookup.sh
+
+      - name: Increment version
+        id: version-increment
+        run: ./version-increment.sh
+        env:
+          current_version: ${{ steps.version-lookup.outputs.current-version }}
+          INPUT_SCHEME: calver
+
+      - name: Release version
+        uses: marvinpinto/action-automatic-releases@919008cf3f741b179569b7a6fb4d8860689ab7f0
+        if: ${{ github.ref == 'refs/heads/main' }}
+        with:
+          repo_token: "${{ secrets.GITHUB_TOKEN }}"
+          draft: false
+          prerelease: false
+          automatic_release_tag: "${{ steps.version-increment.outputs.version }}"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4acf457
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,72 @@
+.tmp_testing/
+
+
+##-- Vim ignores
+
+# Swap
+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+*~
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+
+##-- MacOS ignores
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon

+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+
+##-- Windows ignores
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..91337ce
--- /dev/null
+++ b/README.md
@@ -0,0 +1,103 @@
+# ➕ Version Increment
+
+## 📄 Use
+
+### ⌨️ Example
+
+```yaml
+      - name: Get next version
+        uses: reecetech/version-increment
+        id: version
+        with:
+          scheme: semver
+          increment: patch
+
+      - name: Build image
+        uses: docker/build-push-action@v2
+        with:
+          push: false
+          tags: "example/application:${{ steps.version.outputs.version }}"
+          context: .
+```
+
+### 🔖 semver
+This action will detect the current latest _normal_ semantic version (semver) from the tags in
+a git repository.  It will increment the version as directed (by default: +1 to
+the patch digit).  Both the current latest and the incremented version are
+reported back as outputs.
+
+Normal semantic versions are made up of a major, minor and patch digit.  Normal
+versions do not include pre-release versions, or versions with build meta-data.
+
+e.g. `1.2.7`
+
+See: https://semver.org/spec/v2.0.0.html
+
+### 📅 calver (semver compliant)
+
+Optionally, this action can provide semver compliant calendar versions (calver).
+In this calver scheme, the semver  major, minor and patch digits map to year,
+month and release digits.
+
+Note: to be semver compliant, digits must not have leading zeros.
+
+e.g. `2021.6.2`
+
+| semver | calver  | example | note |
+| :---   | :---    | :---    | :--- |
+| major  | year    | `2021`  |
+| minor  | month   | `6`     |
+| patch  | release | `2`     | The *n*th release for the month |
+
+If the current latest normal version is not the current year and month, then the year and month digits will be
+set to the current year and month, and the release digit will be reset to 1.
+
+### 🎋 Default branch vs. any other branch
+
+**Default branch**
+
+The action will return a _normal_ version if it is detected that the current commit is on the default branch (usually `main`).
+
+Examples:
+* `1.2.7`
+* `2021.6.2`
+
+**Any other branch**
+
+The action will return a _pre-release_ version if any other branch is detected (e.g. `new-feature`, `bugfix/foo`, etc).  The _pre-release_ portion of the version number will be the literal string `pre.` followed by the git commit ID short reference SHA (trimmed of any leading zeros).
+
+Examples:
+* `1.2.7-pre.41218aa78`
+* `2021.6.2-pre.32fd19841`
+
+### 📥 Inputs
+
+| name      | description                                               | required | default  |
+| :---      | :---                                                      | :---     | :---     |
+| scheme    | The versioning scheme in-use, either `semver` or `calver` | No       | `semver` |
+| increment | The digit to increment, either `major`, `minor` or `patch`, ignored if `scheme` == `calver` | No | `patch` |
+
+### 📤 Outputs
+
+| name            | description                                                        |
+| :---            | :---                                                               |
+| current_version | The current latest version detected from the git repositories tags |
+| version         | The incremented version number (e.g. the next version)             |
+
+## 💕 Contributing
+
+Please raise a pull request, but note the testing tools below
+
+### bats
+
+BATS is used to test the logic of the shell scripts.
+
+See: https://github.com/bats-core/bats-core
+
+### shellcheck
+
+Shellcheck is used to lint our shell scripts.
+
+Please use [local ignores](https://stackoverflow.com/a/52659039) if you'd like to skip any particular checks.
+
+See: https://github.com/koalaman/shellcheck
diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..72f58b1
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,42 @@
+---
+name: 'Version Increment'
+description: |
+  Inspects the git tags to determine the current normal version, and returns the
+  next version number.
+
+  A normal version will be returned if the branch is the default branch
+  (usually `main`), otherwise a pre-release version will be returned.
+
+inputs:
+  scheme:
+    description: 'Versioning scheme - semver, or, calver (defaults to semver)'
+    required: false
+    default: 'semver'
+  increment:
+    description: |
+      Field to increment - major, minor, or, patch (defaults to patch)
+
+      Not applicable to `calver` scheme
+    required: false
+    default: 'patch'
+
+outputs:
+  current_version:
+    description: 'Current normal version detected'
+    value: ${{ steps.version-lookup.outputs.current-version }}
+  version:
+    description: 'Incremented version calculated'
+    value: ${{ steps.version-increment.outputs.version }}
+
+runs:
+  using: "composite"
+  steps:
+    - id: version-lookup
+      run: ${{ github.action_path }}/version-lookup.sh
+      shell: bash
+
+    - id: version-increment
+      run: ${{ github.action_path }}/version-increment.sh
+      shell: bash
+      with:
+        current_version: ${{ steps.version-lookup.outputs.current-version }}
diff --git a/shared.sh b/shared.sh
new file mode 100644
index 0000000..c41fb9c
--- /dev/null
+++ b/shared.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+# shellcheck disable=SC2034
+set -euo pipefail
+
+# see: https://semver.org/spec/v2.0.0.html#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
+pcre_semver='^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$'
+pcre_master_ver='^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)$'
+pcre_allow_vprefix="^v{0,1}${pcre_master_ver:1}"
+pcre_old_calver='^(?P<major>0|[1-9]\d*)-0{0,1}(?P<minor>0|[0-9]\d*)-R(?P<patch>0|[1-9]\d*)$'
+
+##==----------------------------------------------------------------------------
+##  MacOS compatibility - for local testing
+
+export grep="grep"
+if [[ "$(uname)" == "Darwin" ]] ; then
+    export grep="ggrep"
+    if ! grep --version 1>/dev/null ; then
+        echo "🛑 GNU grep not installed, try brew install coreutils" 1>&2
+        exit 9
+    fi
+fi
diff --git a/tests/helper_print-info.bash b/tests/helper_print-info.bash
new file mode 100644
index 0000000..a62a7b3
--- /dev/null
+++ b/tests/helper_print-info.bash
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# vim: set ft=sh sw=4 :
+
+# shellcheck disable=SC2154
+
+function print_run_info() {
+    echo "status: ${status}"
+    echo "output: ${output}"
+}
diff --git a/tests/test_version_increment.bats b/tests/test_version_increment.bats
new file mode 100644
index 0000000..2051fa4
--- /dev/null
+++ b/tests/test_version_increment.bats
@@ -0,0 +1,147 @@
+#!/usr/bin/env bats
+# vim: set ft=sh sw=4 :
+
+load helper_print-info
+
+export repo=".tmp_testing/repo"
+
+function init_repo {
+    rm -rf "${repo}" &&
+    mkdir -p "${repo}" &&
+    cd "${repo}" &&
+    git init &&
+    git checkout -b main &&
+    touch README.md &&
+    git add README.md &&
+    git config user.email test@example.com &&
+    git config user.name Tester &&
+    git commit -m "README" &&
+    export GITHUB_REF="refs/heads/main"
+}
+
+@test "fails if no current_version given" {
+    init_repo
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 5 ] &&
+    [[ "$output" = *"Environment variable 'current_version' is unset or empty"* ]]
+}
+
+@test "fails if invalid current_version given" {
+    init_repo
+
+    export current_version=1.3.5-prerelease
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 6 ] &&
+    [[ "$output" = *"Environment variable 'current_version' is not a valid normal version"* ]]
+}
+
+@test "fails if invalid scheme given" {
+    init_repo
+
+    export current_version=1.2.3
+    export INPUT_SCHEME="foover"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 8 ] &&
+    [[ "$output" = *"Value of 'scheme' is not valid"* ]]
+}
+
+@test "fails if invalid increment given" {
+    init_repo
+
+    export current_version=1.2.3
+    export INPUT_INCREMENT="critical"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 7 ] &&
+    [[ "$output" = *"Value of 'increment' is not valid, choose from 'major', 'minor', or 'patch'"* ]]
+}
+
+@test "increments the patch digit correctly (semver)" {
+    init_repo
+
+    export current_version=1.2.3
+    export INPUT_INCREMENT="patch"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=version::1.2.4"* ]]
+}
+
+@test "increments the minor digit correctly (semver)" {
+    init_repo
+
+    export current_version=1.2.3
+    export INPUT_INCREMENT="minor"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=version::1.3.0"* ]]
+}
+
+@test "increments the major digit correctly (semver)" {
+    init_repo
+
+    export current_version=1.2.3
+    export INPUT_INCREMENT="major"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=version::2.0.0"* ]]
+}
+
+@test "increments to a new month (calver)" {
+    init_repo
+
+    export current_version=2020.6.4
+    export INPUT_SCHEME="calver"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=version::$(date +%Y.%-m.1)"* ]]
+}
+
+@test "increments the patch digit within a month (calver)" {
+    init_repo
+
+    export current_version="$(date +%Y.%-m.123)"
+    export INPUT_SCHEME="calver"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=version::$(date +%Y.%-m.124)"* ]]
+}
+
+@test "appends prerelease information if on a branch" {
+    init_repo
+
+    export current_version=1.2.3
+    export GITHUB_REF="refs/heads/super-awesome-feature"
+    export short_ref="$(git rev-parse --short HEAD | sed 's/0*//')"
+
+    run ../../version-increment.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=version::1.2.4-pre.${short_ref}"* ]]
+}
diff --git a/tests/test_version_lookup.bats b/tests/test_version_lookup.bats
new file mode 100644
index 0000000..622bc68
--- /dev/null
+++ b/tests/test_version_lookup.bats
@@ -0,0 +1,115 @@
+#!/usr/bin/env bats
+# vim: set ft=sh sw=4 :
+
+load helper_print-info
+
+export repo=".tmp_testing/repo"
+
+function init_repo {
+    rm -rf "${repo}" &&
+    mkdir -p "${repo}" &&
+    cd "${repo}" &&
+    git init &&
+    touch README.md &&
+    git add README.md &&
+    git config user.email test@example.com &&
+    git config user.name Tester &&
+    git commit -m "README"
+}
+
+@test "fails if invalid scheme given" {
+    init_repo
+
+    export INPUT_SCHEME="foover"
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 8 ] &&
+    [[ "$output" = *"Value of 'scheme' is not valid"* ]]
+}
+
+@test "finds the current normal version" {
+    init_repo
+
+    git tag 0.0.1
+    git tag 0.1.1
+    git tag 0.1.2
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::0.1.2"* ]]
+}
+
+@test "finds the current normal version even if there's a newer pre-release version" {
+    init_repo
+
+    git tag 1.2.300
+    git tag 1.2.301-dev.234
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::1.2.300"* ]]
+}
+
+@test "returns 0.0.0 if no normal version detected" {
+    init_repo
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::0.0.0"* ]]
+}
+
+@test "returns 0.0.0 if no normal version detected even if there's a pre-release version" {
+    init_repo
+
+    git tag 0.0.1-dev.999
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::0.0.0"* ]]
+}
+
+@test "returns a calver if no normal version detected and calver scheme specified" {
+    init_repo
+
+    export INPUT_SCHEME="calver"
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::$(date '+%Y.%-m.0')"* ]]
+}
+
+@test "converts from older calver scheme automatically" {
+    init_repo
+
+    git tag 2020-09-R2
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::2020.9.2"* ]]
+}
+
+@test "strips v from the version" {
+    init_repo
+
+    git tag v3.4.5
+
+    run ../../version-lookup.sh
+
+    print_run_info
+    [ "$status" -eq 0 ] &&
+    [[ "$output" = *"::set-output name=current-version::3.4.5"* ]]
+}
diff --git a/version-increment.sh b/version-increment.sh
new file mode 100755
index 0000000..39309c6
--- /dev/null
+++ b/version-increment.sh
@@ -0,0 +1,93 @@
+#!/bin/bash
+set -euo pipefail
+
+# https://stackoverflow.com/questions/59895/get-the-source-directory-of-a-bash-script-from-within-the-script-itself
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+# shellcheck source=shared.sh
+source "${script_dir}/shared.sh"
+
+if [[ -z "${current_version:-}" ]] ; then
+    echo "🛑 Environment variable 'current_version' is unset or empty" 1>&2
+    exit 5
+fi
+
+if [[ -z "$(echo "${current_version}" | ${grep} -P "${pcre_master_ver}")" ]] ; then
+    echo "🛑 Environment variable 'current_version' is not a valid normal version (M.m.p)" 1>&2
+    exit 6
+fi
+
+increment="${INPUT_INCREMENT:-patch}"
+if [[ "${increment}" != 'patch' && "${increment}" != 'minor' && "${increment}" != 'major' ]] ; then
+    echo "🛑 Value of 'increment' is not valid, choose from 'major', 'minor', or 'patch'" 1>&2
+    exit 7
+fi
+
+scheme="${INPUT_SCHEME:-semver}"
+if [[ "${scheme}" != 'semver' && "${scheme}" != 'calver' ]] ; then
+    echo "🛑 Value of 'scheme' is not valid, choose from 'semver' or 'calver'" 1>&2
+    exit 8
+fi
+
+##==----------------------------------------------------------------------------
+##  Git info - branch names, commit short ref
+
+default_branch='main'
+# if we're _not_ testing, then _actually_ check the origin
+if [[ -z "${BATS_VERSION:-}" ]] ; then
+    default_branch="$(git remote show origin | ${grep} 'HEAD branch' | cut -d ' ' -f 5)"
+fi
+current_ref="${GITHUB_REF:-}"
+git_commit="$(git rev-parse --short HEAD | sed 's/0*//')"  # trim leading zeros, because semver doesn't allow that in
+                                                           # the 'pre-release version' part, but we can't use the + char
+                                                           # to make it 'build metadata' as that's not supported in K8s
+                                                           # labels
+
+##==----------------------------------------------------------------------------
+##  Version increment
+
+# increment the month if needed
+if [[ "${scheme}" == "calver" ]] ; then
+    month="$(date '+%Y.%-m.')"
+    release="${current_version//$month/}"
+    if [[ "${release}" == "${current_version}" ]] ; then
+        current_version="$(date '+%Y.%-m.0')"
+    fi
+fi
+
+# increment the patch digit
+IFS=" " read -r -a version_array <<< "${current_version//./ }"
+if [[ "${increment}" == 'patch' || "${scheme}" == 'calver' ]] ; then
+    (( ++version_array[2] ))
+elif [[ "${increment}" == 'minor' ]] ; then
+    (( ++version_array[1] ))
+    version_array[2]='0'
+elif [[ "${increment}" == 'major' ]] ; then
+    (( ++version_array[0] ))
+    version_array[1]='0'
+    version_array[2]='0'
+fi
+
+new_version="${version_array[0]}.${version_array[1]}.${version_array[2]}"
+
+# check we haven't accidentally forgotten to set scheme to calver
+# TODO: provide an override "I know my version numbers are > 2020, but it's semver!" option
+if [[ "${version_array[0]}" -gt 2020 && "${scheme}" != "calver" ]] ; then
+    echo "🛑 The major version number is greater than 2020, but the scheme is not set to 'calver'" 1>&2
+    exit 11
+fi
+
+# add pre-release info to version if not the default branch
+if [[ "${current_ref}" != "refs/heads/${default_branch}" ]] ; then
+    new_version="${new_version}-pre.${git_commit}"
+fi
+
+if [[ -z "$(echo "${new_version}" | ${grep} -P "${pcre_semver}")" ]] ; then
+    echo "🛑 Version incrementing has failed to produce a semver compliant version" 1>&2
+    echo "ℹ️ See: https://semver.org/spec/v2.0.0.html" 1>&2
+    echo "ℹ️ Failed version string: '${new_version}'" 1>&2
+    exit 12
+fi
+
+echo "ℹ️ The new version is ${new_version}"
+
+echo "::set-output name=version::${new_version}"
diff --git a/version-lookup.sh b/version-lookup.sh
new file mode 100755
index 0000000..ac09baf
--- /dev/null
+++ b/version-lookup.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+set -euo pipefail
+
+# https://stackoverflow.com/questions/59895/get-the-source-directory-of-a-bash-script-from-within-the-script-itself
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+# shellcheck source=shared.sh
+source "${script_dir}/shared.sh"
+
+scheme="${INPUT_SCHEME:-semver}"
+if [[ "${scheme}" != 'semver' && "${scheme}" != 'calver' ]] ; then
+    echo "🛑 Value of 'scheme' is not valid, choose from 'semver' or 'calver'" 1>&2
+    exit 8
+fi
+
+##==----------------------------------------------------------------------------
+##  MacOS compatibility - for local testing
+
+export grep="grep"
+if [[ "$(uname)" == "Darwin" ]] ; then
+    export grep="ggrep"
+    if ! grep --version 1>/dev/null ; then
+        echo "🛑 GNU grep not installed, try brew install coreutils" 1>&2
+        exit 9
+    fi
+fi
+
+##==----------------------------------------------------------------------------
+##  Get tags from GitHub repo
+
+# Skip if testing, otherwise pull tags
+if [[ -z "${BATS_VERSION:-}" ]] ; then
+    git fetch --quiet origin 'refs/tags/*:refs/tags/*'
+fi
+
+##==----------------------------------------------------------------------------
+##  Version parsing
+
+# detect current version - removing "v" from start of tag if it exists
+current_version="$(git tag -l | { ${grep} -P "${pcre_allow_vprefix}" || true; } | sed 's/^v//g' | sort -V --reverse | head -n1)"
+
+# support transition from an old reecetech calver style (yyyy-mm-Rr, where R is the literal `R`, and r is the nth release for the month)
+if [[ -z "${current_version:-}" ]] ; then
+    current_version="$(git tag -l | { ${grep} -P "${pcre_old_calver}" || true; } | sort -V --reverse | head -n1)"
+    if [[ -n "${current_version:-}" ]] ; then
+        # convert - to . and drop leading zeros & the R
+        current_version="$(echo "${current_version}" | sed -r 's/^([0-9]+)-0{0,1}([0-9]+)-R0{0,1}([0-9]+)$/\1.\2.\3/')"
+    fi
+fi
+
+# handle no version detected - start versioning!
+if [[ -z "${current_version:-}" ]] ; then
+    echo "⚠️ No previous release version identified in git tags"
+    # brand new repo! (probably)
+    case "${scheme}" in
+        semver)
+            current_version="0.0.0"
+        ;;
+        calver)
+            current_version="$(date '+%Y.%-m.0')"
+        ;;
+    esac
+fi
+
+echo "ℹ️ The current normal version is ${current_version}"
+
+echo "::set-output name=current-version::${current_version}"