Add initial codebase

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}"