Add validate-semver

Makefile

@@ -2,7 +2,7 @@
 
 BIN ?= validate
 PREFIX ?= /usr/local
-CMDS = dir-exists enum file-exists
+CMDS = dir-exists enum file-exists semver
 
 current_dir := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 

bpkg.json

@@ -2,7 +2,7 @@
   "name": "sh-validators",
   "version": "v0.1.0",
   "description": "A set of scripts to validate inputs in GitHub Actions workflows",
-  "scripts": ["validate-dir-exists", "validate-enum", "validate-file-exists"],
+  "scripts": ["validate-dir-exists", "validate-enum", "validate-file-exists", "validate-semver"],
   "install": "make install",
   "global": "true"
 }

lib/validate-semver.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+validate_semver() {
+  param_key="$1"
+  param_val="$2"
+  semver_regex="^[0-9]\+\(\.[0-9]\+\)\{0,2\}\(-[0-9A-Za-z-]\+\(\.[0-9A-Za-z-]\+\)*\)\?\(\+[0-9A-Za-z-]\+\(\.[0-9A-Za-z-]\+\)*\)\?$"
+  if ! expr "${param_val}" : "${semver_regex}" >/dev/null; then
+    msg="\"${param_key}\" parameter is invalid. \"${param_val}\" is not a valid semver."
+    echo "::error title=Invalid parameter::${msg}"
+    exit 1
+  fi
+}
+
+## export
+if [[ ${BASH_SOURCE[0]} != $0 ]]; then
+  export -f validate_semver
+else
+  validate_semver "${@}"
+  exit $?
+fi

validate-semver

@@ -0,0 +1 @@
+lib/validate-semver.sh