Check badges in README.md (#53)

* Check badges in README.md

Author: Denis-Averin

.github/workflows/check-badges.yml

@@ -0,0 +1,17 @@
+name: Check badges in README.md
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Check badges in README.md
+      run: ./scripts/check-badges.bash "README.md"

scripts/check-badges.bash

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -euo pipefail
+
+readme_file=$1
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+
+pushd "${SCRIPT_DIR}/.."
+
+grep -oP '[^/]+\.yml(?=/badge.svg)' "${readme_file}" || (>&2 echo "No badges in ${readme_file}" ; exit 1) | while read -r workflow_file; do
+    path_to_workflow=".github/workflows/${workflow_file}"
+    if [ ! -e "${path_to_workflow}" ]
+    then
+        >&2 echo "Error, workflow does not exist \"${path_to_workflow}\""
+        exit 1
+    fi
+done
+
+grep -oP '[^/]+\.yml/badge.svg(?!\?branch=main)' "${readme_file}" || echo | while read -r badge_without_branch; do
+    if [ -z "${badge_without_branch}" ]; then continue; fi
+    >&2 echo "Badge without branch \"${badge_without_branch}\""
+    exit 1
+done
+
+popd