Improve Github workflows and add a "lint" badge to README.

Github workflows will now only run on pull requests and on master. Pushes to other branches will no longer trigger the running of Github actions.

.github/workflows/lint.yml

@@ -1,6 +1,10 @@
 name: Lint
 
-on: [ push, pull_request ]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
 
 jobs:
   test:
@@ -17,4 +21,4 @@ jobs:
       - name: Install dependencies
         run: bundle install
       - name: Run Rubocop
-        run: bundle exec rubocop
+        run: bin/lint --no-fix

.github/workflows/test.yml

@@ -1,6 +1,10 @@
 name: Test
 
-on: [ push, pull_request ]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
 
 jobs:
   test:

README.md

@@ -2,7 +2,8 @@
 # FillablePDF
 
 [![Gem Version](https://badge.fury.io/rb/fillable-pdf.svg)](https://rubygems.org/gems/fillable-pdf)
-[![Test Status](https://github.com/vkononov/fillable-pdf/actions/workflows/test.yml/badge.svg)](https://github.com/vkononov/fillable-pdf/actions)
+[![Lint Status](https://github.com/vkononov/fillable-pdf/actions/workflows/lint.yml/badge.svg)](https://github.com/vkononov/fillable-pdf/actions/workflows/lint.yml)
+[![Test Status](https://github.com/vkononov/fillable-pdf/actions/workflows/test.yml/badge.svg)](https://github.com/vkononov/fillable-pdf/actions/workflows/test.yml)
 
 FillablePDF is an extremely simple and lightweight utility that bridges iText and Ruby in order to fill out fillable PDF forms or extract field values from previously filled out PDF forms.
 

bin/lint

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+RESET_COLOR='\033[0m'
+HIGHLIGHT_COLOR='\033[0;35m'
+SUCCESS_COLOR='\033[0;32m'
+ERROR_COLOR='\033[0;31m'
+
+clear
+
+# linter configuration paths
+RUBOCOP_CONFIG=.rubocop.yml
+
+# Checking for existence of configuration files...
+test -e ${RUBOCOP_CONFIG} || { echo -e "${ERROR_COLOR}"ERROR: ${RUBOCOP_CONFIG} not found."${RESET_COLOR}"; exit 1; }
+
+# Running linters
+echo -e "${HIGHLIGHT_COLOR}"Linting Ruby on Rails using RuboCop..."${RESET_COLOR}"
+if [[ "$1" == "--no-fix" ]]; then
+        bundle exec rubocop || { valid=false; }
+else
+        bundle exec rubocop --autocorrect-all  || { valid=false; }
+fi
+
+# Printing summary
+if [[ "$valid" == false ]]; then
+  echo -e "${ERROR_COLOR}"ERROR: Lint errors have been found in your code."${RESET_COLOR}"
+  exit 1
+else
+  echo -e "${SUCCESS_COLOR}"SUCCESS: All lints have completed without errors."${RESET_COLOR}"
+fi