Fixes Posix Spawn and adds CI

.github/test.yml

@@ -0,0 +1,23 @@
+---
+name: test
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        entry:
+          - { ruby: '2.7' }
+          - { ruby: '3.0' }
+          - { ruby: '3.1' }
+          - { ruby: '3.2' }
+    name: test (${{ matrix.entry.ruby }})
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.entry.ruby }}
+      - run: bundle install --jobs=3 --retry=3 --path=vendor/bundle
+      - run: bundle exec rake spec
+        continue-on-error: ${{ matrix.entry.allowed-failure }}

README.md

@@ -1,5 +1,8 @@
 # Last Modified At Plugin
 
+![Rake Status](https://github.com/gjtorikian/jekyll-last-modified-at/actions/workflows/test.yml/badge.svg)
+
+
 A liquid tag for Jekyll to indicate the last time a file was modified.
 
 This plugin determines a page's last modified date by checking the last Git commit date of source files. In the event Git is not available, the file's `mtime` is used.

jekyll-last-modified-at.gemspec

@@ -11,7 +11,6 @@ Gem::Specification.new do |s|
   s.files                 = Dir['lib/**/*.rb']
 
   s.add_dependency 'jekyll', '>= 3.7', ' < 5.0'
-  s.add_dependency 'posix-spawn', '~> 0.3.9'
 
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec', '~> 3.4'

lib/jekyll-last-modified-at/executor.rb

@@ -1,36 +1,16 @@
 # frozen_string_literal: true
 
-require 'posix/spawn'
+require 'open3'
 
 module Jekyll
   module LastModifiedAt
     module Executor
-      extend POSIX::Spawn
 
       def self.sh(*args)
-        r, w = IO.pipe
-        e, eo = IO.pipe
-        pid = spawn(*args,
-                    :out => w, r => :close,
-                    :err => eo, e => :close)
-
-        if pid.positive?
-          w.close
-          eo.close
-          out = r.read
-          err = e.read
-          ::Process.waitpid(pid)
-          "#{out} #{err}".strip if out
-        end
-      ensure
-        [r, w, e, eo].each do |io|
-          begin
-                                   io.close
-          rescue StandardError
-            nil
-                                 end
-        end
+        stdout_str, stderr_str, status = Open3.capture3(*args)
+        return "#{stdout_str} #{stderr_str}".strip if status.success?
       end
+
     end
   end
 end