Remove dependence on keepachangelog

Gemfile.lock

@@ -2,6 +2,7 @@ PATH
   remote: .
   specs:
     reissue (0.1.1)
+      kramdown
       rake
 
 GEM
@@ -17,6 +18,8 @@ GEM
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.7.2)
+    kramdown (2.4.0)
+      rexml
     language_server-protocol (3.17.0.3)
     lint_roller (1.1.0)
     minitest (5.23.1)

lib/reissue.rb

@@ -3,7 +3,6 @@
 require_relative "reissue/version"
 require_relative "reissue/version_updater"
 require_relative "reissue/changelog_updater"
-require_relative "reissue/parser"
 
 # Reissue is a module that provides functionality for updating version numbers and changelogs.
 module Reissue

lib/reissue/changelog_updater.rb

@@ -1,4 +1,5 @@
-require "keepachangelog"
+require "reissue/parser"
+require "reissue/printer"
 
 module Reissue
   # Updates the changelog file with new versions and changes.
@@ -23,14 +24,14 @@ def call(version, date: "Unreleased", changes: {}, changelog_file: @changelog_fi
     end
 
     def finalize(date: Date.today, changelog_file: @changelog_file)
-      @changelog = Keepachangelog::MarkdownParser.parse(File.read(changelog_file))
+      @changelog = Parser.parse(File.read(changelog_file))
       # find the highest version number and if it is unreleased, update the date
-      version = changelog["versions"].keys.max
-      version_date = changelog.dig("versions", version, "date")
+      version = changelog["versions"].max_by { |v| Gem::Version.new(v["version"]) }
+      version_date = version["date"]
       if version_date.nil? || version_date == "Unreleased"
-        updated = changelog["versions"].delete(version)
-        new_version = version.sub(/\s-.*/, "")
-        changelog["versions"][new_version] = updated.merge("date" => date)
+        changelog["versions"].find do |v|
+          v["version"] == version["version"]
+        end["date"] = date
       end
       write(changelog_file)
       changelog
@@ -42,20 +43,17 @@ def finalize(date: Date.today, changelog_file: @changelog_file)
     # @param date [String] The release date (default: "Unreleased").
     # @param changes [Hash] The changes for the version (default: {}).
     def update(version, date: "Unreleased", changes: {})
-      @changelog = Keepachangelog::MarkdownParser.parse(File.read(@changelog_file))
+      @changelog = Parser.parse(File.read(@changelog_file))
 
-      changelog["versions"][version] = {"date" => date, "changes" => changes}
-      changes.each do |section, change|
-        changelog["versions"][version]["changes"][section] = change
-      end
+      changelog["versions"].unshift({"version" => version, "date" => date, "changes" => changes})
       changelog
     end
 
     # Returns the string representation of the changelog.
     #
     # @return [String] The Markdown string representation of the changelog.
     def to_s
-      Keepachangelog::MarkdownPrinter.new(changelog["versions"]).to_s
+      Printer.new(changelog).to_s
     end
 
     # Writes the changelog to the specified file.

lib/reissue/printer.rb

@@ -0,0 +1,47 @@
+require "kramdown"
+
+module Reissue
+  class Printer
+    def initialize(changelog)
+      @changelog = changelog
+      @title = @changelog["title"]
+      @preamble = @changelog["preamble"]
+      @versions = versions
+    end
+
+    def template = <<~MARKDOWN
+      # #{@title}
+
+      #{@preamble}
+
+      #{@versions}
+    MARKDOWN
+
+    def to_s
+      Kramdown::Document.new(template).to_kramdown
+    end
+
+    private
+
+    def versions
+      @changelog["versions"].map do |data|
+        version = data["version"]
+        date = data["date"]
+        changes = data.fetch("changes") do
+          {}
+        end
+        <<~MARKDOWN
+          ## #{version} - #{date}
+          #{changes.map { |section, changes| format_section(section, changes) }.join("\n")}
+        MARKDOWN
+      end.join("\n")
+    end
+
+    def format_section(section, changes)
+      <<~MARKDOWN
+        ### #{section}
+        #{changes.map { |change| "- #{change}" }.join("\n")}
+      MARKDOWN
+    end
+  end
+end

reissue.gemspec

@@ -23,4 +23,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "rake"
+  spec.add_dependency "kramdown"
 end