From 4202b95076810567ac6a3bacb3f8f2446148df2c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rapha=C3=ABl=20Pinson?= <raphael.pinson@camptocamp.com>
Date: Tue, 4 Aug 2015 16:03:13 +0200
Subject: [PATCH] Add --base option

---
 README.md                                             | 11 +++++++++++
 .../generator/generator_generation.rb                 |  2 ++
 lib/github_changelog_generator/parser.rb              |  4 ++++
 3 files changed, 17 insertions(+)

diff --git a/README.md b/README.md
index 5b44191..29e36ed 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,17 @@ So, if you got error like this:
 
 It's time to create this token or wait for 1 hour before GitHub reset the counter for your IP.
 
+
+## Migrating from a manual changelog
+
+Knowing how dedicated you are to your project, you probably haven't been waiting for github-changelog-generator to keep a changelog,
+but you most likely wouln't like to have to open issues and PRs for all past features listed in your historic changelog.
+
+That's where `--base` comes handy. This option lets you pass a static changelog to be appended at the end of the generated entries.
+
+If you have a `HISTORY.md` file in your project, it will automatically be picked as the static historical changelog and appended.
+
+
 ##Features and advantages of this project
 - Generate canonical, neat change log file, followed by [basic change log guidelines](http://keepachangelog.com/) :gem:
 - Possible to generate **Unreleased** changes (closed issues that have not released yet) :dizzy:
diff --git a/lib/github_changelog_generator/generator/generator_generation.rb b/lib/github_changelog_generator/generator/generator_generation.rb
index 7e8f7a2..a3dc986 100644
--- a/lib/github_changelog_generator/generator/generator_generation.rb
+++ b/lib/github_changelog_generator/generator/generator_generation.rb
@@ -16,6 +16,8 @@ module GitHubChangelogGenerator
         log += generate_log_for_all_tags
       end
 
+      log += File.read(@options[:base]) if File.file?(@options[:base])
+
       log += "\n\n\\* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*"
       @log = log
     end
diff --git a/lib/github_changelog_generator/parser.rb b/lib/github_changelog_generator/parser.rb
index ff1b6f9..72dc79e 100644
--- a/lib/github_changelog_generator/parser.rb
+++ b/lib/github_changelog_generator/parser.rb
@@ -50,6 +50,9 @@ module GitHubChangelogGenerator
         opts.on("-o", "--output [NAME]", "Output file. Default is CHANGELOG.md") do |last|
           options[:output] = last
         end
+        opts.on("-b", "--base [NAME]", "Optional base file to append generated changes to.") do |last|
+          options[:base] = last
+        end
         opts.on("--bugs-label [LABEL]", "Setup custom label for bug-fixes section. Default is \"**Fixed bugs:**""") do |v|
           options[:bug_prefix] = v
         end
@@ -153,6 +156,7 @@ module GitHubChangelogGenerator
         tag2: nil,
         date_format: "%Y-%m-%d",
         output: "CHANGELOG.md",
+        base: "HISTORY.md",
         issues: true,
         add_issues_wo_labels: true,
         add_pr_wo_labels: true,