ruby-git · jcouball · Jul 2, 2025 · Jul 2, 2025
diff --git a/README.md b/README.md
@@ -18,6 +18,7 @@
 - [Major Objects](#major-objects)
 - [Errors Raised By This Gem](#errors-raised-by-this-gem)
 - [Specifying And Handling Timeouts](#specifying-and-handling-timeouts)
+- [Deprecations](#deprecations)
 - [Examples](#examples)
 - [Ruby version support policy](#ruby-version-support-policy)
 - [License](#license)
@@ -202,6 +203,24 @@ rescue Git::TimeoutError => e
 end
 ```
 
+## Deprecations
+
+This gem uses ActiveSupport's deprecation mechanism to report deprecation warnings.
+
+You can silence deprecation warnings by adding this line to your source code:
+
+```ruby
+Git::Deprecation.behavior = :silence
+```
+
+See [the Active Support Deprecation
+documentation](https://api.rubyonrails.org/classes/ActiveSupport/Deprecation.html)
+for more details.
+
+If deprecation warnings are silenced, you should reenable them before upgrading the
+git gem to the next major version. This will make it easier to identify changes
+needed for the upgrade.
+
 ## Examples
 
 Here are a bunch of examples of how to use the Ruby/Git package.

diff --git a/lib/git/log.rb b/lib/git/log.rb
@@ -6,26 +6,76 @@ module Git
   #
   # @example The last (default number) of commits
   #   git = Git.open('.')
-  #   Git::Log.new(git) #=> Enumerable of the last 30 commits
+  #   Git::Log.new(git).execute #=> Enumerable of the last 30 commits
   #
   # @example The last n commits
-  #   Git::Log.new(git).max_commits(50) #=> Enumerable of last 50 commits
+  #   Git::Log.new(git).max_commits(50).execute #=> Enumerable of last 50 commits
   #
   # @example All commits returned by `git log`
-  #   Git::Log.new(git).max_count(:all) #=> Enumerable of all commits
+  #   Git::Log.new(git).max_count(:all).execute #=> Enumerable of all commits
   #
   # @example All commits that match complex criteria
   #   Git::Log.new(git)
   #     .max_count(:all)
   #     .object('README.md')
   #     .since('10 years ago')
   #     .between('v1.0.7', 'HEAD')
+  #     .execute
   #
   # @api public
   #
   class Log
     include Enumerable
 
+    # An immutable collection of commits returned by Git::Log#execute
+    #
+    # This object is an Enumerable that contains Git::Object::Commit objects.
+    # It provides methods to access the commit data without executing any
+    # further git commands.
+    #
+    # @api public
+    class Result
+      include Enumerable
+
+      # @private
+      def initialize(commits)
+        @commits = commits
+      end
+
+      # @return [Integer] the number of commits in the result set
+      def size
+        @commits.size
+      end
+
+      # Iterates over each commit in the result set
+      #
+      # @yield [Git::Object::Commit]
+      def each(&block)
+        @commits.each(&block)
+      end
+
+      # @return [Git::Object::Commit, nil] the first commit in the result set
+      def first
+        @commits.first
+      end
+
+      # @return [Git::Object::Commit, nil] the last commit in the result set
+      def last
+        @commits.last
+      end
+
+      # @param index [Integer] the index of the commit to return
+      # @return [Git::Object::Commit, nil] the commit at the given index
+      def [](index)
+        @commits[index]
+      end
+
+      # @return [String] a string representation of the log
+      def to_s
+        map { |c| c.to_s }.join("\n")
+      end
+    end
+
     # Create a new Git::Log object
     #
     # @example
@@ -44,6 +94,25 @@ def initialize(base, max_count = 30)
       max_count(max_count)
     end
 
+    # Executes the git log command and returns an immutable result object.
+    #
+    # This is the preferred way to get log data. It separates the query
+    # building from the execution, making the API more predictable.
+    #
+    # @example
+    #   query = g.log.since('2 weeks ago').author('Scott')
+    #   results = query.execute
+    #   puts "Found #{results.size} commits"
+    #   results.each do |commit|
+    #     # ...
+    #   end
+    #
+    # @return [Git::Log::Result] an object containing the log results
+    def execute
+      run_log
+      Result.new(@commits)
+    end
+
     # The maximum number of commits to return
     #
     # @example All commits returned by `git log`
@@ -140,39 +209,50 @@ def merges
     end
 
     def to_s
-      self.map { |c| c.to_s }.join("\n")
+      deprecate_method(__method__)
+      check_log
+      @commits.map { |c| c.to_s }.join("\n")
     end
 
     # forces git log to run
 
     def size
+      deprecate_method(__method__)
       check_log
       @commits.size rescue nil
     end
 
     def each(&block)
+      deprecate_method(__method__)
       check_log
       @commits.each(&block)
     end
 
     def first
+      deprecate_method(__method__)
       check_log
       @commits.first rescue nil
     end
 
     def last
+      deprecate_method(__method__)
       check_log
       @commits.last rescue nil
     end
 
     def [](index)
+      deprecate_method(__method__)
       check_log
       @commits[index] rescue nil
     end
 
 
     private
 
+      def deprecate_method(method_name)
+        Git::Deprecation.warn("Calling Git::Log##{method_name} is deprecated and will be removed in a future version. Call #execute and then ##{method_name} on the result object.")
+      end
+
       def dirty_log
         @dirty_flag = true
       end

diff --git a/tests/test_helper.rb b/tests/test_helper.rb
@@ -12,6 +12,9 @@
 $stdout.sync = true
 $stderr.sync = true
 
+# Silence deprecation warnings during tests
+Git::Deprecation.behavior = :silence
+
 class Test::Unit::TestCase
 
   TEST_ROOT = File.expand_path(__dir__)

diff --git a/tests/units/test_log_execute.rb b/tests/units/test_log_execute.rb
@@ -0,0 +1,154 @@
+# frozen_string_literal: true
+
+require 'logger'
+require 'test_helper'
+
+# Tests for the Git::Log#execute method
+class TestLogExecute < Test::Unit::TestCase
+  def setup
+    clone_working_repo
+    #@git = Git.open(@wdir, :log => Logger.new(STDOUT))
+    @git = Git.open(@wdir)
+  end
+
+  def test_log_max_count_default
+    assert_equal(30, @git.log.execute.size)
+  end
+
+  # In these tests, note that @git.log(n) is equivalent to @git.log.max_count(n)
+  def test_log_max_count_20
+    assert_equal(20, @git.log(20).execute.size)
+    assert_equal(20, @git.log.max_count(20).execute.size)
+  end
+
+  def test_log_max_count_nil
+    assert_equal(72, @git.log(nil).execute.size)
+    assert_equal(72, @git.log.max_count(nil).execute.size)
+  end
+
+  def test_log_max_count_all
+    assert_equal(72, @git.log(:all).execute.size)
+    assert_equal(72, @git.log.max_count(:all).execute.size)
+  end
+
+  # Note that @git.log.all does not control the number of commits returned. For that,
+  # use @git.log.max_count(n)
+  def test_log_all
+    assert_equal(72, @git.log(100).execute.size)
+    assert_equal(76, @git.log(100).all.execute.size)
+  end
+
+  def test_log_non_integer_count
+    assert_raises(ArgumentError) { @git.log('foo').execute }
+  end
+
+  def test_get_first_and_last_entries
+    log = @git.log.execute
+    assert(log.first.is_a?(Git::Object::Commit))
+    assert_equal('46abbf07e3c564c723c7c039a43ab3a39e5d02dd', log.first.objectish)
+
+    assert(log.last.is_a?(Git::Object::Commit))
+    assert_equal('b03003311ad3fa368b475df58390353868e13c91', log.last.objectish)
+  end
+
+  def test_get_log_entries
+    assert_equal(30, @git.log.execute.size)
+    assert_equal(50, @git.log(50).execute.size)
+    assert_equal(10, @git.log(10).execute.size)
+  end
+
+  def test_get_log_to_s
+    log = @git.log.execute
+    assert_equal(log.to_s.split("\n").first, log.first.sha)
+  end
+
+  def test_log_skip
+    three1 = @git.log(3).execute.to_a[-1]
+    three2 = @git.log(2).skip(1).execute.to_a[-1]
+    three3 = @git.log(1).skip(2).execute.to_a[-1]
+    assert_equal(three2.sha, three3.sha)
+    assert_equal(three1.sha, three2.sha)
+  end
+
+  def test_get_log_since
+    l = @git.log.since("2 seconds ago").execute
+    assert_equal(0, l.size)
+
+    l = @git.log.since("#{Date.today.year - 2006} years ago").execute
+    assert_equal(30, l.size)
+  end
+
+  def test_get_log_grep
+    l = @git.log.grep("search").execute
+    assert_equal(2, l.size)
+  end
+
+  def test_get_log_author
+    l = @git.log(5).author("chacon").execute
+    assert_equal(5, l.size)
+    l = @git.log(5).author("lazySusan").execute
+    assert_equal(0, l.size)
+  end
+
+  def test_get_log_since_file
+    l = @git.log.path('example.txt').execute
+    assert_equal(30, l.size)
+
+    l = @git.log.between('v2.5', 'test').path('example.txt').execute
+    assert_equal(1, l.size)
+  end
+
+  def test_get_log_path
+    log = @git.log.path('example.txt').execute
+    assert_equal(30, log.size)
+    log = @git.log.path('example*').execute
+    assert_equal(30, log.size)
+    log = @git.log.path(['example.txt','scott/text.txt']).execute
+    assert_equal(30, log.size)
+  end
+
+  def test_log_file_noexist
+    assert_raise Git::FailedError do
+      @git.log.object('no-exist.txt').execute
+    end
+  end
+
+  def test_log_with_empty_commit_message
+    Dir.mktmpdir do |dir|
+      git = Git.init(dir)
+      expected_message = 'message'
+      git.commit(expected_message, { allow_empty: true })
+      git.commit('', { allow_empty: true, allow_empty_message: true })
+      log = git.log.execute
+      assert_equal(2, log.to_a.size)
+      assert_equal('', log[0].message)
+      assert_equal(expected_message, log[1].message)
+    end
+  end
+
+  def test_log_cherry
+    l = @git.log.between( 'master', 'cherry').cherry.execute
+    assert_equal( 1, l.size )
+  end
+
+  def test_log_merges
+    expected_command_line = ['log', '--max-count=30', '--no-color', '--pretty=raw', '--merges', {chdir: nil}]
+    assert_command_line_eq(expected_command_line) { |git| git.log.merges.execute }
+  end
+
+  def test_execute_returns_immutable_results
+    log_query = @git.log(10)
+    initial_results = log_query.execute
+    assert_equal(10, initial_results.size)
+
+    # Modify the original query object
+    log_query.max_count(5)
+    new_results = log_query.execute
+
+    # The initial result set should not have changed
+    assert_equal(10, initial_results.size)
+
+    # The new result set should reflect the change
+    assert_equal(5, new_results.size)
+  end
+end