feat: add support for fetch particular branch/file, checkout specific…

… file, fetch all

.ameba.yml

@@ -0,0 +1,2 @@
+ Lint/NotNil:
+   Enabled: false

shard.yml

@@ -1,5 +1,5 @@
 name: git-repository
-version: 1.3.0
+version: 1.3.1
 
 dependencies:
   connect-proxy:

src/git-repository/commands.cr

@@ -25,10 +25,18 @@ struct GitRepository::Commands
     run_git("fetch", {"--depth", "1", "origin", branch})
   end
 
+  def fetch_all(branch : String)
+    run_git("fetch", {"origin", branch})
+  end
+
   def checkout(branch : String)
     run_git("checkout", {branch})
   end
 
+  def checkout(branch : String, file : String)
+    run_git("checkout", {branch, "--", file})
+  end
+
   def reset
     run_git("reset", {"--hard"})
     run_git("clean", {"-fd", "-fx"})

src/git-repository/generic.cr

@@ -125,4 +125,24 @@ class GitRepository::Generic < GitRepository::Interface
       git.commits(depth: 1).first
     end
   end
+
+  def fetch_commit(branch : String, commit : String, source_file : String, download_to_path : String | Path) : Commit
+    download_to = download_to_path.to_s
+
+    # download the commit
+    create_temp_folder do |temp_folder|
+      git = Commands.new(temp_folder)
+      git.init
+      git.add_origin @repository
+      git.fetch_all branch             # git fetch origin branch
+      git.checkout branch              # git checkout branch or FETCH_HEAD
+      git.checkout commit, source_file # git checkout FETCH_HEAD or sha1 -- source_file
+
+      move_into_place(temp_folder, download_to)
+
+      # grab the current commit hash
+      git.path = download_to
+      git.commits(depth: 1).first
+    end
+  end
 end

src/git-repository/interface.cr

@@ -34,7 +34,7 @@ abstract class GitRepository::Interface
       temp_folder
     end
 
-    def create_temp_folder
+    def create_temp_folder(&)
       temp_folder = create_temp_folder
       begin
         yield temp_folder