diff --git a/README.md b/README.md
index c38c511..8010e5f 100644
--- a/README.md
+++ b/README.md
@@ -28,3 +28,4 @@ We will welcome all help with open arms!
 
 - [Michael Fellinger](https://github.com/manveru)
 - [Peter Hoeg](https://github.com/peterhoeg)
+- [Vidhvath J](https://github.com/vidhvath28)
diff --git a/crystal2nix b/crystal2nix
new file mode 100644
index 0000000..2246d06
Binary files /dev/null and b/crystal2nix differ
diff --git a/shard.lock b/shard.lock
index 4e55dee..c378083 100644
--- a/shard.lock
+++ b/shard.lock
@@ -8,3 +8,6 @@ shards:
     git: https://github.com/hugopl/version_from_shard.git
     version: 1.2.5
 
+  carbon_smtp_adapter:
+    hg: https://hg.sr.ht/~peterhoeg/dummy
+    version: 0.1.1+hg.commit.4048cd7e156f3d4317e10ebd4e742020c8049310
\ No newline at end of file
diff --git a/shard.yml b/shard.yml
index 1c6257b..db1c628 100644
--- a/shard.yml
+++ b/shard.yml
@@ -22,3 +22,8 @@ development_dependencies:
   spectator:
     gitlab: arctic-fox/spectator
     version: ~> 0.10.5
+
+dependencies:
+  carbon_smtp_adapter:
+    hg: https://hg.sr.ht/~peterhoeg/dummy
+    version: ~> 0.1.1
\ No newline at end of file
diff --git a/shards.nix b/shards.nix
index 728aefb..88f502d 100644
--- a/shards.nix
+++ b/shards.nix
@@ -9,4 +9,13 @@
     rev = "v1.2.5";
     sha256 = "0xizj0q4rd541rwjbx04cjifc2gfx4l5v6q2y7gmd0ndjmkgb8ik";
   };
+  carbon_smtp_adapter = {
+    hg = "https://hg.sr.ht/~peterhoeg/dummy";
+    rev = "v0.1.1";
+    sha256 = "0kdb0k1xzl4yysfmlif7xmr2mnb3y5f3knqr8dy08f3sq9n31x4z";
+
+  }
 }
+
+    
+   
\ No newline at end of file
diff --git a/spec/repo_spec.cr b/spec/repo_spec.cr
index d1e6e8c..c889e98 100644
--- a/spec/repo_spec.cr
+++ b/spec/repo_spec.cr
@@ -1,6 +1,6 @@
 require "./spec_helper"
 
-Spectator.describe Repo do
+Spectator.describe Crystal2Nix::Repo do
   context "commit" do
     let(:with_commit) {
       <<-EOF
@@ -9,8 +9,12 @@ Spectator.describe Repo do
       EOF
     }
 
+    let(:shard) {
+      Crystal2Nix::Shard.from_yaml(with_commit)
+    }
+
     let(:repo) {
-      Crystal2Nix::Repo.new(Crystal2Nix::Shard.from_yaml(with_commit))
+      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
     }
 
     it "should have the commit as revision" do
@@ -26,12 +30,56 @@ Spectator.describe Repo do
       EOF
     }
 
+    let(:shard) {
+      Crystal2Nix::Shard.from_yaml(with_version)
+    }
+
     let(:repo) {
-      Crystal2Nix::Repo.new(Crystal2Nix::Shard.from_yaml(with_version))
+      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
     }
 
     it "should prefix version references with a v" do
       expect(repo.rev).to eq("v0.1.1")
     end
   end
+
+  context "http url" do
+    let(:with_http_url) {
+      <<-EOF
+      http: https://example.com/archive.tar.gz
+      EOF
+    }
+
+    let(:shard) {
+      Crystal2Nix::Shard.from_yaml(with_http_url)
+    }
+
+    let(:repo) {
+      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
+    }
+
+    it "should have the correct url" do
+      expect(repo.url).to eq("https://example.com/archive.tar.gz")
+    end
+  end
+
+  context "git without revision" do
+    let(:without_revision) {
+      <<-EOF
+      git: https://github.com/example/repo.git
+      EOF
+    }
+
+    let(:shard) {
+      Crystal2Nix::Shard.from_yaml(without_revision)
+    }
+
+    let(:repo) {
+      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
+    }
+
+    it "should have the correct url" do
+      expect(repo.url).to eq("https://github.com/example/repo.git")
+    end
+  end
 end
diff --git a/src/repo.cr b/src/repo.cr
index e41a466..17e0ce2 100644
--- a/src/repo.cr
+++ b/src/repo.cr
@@ -1,19 +1,13 @@
 module Crystal2Nix
   class Repo
-    @url : URI
-    getter rev : String
+    property url : String
+    property rev : String?
+    property type : Symbol
 
-    def initialize(entry : Shard)
-      @url = URI.parse(entry.git).normalize
-      @rev = if entry.version =~ /^(?<version>.+)\+git\.commit\.(?<rev>.+)$/
-               $~["rev"]
-             else
-               "v#{entry.version}"
-             end
-    end
-
-    def url : String
-      @url.to_s
+    def initialize(url : String, rev : String? = nil, type : Symbol = :git)
+      @url = url
+      @rev = rev
+      @type = type
     end
   end
 end
diff --git a/src/runner.cr b/src/runner.cr
index 467c918..c98c4ee 100644
--- a/src/runner.cr
+++ b/src/runner.cr
@@ -1,4 +1,4 @@
 require "./crystal2nix"
 require "./cli"
 
-Crystal2Nix::Cli.new.run
+Crystal2Nix::Cli.new.run
\ No newline at end of file
diff --git a/src/worker.cr b/src/worker.cr
index caec6cf..3842f04 100644
--- a/src/worker.cr
+++ b/src/worker.cr
@@ -15,6 +15,9 @@ module Crystal2Nix
             exit 1
           end
           sha256 = ""
+          case 
+          when repo.url.ends_with?(".git")
+          
           args = [
             "--no-deepClone",
             "--url", repo.url,
@@ -24,6 +27,22 @@ module Crystal2Nix
             x.error.each_line { |e| puts e }
             sha256 = PrefetchJSON.from_json(x.output).sha256
           end
+        when repo.url.starts_with?("hg://") || repo.url.ends_with?(".hg")
+          args = [
+            "--url", repo.url,
+            "--rev", repo.rev,
+          ]
+          Process.run("nix-prefetch-hg", args: args) do |x|
+            x.error.each_line { |e| puts e }
+            sha256 = PrefetchJSON.from_json(x.output).sha256
+          end
+        when repo.url.ends_with?(".fossil")
+          STDERR.puts "Fossil repositories are not supported."
+          next
+        else
+          STDERR.puts "Unknown repository type for #{repo.url}"
+          next
+        end
 
           file.puts %(  #{key} = {)
           file.puts %(    url = "#{repo.url}";)
@@ -35,4 +54,4 @@ module Crystal2Nix
       end
     end
   end
-end
+end
\ No newline at end of file