1 files changed, 27 insertions, 0 deletions
diff --git a/pkgs/development/compilers/mint/crystal2nix.cr b/pkgs/development/compilers/mint/crystal2nix.cr
new file mode 100644
index 000000000000..2ec8c92be3fb
--- /dev/null
+++ b/pkgs/development/compilers/mint/crystal2nix.cr
@@ -0,0 +1,27 @@
+require "yaml"
+
+File.open "shards.nix", "w+" do |file|
+  file.puts "{"
+  yaml = YAML.parse(File.read("shard.lock"))
+  yaml["shards"].each do |key, value|
+    file.puts "  #{key} = {"
+    file.puts %(    url = "https://github.com/#{value["github"]}";)
+    if value["commit"]?
+      file.puts %(    rev = "#{value["commit"]}";)
+    else
+      url = "https://github.com/#{value["github"]}"
+      ref = "v#{value["version"]}"
+
+      puts "git ls-remote #{url} #{ref}"
+      Process.run("git", args: ["ls-remote", url, ref]) do |x|
+        x.error.each_line { |e| puts e }
+        x.output.each_line { |o| value.as_h["commit"] = o.split("\t")[0] }
+      end
+
+      file.puts %(    rev = "#{value["commit"]};)
+    end
+
+    file.puts "  };"
+  end
+  file.puts "}"
+end