WIP translators: init gradle2nix

flake.lock

@@ -84,6 +84,22 @@
         "type": "github"
       }
     },
+    "gradle2nix": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1651167340,
+        "narHash": "sha256-U+YBGk/c2jjp6uExGiyrO8+vGpLqeRu6BlhvNDzbfJo=",
+        "owner": "kranzes",
+        "repo": "gradle2nix",
+        "rev": "5acbd615af9f26bbf11e5dd2b620c4d3cf06e01a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kranzes",
+        "repo": "gradle2nix",
+        "type": "github"
+      }
+    },
     "mach-nix": {
       "flake": false,
       "locked": {
@@ -176,6 +192,7 @@
         "crane": "crane",
         "flake-utils-pre-commit": "flake-utils-pre-commit",
         "gomod2nix": "gomod2nix",
+        "gradle2nix": "gradle2nix",
         "mach-nix": "mach-nix",
         "nixpkgs": "nixpkgs",
         "node2nix": "node2nix",

flake.nix

@@ -44,6 +44,12 @@
       url = "github:ipetkov/crane";
       flake = false;
     };
+
+    # required for builder/translator java/gradle2nix
+    gradle2nix = {
+      url = "github:kranzes/gradle2nix";
+      flake = false;
+    };
   };
 
   outputs = {

src/translators/java/impure/gradle2nix/default.nix

@@ -0,0 +1,77 @@
+{
+  dlib,
+  lib,
+}: {
+  # A derivation which outputs a single executable at `$out`.
+  # The executable will be called by dream2nix for translation
+  # The input format is specified in /specifications/translator-call-example.json.
+  # The first arg `$1` will be a json file containing the input parameters
+  # like defined in /src/specifications/translator-call-example.json and the
+  # additional arguments required according to extraArgs
+  #
+  # The program is expected to create a file at the location specified
+  # by the input parameter `outFile`.
+  # The output file must contain the dream lock data encoded as json.
+  # See /src/specifications/dream-lock-example.json
+  translateBin = {
+    # dream2nix utils
+    utils,
+    # nixpkgs dependenies
+    bash,
+    jq,
+    writeScriptBin,
+    callPackage,
+    ...
+  }:
+    utils.writePureShellScript
+    [
+      bash
+      coreutils
+      jq
+      (callPackage externalSources.gradle2nix {})
+    ]
+    ''
+      # accroding to the spec, the translator reads the input from a json file
+      jsonInput=$1
+
+      # read the json input
+      outputFile=$(${jq}/bin/jq '.outputFile' -c -r $jsonInput)
+      source=$(${jq}/bin/jq '.source' -c -r $jsonInput)
+      relPath=$(${jq}/bin/jq '.project.relPath' -c -r $jsonInput)
+
+      tmpDir=$(mktemp -d)
+      gradle2nix --project $source --out-dir $tmpDir
+
+      somehow format the json file created by gradle2nix $tmpDir/gradle-env.json > $outputFile
+
+      # TODO:
+      # read input files/dirs and produce a json file at $outputFile
+      # containing the dream lock similar to /src/specifications/dream-lock-example.json
+    '';
+
+  # If the translator requires additional arguments, specify them here.
+  # When users run the CLI, they will be asked to specify these arguments.
+  # There are only two types of arguments:
+  #   - string argument (type = "argument")
+  #   - boolean flag (type = "flag")
+  # String arguments contain a default value and examples. Flags do not.
+  extraArgs = {
+    # Example: boolean option
+    # Flags always default to 'false' if not specified by the user
+    noDev = {
+      description = "Exclude dev dependencies";
+      type = "flag";
+    };
+
+    # Example: string option
+    theAnswer = {
+      default = "42";
+      description = "The Answer to the Ultimate Question of Life";
+      examples = [
+        "0"
+        "1234"
+      ];
+      type = "argument";
+    };
+  };
+}