feat: add license extraction for nodejs and rust

examples/nodejs_prettier/flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    dream2nix.url = "github:nix-community/dream2nix";
+    dream2nix.url = "path:../..";
     src.url = "github:prettier/prettier/2.4.1";
     src.flake = false;
   };

examples/rust_ripgrep/flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    dream2nix.url = "github:nix-community/dream2nix";
+    dream2nix.url = "path:../..";
     src.url = "github:BurntSushi/ripgrep/13.0.0";
     src.flake = false;
   };

src/lib/default.nix

@@ -34,6 +34,7 @@
       traceJ
       modules
       warnIfIfd
+      parseSpdxId
       ;
 
     inherit
@@ -322,5 +323,21 @@
     (ifdWarningEnabled && module.type == "ifd")
     (ifdWarnMsg module)
     val;
+
+  idToLicenseKey =
+    l.mapAttrs'
+    (n: v: l.nameValuePair (l.toLower (v.spdxId or v.fullName or n)) n)
+    l.licenses;
+  # Parses a string like "Unlicense OR MIT" to `["unlicense" "mit"]`
+  # TODO: this does not parse `AND` or `WITH` or paranthesis, so it is
+  # pretty hacky in how it works. But for most cases this should be okay.
+  parseSpdxId = _id: let
+    # some spdx ids might have paranthesis around them
+    id = l.removePrefix "(" (l.removeSuffix ")" _id);
+    licenseStrings = l.map l.toLower (l.splitString " OR " id);
+    _licenses = l.map (string: idToLicenseKey.${string} or null) licenseStrings;
+    licenses = l.filter (license: license != null) _licenses;
+  in
+    licenses;
 in
   dlib

src/subsystems/nodejs/builders/granular/default.nix

@@ -216,6 +216,10 @@
 
         inherit pname;
 
+        meta = {
+          licenses = l.map (name: l.licenses.${name}) subsystemAttrs.licenses;
+        };
+
         passthru.dependencies = passthruDeps;
 
         passthru.devShell = import ./devShell.nix {

src/subsystems/nodejs/translators/package-lock/default.nix

@@ -170,7 +170,10 @@
 
       subsystemName = "nodejs";
 
-      subsystemAttrs = {nodejsVersion = b.toString args.nodejs;};
+      subsystemAttrs = {
+        nodejsVersion = b.toString args.nodejs;
+        licenses = dlib.parseSpdxId (packageJson.license or "");
+      };
 
       # functions
       serializePackages = inputData: let

src/subsystems/nodejs/translators/yarn-lock/default.nix

@@ -140,7 +140,10 @@
 
       subsystemName = "nodejs";
 
-      subsystemAttrs = {nodejsVersion = b.toString args.nodejs;};
+      subsystemAttrs = {
+        nodejsVersion = b.toString args.nodejs;
+        licenses = dlib.parseSpdxId (packageJson.license or "");
+      };
 
       keys = {
         yarnName = rawObj: finalObj:

src/subsystems/rust/builders/build-rust-package/default.nix

@@ -3,6 +3,7 @@
 
   build = {
     lib,
+    dlib,
     pkgs,
     ...
   } @ topArgs: {
@@ -60,6 +61,13 @@
           ${replacePaths}
           ${utils.writeCargoLock}
         '';
+
+        meta = {
+          licenses =
+            l.map
+            (name: l.licenses.${name})
+            subsystemAttrs.licenses.${pname}.${version};
+        };
       });
 
     mkShellForPkg = pkg:

src/subsystems/rust/builders/crane/default.nix

@@ -112,6 +112,12 @@
             ${utils.writeCargoLock}
           '';
           passthru = {dependencies = deps;};
+          meta = {
+            licenses =
+              l.map
+              (name: l.licenses.${name})
+              subsystemAttrs.licenses.${pname}.${version};
+          };
         };
     in
       produceDerivation

src/subsystems/rust/translators/cargo-lock/default.nix

@@ -251,6 +251,16 @@ in {
           gitDeps = l.filter (dep: (getSourceTypeFrom dep) == "git") parsedDeps;
         in
           l.unique (l.map (dep: parseGitSource dep) gitDeps);
+        licenses = l.foldl' l.recursiveUpdate {} (
+          l.map
+          (
+            package: let
+              pkg = package.value.package;
+              licenses = dlib.parseSpdxId (pkg.license or "");
+            in {${pkg.name}.${pkg.version} = licenses;}
+          )
+          cargoPackages
+        );
       };
 
       defaultPackage = package.name;