fix(install) save don't work when pkg is found and version is supplied,

Fix spmjs/spm#1144

lib/install.js

@@ -90,7 +90,13 @@ function* installPackage(id, args, saveDeps) {
 
   // The package has downloaded in dest
   // always false when version is not empty
-  if (existInDest(idObj, args)) return;
+  if (existInDest(idObj, args)) {
+    // save dependencies to package.json
+    if ((args.save || args.saveDev) && saveDeps) {
+      save(idObj, args);
+    }
+    return;
+  }
 
   // Fetch pkg info from registry
   var pinfo = yield* info(idObj, args);

test/install.test.js

@@ -299,6 +299,26 @@ describe('/lib/install.js', function() {
       });
       rimraf.sync(tmpDir);
     });
+
+    it('should save to package.json when found in spm_modules and version is supplied', function* () {
+      var tmpDir = join(fixtures, 'tmp2');
+      var pkgPath = join(tmpDir, 'package.json');
+      mkdirp.sync(tmpDir);
+      fs.writeFileSync(pkgPath, '{"name": "a", "version": "1.0.0"}');
+      var args = {
+        name: '[email protected]',
+        cwd: tmpDir,
+        destination: join(fixtures, 'package-dest', 'spm_modules'),
+        save: true,
+        downloadlist: {}
+      };
+      yield* install.installPackage(args.name, args, true);
+      var pkg = require(pkgPath);
+      pkg.spm.dependencies.should.eql({
+        tmp: '0.0.2'
+      });
+      rimraf.sync(tmpDir);
+    });
   });
 });