Add support for namespaces.

For details of the new feature, see
https://github.com/luarocks/luarocks/wiki/Namespaces

This ended up being a huge commit because of some major refactoring
motivated by the new feature:

* new modules for some object types:
  * `luarocks.queries` - all functions that look for rocks in local or
    remote repositories now use objects constructed by this module:
    query objects contain the name, namespace and query constraints.
    Dependencies in a rockspec are also stored as query objects.
  * `luarocks.results` - all individual results produces from queries
    are returned in this format: result objects contain the name,
    namespace, version, arch and repo.
* the `results` object was renamed to `result_tree`, to better
  reflect that it is not an array of `result` objects.
* `luarocks.vers` was removed, its functionality was moved to better locations.

Specifically on namespaces:

* Commands that take a rock `name` can now take `namespace/name`
  (and alternately `--flags=namespace` so that URLs can be
  also installed with a nominal namespace).
* Rocks installed from a namespace now create a `rock_namespace`
  file alongside `rock_manifest`, which is used when matching
  namespaced dependencies against locally-installed rocks.
* Using namespaced dependencies in a rockspec, requires
  `rockspec_format = "3.0"`.
* Tests under the `#namespaces` hashtag, all using a local repository.

1 files changed, 29 insertions, 2 deletions

diff --git a/spec/install_spec.lua b/spec/install_spec.lua
index 53c8f0d0..4043af35 100644
--- a/spec/install_spec.lua
+++ b/spec/install_spec.lua
@@ -77,11 +77,38 @@ describe("luarocks install #blackbox #b_install", function()
       end)
    end)
    
-   describe("#only namespaced packages", function()
+   describe("#namespaces", function()
       it("installs a namespaced package from the command-line", function()
          assert(run.luarocks_bool("install a_user/a_rock --server=" .. testing_paths.fixtures_dir .. "/a_repo" ))
          assert.is_false(run.luarocks_bool("show a_rock 1.0"))
          assert(run.luarocks_bool("show a_rock 2.0"))
+         assert(lfs.attributes(testing_paths.testing_sys_rocks .. "/a_rock/2.0-1/rock_namespace"))
+      end)
+
+      it("installs a package with a namespaced dependency", function()
+         assert(run.luarocks_bool("install has_namespaced_dep --server=" .. testing_paths.fixtures_dir .. "/a_repo" ))
+         assert(run.luarocks_bool("show has_namespaced_dep"))
+         assert.is_false(run.luarocks_bool("show a_rock 1.0"))
+         assert(run.luarocks_bool("show a_rock 2.0"))
+         assert(lfs.attributes(testing_paths.testing_sys_rocks .. "/a_rock/2.0-1/rock_namespace"))
+      end)
+
+      it("installs a package reusing a namespaced dependency", function()
+         assert(run.luarocks_bool("install a_user/a_rock --server=" .. testing_paths.fixtures_dir .. "/a_repo" ))
+         assert(run.luarocks_bool("show a_rock 2.0"))
+         assert(lfs.attributes(testing_paths.testing_sys_rocks .. "/a_rock/2.0-1/rock_namespace"))
+         local output = run.luarocks("install has_namespaced_dep --server=" .. testing_paths.fixtures_dir .. "/a_repo" )
+         assert.has.no.match("Missing dependencies", output)
+      end)
+
+      it("installs a package considering namespace of locally installed package", function()
+         assert(run.luarocks_bool("install a_user/a_rock --server=" .. testing_paths.fixtures_dir .. "/a_repo" ))
+         assert(run.luarocks_bool("show a_rock 2.0"))
+         assert(lfs.attributes(testing_paths.testing_sys_rocks .. "/a_rock/2.0-1/rock_namespace"))
+         local output = run.luarocks("install has_another_namespaced_dep --server=" .. testing_paths.fixtures_dir .. "/a_repo" )
+         assert.has.match("Missing dependencies", output)
+         print(output)
+         assert(run.luarocks_bool("show a_rock 3.0"))
       end)
    end)
 
@@ -155,7 +182,7 @@ describe("luarocks install #blackbox #b_install", function()
       it("only-deps of luasocket packed rock", function()
          assert.is_true(run.luarocks_bool("build --pack-binary-rock luasocket 3.0rc1-2"))
          local output = run.luarocks("install --only-deps " .. "luasocket-3.0rc1-2." .. test_env.platform .. ".rock")
-         assert.are.same(output, "Successfully installed dependencies for luasocket 3.0rc1-2")
+         assert.are.same("Successfully installed dependencies for luasocket 3.0rc1-2", output:gsub("\n", ""))
          assert.is_true(os.remove("luasocket-3.0rc1-2." .. test_env.platform .. ".rock"))
       end)