lib/github: better type safety on json accesses
[nit.git] / lib / github / api.nit
index 4ca46ad..84badf7 100644 (file)
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Nit object oriented interface to Github api.
+# Nit object oriented interface to [Github api](https://developer.github.com/v3/).
 #
 # This modules reifies Github API elements as Nit classes.
 #
@@ -21,11 +21,9 @@ module api
 
 import github_curl
 
-# Interface to Github REST API.
+# Client to Github API
 #
-# Used by all `GithubEntity` to perform requests.
-#
-# Usage:
+# To access the API you need an instance of a `GithubAPI` client.
 #
 # ~~~
 # # Get Github authentification token.
@@ -36,22 +34,29 @@ import github_curl
 # var api = new GithubAPI(token)
 # ~~~
 #
-# The API client allows to get Github API entities:
+# The API client allows you to get Github API entities.
 #
 # ~~~
-# var repo = api.load_repo("privat/nit")
-# assert repo isa Repo
+# var repo = api.load_repo("nitlang/nit")
+# assert repo != null
 # assert repo.name == "nit"
 #
 # var user = api.load_user("Morriar")
-# assert user isa User
+# assert user != null
 # assert user.login == "Morriar"
 # ~~~
 class GithubAPI
 
-       # Github API OAuth token.
+       # Github API OAuth token
+       #
+       # To access your private ressources, you must
+       # [authenticate](https://developer.github.com/guides/basics-of-authentication/).
+       #
+       # For client applications, Github recommands to use the
+       # [OAuth tokens](https://developer.github.com/v3/oauth/) authentification method.
+       #
+       #
        #
-       # This token is used to authenticate the application on Github API.
        # Be aware that there is [rate limits](https://developer.github.com/v3/rate_limit/)
        # associated to the key.
        var auth: String
@@ -86,10 +91,10 @@ class GithubAPI
        # Execute a GET request on Github API.
        #
        # This method returns raw json data.
-       # See other `get_*` methods to use more expressive types.
+       # See other `load_*` methods to use more expressive types.
        #
        #     var api = new GithubAPI(get_github_oauth)
-       #     var obj = api.get("repos/privat/nit")
+       #     var obj = api.get("repos/nitlang/nit")
        #     assert obj isa JsonObject
        #     assert obj["name"] == "nit"
        #
@@ -133,40 +138,188 @@ class GithubAPI
 
        # Load the json object from Github.
        # See `GithubEntity::load_from_github`.
-       private fun load_from_github(key: String): JsonObject do
+       protected fun load_from_github(key: String): JsonObject do
                message(1, "Get {key} (github)")
                var res = get(key)
                if was_error then return new JsonObject
                return res.as(JsonObject)
        end
 
-       # Get the Github user with `login`.
+       # Get the Github user with `login`
        #
-       # Returns `null` if the user cannot be found.
+       # Loads the `User` from the API or returns `null` if the user cannot be found.
        #
        #     var api = new GithubAPI(get_github_oauth)
        #     var user = api.load_user("Morriar")
        #     assert user.login == "Morriar"
        fun load_user(login: String): nullable User do
                var user = new User(self, login)
-               user.load_from_github
-               if was_error then return null
-               return user
+               return user.load_from_github
        end
 
        # Get the Github repo with `full_name`.
        #
-       # Returns `null` if the repo cannot be found.
+       # Loads the `Repo` from the API or returns `null` if the repo cannot be found.
        #
        #     var api = new GithubAPI(get_github_oauth)
-       #     var repo = api.load_repo("privat/nit")
+       #     var repo = api.load_repo("nitlang/nit")
        #     assert repo.name == "nit"
-       #     assert repo.owner.login == "privat"
+       #     assert repo.owner.login == "nitlang"
+       #     assert repo.default_branch.name == "master"
        fun load_repo(full_name: String): nullable Repo do
                var repo = new Repo(self, full_name)
-               repo.load_from_github
-               if was_error then return null
-               return repo
+               return repo.load_from_github
+       end
+
+       # Get the Github branch with `name`.
+       #
+       # Returns `null` if the branch cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var branch = api.load_branch(repo, "master")
+       #     assert branch.name == "master"
+       #     assert branch.commit isa Commit
+       fun load_branch(repo: Repo, name: String): nullable Branch do
+               var branch = new Branch(self, repo, name)
+               return branch.load_from_github
+       end
+
+       # Get the Github commit with `sha`.
+       #
+       # Returns `null` if the commit cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var commit = api.load_commit(repo, "64ce1f")
+       #     assert commit isa Commit
+       fun load_commit(repo: Repo, sha: String): nullable Commit do
+               var commit = new Commit(self, repo, sha)
+               return commit.load_from_github
+       end
+
+       # Get the Github issue #`number`.
+       #
+       # Returns `null` if the issue cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var issue = api.load_issue(repo, 1)
+       #     assert issue.title == "Doc"
+       fun load_issue(repo: Repo, number: Int): nullable Issue do
+               var issue = new Issue(self, repo, number)
+               return issue.load_from_github
+       end
+
+       # Get the Github pull request #`number`.
+       #
+       # Returns `null` if the pull request cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var pull = api.load_pull(repo, 1)
+       #     assert pull.title == "Doc"
+       #     assert pull.user.login == "Morriar"
+       fun load_pull(repo: Repo, number: Int): nullable PullRequest do
+               var pull = new PullRequest(self, repo, number)
+               return pull.load_from_github
+       end
+
+       # Get the Github label with `name`.
+       #
+       # Returns `null` if the label cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var labl = api.load_label(repo, "ok_will_merge")
+       #     assert labl != null
+       fun load_label(repo: Repo, name: String): nullable Label do
+               var labl = new Label(self, repo, name)
+               return labl.load_from_github
+       end
+
+       # Get the Github milestone with `id`.
+       #
+       # Returns `null` if the milestone cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var stone = api.load_milestone(repo, 4)
+       #     assert stone.title == "v1.0prealpha"
+       fun load_milestone(repo: Repo, id: Int): nullable Milestone do
+               var milestone = new Milestone(self, repo, id)
+               return milestone.load_from_github
+       end
+
+       # Get the Github issue event with `id`.
+       #
+       # Returns `null` if the event cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo isa Repo
+       #     var event = api.load_issue_event(repo, 199674194)
+       #     assert event.actor.login == "privat"
+       #     assert event.event == "labeled"
+       #     assert event.labl.name == "need_review"
+       #     assert event.issue.number == 945
+       fun load_issue_event(repo: Repo, id: Int): nullable IssueEvent do
+               var event = new IssueEvent(self, repo, id)
+               return event.load_from_github
+       end
+
+       # Get the Github commit comment with `id`.
+       #
+       # Returns `null` if the comment cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var comment = api.load_commit_comment(repo, 8982707)
+       #     assert comment.user.login == "Morriar"
+       #     assert comment.body == "For testing purposes..."
+       #     assert comment.commit.sha == "7eacb86d1e24b7e72bc9ac869bf7182c0300ceca"
+       fun load_commit_comment(repo: Repo, id: Int): nullable CommitComment do
+               var comment = new CommitComment(self, repo, id)
+               return comment.load_from_github
+       end
+
+       # Get the Github issue comment with `id`.
+       #
+       # Returns `null` if the comment cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var comment = api.load_issue_comment(repo, 6020149)
+       #     assert comment.user.login == "privat"
+       #     assert comment.created_at.to_s == "2012-05-30T20:16:54Z"
+       #     assert comment.issue.number == 10
+       fun load_issue_comment(repo: Repo, id: Int): nullable IssueComment do
+               var comment = new IssueComment(self, repo, id)
+               return comment.load_from_github
+       end
+
+       # Get the Github diff comment with `id`.
+       #
+       # Returns `null` if the comment cannot be found.
+       #
+       #     var api = new GithubAPI(get_github_oauth)
+       #     var repo = api.load_repo("nitlang/nit")
+       #     assert repo != null
+       #     var comment = api.load_review_comment(repo, 21010363)
+       #     assert comment.path == "src/modelize/modelize_property.nit"
+       #     assert comment.original_position == 26
+       #     assert comment.pull.number == 945
+       fun load_review_comment(repo: Repo, id: Int): nullable ReviewComment do
+               var comment = new ReviewComment(self, repo, id)
+               return comment.load_from_github
        end
 end
 
@@ -189,18 +342,22 @@ abstract class GithubEntity
        var json: JsonObject is noinit, protected writable
 
        # Load `json` from Github API.
-       private fun load_from_github do
+       private fun load_from_github: nullable SELF do
                json = api.load_from_github(key)
+               if api.was_error then return null
+               return self
        end
 
        redef fun to_s do return json.to_json
+
+       # Github page url.
+       fun html_url: String do return json["html_url"].as(String)
 end
 
-# A Github user.
+# A Github user
 #
+# Provides access to [Github user data](https://developer.github.com/v3/users/).
 # Should be accessed from `GithubAPI::load_user`.
-#
-# See <https://developer.github.com/v3/users/>.
 class User
        super GithubEntity
 
@@ -211,22 +368,18 @@ class User
 
        # Init `self` from a `json` object.
        init from_json(api: GithubAPI, json: JsonObject) do
-               init(api, json["login"].to_s)
+               init(api, json["login"].as(String))
                self.json = json
        end
 
-       # Github User page url.
-       fun html_url: String do return json["html_url"].to_s
-
        # Avatar image url for this user.
-       fun avatar_url: String do return json["avatar_url"].to_s
+       fun avatar_url: String do return json["avatar_url"].as(String)
 end
 
 # A Github repository.
 #
+# Provides access to [Github repo data](https://developer.github.com/v3/repos/).
 # Should be accessed from `GithubAPI::load_repo`.
-#
-# See <https://developer.github.com/v3/repos/>.
 class Repo
        super GithubEntity
 
@@ -237,18 +390,861 @@ class Repo
 
        # Init `self` from a `json` object.
        init from_json(api: GithubAPI, json: JsonObject) do
-               init(api, json["full_name"].to_s)
+               init(api, json["full_name"].as(String))
                self.json = json
        end
 
        # Repo short name on Github.
-       fun name: String do return json["name"].to_s
-
-       # Github User page url.
-       fun html_url: String do return json["html_url"].to_s
+       fun name: String do return json["name"].as(String)
 
        # Get the repo owner.
        fun owner: User do
                return new User.from_json(api, json["owner"].as(JsonObject))
        end
+
+       # List of branches associated with their names.
+       fun branches: Map[String, Branch] do
+               api.message(1, "Get branches for {full_name}")
+               var array = api.get("repos/{full_name}/branches")
+               var res = new HashMap[String, Branch]
+               if not array isa JsonArray then return res
+               for obj in array do
+                       if not obj isa JsonObject then continue
+                       var name = obj["name"].as(String)
+                       res[name] = new Branch.from_json(api, self, obj)
+               end
+               return res
+       end
+
+       # List of issues associated with their ids.
+       fun issues: Map[Int, Issue] do
+               api.message(1, "Get issues for {full_name}")
+               var res = new HashMap[Int, Issue]
+               var issue = last_issue
+               if issue == null then return res
+               res[issue.number] = issue
+               while issue.number > 1 do
+                       issue = api.load_issue(self, issue.number - 1)
+                       assert issue isa Issue
+                       res[issue.number] = issue
+               end
+               return res
+       end
+
+       # Search issues in this repo form an advanced query.
+       #
+       # Example:
+       #
+       # ~~~nitish
+       # var issues = repo.search_issues("is:open label:need_review")
+       # ~~~
+       #
+       # See <https://developer.github.com/v3/search/#search-issues>.
+       fun search_issues(query: String): nullable Array[Issue] do
+               query = "search/issues?q={query} repo:{full_name}"
+               var response = api.get(query)
+               if api.was_error then return null
+               var arr = response.as(JsonObject)["items"].as(JsonArray)
+               var res = new Array[Issue]
+               for obj in arr do
+                       res.add new Issue.from_json(api, self, obj.as(JsonObject))
+               end
+               return res
+       end
+
+       # Get the last published issue.
+       fun last_issue: nullable Issue do
+               var array = api.get("repos/{full_name}/issues")
+               if not array isa JsonArray then return null
+               if array.is_empty then return null
+               var obj = array.first
+               if not obj isa JsonObject then return null
+               return new Issue.from_json(api, self, obj)
+       end
+
+       # List of labels associated with their names.
+       fun labels: Map[String, Label] do
+               api.message(1, "Get labels for {full_name}")
+               var array = api.get("repos/{full_name}/labels")
+               var res = new HashMap[String, Label]
+               if not array isa JsonArray then return res
+               for obj in array do
+                       if not obj isa JsonObject then continue
+                       var name = obj["name"].as(String)
+                       res[name] = new Label.from_json(api, self, obj)
+               end
+               return res
+       end
+
+       # List of milestones associated with their ids.
+       fun milestones: Map[Int, Milestone] do
+               api.message(1, "Get milestones for {full_name}")
+               var array = api.get("repos/{full_name}/milestones")
+               var res = new HashMap[Int, Milestone]
+               if array isa JsonArray then
+                       for obj in array do
+                               if not obj isa JsonObject then continue
+                               var number = obj["number"].as(Int)
+                               res[number] = new Milestone.from_json(api, self, obj)
+                       end
+               end
+               return res
+       end
+
+       # List of pull-requests associated with their ids.
+       #
+       # Implementation notes: because PR numbers are not consecutive,
+       # PR are loaded from pages.
+       # See: https://developer.github.com/v3/pulls/#list-pull-requests
+       fun pulls: Map[Int, PullRequest] do
+               api.message(1, "Get pulls for {full_name}")
+               var res = new HashMap[Int, PullRequest]
+               var page = 1
+               var array = api.get("{key}/pulls?page={page}").as(JsonArray)
+               while not array.is_empty do
+                       for obj in array do
+                               if not obj isa JsonObject then continue
+                               var number = obj["number"].as(Int)
+                               res[number] = new PullRequest.from_json(api, self, obj)
+                       end
+                       page += 1
+                       array = api.get("{key}/pulls?page={page}").as(JsonArray)
+               end
+               return res
+       end
+
+       # List of contributor related statistics.
+       fun contrib_stats: Array[ContributorStats] do
+               api.message(1, "Get contributor stats for {full_name}")
+               var res = new Array[ContributorStats]
+               var array = api.get("{key}/stats/contributors")
+               if array isa JsonArray then
+                       for obj in array do
+                               res.add new ContributorStats.from_json(api, obj.as(JsonObject))
+                       end
+               end
+               return res
+       end
+
+       # Repo default branch.
+       fun default_branch: Branch do
+               var name = json["default_branch"].as(String)
+               var branch = api.load_branch(self, name)
+               assert branch isa Branch
+               return branch
+       end
+end
+
+# A `RepoEntity` is something contained in a `Repo`.
+abstract class RepoEntity
+       super GithubEntity
+
+       # Repo that contains `self`.
+       var repo: Repo
+
+       # Init `self` from a `json` object.
+       init from_json(api: GithubAPI, repo: Repo, json: JsonObject) do
+               self.api = api
+               self.repo = repo
+               self.json = json
+       end
+end
+
+# A Github branch.
+#
+# Should be accessed from `GithubAPI::load_branch`.
+#
+# See <https://developer.github.com/v3/repos/#list-branches>.
+class Branch
+       super RepoEntity
+
+       redef var key is lazy do return "{repo.key}/branches/{name}"
+
+       # Branch name.
+       var name: String
+
+       redef init from_json(api, repo, json) do
+               self.name = json["name"].as(String)
+               super
+       end
+
+       # Get the last commit of `self`.
+       fun commit: Commit do
+               return new Commit.from_json(api, repo, json["commit"].as(JsonObject))
+       end
+
+       # List all commits in `self`.
+       #
+       # This can be long depending on the branch size.
+       # Commit are returned in an unspecified order.
+       fun commits: Array[Commit] do
+               var res = new Array[Commit]
+               var done = new HashSet[String]
+               var todos = new Array[Commit]
+               todos.add commit
+               while not todos.is_empty do
+                       var commit = todos.pop
+                       if done.has(commit.sha) then continue
+                       done.add commit.sha
+                       res.add commit
+                       for parent in commit.parents do
+                               todos.add parent
+                       end
+               end
+               return res
+       end
+end
+
+# A Github commit.
+#
+# Should be accessed from `GithubAPI::load_commit`.
+#
+# See <https://developer.github.com/v3/repos/commits/>.
+class Commit
+       super RepoEntity
+
+       redef var key is lazy do return "{repo.key}/commits/{sha}"
+
+       # Commit SHA.
+       var sha: String
+
+       redef init from_json(api, repo, json) do
+               self.sha = json["sha"].as(String)
+               super
+       end
+
+       # Parent commits of `self`.
+       fun parents: Array[Commit] do
+               var res = new Array[Commit]
+               var parents = json.get_or_null("parents")
+               if not parents isa JsonArray then return res
+               for obj in parents do
+                       if not obj isa JsonObject then continue
+                       res.add(api.load_commit(repo, obj["sha"].as(String)).as(not null))
+               end
+               return res
+       end
+
+       # Author of the commit.
+       fun author: nullable User do
+               var user = json.get_or_null("author")
+               if user isa JsonObject then return new User.from_json(api, user)
+               return null
+       end
+
+       # Committer of the commit.
+       fun committer: nullable User do
+               var user = json.get_or_null("author")
+               if user isa JsonObject then return new User.from_json(api, user)
+               return null
+       end
+
+       # Authoring date as ISODate.
+       fun author_date: ISODate do
+               var commit = json["commit"].as(JsonObject)
+               var author = commit["author"].as(JsonObject)
+               return new ISODate.from_string(author["date"].as(String))
+       end
+
+       # Commit date as ISODate.
+       fun commit_date: ISODate do
+               var commit = json["commit"].as(JsonObject)
+               var author = commit["committer"].as(JsonObject)
+               return new ISODate.from_string(author["date"].as(String))
+       end
+
+       # List files staged in this commit.
+       fun files: Array[GithubFile] do
+               var res = new Array[GithubFile]
+               var files = json.get_or_null("files")
+               if not files isa JsonArray then return res
+               for obj in files do
+                       res.add(new GithubFile(obj.as(JsonObject)))
+               end
+               return res
+       end
+
+       # Commit message.
+       fun message: String do return json["commit"].as(JsonObject)["message"].as(String)
+end
+
+# A Github issue.
+#
+# Should be accessed from `GithubAPI::load_issue`.
+#
+# See <https://developer.github.com/v3/issues/>.
+class Issue
+       super RepoEntity
+
+       redef var key is lazy do return "{repo.key}/issues/{number}"
+
+       # Issue Github ID.
+       var number: Int
+
+       redef init from_json(api, repo, json) do
+               self.number = json["number"].as(Int)
+               super
+       end
+
+       # Issue title.
+       fun title: String do return json["title"].as(String)
+
+       # User that created this issue.
+       fun user: User do
+               return new User.from_json(api, json["user"].as(JsonObject))
+       end
+
+       # List of labels on this issue associated to their names.
+       fun labels: Map[String, Label] do
+               var res = new HashMap[String, Label]
+               var lbls = json.get_or_null("labels")
+               if not lbls isa JsonArray then return res
+               for obj in lbls do
+                       if not obj isa JsonObject then continue
+                       var name = obj["name"].as(String)
+                       res[name] = new Label.from_json(api, repo, obj)
+               end
+               return res
+       end
+
+       # State of the issue on Github.
+       fun state: String do return json["state"].as(String)
+
+       # Is the issue locked?
+       fun locked: Bool do return json["locked"].as(Bool)
+
+       # Assigned `User` (if any).
+       fun assignee: nullable User do
+               var assignee = json.get_or_null("assignee")
+               if assignee isa JsonObject then return new User.from_json(api, assignee)
+               return null
+       end
+
+       # `Milestone` (if any).
+       fun milestone: nullable Milestone do
+               var milestone = json.get_or_null("milestone")
+               if milestone isa JsonObject then return new Milestone.from_json(api, repo, milestone)
+               return null
+       end
+
+       # List of comments made on this issue.
+       fun comments: Array[IssueComment] do
+               var res = new Array[IssueComment]
+               var count = comments_count
+               var page = 1
+               var array = api.get("{key}/comments?page={page}")
+               if not array isa JsonArray then
+                       return res
+               end
+               while not array.is_empty and res.length < count do
+                       for obj in array do
+                               if not obj isa JsonObject then continue
+                               var id = obj["id"].as(Int)
+                               res.add(api.load_issue_comment(repo, id).as(not null))
+                       end
+                       page += 1
+                       array = api.get("{key}/comments?page={page}").as(JsonArray)
+               end
+               return res
+       end
+
+       # Number of comments on this issue.
+       fun comments_count: Int do return json["comments"].as(Int)
+
+       # Creation time in ISODate format.
+       fun created_at: ISODate do
+               return new ISODate.from_string(json["created_at"].as(String))
+       end
+
+       # Last update time in ISODate format (if any).
+       fun updated_at: nullable ISODate do
+               var res = json.get_or_null("updated_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+
+       # Close time in ISODate format (if any).
+       fun closed_at: nullable ISODate do
+               var res = json.get_or_null("closed_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+
+       # TODO link to pull request
+
+       # Full description of the issue.
+       fun body: String  do return json["body"].as(String)
+
+       # List of events on this issue.
+       fun events: Array[IssueEvent] do
+               var res = new Array[IssueEvent]
+               var page = 1
+               var array = api.get("{key}/events?page={page}")
+               if not array isa JsonArray then return res
+               while not array.is_empty do
+                       for obj in array do
+                               if not obj isa JsonObject then continue
+                               res.add new IssueEvent.from_json(api, repo, obj)
+                       end
+                       page += 1
+                       array = api.get("{key}/events?page={page}").as(JsonArray)
+               end
+               return res
+       end
+
+       # User that closed this issue (if any).
+       fun closed_by: nullable User do
+               var closer = json.get_or_null("closed_by")
+               if closer isa JsonObject then return new User.from_json(api, closer)
+               return null
+       end
+end
+
+# A Github pull request.
+#
+# Should be accessed from `GithubAPI::load_pull`.
+#
+# PullRequest are basically Issues with more data.
+# See <https://developer.github.com/v3/pulls/>.
+class PullRequest
+       super Issue
+
+       redef var key is lazy do return "{repo.key}/pulls/{number}"
+
+       # Merge time in ISODate format (if any).
+       fun merged_at: nullable ISODate do
+               var res = json.get_or_null("merged_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+
+       # Merge commit SHA.
+       fun merge_commit_sha: String do return json["merge_commit_sha"].as(String)
+
+       # Count of comments made on the pull request diff.
+       fun review_comments: Int do return json["review_comments"].as(Int)
+
+       # Pull request head (can be a commit SHA or a branch name).
+       fun head: PullRef do
+               var json = json["head"].as(JsonObject)
+               return new PullRef(api, json)
+       end
+
+       # Pull request base (can be a commit SHA or a branch name).
+       fun base: PullRef do
+               var json = json["base"].as(JsonObject)
+               return new PullRef(api, json)
+       end
+
+       # Is this pull request merged?
+       fun merged: Bool do return json["merged"].as(Bool)
+
+       # Is this pull request mergeable?
+       fun mergeable: Bool do return json["mergeable"].as(Bool)
+
+       # Mergeable state of this pull request.
+       #
+       # See <https://developer.github.com/v3/pulls/#list-pull-requests>.
+       fun mergeable_state: Int do return json["mergeable_state"].as(Int)
+
+       # User that merged this pull request (if any).
+       fun merged_by: nullable User do
+               var merger = json.get_or_null("merged_by")
+               if merger isa JsonObject then return new User.from_json(api, merger)
+               return null
+       end
+
+       # Count of commits in this pull request.
+       fun commits: Int do return json["commits"].as(Int)
+
+       # Added line count.
+       fun additions: Int do return json["additions"].as(Int)
+
+       # Deleted line count.
+       fun deletions: Int do return json["deletions"].as(Int)
+
+       # Changed files count.
+       fun changed_files: Int do return json["changed_files"].as(Int)
+end
+
+# A pull request reference (used for head and base).
+class PullRef
+
+       # Api instance that maintains self.
+       var api: GithubAPI
+
+       # JSON representation.
+       var json: JsonObject
+
+       # Label pointed by `self`.
+       fun labl: String do return json["label"].as(String)
+
+       # Reference pointed by `self`.
+       fun ref: String do return json["ref"].as(String)
+
+       # Commit SHA pointed by `self`.
+       fun sha: String do return json["sha"].as(String)
+
+       # User pointed by `self`.
+       fun user: User do
+               return new User.from_json(api, json["user"].as(JsonObject))
+       end
+
+       # Repo pointed by `self`.
+       fun repo: Repo do
+               return new Repo.from_json(api, json["repo"].as(JsonObject))
+       end
+end
+
+# A Github label.
+#
+# Should be accessed from `GithubAPI::load_label`.
+#
+# See <https://developer.github.com/v3/issues/labels/>.
+class Label
+       super RepoEntity
+
+       redef var key is lazy do return "{repo.key}/labels/{name}"
+
+       # Label name.
+       var name: String
+
+       redef init from_json(api, repo, json) do
+               self.name = json["name"].as(String)
+               super
+       end
+
+       # Label color code.
+       fun color: String do return json["color"].as(String)
+end
+
+# A Github milestone.
+#
+# Should be accessed from `GithubAPI::load_milestone`.
+#
+# See <https://developer.github.com/v3/issues/milestones/>.
+class Milestone
+       super RepoEntity
+
+       redef var key is lazy do return "{repo.key}/milestones/{number}"
+
+       # The milestone id on Github.
+       var number: Int
+
+       redef init from_json(api, repo, json) do
+               super
+               self.number = json["number"].as(Int)
+       end
+
+       # Milestone title.
+       fun title: String do return json["title"].as(String)
+
+       # Milestone long description.
+       fun description: String do return json["description"].as(String)
+
+       # Count of opened issues linked to this milestone.
+       fun open_issues: Int do return json["open_issues"].as(Int)
+
+       # Count of closed issues linked to this milestone.
+       fun closed_issues: Int do return json["closed_issues"].as(Int)
+
+       # Milestone state.
+       fun state: String do return json["state"].as(String)
+
+       # Creation time in ISODate format.
+       fun created_at: ISODate do
+               return new ISODate.from_string(json["created_at"].as(String))
+       end
+
+       # User that created this milestone.
+       fun creator: User do
+               return new User.from_json(api, json["creator"].as(JsonObject))
+       end
+
+       # Due time in ISODate format (if any).
+       fun due_on: nullable ISODate do
+               var res = json.get_or_null("updated_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+
+       # Update time in ISODate format (if any).
+       fun updated_at: nullable ISODate do
+               var res = json.get_or_null("updated_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+
+       # Close time in ISODate format (if any).
+       fun closed_at: nullable ISODate do
+               var res = json.get_or_null("closed_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+end
+
+# A Github comment
+#
+# There is two kinds of comments:
+#
+# * `CommitComment` are made on a commit page.
+# * `IssueComment` are made on an issue or pull request page.
+# * `ReviewComment` are made on the diff associated to a pull request.
+abstract class Comment
+       super RepoEntity
+
+       # Identifier of this comment.
+       var id: Int
+
+       redef init from_json(api, repo, json) do
+               self.id = json["id"].as(Int)
+               super
+       end
+
+       # User that made this comment.
+       fun user: User do
+               return new User.from_json(api, json["user"].as(JsonObject))
+       end
+
+       # Creation time in ISODate format.
+       fun created_at: ISODate do
+               return new ISODate.from_string(json["created_at"].as(String))
+       end
+
+       # Last update time in ISODate format (if any).
+       fun updated_at: nullable ISODate do
+               var res = json.get_or_null("updated_at")
+               if res isa String then return new ISODate.from_string(res)
+               return null
+       end
+
+       # Comment body text.
+       fun body: String do return json["body"].as(String)
+
+       # Does the comment contain an acknowledgement (+1)
+       fun is_ack: Bool
+       do
+               return body.has("\\+1\\b".to_re) or body.has(":+1:") or body.has(":shipit:")
+       end
+end
+
+# A comment made on a commit.
+class CommitComment
+       super Comment
+
+       redef var key is lazy do return "{repo.key}/comments/{id}"
+
+       # Commented commit.
+       fun commit: Commit do
+               return api.load_commit(repo, json["commit_id"].as(String)).as(not null)
+       end
+
+       # Position of the comment on the line.
+       fun position: nullable String do
+               var res = json.get_or_null("position")
+               if res isa String then return res
+               return null
+       end
+
+       # Line of the comment.
+       fun line: nullable String do
+               var res = json.get_or_null("line")
+               if res isa String then return res
+               return null
+       end
+
+       # Path of the commented file.
+       fun path: String do return json["path"].as(String)
+end
+
+# Comments made on Github issue and pull request pages.
+#
+# Should be accessed from `GithubAPI::load_issue_comment`.
+#
+# See <https://developer.github.com/v3/issues/comments/>.
+class IssueComment
+       super Comment
+
+       redef var key is lazy do return "{repo.key}/issues/comments/{id}"
+
+       # Issue that contains `self`.
+       fun issue: Issue do
+               var number = issue_url.split("/").last.to_i
+               return api.load_issue(repo, number).as(not null)
+       end
+
+       # Link to the issue document on API.
+       fun issue_url: String do return json["issue_url"].as(String)
+end
+
+# Comments made on Github pull request diffs.
+#
+# Should be accessed from `GithubAPI::load_diff_comment`.
+#
+# See <https://developer.github.com/v3/pulls/comments/>.
+class ReviewComment
+       super Comment
+
+       redef var key is lazy do return "{repo.key}/pulls/comments/{id}"
+
+       # Pull request that contains `self`.
+       fun pull: PullRequest do
+               var number = pull_request_url.split("/").last.to_i
+               return api.load_pull(repo, number).as(not null)
+       end
+
+       # Link to the pull request on API.
+       fun pull_request_url: String do return json["pull_request_url"].as(String)
+
+       # Diff hunk.
+       fun diff_hunk: String do return json["diff_hunk"].as(String)
+
+       # Path of commented file.
+       fun path: String do return json["path"].as(String)
+
+       # Position of the comment on the file.
+       fun position: Int do return json["position"].as(Int)
+
+       # Original position in the diff.
+       fun original_position: Int do return json["original_position"].as(Int)
+
+       # Commit referenced by this comment.
+       fun commit_id: String do return json["commit_id"].as(String)
+
+       # Original commit id.
+       fun original_commit_id: String do return json["original_commit_id"].as(String)
+end
+
+# An event that occurs on a Github `Issue`.
+#
+# Should be accessed from `GithubAPI::load_issue_event`.
+#
+# See <https://developer.github.com/v3/issues/events/>.
+class IssueEvent
+       super RepoEntity
+
+       redef var key is lazy do return "{repo.key}/issues/events/{id}"
+
+       # Event id on Github.
+       var id: Int
+
+       redef init from_json(api, repo, json) do
+               self.id = json["id"].as(Int)
+               super
+       end
+
+       # Issue that contains `self`.
+       fun issue: Issue do
+               return new Issue.from_json(api, repo, json["issue"].as(JsonObject))
+       end
+
+       # User that initiated the event.
+       fun actor: User do
+               return new User.from_json(api, json["actor"].as(JsonObject))
+       end
+
+       # Creation time in ISODate format.
+       fun created_at: ISODate do
+               return new ISODate.from_string(json["created_at"].as(String))
+       end
+
+       # Event descriptor.
+       fun event: String do return json["event"].as(String)
+
+       # Commit linked to this event (if any).
+       fun commit_id: nullable String do
+               var res = json.get_or_null("commit_id")
+               if res isa String then return res
+               return null
+       end
+
+       # Label linked to this event (if any).
+       fun labl: nullable Label do
+               var res = json.get_or_null("label")
+               if res isa JsonObject then return new Label.from_json(api, repo, res)
+               return null
+       end
+
+       # User linked to this event (if any).
+       fun assignee: nullable User do
+               var res = json.get_or_null("assignee")
+               if res isa JsonObject then return new User.from_json(api, res)
+               return null
+       end
+
+       # Milestone linked to this event (if any).
+       fun milestone: nullable Milestone do
+               var res = json.get_or_null("milestone")
+               if res isa JsonObject then return new Milestone.from_json(api, repo, res)
+               return null
+       end
+
+       # Rename linked to this event (if any).
+       fun rename: nullable RenameAction do
+               var res = json.get_or_null("rename")
+               if res isa JsonObject then return new RenameAction(res)
+               return null
+       end
+end
+
+# A rename action maintains the name before and after a renaming action.
+class RenameAction
+
+       # JSON content.
+       var json: JsonObject
+
+       # Name before renaming.
+       fun from: String do return json["from"].as(String)
+
+       # Name after renaming.
+       fun to: String do return json["to"].as(String)
+end
+
+# Contributors list with additions, deletions, and commit counts.
+#
+# Should be accessed from `Repo::contrib_stats`.
+#
+# See <https://developer.github.com/v3/repos/statistics/>.
+class ContributorStats
+       super Comparable
+
+       redef type OTHER: ContributorStats
+
+       # Github API client.
+       var api: GithubAPI
+
+       # Json content.
+       var json: JsonObject
+
+       # Init `self` from a `json` object.
+       init from_json(api: GithubAPI, json: JsonObject) do
+               self.api = api
+               self.json = json
+       end
+
+       # User these statistics are about.
+       fun author: User do
+               return new User.from_json(api, json["author"].as(JsonObject))
+       end
+
+       # Total number of commit.
+       fun total: Int do return json["total"].as(Int)
+
+       # Are of weeks of activity with detailed statistics.
+       fun weeks: JsonArray do return json["weeks"].as(JsonArray)
+
+       # ContributorStats can be compared on the total amount of commits.
+       redef fun <(o) do return total < o.total
+end
+
+# A Github file representation.
+#
+# Mostly a wrapper around a json object.
+class GithubFile
+
+       # Json content.
+       var json: JsonObject
+
+       # File name.
+       fun filename: String do return json["filename"].as(String)
 end