Add commands for reviews (#315)

add interactive `tea pr review`

it's amazingly simple

vendor gitea.com/noerw/unidiff-comments

add `tea pr lgtm|reject` shorthands

vendor slimmed down diff parser

review diff: default to true

if users want a shortcut, they can use lgtm or reject subcmds

`tea pr approve`: accept optional comment

Co-authored-by: Norwin Roosen <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/315
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: 6543 <6543@obermui.de>
Co-Authored-By: Norwin <noerw@noreply.gitea.io>
Co-Committed-By: Norwin <noerw@noreply.gitea.io>

cmd/pulls/reject.go

@@ -0,0 +1,44 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pulls
+
+import (
+	"fmt"
+	"strings"
+
+	"code.gitea.io/tea/cmd/flags"
+	"code.gitea.io/tea/modules/context"
+	"code.gitea.io/tea/modules/task"
+	"code.gitea.io/tea/modules/utils"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/urfave/cli/v2"
+)
+
+// CmdPullsReject requests changes to a PR
+var CmdPullsReject = cli.Command{
+	Name:        "reject",
+	Usage:       "Request changes to a pull request",
+	Description: "Request changes to a pull request",
+	ArgsUsage:   "<pull index> <reason>",
+	Action: func(cmd *cli.Context) error {
+		ctx := context.InitCommand(cmd)
+		ctx.Ensure(context.CtxRequirement{RemoteRepo: true})
+
+		if ctx.Args().Len() < 2 {
+			return fmt.Errorf("Must specify a PR index and comment")
+		}
+
+		idx, err := utils.ArgToIndex(ctx.Args().First())
+		if err != nil {
+			return err
+		}
+
+		comment := strings.Join(ctx.Args().Tail(), " ")
+
+		return task.CreatePullReview(ctx, idx, gitea.ReviewStateRequestChanges, comment, nil)
+	},
+	Flags: flags.AllDefaultFlags,
+}