Implement PR closing and reopening (#304)

Implement pull request closing/reopening

Signed-off-by: Martin Reboredo <yakoyoku@gmail.com>

Correct year and `pull` description

Apply changes from #291

Return fmt.Errorf instead of log.Fatal if no pull index was supplied

Co-authored-by: Martin Reboredo <yakoyoku@gmail.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/304
Reviewed-by: Norwin <noerw@noreply.gitea.io>
Reviewed-by: appleboy <appleboy.tw@gmail.com>
Co-Authored-By: Martin Reboredo <yakoyakoyokuyoku@noreply.gitea.io>
Co-Committed-By: Martin Reboredo <yakoyakoyokuyoku@noreply.gitea.io>

cmd/pulls/reopen.go

@@ -0,0 +1,26 @@
+// 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 (
+	"code.gitea.io/tea/cmd/flags"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/urfave/cli/v2"
+)
+
+// CmdPullsReopen reopens a given closed pull request
+var CmdPullsReopen = cli.Command{
+	Name:        "reopen",
+	Aliases:     []string{"open"},
+	Usage:       "Change state of a pull request to 'open'",
+	Description: `Change state of a pull request to 'open'`,
+	ArgsUsage:   "<pull index>",
+	Action: func(ctx *cli.Context) error {
+		var s = gitea.StateOpen
+		return editPullState(ctx, gitea.EditPullRequestOption{State: &s})
+	},
+	Flags: flags.AllDefaultFlags,
+}