Implement more issue filters (#400)

This adds new filters to `tea issues ls` and `tea pr ls`, made available in SDK 0.15:

```
--state value                 Filter by state (all|open|closed) (default: open)
--keyword value, -k value     Filter by search string
--labels value, -L value      Comma-separated list of labels to match issues against.
--milestones value, -m value  Comma-separated list of milestones to match issues against.
--author value, -A value
--assignee value, -a value
--mentions value, -M value
--from value, -F value        Filter by activity after this date
--until value, -u value       Filter by activity before this date
```

Note: I felt free to change parameter names as exposed by SDK & API, as the names exposed by them are partially bollocks (eg `mentioned_by`) and or inconsistent with usage in other commands (eg `tea times --until`)

fixes #376, related #323

Co-authored-by: Norwin <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/400
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/flags/issue_pr.go

@@ -0,0 +1,161 @@
+// Copyright 2019 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 flags
+
+import (
+	"fmt"
+	"strings"
+
+	"code.gitea.io/sdk/gitea"
+	"code.gitea.io/tea/modules/context"
+	"code.gitea.io/tea/modules/task"
+
+	"github.com/araddon/dateparse"
+	"github.com/urfave/cli/v2"
+)
+
+// StateFlag provides flag to specify issue/pr state, defaulting to "open"
+var StateFlag = cli.StringFlag{
+	Name:        "state",
+	Usage:       "Filter by state (all|open|closed)",
+	DefaultText: "open",
+}
+
+// MilestoneFilterFlag is a CSV flag used to filter issues by milestones
+var MilestoneFilterFlag = NewCsvFlag(
+	"milestones",
+	"milestones to match issues against",
+	[]string{"m"}, nil, nil)
+
+// LabelFilterFlag is a CSV flag used to filter issues by labels
+var LabelFilterFlag = NewCsvFlag(
+	"labels",
+	"labels to match issues against",
+	[]string{"L"}, nil, nil)
+
+// PRListingFlags defines flags that should be available on pr listing flags.
+var PRListingFlags = append([]cli.Flag{
+	&StateFlag,
+	&PaginationPageFlag,
+	&PaginationLimitFlag,
+}, AllDefaultFlags...)
+
+// IssueListingFlags defines flags that should be available on issue listing flags.
+var IssueListingFlags = append([]cli.Flag{
+	&StateFlag,
+	&cli.StringFlag{
+		Name:        "kind",
+		Aliases:     []string{"K"},
+		Usage:       "Wether to return `issues`, `pulls`, or `all` (you can use this to apply advanced search filters to PRs)",
+		DefaultText: "issues",
+	},
+	&cli.StringFlag{
+		Name:    "keyword",
+		Aliases: []string{"k"},
+		Usage:   "Filter by search string",
+	},
+	LabelFilterFlag,
+	MilestoneFilterFlag,
+	&cli.StringFlag{
+		Name:    "author",
+		Aliases: []string{"A"},
+	},
+	&cli.StringFlag{
+		Name:    "assignee",
+		Aliases: []string{"a"},
+	},
+	&cli.StringFlag{
+		Name:    "mentions",
+		Aliases: []string{"M"},
+	},
+	&cli.StringFlag{
+		Name:    "from",
+		Aliases: []string{"F"},
+		Usage:   "Filter by activity after this date",
+	},
+	&cli.StringFlag{
+		Name:    "until",
+		Aliases: []string{"u"},
+		Usage:   "Filter by activity before this date",
+	},
+	&PaginationPageFlag,
+	&PaginationLimitFlag,
+}, AllDefaultFlags...)
+
+// IssuePREditFlags defines flags for properties of issues and PRs
+var IssuePREditFlags = append([]cli.Flag{
+	&cli.StringFlag{
+		Name:    "title",
+		Aliases: []string{"t"},
+	},
+	&cli.StringFlag{
+		Name:    "description",
+		Aliases: []string{"d"},
+	},
+	&cli.StringFlag{
+		Name:    "assignees",
+		Aliases: []string{"a"},
+		Usage:   "Comma-separated list of usernames to assign",
+	},
+	&cli.StringFlag{
+		Name:    "labels",
+		Aliases: []string{"L"},
+		Usage:   "Comma-separated list of labels to assign",
+	},
+	&cli.StringFlag{
+		Name:    "deadline",
+		Aliases: []string{"D"},
+		Usage:   "Deadline timestamp to assign",
+	},
+	&cli.StringFlag{
+		Name:    "milestone",
+		Aliases: []string{"m"},
+		Usage:   "Milestone to assign",
+	},
+}, LoginRepoFlags...)
+
+// GetIssuePREditFlags parses all IssuePREditFlags
+func GetIssuePREditFlags(ctx *context.TeaContext) (*gitea.CreateIssueOption, error) {
+	opts := gitea.CreateIssueOption{
+		Title:     ctx.String("title"),
+		Body:      ctx.String("description"),
+		Assignees: strings.Split(ctx.String("assignees"), ","),
+	}
+	var err error
+
+	date := ctx.String("deadline")
+	if date != "" {
+		t, err := dateparse.ParseAny(date)
+		if err != nil {
+			return nil, err
+		}
+		opts.Deadline = &t
+	}
+
+	client := ctx.Login.Client()
+
+	labelNames := strings.Split(ctx.String("labels"), ",")
+	if len(labelNames) != 0 {
+		if client == nil {
+			client = ctx.Login.Client()
+		}
+		if opts.Labels, err = task.ResolveLabelNames(client, ctx.Owner, ctx.Repo, labelNames); err != nil {
+			return nil, err
+		}
+	}
+
+	if milestoneName := ctx.String("milestone"); len(milestoneName) != 0 {
+		if client == nil {
+			client = ctx.Login.Client()
+		}
+		ms, _, err := client.GetMilestoneByName(ctx.Owner, ctx.Repo, milestoneName)
+		if err != nil {
+			return nil, fmt.Errorf("Milestone '%s' not found", milestoneName)
+		}
+		opts.Milestone = ms.ID
+	}
+
+	return &opts, nil
+}