Refactor to use urfave/cli/v2 (#25959)

Replace #10912

And there are many new tests to cover the CLI behavior

There were some concerns about the "option order in hook scripts"
(https://github.com/go-gitea/gitea/pull/10912#issuecomment-1137543314),
it's not a problem now. Because the hook script uses `/gitea hook
--config=/app.ini pre-receive` format. The "config" is a global option,
it can appear anywhere.

----

## ⚠️ BREAKING ⚠️

This PR does it best to avoid breaking anything. The major changes are:

* `gitea` itself won't accept web's options: `--install-port` / `--pid`
/ `--port` / `--quiet` / `--verbose` .... They are `web` sub-command's
options.
    * Use `./gitea web --pid ....` instead
* `./gitea` can still run the `web` sub-command as shorthand, with
default options
* The sub-command's options must follow the sub-command
* Before: `./gitea --sub-opt subcmd` might equal to `./gitea subcmd
--sub-opt` (well, might not ...)
    * After: only `./gitea subcmd --sub-opt` could be used
    * The global options like `--config` are not affected

cmd/manager_logging.go

@@ -10,49 +10,61 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/private"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 var (
 	defaultLoggingFlags = []cli.Flag{
-		cli.StringFlag{
+		&cli.StringFlag{
 			Name:  "logger",
 			Usage: `Logger name - will default to "default"`,
-		}, cli.StringFlag{
+		},
+		&cli.StringFlag{
 			Name:  "writer",
 			Usage: "Name of the log writer - will default to mode",
-		}, cli.StringFlag{
+		},
+		&cli.StringFlag{
 			Name:  "level",
 			Usage: "Logging level for the new logger",
-		}, cli.StringFlag{
-			Name:  "stacktrace-level, L",
-			Usage: "Stacktrace logging level",
-		}, cli.StringFlag{
-			Name:  "flags, F",
-			Usage: "Flags for the logger",
-		}, cli.StringFlag{
-			Name:  "expression, e",
-			Usage: "Matching expression for the logger",
-		}, cli.StringFlag{
-			Name:  "prefix, p",
-			Usage: "Prefix for the logger",
-		}, cli.BoolFlag{
+		},
+		&cli.StringFlag{
+			Name:    "stacktrace-level",
+			Aliases: []string{"L"},
+			Usage:   "Stacktrace logging level",
+		},
+		&cli.StringFlag{
+			Name:    "flags",
+			Aliases: []string{"F"},
+			Usage:   "Flags for the logger",
+		},
+		&cli.StringFlag{
+			Name:    "expression",
+			Aliases: []string{"e"},
+			Usage:   "Matching expression for the logger",
+		},
+		&cli.StringFlag{
+			Name:    "prefix",
+			Aliases: []string{"p"},
+			Usage:   "Prefix for the logger",
+		},
+		&cli.BoolFlag{
 			Name:  "color",
 			Usage: "Use color in the logs",
-		}, cli.BoolFlag{
+		},
+		&cli.BoolFlag{
 			Name: "debug",
 		},
 	}
 
-	subcmdLogging = cli.Command{
+	subcmdLogging = &cli.Command{
 		Name:  "logging",
 		Usage: "Adjust logging commands",
-		Subcommands: []cli.Command{
+		Subcommands: []*cli.Command{
 			{
 				Name:  "pause",
 				Usage: "Pause logging (Gitea will buffer logs up to a certain point and will drop them after that point)",
 				Flags: []cli.Flag{
-					cli.BoolFlag{
+					&cli.BoolFlag{
 						Name: "debug",
 					},
 				},
@@ -61,7 +73,7 @@ var (
 				Name:  "resume",
 				Usage: "Resume logging",
 				Flags: []cli.Flag{
-					cli.BoolFlag{
+					&cli.BoolFlag{
 						Name: "debug",
 					},
 				},
@@ -70,7 +82,7 @@ var (
 				Name:  "release-and-reopen",
 				Usage: "Cause Gitea to release and re-open files used for logging",
 				Flags: []cli.Flag{
-					cli.BoolFlag{
+					&cli.BoolFlag{
 						Name: "debug",
 					},
 				},
@@ -80,9 +92,9 @@ var (
 				Usage:     "Remove a logger",
 				ArgsUsage: "[name] Name of logger to remove",
 				Flags: []cli.Flag{
-					cli.BoolFlag{
+					&cli.BoolFlag{
 						Name: "debug",
-					}, cli.StringFlag{
+					}, &cli.StringFlag{
 						Name:  "logger",
 						Usage: `Logger name - will default to "default"`,
 					},
@@ -91,32 +103,45 @@ var (
 			}, {
 				Name:  "add",
 				Usage: "Add a logger",
-				Subcommands: []cli.Command{
+				Subcommands: []*cli.Command{
 					{
 						Name:  "file",
 						Usage: "Add a file logger",
 						Flags: append(defaultLoggingFlags, []cli.Flag{
-							cli.StringFlag{
-								Name:  "filename, f",
-								Usage: "Filename for the logger - this must be set.",
-							}, cli.BoolTFlag{
-								Name:  "rotate, r",
-								Usage: "Rotate logs",
-							}, cli.Int64Flag{
-								Name:  "max-size, s",
-								Usage: "Maximum size in bytes before rotation",
-							}, cli.BoolTFlag{
-								Name:  "daily, d",
-								Usage: "Rotate logs daily",
-							}, cli.IntFlag{
-								Name:  "max-days, D",
-								Usage: "Maximum number of daily logs to keep",
-							}, cli.BoolTFlag{
-								Name:  "compress, z",
-								Usage: "Compress rotated logs",
-							}, cli.IntFlag{
-								Name:  "compression-level, Z",
-								Usage: "Compression level to use",
+							&cli.StringFlag{
+								Name:    "filename",
+								Aliases: []string{"f"},
+								Usage:   "Filename for the logger - this must be set.",
+							},
+							&cli.BoolFlag{
+								Name:    "rotate",
+								Aliases: []string{"r"},
+								Usage:   "Rotate logs",
+							},
+							&cli.Int64Flag{
+								Name:    "max-size",
+								Aliases: []string{"s"},
+								Usage:   "Maximum size in bytes before rotation",
+							},
+							&cli.BoolFlag{
+								Name:    "daily",
+								Aliases: []string{"d"},
+								Usage:   "Rotate logs daily",
+							},
+							&cli.IntFlag{
+								Name:    "max-days",
+								Aliases: []string{"D"},
+								Usage:   "Maximum number of daily logs to keep",
+							},
+							&cli.BoolFlag{
+								Name:    "compress",
+								Aliases: []string{"z"},
+								Usage:   "Compress rotated logs",
+							},
+							&cli.IntFlag{
+								Name:    "compression-level",
+								Aliases: []string{"Z"},
+								Usage:   "Compression level to use",
 							},
 						}...),
 						Action: runAddFileLogger,
@@ -124,18 +149,25 @@ var (
 						Name:  "conn",
 						Usage: "Add a net conn logger",
 						Flags: append(defaultLoggingFlags, []cli.Flag{
-							cli.BoolFlag{
-								Name:  "reconnect-on-message, R",
-								Usage: "Reconnect to host for every message",
-							}, cli.BoolFlag{
-								Name:  "reconnect, r",
-								Usage: "Reconnect to host when connection is dropped",
-							}, cli.StringFlag{
-								Name:  "protocol, P",
-								Usage: "Set protocol to use: tcp, unix, or udp (defaults to tcp)",
-							}, cli.StringFlag{
-								Name:  "address, a",
-								Usage: "Host address and port to connect to (defaults to :7020)",
+							&cli.BoolFlag{
+								Name:    "reconnect-on-message",
+								Aliases: []string{"R"},
+								Usage:   "Reconnect to host for every message",
+							},
+							&cli.BoolFlag{
+								Name:    "reconnect",
+								Aliases: []string{"r"},
+								Usage:   "Reconnect to host when connection is dropped",
+							},
+							&cli.StringFlag{
+								Name:    "protocol",
+								Aliases: []string{"P"},
+								Usage:   "Set protocol to use: tcp, unix, or udp (defaults to tcp)",
+							},
+							&cli.StringFlag{
+								Name:    "address",
+								Aliases: []string{"a"},
+								Usage:   "Host address and port to connect to (defaults to :7020)",
 							},
 						}...),
 						Action: runAddConnLogger,
@@ -145,9 +177,10 @@ var (
 				Name:  "log-sql",
 				Usage: "Set LogSQL",
 				Flags: []cli.Flag{
-					cli.BoolFlag{
+					&cli.BoolFlag{
 						Name: "debug",
-					}, cli.BoolFlag{
+					},
+					&cli.BoolFlag{
 						Name:  "off",
 						Usage: "Switch off SQL logging",
 					},