revert: tea 1.0 rewrite (#1122–#1126) (#1146)

Reverts #1126, #1125, #1124, #1123 and #1122.

`go.mod` keeps the Go 1.26 line with toolchain `go1.26.9` (instead of the original `go1.26.6`) so the security fix from #1131 isn't lost.

reopens #69
reopens #141
reopens #162
reopens #172
reopens #197
reopens #232
reopens #240
reopens #246
reopens #323
reopens #325
reopens #326
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reopens #831
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reopens #1050
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reopens #1069
reopens #1073
reopens #1087
reopens #1091
reopens #1094
reopens #1110
reopens #1115
reopens #1116
reopens #1118

Reviewed-on: https://gitea.com/gitea/tea/pulls/1146
Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>

main.go

@@ -1,31 +1,45 @@
 // Copyright 2020 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-// Tea is a scriptable command line tool for Gitea.
-package main
+// Tea is command line tool for Gitea.
+package main // import "gitea.dev/tea"
 
 import (
 	"context"
 	"errors"
 	"fmt"
 	"os"
-	"os/signal"
-	"syscall"
 
-	"gitea.dev/tea/internal/app"
-	"gitea.dev/tea/internal/clierr"
+	"gitea.dev/tea/cmd"
+	teacontext "gitea.dev/tea/modules/context"
+	"gitea.dev/tea/modules/debug"
 )
 
 func main() {
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop()
-	deps := app.System()
-	err := app.Execute(ctx, deps, os.Args[1:])
-	if ctx.Err() != nil && errors.Is(err, context.Canceled) {
-		err = clierr.Wrap(clierr.Interrupted, err)
-	}
+	app := cmd.App()
+	app.Flags = append(app.Flags, debug.CliFlag())
+	err := app.Run(context.Background(), preprocessArgs(os.Args))
 	if err != nil {
-		fmt.Fprintf(deps.Streams.ErrOut, "Error: %v\n", err)
+		if errors.Is(err, teacontext.ErrCommandCanceled) {
+			os.Exit(0)
+		}
+		// app.Run already exits for errors implementing ErrorCoder,
+		// so we only handle generic errors with code 1 here.
+		fmt.Fprintf(app.ErrWriter, "Error: %v\n", err)
+		os.Exit(1)
 	}
-	os.Exit(clierr.ExitCode(err))
+}
+
+// preprocessArgs normalizes command-line arguments.
+// Converts "-o-" to "-o -" for the api command's output flag.
+func preprocessArgs(args []string) []string {
+	result := make([]string, 0, len(args)+1)
+	for _, arg := range args {
+		if arg == "-o-" {
+			result = append(result, "-o", "-")
+		} else {
+			result = append(result, arg)
+		}
+	}
+	return result
 }