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
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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>

modules/print/markdown.go

@@ -0,0 +1,62 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package print
+
+import (
+	"fmt"
+	"os"
+
+	"charm.land/glamour/v2"
+	"golang.org/x/term"
+)
+
+// outputMarkdown prints markdown to stdout, formatted for terminals.
+// If the input could not be parsed, it is printed unformatted, the error
+// is returned anyway.
+func outputMarkdown(markdown string, baseURL string) error {
+	var renderer *glamour.TermRenderer
+	var err error
+	if IsInteractive() {
+		renderer, err = glamour.NewTermRenderer(
+			glamour.WithBaseURL(baseURL),
+			glamour.WithPreservedNewLines(),
+			glamour.WithWordWrap(getWordWrap()),
+		)
+	} else {
+		renderer, err = glamour.NewTermRenderer(
+			glamour.WithStandardStyle("notty"),
+			glamour.WithBaseURL(baseURL),
+			glamour.WithPreservedNewLines(),
+			glamour.WithWordWrap(getWordWrap()),
+		)
+	}
+
+	if err != nil {
+		fmt.Print(markdown)
+		return err
+	}
+
+	out, err := renderer.Render(markdown)
+	if err != nil {
+		fmt.Print(markdown)
+		return err
+	}
+	fmt.Print(out)
+	return nil
+}
+
+// stolen from https://github.com/charmbracelet/glow/blob/e9d728c/main.go#L152-L165
+func getWordWrap() int {
+	fd := int(os.Stdout.Fd())
+	width := 80
+	if term.IsTerminal(fd) {
+		if w, _, err := term.GetSize(fd); err == nil {
+			width = w
+		}
+	}
+	if width > 120 {
+		width = 120
+	}
+	return width
+}