feat(examples): add p/printfdebugging (#2809)

Extracted from #2551.

See #2551 (comment).

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<details><summary>Contributors' checklist...</summary>

- [ ] Added new tests, or not needed, or not feasible
- [ ] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [ ] Updated the official documentation or not needed
- [ ] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

---------

Signed-off-by: moul <[email protected]>

examples/gno.land/p/moul/printfdebugging/color.gno

@@ -0,0 +1,81 @@
+package printfdebugging
+
+// consts copied from https://github.com/fatih/color/blob/main/color.go
+
+// Attribute defines a single SGR Code
+type Attribute int
+
+const Escape = "\x1b"
+
+// Base attributes
+const (
+	Reset Attribute = iota
+	Bold
+	Faint
+	Italic
+	Underline
+	BlinkSlow
+	BlinkRapid
+	ReverseVideo
+	Concealed
+	CrossedOut
+)
+
+const (
+	ResetBold Attribute = iota + 22
+	ResetItalic
+	ResetUnderline
+	ResetBlinking
+	_
+	ResetReversed
+	ResetConcealed
+	ResetCrossedOut
+)
+
+// Foreground text colors
+const (
+	FgBlack Attribute = iota + 30
+	FgRed
+	FgGreen
+	FgYellow
+	FgBlue
+	FgMagenta
+	FgCyan
+	FgWhite
+)
+
+// Foreground Hi-Intensity text colors
+const (
+	FgHiBlack Attribute = iota + 90
+	FgHiRed
+	FgHiGreen
+	FgHiYellow
+	FgHiBlue
+	FgHiMagenta
+	FgHiCyan
+	FgHiWhite
+)
+
+// Background text colors
+const (
+	BgBlack Attribute = iota + 40
+	BgRed
+	BgGreen
+	BgYellow
+	BgBlue
+	BgMagenta
+	BgCyan
+	BgWhite
+)
+
+// Background Hi-Intensity text colors
+const (
+	BgHiBlack Attribute = iota + 100
+	BgHiRed
+	BgHiGreen
+	BgHiYellow
+	BgHiBlue
+	BgHiMagenta
+	BgHiCyan
+	BgHiWhite
+)

examples/gno.land/p/moul/printfdebugging/gno.mod

@@ -0,0 +1,3 @@
+module gno.land/p/demo/printfdebugging
+
+require gno.land/p/demo/ufmt v0.0.0-latest

examples/gno.land/p/moul/printfdebugging/printfdebugging.gno

@@ -0,0 +1,19 @@
+// this package is a joke... or not.
+package printfdebugging
+
+import (
+	"strings"
+
+	"gno.land/p/demo/ufmt"
+)
+
+func BigRedLine(args ...string) {
+	println(ufmt.Sprintf("%s[%dm####################################%s[%dm %s",
+		Escape, int(BgRed), Escape, int(Reset),
+		strings.Join(args, " "),
+	))
+}
+
+func Success() {
+	println("   \033[31mS\033[33mU\033[32mC\033[36mC\033[34mE\033[35mS\033[31mS\033[0m   ")
+}