gno.land/p/moul/x/daily/cowsay/v0⧉

1// Package cowsay is an on-chain Gno port of the classic `cowsay` program:2// it builds an ASCII cow with a speech bubble containing a message — as a3// reusable pure package.4//5// Original: cowsay by Tony Monroe (1999), a Perl program later ported to Go6// many times. This package reimplements the core rendering — bubble framing,7// word-wrapping and the cow art — as pure, deterministic string logic.8//9// A live demo of this package (an interactive cow that says whatever you put in10// the path) is at [r/moul/x/daily/cowsaydemo](/r/moul/x/daily/cowsaydemo/v0).11package cowsay1213import (14	"strings"15)1617// defaultMessage is shown when no message is supplied.18const defaultMessage = "Moo!"1920// wrapWidth is the maximum bubble text width (classic cowsay uses 40).21const wrapWidth = 402223// Say returns the full cowsay art (speech bubble + cow) for msg.24// An empty msg falls back to the default message.25func Say(msg string) string {26	msg = strings.TrimSpace(msg)27	if msg == "" {28		msg = defaultMessage29	}30	lines := wrap(msg, wrapWidth)31	return balloon(lines) + cow32}3334// balloon builds the speech bubble around the given (already wrapped) lines.35func balloon(lines []string) string {36	width := maxLen(lines)3738	var b strings.Builder39	// top border: " " + "_"*(width+2)40	b.WriteString(" ")41	b.WriteString(strings.Repeat("_", width+2))42	b.WriteString("\n")4344	n := len(lines)45	for i, ln := range lines {46		left, right := borderChars(i, n)47		b.WriteString(left)48		b.WriteString(" ")49		b.WriteString(ln)50		b.WriteString(strings.Repeat(" ", width-len(ln)))51		b.WriteString(" ")52		b.WriteString(right)53		b.WriteString("\n")54	}5556	// bottom border: " " + "-"*(width+2)57	b.WriteString(" ")58	b.WriteString(strings.Repeat("-", width+2))59	b.WriteString("\n")60	return b.String()61}6263// borderChars picks the left/right bubble characters for line i of n.64// Single line uses < >. Multi-line uses / \ for the first row,65// \ / for the last row, and | | for the middle rows.66func borderChars(i, n int) (string, string) {67	if n == 1 {68		return "<", ">"69	}70	switch i {71	case 0:72		return "/", "\\"73	case n - 1:74		return "\\", "/"75	default:76		return "|", "|"77	}78}7980// wrap splits text into lines no longer than width, breaking on spaces.81// Words longer than width are hard-split.82func wrap(text string, width int) []string {83	words := strings.Fields(text)84	if len(words) == 0 {85		return []string{""}86	}8788	var lines []string89	cur := ""90	for _, w := range words {91		// hard-split a single word that is too long92		for len(w) > width {93			if cur != "" {94				lines = append(lines, cur)95				cur = ""96			}97			lines = append(lines, w[:width])98			w = w[width:]99		}100		if cur == "" {101			cur = w102		} else if len(cur)+1+len(w) <= width {103			cur = cur + " " + w104		} else {105			lines = append(lines, cur)106			cur = w107		}108	}109	if cur != "" {110		lines = append(lines, cur)111	}112	return lines113}114115// maxLen returns the length of the longest line.116func maxLen(lines []string) int {117	m := 0118	for _, ln := range lines {119		if len(ln) > m {120			m = len(ln)121		}122	}123	return m124}125126// cow is the classic happy cow, aligned under the bubble.127const cow = `        \   ^__^128         \  (oo)\_______129            (__)\       )\/\130                ||----w |131                ||     ||132`133