update go modfile, add tools/text.go file

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/charmbracelet/lipgloss v0.4.0
 	github.com/gorilla/websocket v1.4.2
 	github.com/klauspost/pgzip v1.2.5
+	github.com/muesli/reflow v0.3.0
 	golang.org/x/crypto v0.0.0-20220131195533-30dcbda58838
 )
 
@@ -19,7 +20,6 @@ require (
 	github.com/mattn/go-isatty v0.0.13 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
 	github.com/muesli/ansi v0.0.0-20211018074035-2e021307bc4b // indirect
-	github.com/muesli/reflow v0.3.0 // indirect
 	github.com/muesli/termenv v0.9.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect

tools/text.go

@@ -0,0 +1,63 @@
+package tools
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/muesli/reflow/ansi"
+	"github.com/muesli/reflow/truncate"
+)
+
+var (
+	ellipsis            = "..."
+	minWidthForEllipsis = len(ellipsis) + 2
+	lineRE 				= regexp.MustCompile(`(?m)^`)
+	ws 					= regexp.MustCompile(`\s+`)
+)
+
+func Indent(s, indent string) string {
+	if len(strings.TrimSpace(s)) == 0 {
+		return s
+	}
+
+	return lineRE.ReplaceAllLiteralString(s, indent)
+}
+
+func ReplaceExcessiveWhitespace(s string) string {
+	return ws.ReplaceAllString(strings.TrimSpace(s), " ")
+}
+
+// DisplayWidth calculates what the rendered width of a string may be
+func DisplayWidth(s string) int {
+	return ansi.PrintableRuneWidth(s)
+}
+
+// Truncate shortens a string to fit the maximum display width
+func Truncate(maxWidth int, s string) string {
+	w := DisplayWidth(s)
+	if w <= maxWidth {
+		return s
+	}
+
+	tail := ""
+	if maxWidth >= minWidthForEllipsis {
+		tail = ellipsis
+	}
+
+	r := truncate.StringWithTail(s, uint(maxWidth), tail)
+	if DisplayWidth(r) < maxWidth {
+		r += " "
+	}
+
+	return r
+}
+
+// TruncateColumn replaces the first new line character with an ellipsis
+// and shortens a string to fit the maximum display width
+func TruncateColumn(maxWidth int, s string) string {
+	if i := strings.IndexAny(s, "\r\n"); i >= 0 {
+		s = s[:i] + ellipsis
+	}
+
+	return Truncate(maxWidth, s)
+}