Add test for utf8, japanese characters and emojis

annot.go

@@ -5,7 +5,8 @@ import (
 	"io"
 	"slices"
 	"strings"
-	"unicode/utf8"
+
+	"github.com/rivo/uniseg"
 )
 
 // Annot annotates information with a text (represented in Lines)
@@ -88,7 +89,7 @@ func Write(w io.Writer, annots ...*Annot) error {
 		a.lines = make([]*line, len(a.Lines))
 		for i := range a.Lines {
 			a.lines[i] = &line{
-				length:        utf8.RuneCountInString(a.Lines[i]),
+				length:        uniseg.StringWidth(a.Lines[i]),
 				leadingSpaces: a.Col,
 			}
 		}

annot_test.go

@@ -82,6 +82,19 @@ func TestWrite(t *testing.T) {
    line3
    line4
    line5
+`,
+			wantErr: false,
+		},
+		{
+			name: "utf8, japanese characters and emojis",
+			annots: []*Annot{
+				{Col: 0, Lines: []string{"⭐️漢", "æñ🥏NJ"}},
+				{Col: 10, Lines: []string{"æñŶǼNJ", "字ñŶǼNJ"}},
+			},
+			wantW: `
+↑         ↑
+└─ ⭐️漢   └─ æñŶǼNJ
+   æñ🥏NJ     字ñŶǼNJ
 `,
 			wantErr: false,
 		},

go.mod

@@ -1,3 +1,5 @@
 module github.com/meyermarcel/annot
 
 go 1.22
+
+require github.com/rivo/uniseg v0.4.7

go.sum

@@ -0,0 +1,2 @@
+github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
+github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=