feat: use go tool

node_modules/string-width/index.js

@@ -0,0 +1,89 @@
+import stripAnsi from 'strip-ansi';
+import {eastAsianWidth} from 'get-east-asian-width';
+
+/**
+Logic:
+- Segment graphemes to match how terminals render clusters.
+- Width rules:
+	1. Skip non-printing clusters (Default_Ignorable, Control, pure Mark, lone Surrogates). Tabs are ignored by design.
+	2. RGI emoji clusters (\p{RGI_Emoji}) are double-width.
+	3. Otherwise use East Asian Width of the cluster’s first visible code point, and add widths for trailing Halfwidth/Fullwidth Forms within the same cluster (e.g., dakuten/handakuten/prolonged sound mark).
+*/
+
+const segmenter = new Intl.Segmenter();
+
+// Whole-cluster zero-width
+const zeroWidthClusterRegex = /^(?:\p{Default_Ignorable_Code_Point}|\p{Control}|\p{Mark}|\p{Surrogate})+$/v;
+
+// Pick the base scalar if the cluster starts with Prepend/Format/Marks
+const leadingNonPrintingRegex = /^[\p{Default_Ignorable_Code_Point}\p{Control}\p{Format}\p{Mark}\p{Surrogate}]+/v;
+
+// RGI emoji sequences
+const rgiEmojiRegex = /^\p{RGI_Emoji}$/v;
+
+function baseVisible(segment) {
+	return segment.replace(leadingNonPrintingRegex, '');
+}
+
+function isZeroWidthCluster(segment) {
+	return zeroWidthClusterRegex.test(segment);
+}
+
+function trailingHalfwidthWidth(segment, eastAsianWidthOptions) {
+	let extra = 0;
+	if (segment.length > 1) {
+		for (const char of segment.slice(1)) {
+			if (char >= '\uFF00' && char <= '\uFFEF') {
+				extra += eastAsianWidth(char.codePointAt(0), eastAsianWidthOptions);
+			}
+		}
+	}
+
+	return extra;
+}
+
+export default function stringWidth(input, options = {}) {
+	if (typeof input !== 'string' || input.length === 0) {
+		return 0;
+	}
+
+	const {
+		ambiguousIsNarrow = true,
+		countAnsiEscapeCodes = false,
+	} = options;
+
+	let string = input;
+
+	if (!countAnsiEscapeCodes) {
+		string = stripAnsi(string);
+	}
+
+	if (string.length === 0) {
+		return 0;
+	}
+
+	let width = 0;
+	const eastAsianWidthOptions = {ambiguousAsWide: !ambiguousIsNarrow};
+
+	for (const {segment} of segmenter.segment(string)) {
+		// Zero-width / non-printing clusters
+		if (isZeroWidthCluster(segment)) {
+			continue;
+		}
+
+		// Emoji width logic
+		if (rgiEmojiRegex.test(segment)) {
+			width += 2;
+			continue;
+		}
+
+		// Everything else: EAW of the cluster’s first visible scalar
+		const codePoint = baseVisible(segment).codePointAt(0);
+		width += eastAsianWidth(codePoint, eastAsianWidthOptions);
+
+		// Add width for trailing Halfwidth and Fullwidth Forms (e.g., ﾞ, ﾟ, ｰ)
+		width += trailingHalfwidthWidth(segment, eastAsianWidthOptions);
+	}
+
+	return width;
+}