init claude-code

ink/tabstops.ts

@@ -0,0 +1,46 @@
+// Tab expansion, inspired by Ghostty's Tabstops.zig
+// Uses 8-column intervals (POSIX default, hardcoded in terminals like Ghostty)
+
+import { stringWidth } from './stringWidth.js'
+import { createTokenizer } from './termio/tokenize.js'
+
+const DEFAULT_TAB_INTERVAL = 8
+
+export function expandTabs(
+  text: string,
+  interval = DEFAULT_TAB_INTERVAL,
+): string {
+  if (!text.includes('\t')) {
+    return text
+  }
+
+  const tokenizer = createTokenizer()
+  const tokens = tokenizer.feed(text)
+  tokens.push(...tokenizer.flush())
+
+  let result = ''
+  let column = 0
+
+  for (const token of tokens) {
+    if (token.type === 'sequence') {
+      result += token.value
+    } else {
+      const parts = token.value.split(/(\t|\n)/)
+      for (const part of parts) {
+        if (part === '\t') {
+          const spaces = interval - (column % interval)
+          result += ' '.repeat(spaces)
+          column += spaces
+        } else if (part === '\n') {
+          result += part
+          column = 0
+        } else {
+          result += part
+          column += stringWidth(part)
+        }
+      }
+    }
+  }
+
+  return result
+}