43 lines
1.4 KiB
TypeScript
43 lines
1.4 KiB
TypeScript
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/**
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* Cleans up terminal selections for pasting into other tools.
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*
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* Terminal UI padding (left margin from the xterm container, alignment spaces
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* at end of line) ends up in the copied text. This helper removes that cruft
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* while preserving the *relative* indentation of the content — so code blocks
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* keep their shape but lose the wrapper padding.
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*
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* Steps:
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* 1. Dedent — strip the common leading whitespace count from every line.
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* 2. trimEnd — drop trailing whitespace per line.
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* 3. Drop fully-blank leading and trailing lines.
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*
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* Internal newlines and relative indentation are preserved. Pure function.
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*/
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export function trimSelection(text: string): string {
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if (!text) return text;
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const lines = text.split("\n");
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let minIndent = Infinity;
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for (const line of lines) {
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if (line.trim() === "") continue;
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const match = line.match(/^[ \t]*/);
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const indent = match ? match[0].length : 0;
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if (indent < minIndent) minIndent = indent;
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if (minIndent === 0) break;
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}
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if (!Number.isFinite(minIndent)) minIndent = 0;
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const processed = lines.map((line) => {
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const afterDedent = line.length >= minIndent ? line.slice(minIndent) : "";
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return afterDedent.trimEnd();
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});
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let start = 0;
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let end = processed.length;
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while (start < end && processed[start] === "") start++;
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while (end > start && processed[end - 1] === "") end--;
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return processed.slice(start, end).join("\n");
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}
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