Add double-quote aware CSV parsing and column copy button

- CsvParser._parseRow() now handles quoted fields: commas inside
  double quotes are treated as literal, and "" is an escaped quote.
- Empty lines are filtered out during parsing.
- Each header cell gets a copy button (clipboard icon) that appears
  on hover, right-aligned. Clicking it copies the entire column
  (header + all data rows) joined by newlines to the clipboard.
- Styling: button is absolutely positioned, fades in on header hover,
  uses Obsidian CSS variables for theming.

Co-authored-by: Shelley <shelley@exe.dev>

main.js

@@ -2,8 +2,56 @@ const { Plugin } = require('obsidian');
 
 class CsvParser {
 	constructor(lines) {
-		let rows = lines.split("\n");
-		this._cells = rows.map((l) => l.split(","));
+		let rows = lines.split("\n").filter((l) => l.length > 0);
+		this._cells = rows.map((l) => this._parseRow(l));
+	}
+
+	_parseRow(line) {
+		const cells = [];
+		let i = 0;
+		while (i <= line.length) {
+			if (i === line.length) {
+				// trailing comma produced an empty final field
+				break;
+			}
+			if (line[i] === '"') {
+				// quoted field
+				i++; // skip opening quote
+				let value = '';
+				while (i < line.length) {
+					if (line[i] === '"') {
+						if (i + 1 < line.length && line[i + 1] === '"') {
+							// escaped double quote
+							value += '"';
+							i += 2;
+						} else {
+							// closing quote
+							i++; // skip closing quote
+							break;
+						}
+					} else {
+						value += line[i];
+						i++;
+					}
+				}
+				cells.push(value);
+				// skip comma after closing quote
+				if (i < line.length && line[i] === ',') {
+					i++;
+				}
+			} else {
+				// unquoted field
+				let end = line.indexOf(',', i);
+				if (end === -1) {
+					cells.push(line.substring(i));
+					i = line.length;
+				} else {
+					cells.push(line.substring(i, end));
+					i = end + 1;
+				}
+			}
+		}
+		return cells;
 	}
 
 	cells() {
@@ -11,6 +59,8 @@ class CsvParser {
 	}
 }
 
+const COPY_ICON_SVG = '<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2" ry="2"></rect><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"></path></svg>';
+
 class CsvPlugin extends Plugin {
 	async onload() {
 		this.addStyle();
@@ -22,18 +72,43 @@ class CsvPlugin extends Plugin {
 			table.addClass('csv-table');
 
 			let cp = new CsvParser(source);
+			let allCells = cp.cells();
 			let twrap = null;
 
-			for (let row of cp.cells()) {
+			for (let rowIdx = 0; rowIdx < allCells.length; rowIdx++) {
+				let row = allCells[rowIdx];
 				if (twrap == null) {
 					twrap = table.createEl('thead');
-				}  else if (twrap.nodeName == 'THEAD') {
+				} else if (twrap.nodeName == 'THEAD') {
 					twrap = table.createEl('tbody');
 				}
 
 				let rowElem = twrap.createEl('tr');
-				for (let col of row) {
-					rowElem.createEl('td', { text: col });
+				for (let colIdx = 0; colIdx < row.length; colIdx++) {
+					let col = row[colIdx];
+					if (rowIdx === 0) {
+						// Header cell with copy button
+						let td = rowElem.createEl('td');
+						td.addClass('csv-table-header');
+						td.createEl('span', { text: col });
+
+						let btn = td.createEl('button');
+						btn.addClass('csv-copy-btn');
+						btn.setAttribute('aria-label', 'Copy column');
+						btn.innerHTML = COPY_ICON_SVG;
+
+						const ci = colIdx;
+						btn.addEventListener('click', (e) => {
+							e.preventDefault();
+							e.stopPropagation();
+							let columnText = allCells
+								.map((r) => (ci < r.length ? r[ci] : ''))
+								.join('\n');
+							navigator.clipboard.writeText(columnText);
+						});
+					} else {
+						rowElem.createEl('td', { text: col });
+					}
 				}
 			}
 		});

styles.css

@@ -15,3 +15,33 @@ div.csv-table-wrapper {
 	border: 1px solid var(--background-modifier-border);
 	padding: 4px 8px;
 }
+
+.csv-table-header {
+	position: relative;
+	padding-right: 28px !important;
+}
+
+.csv-copy-btn {
+	position: absolute;
+	right: 4px;
+	top: 50%;
+	transform: translateY(-50%);
+	background: none;
+	border: none;
+	cursor: pointer;
+	padding: 2px;
+	border-radius: 4px;
+	line-height: 0;
+	color: var(--text-muted);
+	opacity: 0;
+	transition: opacity 0.15s ease;
+}
+
+.csv-table-header:hover .csv-copy-btn {
+	opacity: 1;
+}
+
+.csv-copy-btn:hover {
+	background: var(--background-modifier-hover);
+	color: var(--text-normal);
+}