Add TSV support

CHANGELOG.md

@@ -4,6 +4,9 @@ All notable changes to the "CSV" extension will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.1.3] - 2025-06-11
+- Added: TSV file support with automatic tab delimiter.
+
 ## [1.1.2] - 2025-06-11
 - Fixed: fontFamily
 

README.md

@@ -40,6 +40,7 @@ Working with CSV files shouldn’t be a chore. With CSV, you get:
 - **Preserved CSV Integrity:** All modifications respect CSV formatting—no unwanted extra characters or formatting issues.
 - **Optimized for Performance:** Designed for medium-sized datasets, ensuring a smooth editing experience without compromising on functionality.
 - **Large File Support:** Loads big CSVs in chunks so even large datasets open quickly.
+- **TSV Support:** `.tsv` files are recognized automatically and use tabs as the default separator.
 
 ---
 
@@ -56,10 +57,10 @@ Cursor (built on VS Code 1.99) and the latest VS Code releases (1.102).
 - Go to the Extensions view (`Ctrl+Shift+X` or `Cmd+Shift+X` on macOS).
 - Search for **CSV** and click **Install**.
 
-### 2. Open a CSV File
+### 2. Open a CSV or TSV File
 
-- Open any `.csv` file in VS Code.
-- The CSV will automatically load, presenting your file in an interactive grid view.
+- Open any `.csv` or `.tsv` file in VS Code.
+- The file will automatically load, presenting your data in an interactive grid view.
 
 ### 3. Edit and Navigate
 

package.json

@@ -16,6 +16,7 @@
   "categories": ["Data Science", "Programming Languages", "Other"],
   "activationEvents": [
     "onLanguage:csv",
+    "onLanguage:tsv",
     "onCommand:csv.toggleExtension",
     "onCommand:csv.toggleHeader",
     "onCommand:csv.toggleSerialIndex",
@@ -30,6 +31,12 @@
         "extensions": [".csv"],
         "aliases": ["CSV", "csv"],
         "configuration": "./language-configuration.json"
+      },
+      {
+        "id": "tsv",
+        "extensions": [".tsv"],
+        "aliases": ["TSV", "tsv"],
+        "configuration": "./language-configuration.json"
       }
     ],
     "commands": [
@@ -80,7 +87,10 @@
       {
         "viewType": "csv.editor",
         "displayName": "CSV",
-        "selector": [{ "filenamePattern": "*.csv" }]
+        "selector": [
+          { "filenamePattern": "*.csv" },
+          { "filenamePattern": "*.tsv" }
+        ]
       }
     ]
   },

src/extension.ts

@@ -199,8 +199,7 @@
    */
   private async updateDocument(row: number, col: number, value: string) {
     this.isUpdatingDocument = true;
-    const config = vscode.workspace.getConfiguration('csv');
-    const separator = config.get<string>('separator', ',');
+    const separator = this.getSeparator();
     const oldText = this.document.getText();
     const lines = oldText.split(/\r?\n/);
     let editSucceeded = false;
@@ -227,8 +226,8 @@
     if (!editSucceeded) {
       const result = Papa.parse(oldText, { dynamicTyping: false, delimiter: separator });
       const data = result.data as string[][];
       while (data.length <= row) data.push([]);
       while (data[row].length <= col) data[row].push('');
       data[row][col] = value;
       const newCsvText = Papa.unparse(data, { delimiter: separator });
       const fullRange = new vscode.Range(0, 0, this.document.lineCount, this.document.lineCount ? this.document.lineAt(this.document.lineCount - 1).text.length : 0);
@@ -261,14 +260,13 @@
    */
   private async insertColumn(index: number) {
     this.isUpdatingDocument = true;
-    const config = vscode.workspace.getConfiguration('csv');
-    const separator = config.get<string>('separator', ',');
+    const separator = this.getSeparator();
     const text = this.document.getText();
     const result = Papa.parse(text, { dynamicTyping: false, delimiter: separator });
     const data = result.data as string[][];
     for (const row of data) {
       if (index > row.length) {
         while (row.length < index) row.push('');
       }
       row.splice(index, 0, '');
     }
@@ -286,8 +284,7 @@
    */
   private async deleteColumn(index: number) {
     this.isUpdatingDocument = true;
-    const config = vscode.workspace.getConfiguration('csv');
-    const separator = config.get<string>('separator', ',');
+    const separator = this.getSeparator();
     const text = this.document.getText();
     const result = Papa.parse(text, { dynamicTyping: false, delimiter: separator });
     const data = result.data as string[][];
@@ -313,7 +310,7 @@
     this.isUpdatingDocument = true;
 
     const config       = vscode.workspace.getConfiguration('csv');
-    const separator    = config.get<string>('separator', ',');
+    const separator    = this.getSeparator();
     const treatHeader  = config.get<boolean>('treatFirstRowAsHeader', true);
 
     const text   = this.document.getText();
@@ -330,7 +327,7 @@
 
     const cmp = (a: string, b: string) => {
       const na = parseFloat(a), nb = parseFloat(b);
       if (!isNaN(na) && !isNaN(nb)) return na - nb;        // numeric compare
       return a.localeCompare(b, undefined, { sensitivity: 'base' });
     };
 
@@ -364,15 +361,14 @@
    */
   private async insertRow(index: number) {
     this.isUpdatingDocument = true;
-    const config = vscode.workspace.getConfiguration('csv');
-    const separator = config.get<string>('separator', ',');
+    const separator = this.getSeparator();
     const text = this.document.getText();
     const result = Papa.parse(text, { dynamicTyping: false, delimiter: separator });
     const data = result.data as string[][];
     const numColumns = Math.max(...data.map(r => r.length), 0);
     const newRow = Array(numColumns).fill('');
     if (index > data.length) {
       while (data.length < index) data.push(Array(numColumns).fill(''));
     }
     data.splice(index, 0, newRow);
     const newText = Papa.unparse(data, { delimiter: separator });
@@ -389,8 +385,7 @@
    */
   private async deleteRow(index: number) {
     this.isUpdatingDocument = true;
-    const config = vscode.workspace.getConfiguration('csv');
-    const separator = config.get<string>('separator', ',');
+    const separator = this.getSeparator();
     const text = this.document.getText();
     const result = Papa.parse(text, { dynamicTyping: false, delimiter: separator });
     const data = result.data as string[][];
@@ -415,7 +410,7 @@
     const config = vscode.workspace.getConfiguration('csv');
     const treatHeader = config.get<boolean>('treatFirstRowAsHeader', true);
     const addSerialIndex = config.get<boolean>('addSerialIndex', false);
-    const separator = config.get<string>('separator', ',');
+    const separator = this.getSeparator();
     const text = this.document.getText();
     let result;
     try {
@@ -478,8 +473,8 @@
       }
 
       // keep **only** the first chunk in the initial render
       if (treatHeader) bodyData.length = CHUNK_SIZE;
       else             data.length     = CHUNK_SIZE;
     }
     /* ────────── END VIRTUAL-SCROLL SUPPORT ────────── */
 
@@ -1043,6 +1038,19 @@
     return widths;
   }
 
+  /**
+   * Determines the delimiter to use based on configuration and file extension.
+   * `.tsv` files default to a tab separator when the setting is untouched.
+   */
+  private getSeparator(): string {
+    const config = vscode.workspace.getConfiguration('csv');
+    let sep = config.get<string>('separator', ',');
+    if (sep === ',' && this.document?.uri.fsPath.toLowerCase().endsWith('.tsv')) {
+      sep = '\t';
+    }
+    return sep;
+  }
+
   /**
    * Escapes HTML special characters in a string to prevent injection.
    */
@@ -1071,11 +1079,11 @@
     for (const cell of column) {
       const items = cell.split(',').map(item => item.trim());
       for (const item of items){
         if (item === '') continue;
         allEmpty = false;
         const lower = item.toLowerCase();
         if (!(lower === 'true' || lower === 'false')) allBoolean = false;
         if (!this.isDate(item)) allDate = false;
         const num = Number(item);
         if (!Number.isInteger(num)) allInteger = false;
         if (isNaN(num)) allFloat = false;