60 lines
1.8 KiB
Markdown
60 lines
1.8 KiB
Markdown
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---
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sidebar_position: 13
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title: Command-Line Tools
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---
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import current from '/version.js';
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With the availability of JS engines and the success of server-side runtimes, it
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is natural to want command-line tools for various workflows.
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This demo covers a number of strategies for building standalone processors. The
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goal is to generate CSV output from an arbitrary spreadsheet file.
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## Deno
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`deno compile` generates a standalone executable that includes the entire JS
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runtime as well as user JS code.
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When compiling, the `--allow-read` option must be specified to allow the script
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to read files from the filesystem with `Deno.readFileSync`.
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<details><summary><b>Complete Example</b> (click to show)</summary>
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1) Save the following script to `sheet2csv.ts`:
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```ts title="sheet2csv.ts"
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/*! sheetjs (C) 2013-present SheetJS -- http://sheetjs.com */
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// @deno-types="https://cdn.sheetjs.com/xlsx-latest/package/types/index.d.ts"
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import * as XLSX from 'https://cdn.sheetjs.com/xlsx-latest/package/xlsx.mjs';
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import * as cptable from 'https://cdn.sheetjs.com/xlsx-latest/package/dist/cpexcel.full.mjs';
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XLSX.set_cptable(cptable);
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/* Read and parse workbook */
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const filename = Deno.args[0];
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if(!filename) {
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console.error("usage: sheet2csv <filename> [sheetname]");
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Deno.exit(1);
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}
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const workbook = XLSX.readFile(filename);
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/* Find worksheet */
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const sheetname = Deno.args[1] || workbook.SheetNames[0];
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if(!workbook.Sheets[sheetname]) {
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console.error(`error: workbook missing sheet ${sheetname}`);
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Deno.exit(1);
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}
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/* Generate CSV and print to stdout */
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console.log(XLSX.utils.sheet_to_csv(workbook.Sheets[sheetname]));
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```
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2) Build `sheet2csv` with `deno compile`:
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```bash
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deno compile -r --allow-read sheet2csv.ts
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```
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`sheet2csv` is a generated executable that you can run.
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</details>
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