feat: add vfm cli

packages/vfm/package.json

@@ -4,13 +4,14 @@
   "version": "1.0.0-alpha.2",
   "author": "Yasuaki Uechi <y@uechi.io>",
   "scripts": {
-    "build": "shx rm -rf lib && tsc",
+    "build": "shx rm -rf lib && tsc && shx chmod +x lib/cli.js",
     "test": "jest"
   },
   "dependencies": {
     "debug": "^4.1.1",
     "hast-util-is-element": "^1.0.4",
     "hastscript": "^5.1.2",
+    "meow": "^7.0.1",
     "rehype-document": "^5.0.0",
     "rehype-mathjax": "^2.0.0",
     "rehype-raw": "^4.0.2",
@@ -49,6 +50,7 @@
     "directory": "packages/vfm"
   },
   "license": "Apache-2.0",
+  "bin": "lib/cli.js",
   "homepage": "https://github.com/vivliostyle/vfm",
   "keywords": [
     "markdown",

packages/vfm/src/cli.ts

@@ -0,0 +1,72 @@
+#!/usr/bin/env node
+
+import fs from 'fs';
+import readline from 'readline';
+import meow from 'meow';
+import {stringify} from '.';
+
+const cli = meow(
+  `
+    Usage
+      $ vfm <filename>
+      $ echo <string> | vfm
+ 
+    Options
+      --partial, -r  Output markdown fragments
+      --stylesheet   Custom stylesheet path/URL
+ 
+    Examples
+      $ vfm input.md
+`,
+  {
+    flags: {
+      partial: {
+        type: 'boolean',
+        alias: 'p',
+      },
+      stylesheet: {
+        type: 'string',
+      },
+    },
+  },
+);
+
+function convert(
+  input: string,
+  flags: meow.TypedFlags<{
+    partial: {type: 'boolean'; alias: string};
+    stylesheet: {type: 'string'; alias: string};
+  }> & {
+    [name: string]: unknown;
+  },
+) {
+  return stringify(input, {
+    partial: flags.partial,
+    stylesheet: flags.stylesheet,
+  });
+}
+
+function main() {
+  try {
+    const filepath = cli.input[0];
+
+    if (filepath) {
+      return console.log(
+        convert(fs.readFileSync(filepath).toString(), cli.flags),
+      );
+    }
+
+    const rl = readline.createInterface({
+      input: process.stdin,
+      output: process.stdout,
+      terminal: false,
+    });
+    rl.on('line', function (line) {
+      console.log(convert(line, cli.flags));
+    });
+  } catch (err) {
+    console.log(err.message);
+  }
+}
+
+main();

yarn.lock

@@ -5047,7 +5047,7 @@ meow@^4.0.0:
     redent "^2.0.0"
     trim-newlines "^2.0.0"
 
-meow@^7.0.0:
+meow@^7.0.0, meow@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/meow/-/meow-7.0.1.tgz#1ed4a0a50b3844b451369c48362eb0515f04c1dc"
   integrity sha512-tBKIQqVrAHqwit0vfuFPY3LlzJYkEOFyKa3bPgxzNl6q/RtN8KQ+ALYEASYuFayzSAsjlhXj/JZ10rH85Q6TUw==