feat!: refactor the stdlib plot API to build on top of Vega

lib/node_modules/@stdlib/_tools/markdown/img-svg-figure/README.md

@@ -0,0 +1,206 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# Figure Element
+
+> Generate an HTML string for displaying an SVG figure as an image in a GitHub Markdown file.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var createElement = require( '@stdlib/_tools/markdown/img-svg-figure' );
+```
+
+#### createElement( \[options] )
+
+Generates an HTML `string` for displaying an SVG figure as an image in a GitHub Markdown file.
+
+```javascript
+var html = createElement();
+// returns '<div class="figure" align="center" data-figure="">\n    <img src="" alt="">\n    <br>\n</div>'
+```
+
+The function accepts the following `options`:
+
+-   **className**: element class name. Default: `'figure'`.
+-   **align**: element alignment. Default: `'center'`.
+-   **label**: figure label.
+-   **src**: image source URL.
+-   **alt**: alternative image text.
+
+Each `option` corresponds an HTML attribute. For example, to set the image source URL, set the `src` option.
+
+```javascript
+var opts = {
+    'src': 'https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/docs/img/fig1.svg'
+};
+
+var html = createElement( opts );
+// returns '<div class="figure" align="center" data-figure="">\n    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/docs/img/fig1.svg" alt="">\n    <br>\n</div>'
+```
+
+To include a figure label in the element, set the `label` option.
+
+```javascript
+var opts = {
+    'label': 'fig:fig1',
+    'src': 'https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/docs/img/fig1.svg'
+};
+
+var html = createElement( opts );
+// returns '<div class="figure" align="center" data-figure="fig:fig1">\n    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/docs/img/fig1.svg" alt="">\n    <br>\n</div>'
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var createElement = require( '@stdlib/_tools/markdown/img-svg-figure' );
+
+var opts = {
+    'className': 'fig',
+    'align': 'center',
+    'label': 'fig:padding',
+    'src': 'https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/lib/node_modules/@stdlib/plot/vega/padding/ctor/docs/img/figure_padding.svg',
+    'alt': 'A visualization showing padding margins.'
+};
+
+var html = createElement( opts );
+
+console.log( html );
+// => '<div class="fig" align="center" data-figure="fig:padding">\n    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/lib/node_modules/@stdlib/plot/vega/padding/ctor/docs/img/figure_padding.svg" alt="A visualization showing padding margins.">\n    <br>\n</div>'
+```
+
+</section>
+
+<!-- /.examples -->
+
+* * *
+
+<section class="cli">
+
+## CLI
+
+<!-- CLI usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```text
+Usage: ghimgfig [options]
+
+Options:
+
+  -h,  --help               Print this message.
+  -V,  --version            Print the package version.
+       --class name         Element class name. Default: figure.
+       --align alignment    Element alignment. Default: center.
+       --label label        Figure label.
+       --src url            Image source URL.
+       --alt text           Alternative image text.
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- CLI usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- CLI usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```bash
+$ ghimgfig --label 'fig:fig1' --src 'https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/docs/img/fig1.svg'
+<div class="figure" align="center" data-figure="fig:fig1">
+    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/docs/img/fig1.svg" alt="">
+    <br>
+</div>
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.cli -->
+
+<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="references">
+
+</section>
+
+<!-- /.references -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/_tools/markdown/img-svg-figure/bin/cli

@@ -0,0 +1,78 @@
+#!/usr/bin/env node
+
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var join = require( 'path' ).join;
+var readFileSync = require( '@stdlib/fs/read-file' ).sync;
+var CLI = require( '@stdlib/cli/ctor' );
+var createElement = require( './../lib' );
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var flags;
+	var opts;
+	var cli;
+
+	// Create a command-line interface:
+	cli = new CLI({
+		'pkg': require( './../package.json' ),
+		'options': require( './../etc/cli_opts.json' ),
+		'help': readFileSync( join( __dirname, '..', 'docs', 'usage.txt' ), {
+			'encoding': 'utf8'
+		})
+	});
+
+	// Get any provided command-line options:
+	flags = cli.flags();
+	if ( flags.help || flags.version ) {
+		return;
+	}
+
+	// Extract options...
+	opts = {};
+	if ( flags[ 'class' ] ) {
+		opts.className = flags[ 'class' ];
+	}
+	if ( flags.align ) {
+		opts.align = flags.align;
+	}
+	if ( flags.label ) {
+		opts.label = flags.label;
+	}
+	if ( flags.src ) {
+		opts.src = flags.src;
+	}
+	if ( flags.alt ) {
+		opts.alt = flags.alt;
+	}
+	console.log( createElement( opts ) ); // eslint-disable-line no-console
+}
+
+main();

lib/node_modules/@stdlib/_tools/markdown/img-svg-figure/docs/usage.txt

@@ -0,0 +1,13 @@
+
+Usage: ghimgfig [options]
+
+Options:
+
+  -h, --help               Print this message.
+  -V, --version            Print the package version.
+      --class name         Element class name. Default: figure.
+      --align alignment    Element alignment. Default: center.
+      --label label        Figure label.
+      --src url            Image source URL.
+      --alt text           Alternative image text.
+

lib/node_modules/@stdlib/_tools/markdown/img-svg-figure/etc/cli_opts.json

@@ -0,0 +1,21 @@
+{
+	"string": [
+		"class",
+		"align",
+		"label",
+		"src",
+		"alt"
+	],
+	"boolean": [
+		"help",
+		"version"
+	],
+	"alias": {
+		"help": [
+			"h"
+		],
+		"version": [
+			"V"
+		]
+	}
+}

lib/node_modules/@stdlib/_tools/markdown/img-svg-figure/examples/index.js

@@ -0,0 +1,34 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var createElement = require( './../lib' );
+
+var opts = {
+	'className': 'fig',
+	'align': 'center',
+	'label': 'fig:padding',
+	'src': 'https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/lib/node_modules/@stdlib/plot/vega/padding/ctor/docs/img/figure_padding.svg',
+	'alt': 'A visualization showing padding margins.'
+};
+
+var html = createElement( opts );
+
+console.log( html );
+// => '<div class="fig" align="center" data-figure="fig:padding">\n    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@master/lib/node_modules/@stdlib/plot/vega/padding/ctor/docs/img/figure_padding.svg" alt="A visualization showing padding margins.">\n    <br>\n</div>'

lib/node_modules/@stdlib/_tools/markdown/img-svg-figure/lib/defaults.json

@@ -0,0 +1,7 @@
+{
+  "className": "figure",
+  "align": "center",
+  "label": "",
+  "src": "",
+  "alt": ""
+}