add core function

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab

.gitignore

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+node_modules

package.json

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+{
+  "name": "fontasy",
+  "license": "MIT",
+  "dependencies": {
+    "mz": "^2.4.0",
+    "stream-to-promise": "^2.2.0",
+    "svg2ttf": "^4.0.1",
+    "svgicons2svgfont": "^5.0.0",
+    "ttf2eot": "^2.0.0",
+    "ttf2woff": "^2.0.1",
+    "ttf2woff2": "^2.0.3",
+    "yargs": "^4.8.1"
+  }
+}

src/index.js

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+const fs = require("mz/fs");
+const path = require("path");
+const streamToPromise = require("stream-to-promise");
+const svgicons2svgfont = require("svgicons2svgfont");
+const svg2ttf = require("svg2ttf");
+const ttf2eot = require("ttf2eot");
+const ttf2woff = require("ttf2woff");
+const ttf2woff2 = require("ttf2woff2");
+
+function toSvgFont(files, options) {
+  const stream = svgicons2svgfont(Object.assign({}, options));
+  const promise = streamToPromise(stream);
+  files.sort().forEach(file => {
+    const name = path.basename(file, ".svg");
+    const glyph = fs.createReadStream(file);
+    glyph.metadata = {
+      name,
+      unicode: [name]
+    };
+    stream.write(glyph);
+  });
+  stream.end();
+  return promise.then(data => data.toString());
+}
+
+const defaultOptions = {
+  outputDir: ".",
+  fontName: "iconfont",
+  fontId: undefined,
+  fontStyle: '',
+  fontWeight: '',
+  fixedWidth: false,
+  centerHorizontally: false,
+  fontHeight: undefined,
+  round: undefined,
+  descent: undefined,
+  ascent: undefined,
+  metadata: "Created by Fontasy.",
+};
+
+module.exports = function(files, options) {
+  options = Object.assign({}, defaultOptions, options);
+  const baseName = path.join(options.outputDir, options.fontName);
+  return Promise.resolve()
+    .then(() => toSvgFont(files, options))
+    .then(svg => {
+      const fonts = {};
+      fonts.svg = svg;
+      fonts.ttf = new Buffer(svg2ttf(fonts.svg).buffer);
+      fonts.eot = new Buffer(ttf2eot(new Uint8Array(fonts.ttf)).buffer);
+      fonts.woff = new Buffer(ttf2woff(new Uint8Array(fonts.ttf), options).buffer);
+      fonts.woff2 = ttf2woff2(fonts.ttf);
+      return fonts;
+    })
+    .then(fonts => {
+      return Promise.all([
+        fs.writeFile(baseName + ".svg", fonts.svg),
+        fs.writeFile(baseName + ".ttf", fonts.ttf, "binary"),
+        fs.writeFile(baseName + ".eot", fonts.eot, "binary"),
+        fs.writeFile(baseName + ".woff", fonts.woff, "binary"),
+        fs.writeFile(baseName + ".woff2", fonts.woff2, "binary"),
+      ]);
+    });
+};