Move schemes into separate JSON files (#13)

This has the benefits of separating data from code and of having a
language-agnostic specification of schemes (for implementations of
Sanscript in other programming languages).

This also adds a build step integrating the scheme data into the JS file
-- the file that now contains only the code has been moved to a
subdirectory and the build step (npm run dist) outputs to sanscript.js
(so this causes no breaking changes).

.gitignore

@@ -1,2 +1,3 @@
 *.*~
 node_modules
+/sanscript.js

dist.js

@@ -0,0 +1,54 @@
+const fsp = require("fs").promises;
+const path = require("path");
+
+async function main() {
+    // Get lists of Brahmic and roman schemes
+    // Each of bschemes and rschemes is an array of which each element is of
+    // the form [filename, filepath]
+    const [bschemes, rschemes] = await Promise.all(
+        ["brahmic", "roman"].map(async x => {
+            const dirpath = path.join(__dirname, "src", "schemes", x)
+            let paths = [];
+            for (const filename of await fsp.readdir(dirpath)) {
+                paths.push([filename, path.join(dirpath, filename)]);
+            }
+            return paths;
+        })
+    );
+
+    // Get arrays of Brahmic and roman scheme file contents
+    // Each of bfiles and rfiles is an array of which each element is of the
+    // form [schemeName, fileContents]
+    const [bfiles, rfiles] = await Promise.all([bschemes, rschemes].map(x =>
+        Promise.all(x.map(async ([filename, filepath]) => {
+            let schemeName = filename.split(".");
+            schemeName.pop();
+            const fileContents = await fsp.readFile(filepath);
+            return [schemeName, fileContents];
+        }))
+    ));
+
+    // Get file handle for sanscript.js
+    let out;
+    try {
+        out = await fsp.open(
+            path.join(__dirname, "sanscript.js"), "w"
+        );
+        out.write("var schemes = {};\n");
+        for (const [scheme, contents] of bfiles) {
+            out.write(`schemes.${scheme} = ${contents};\n`);
+        }
+        for (const [scheme, contents] of rfiles) {
+            out.write(`schemes.${scheme} = ${contents};\n`);
+        }
+        // Write the code to the output file
+        out.write(await fsp.readFile(
+            path.join(__dirname, "src", "sanscript.js")
+        ));
+    } finally {
+        if (out !== undefined)
+            await out.close();
+    }
+}
+
+main().catch(console.error);

package.json

@@ -7,7 +7,8 @@
     "test": "test"
   },
   "scripts": {
-    "test": "qunit"
+    "test": "qunit",
+    "dist": "node dist.js"
   },
   "repository": {
     "type": "git",