@indic-transliteration/sanscript/scripts/build.js

Sanscript is a transliteration library for Indian languages. It supports the most popular Indian scripts and several different romanization schemes. Although Sanscript focuses on Sanskrit transliteration, it has partial support for other languages and is

const fsp = require("fs").promises;
const path = require("path");
const toml = require( 'toml' );

async function main () {
    const rootDir = path.dirname(__dirname);

    // 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(rootDir, "node_modules", "@indic-transliteration", "common_maps", x);
            const 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]) => {
            const schemeName = filename.split(".");
            schemeName.pop();
            let fileContents = await fsp.readFile(filepath);
            const schemeObj = toml.parse(fileContents);
            
            if (filepath.match(/\broman\b/)) {
                schemeObj.isRomanScheme = true;
            }
            fileContents = JSON.stringify(schemeObj);
            return [schemeName, fileContents];
        })),
    ));

    let devanagariVowelToMarks = await fsp.readFile(path.join(rootDir, "node_modules", "@indic-transliteration", "common_maps", "_devanagari_vowel_to_marks.toml"));
    devanagariVowelToMarks = JSON.stringify(toml.parse(devanagariVowelToMarks));


    // Get file handle for sanscript.js
    let out;
    try {
        out = await fsp.open(
            path.join(rootDir, "sanscript.es6.js"), "w",
        );
        out.write("const schemes = {};\n");
        for (const [scheme, contents] of bfiles) {
            out.write(`schemes.${scheme} = ${contents.toString().trim()};\n`);
        }
        for (const [scheme, contents] of rfiles) {
            out.write(`schemes.${scheme} = ${contents.toString().trim()};\n`);
        }
        out.write(`const devanagariVowelToMarks = ${devanagariVowelToMarks};`);
        // Write the code to the output file
        out.write(await fsp.readFile(
            path.join(rootDir, "src", "sanscript.js"),
        ));
    } finally {
        if (out !== undefined)
            await out.close();
    }
}

main().catch(console.error);