@thi.ng/tangle/cli.js

Literate programming code block tangling / codegen utility, inspired by org-mode & noweb

import {
  ParseError,
  flag,
  parse,
  usage
} from "@thi.ng/args";
import { readJSON, writeText } from "@thi.ng/file-io";
import { ConsoleLogger } from "@thi.ng/logger";
import { join } from "node:path";
import { tangleFile } from "./tangle.js";
const argOpts = {
  noComments: flag({ default: false, desc: "don't generate comments" }),
  debug: flag({ alias: "d", default: false, desc: "enable debug output" }),
  dryRun: flag({
    default: false,
    desc: "enable dry run (don't overwrite files)"
  })
};
const PKG = readJSON(join(process.argv[2], "package.json"));
const APP_NAME = PKG.name.split("/")[1];
const HEADER = `
 \u2588 \u2588   \u2588           \u2502
\u2588\u2588 \u2588               \u2502
 \u2588 \u2588 \u2588 \u2588   \u2588 \u2588 \u2588 \u2588 \u2502 ${PKG.name} ${PKG.version}
 \u2588 \u2588 \u2588 \u2588 \u2588 \u2588 \u2588 \u2588 \u2588 \u2502 Literate programming code block tangling
                 \u2588 \u2502
               \u2588 \u2588 \u2502
`;
const usageOpts = {
  lineWidth: process.stdout.columns,
  prefix: `${HEADER}
usage: ${APP_NAME} [OPTS] SOURCE-FILES(S) ...
       ${APP_NAME} --help

`,
  showGroupNames: true,
  paramWidth: 20
};
const showUsage = () => {
  process.stderr.write(usage(argOpts, usageOpts));
  process.exit(1);
};
try {
  const result = parse(argOpts, process.argv, { start: 3, usageOpts });
  if (!result) process.exit(1);
  const { result: opts, rest } = result;
  if (!rest.length) showUsage();
  let ctx = {
    logger: new ConsoleLogger("tangle", opts.debug ? "DEBUG" : "INFO"),
    opts: {
      comments: opts.noComments !== true
    }
  };
  for (let file of rest) {
    ctx = tangleFile(file, ctx);
  }
  for (let out in ctx.outputs) {
    writeText(out, ctx.outputs[out], ctx.logger, opts.dryRun);
  }
} catch (e) {
  if (!(e instanceof ParseError)) process.stderr.write(e.message);
  process.exit(1);
}
export {
  APP_NAME,
  HEADER,
  PKG
};