Polyglot Programming - TS, Go, and Rust

Time to tie it all together

The last part is to take this little library we wrote and make it do the actual operations.

For add and remove, they both need to update the config file which may or may not exist.

For print operations, we need to simply print off the results

The ascii diagram again.

                                                  v <-- you are here
                                                        such clossness
                                                        much progress
   +----------+    +----------+      +----------+    +----------+
   | cli opts | -> | project  | -+-> |  print   | -> | display  |
   +----------+    |  config  |  |   +----------+    +----------+
                   +----------+  |
                                 |   +----------+    +----------+
                                 +-> |   add    | -> |   save   |
                                 |   +----------+    +----------+
                                 |
                                 |   +----------+    +----------+
                                 +-> |    rm    | -> |   save   |
                                     +----------+    +----------+

Lets work through the config saving first

lets have projector take care of saving.

import fs from "fs";

// ..

class Projector {
    // ...
    save() {
        fs.writeFileSync(this.config.config, JSON.stringify(this.data));
    }

    // ...
}

The main file

I tend to like to do all the linking / printing / saving / whatever is "harder" to test in the main file. Its a personal style, you don't have to do it this way or am I recommending it as a good way to go

import { parseCLIOptions } from "./opts";
import getProjectorConfig, { Operation } from "./config"
import { Projector } from "./projector";

const config = getProjectorConfig(parseCLIOptions());
const projector = Projector.fromConfig(config);

// we need to be able to operate on operations
switch (config.operation) {
case Operation.Print:
    const value = projector.getValue(config.arguments[0]);
    if (value !== undefined) {
        console.log(value);
    }
    break;

case Operation.Add:
    projector.setValue(config.arguments[0], config.arguments[1]);
    projector.save();
    break;

case Operation.Remove:
    projector.deleteValue(config.arguments[0]);
    projector.save();
    break;
}

Onto the gophers

Have i shown you this image? Gross huh?