chore: Split CLI index into multiple files (#2762)

* fix lint errors

* remove gratuitous lodash from test.ts

* resolve lint issues in index

* split CLIOptions interface to own file

* split cli options, inference, option definitions, utils to own files

* split sources to own file

* move input, usage to own file

* move quicktype options to own file

* ♻️

Author: inferrinizzard

src/CLIOptions.types.ts

@@ -0,0 +1,32 @@
+import type { LanguageName, RendererOptions } from "quicktype-core";
+
+export interface CLIOptions<Lang extends LanguageName = LanguageName> {
+    // We use this to access the inference flags
+    // biome-ignore lint/suspicious/noExplicitAny: <explanation>
+    [option: string]: any;
+    additionalSchema: string[];
+    allPropertiesOptional: boolean;
+    alphabetizeProperties: boolean;
+    buildMarkovChain?: string;
+    debug?: string;
+    graphqlIntrospect?: string;
+    graphqlSchema?: string;
+    help: boolean;
+    httpHeader?: string[];
+    httpMethod?: string;
+    lang: Lang;
+
+    noRender: boolean;
+    out?: string;
+    quiet: boolean;
+
+    rendererOptions: RendererOptions<Lang>;
+
+    src: string[];
+    srcLang: string;
+    srcUrls?: string;
+    telemetry?: string;
+    topLevel: string;
+
+    version: boolean;
+}

src/cli.options.ts

@@ -0,0 +1,126 @@
+import { exceptionToString } from "@glideapps/ts-necessities";
+import {
+    // biome-ignore lint/suspicious/noShadowRestrictedNames: <explanation>
+    hasOwnProperty,
+} from "collection-utils";
+import commandLineArgs from "command-line-args";
+import _ from "lodash";
+
+import {
+    type OptionDefinition,
+    type RendererOptions,
+    type TargetLanguage,
+    assert,
+    defaultTargetLanguages,
+    getTargetLanguage,
+    isLanguageName,
+    messageError,
+} from "quicktype-core";
+
+import { inferCLIOptions } from "./inference";
+import { makeOptionDefinitions } from "./optionDefinitions";
+import type { CLIOptions } from "./CLIOptions.types";
+
+// Parse the options in argv and split them into global options and renderer options,
+// according to each option definition's `renderer` field.  If `partial` is false this
+// will throw if it encounters an unknown option.
+function parseOptions(
+    definitions: OptionDefinition[],
+    argv: string[],
+    partial: boolean,
+): Partial<CLIOptions> {
+    let opts: commandLineArgs.CommandLineOptions;
+    try {
+        opts = commandLineArgs(
+            definitions.map((def) => ({
+                ...def,
+                type: def.optionType === "boolean" ? Boolean : String,
+            })),
+            { argv, partial },
+        );
+    } catch (e) {
+        assert(!partial, "Partial option parsing should not have failed");
+        return messageError("DriverCLIOptionParsingFailed", {
+            message: exceptionToString(e),
+        });
+    }
+
+    for (const k of Object.keys(opts)) {
+        if (opts[k] === null) {
+            return messageError("DriverCLIOptionParsingFailed", {
+                message: `Missing value for command line option "${k}"`,
+            });
+        }
+    }
+
+    const options: {
+        [key: string]: unknown;
+        rendererOptions: RendererOptions;
+    } = { rendererOptions: {} };
+    for (const optionDefinition of definitions) {
+        if (!hasOwnProperty(opts, optionDefinition.name)) {
+            continue;
+        }
+
+        const optionValue = opts[optionDefinition.name] as string;
+        if (optionDefinition.kind !== "cli") {
+            (
+                options.rendererOptions as Record<
+                    typeof optionDefinition.name,
+                    unknown
+                >
+            )[optionDefinition.name] = optionValue;
+        } else {
+            const k = _.lowerFirst(
+                optionDefinition.name.split("-").map(_.upperFirst).join(""),
+            );
+            options[k] = optionValue;
+        }
+    }
+
+    return options;
+}
+
+export function parseCLIOptions(
+    argv: string[],
+    inputTargetLanguage?: TargetLanguage,
+): CLIOptions {
+    if (argv.length === 0) {
+        return inferCLIOptions({ help: true }, inputTargetLanguage);
+    }
+
+    const targetLanguages = inputTargetLanguage
+        ? [inputTargetLanguage]
+        : defaultTargetLanguages;
+    const optionDefinitions = makeOptionDefinitions(targetLanguages);
+
+    // We can only fully parse the options once we know which renderer is selected,
+    // because there are renderer-specific options.  But we only know which renderer
+    // is selected after we've parsed the options.  Hence, we parse the options
+    // twice.  This is the first parse to get the renderer:
+    const incompleteOptions = inferCLIOptions(
+        parseOptions(optionDefinitions, argv, true),
+        inputTargetLanguage,
+    );
+
+    let targetLanguage = inputTargetLanguage as TargetLanguage;
+    if (inputTargetLanguage === undefined) {
+        const languageName = isLanguageName(incompleteOptions.lang)
+            ? incompleteOptions.lang
+            : "typescript";
+        targetLanguage = getTargetLanguage(languageName);
+    }
+
+    const rendererOptionDefinitions =
+        targetLanguage.cliOptionDefinitions.actual;
+    // Use the global options as well as the renderer options from now on:
+    const allOptionDefinitions = _.concat(
+        optionDefinitions,
+        rendererOptionDefinitions,
+    );
+    // This is the parse that counts:
+    return inferCLIOptions(
+        parseOptions(allOptionDefinitions, argv, false),
+        targetLanguage,
+    );
+}