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* ArgParser
* Parses command-line arguments using yargs
*/
import yargs from "yargs";
import { hideBin } from "yargs/helpers";
import ConfigPrinter from "./ConfigPrinter";
import IParsedArgs from "./types/IParsedArgs";
/**
* Interface for yargs parsed result
*/
interface IYargsResult {
_: (string | number)[];
o?: string;
output?: string;
"header-out"?: string;
"base-path"?: string;
cpp: boolean;
include: string[];
target?: string;
D: string[];
parse: boolean;
clean: boolean;
config: boolean;
verbose: boolean;
debug: boolean;
preprocess: boolean;
cache: boolean;
"pio-install": boolean;
"pio-uninstall": boolean;
serve: boolean;
}
/**
* Configure yargs with all options
*/
function configureYargs(args: string[], argv: string[]) {
return (
yargs(args)
.scriptName("cnext")
.usage(
`Usage:
cnext <file.cnx> Single file (outputs file.c)
cnext <file.cnx> -o <output.c> Single file with explicit output
cnext <files...> -o <dir> Multi-file mode
cnext <dir> Directory mode (recursive)
A safer C for embedded systems development.`,
)
// Output options
.option("o", {
alias: "output",
type: "string",
describe: "Output file or directory (default: same dir as input)",
requiresArg: true,
})
.option("header-out", {
type: "string",
describe: "Output directory for header files",
requiresArg: true,
})
.option("base-path", {
type: "string",
describe:
"Strip path prefix from header output (use with --header-out)",
requiresArg: true,
})
// Compilation options
.option("cpp", {
type: "boolean",
describe: "Output .cpp instead of .c (for C++ features like Serial)",
default: false,
})
.option("include", {
type: "string",
array: true,
describe: "Additional include directory (can repeat)",
requiresArg: true,
default: [] as string[],
})
.option("target", {
type: "string",
describe: "Target platform for atomic code gen (ADR-049)",
requiresArg: true,
})
.option("D", {
type: "string",
array: true,
describe: "Define preprocessor macro",
default: [] as string[],
})
// Mode flags
.option("parse", {
type: "boolean",
describe: "Parse only, don't generate code",
default: false,
})
.option("clean", {
type: "boolean",
describe: "Delete generated files for all .cnx sources",
default: false,
})
.option("config", {
type: "boolean",
describe: "Show effective configuration and exit",
default: false,
})
// Debug/development options
.option("verbose", {
type: "boolean",
describe: "Show include path discovery",
default: false,
})
.option("debug", {
type: "boolean",
describe: "Generate panic-on-overflow helpers (ADR-044)",
default: false,
})
.option("preprocess", {
type: "boolean",
describe:
"Run C preprocessor on headers (use --no-preprocess to disable)",
default: true,
})
.option("cache", {
type: "boolean",
describe: "Enable symbol cache (use --no-cache to disable)",
default: true,
})
// PlatformIO integration
.option("pio-install", {
type: "boolean",
describe: "Setup PlatformIO integration",
default: false,
})
.option("pio-uninstall", {
type: "boolean",
describe: "Remove PlatformIO integration",
default: false,
})
// Server mode
.option("serve", {
type: "boolean",
describe: "Start JSON-RPC server on stdin/stdout",
default: false,
})
// Config file documentation (shown in help)
.epilogue(
`Examples:
cnext main.cnx # Outputs main.c (same dir)
cnext main.cnx -o build/main.c # Explicit output path
cnext src/*.cnx -o build/ # Multiple files to directory
cnext src/ # Compile all .cnx files in src/ (recursive)
Target platforms: teensy41, cortex-m7, cortex-m4, cortex-m3, cortex-m0+, cortex-m0, avr
Config files (searched in order, JSON format):
cnext.config.json, .cnext.json, .cnextrc
Config options:
cppRequired Output .cpp instead of .c (boolean)
noCache Disable symbol caching (boolean)
include Additional include directories (string[])
output Output directory for generated files (string)
headerOut Separate directory for header files (string)
target Target platform for atomic code gen (string)
debugMode Generate panic-on-overflow helpers (boolean)`,
)
// Version from package.json
.version(
"version",
"Show version",
`cnext v${ConfigPrinter.getVersion()}`,
)
.alias("version", "v")
// Help
.help("help")
.alias("help", "h")
// Strict mode - reject unknown options (but allow positional args)
.strictOptions()
// Fail handler for unknown options
.fail((msg, err, yargsInstance) => {
Iif (err) throw err;
// Check for -I flag (common GCC mistake)
const hasIFlag = argv.some((arg) => arg.startsWith("-I"));
if (hasIFlag) {
console.error("Error: Unknown flag '-I...'");
console.error(" Did you mean: --include <dir>");
console.error("");
console.error("Example:");
console.error(" cnext src --include path/to/headers");
process.exit(1);
}
console.error(msg);
console.error("");
yargsInstance.showHelp();
process.exit(1);
})
);
}
/**
* Parse command-line arguments using yargs
*/
class ArgParser {
/**
* Parse command-line arguments into a structured object
* @param argv - Command-line arguments (typically process.argv)
* @returns Parsed arguments object
*/
static parse(argv: string[]): IParsedArgs {
const args = hideBin(argv);
// Show help and exit 0 when no arguments provided
if (args.length === 0) {
configureYargs([], argv).showHelp("log"); // Output to stdout, not stderr
process.exit(0);
}
const parsed = configureYargs(args, argv).parseSync() as IYargsResult;
// Parse -D defines into a record
const defines: Record<string, string | boolean> = {};
for (const define of parsed.D) {
const eqIndex = define.indexOf("=");
if (eqIndex > 0) {
defines[define.slice(0, eqIndex)] = define.slice(eqIndex + 1);
} else {
defines[define] = true;
}
}
// Get input files from positional args (everything that isn't an option)
const inputFiles = parsed._.map(String);
return {
inputFiles,
outputPath: parsed.o ?? "",
includeDirs: parsed.include,
defines,
cppRequired: parsed.cpp,
target: parsed.target,
preprocess: parsed.preprocess,
verbose: parsed.verbose,
noCache: !parsed.cache,
parseOnly: parsed.parse,
headerOutDir: parsed["header-out"],
basePath: parsed["base-path"],
cleanMode: parsed.clean,
showConfig: parsed.config,
pioInstall: parsed["pio-install"],
pioUninstall: parsed["pio-uninstall"],
debugMode: parsed.debug,
serveMode: parsed.serve,
};
}
}
export default ArgParser;
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