feat: ability to specify path for custom diagram.json

Author: urish

src/help.ts

@@ -12,6 +12,7 @@ export function cliHelp() {
       {green --expect-text} <string>      Expect the given text in the output
       {green --fail-text} <string>        Fail if the given text is found in the output
       {green --elf} <path>                ELF file to simulate (default: read from wokwi.toml)
+      {green --diagram-file} <path>       Path to the diagram.json file, relative to project root (default: diagram.json)
       {green --interactive}               Redirect stdin to the simulated serial port
       {green --scenario} <path>           Run the given scenario (yaml) file, path is relative to project root
       {green --serial-log-file} <path>    Save the serial monitor output to the given file

src/main.ts

@@ -26,6 +26,7 @@ async function main() {
       '--help': Boolean,
       '--quiet': Boolean,
       '--version': Boolean,
+      '--diagram-file': String,
       '--elf': String,
       '--expect-text': String,
       '--fail-text': String,
@@ -48,6 +49,7 @@ async function main() {
   const expectText = args['--expect-text'];
   const failText = args['--fail-text'];
   const interactive = args['--interactive'];
+  const diagramFile = args['--diagram-file'];
   const serialLogFile = args['--serial-log-file'];
   const scenarioFile = args['--scenario'];
   const timeout = args['--timeout'] ?? 30000;
@@ -76,16 +78,16 @@ async function main() {
   }
 
   const rootDir = args._[0] || '.';
-  const configPath = `${rootDir}/wokwi.toml`;
-  const diagramFile = `${rootDir}/diagram.json`;
+  const configPath = path.join(rootDir, 'wokwi.toml');
+  const diagramFilePath = path.join(rootDir, diagramFile ?? 'diagram.json');
   const configExists = existsSync(configPath);
 
   if (!elf && !configExists) {
     console.error(`Error: wokwi.toml not found in ${path.resolve(rootDir)}`);
     process.exit(1);
   }
 
-  if (!existsSync(diagramFile)) {
+  if (!existsSync(diagramFilePath)) {
     console.error(`Error: diagram.json not found in ${path.resolve(rootDir)}`);
     process.exit(1);
   }
@@ -117,7 +119,7 @@ async function main() {
     process.exit(1);
   }
 
-  const diagram = readFileSync(diagramFile, 'utf8');
+  const diagram = readFileSync(diagramFilePath, 'utf8');
 
   const chips = loadChips(config?.chip ?? [], rootDir);