fix: resolve shell script escaping and variable export issues

- Fix shell script over-escaping in code node generator for /bin/bash -c commands
- Preserve shell syntax like ${VAR:-default} in bash scripts
- Add export to set_var function for subshell variable access
- Fix circuit-breaker-template unbound variable by not escaping shell parameter expansion
- Improve debug logging to show export status

Author: Tom Brandenburg

src/generation/generators/code-node.ts

@@ -72,10 +72,22 @@ export class CodeNodeGenerator extends BaseNodeGenerator {
     let fullCommand = this.processTemplateVariablesForSubshell(String(command), node.id);
 
     if (Array.isArray(args) && args.length > 0) {
+      // Special handling for shell interpreters with script arguments
+      const isShellCommand = String(command).includes('bash') || String(command).includes('sh');
+      const stringArgs = args.map(arg => String(arg));
+      const hasCFlag = stringArgs.includes('-c');
+
       // Process each argument for subshell context
-      const processedArgs = args.map(arg => {
+      const processedArgs = args.map((arg, index) => {
         const argStr = String(arg);
         const processed = this.processTemplateVariablesForSubshell(argStr, node.id);
+
+        // Don't escape shell script content for bash -c commands
+        if (isShellCommand && hasCFlag && index > 0 && stringArgs[index - 1] === '-c') {
+          // This is a shell script - preserve shell syntax by not escaping
+          return `"${processed}"`;
+        }
+
         // Quote arguments that might contain spaces or special chars
         if (this.needsQuoting(processed)) {
           const escaped = this.escapeShellValueSmart(processed);

src/generation/shell-generator.ts

@@ -325,12 +325,13 @@ set_var() {
     local value="$2" 
     local node_id="\${3:-root}"
     
-    # Set the variable globally
+    # Set the variable globally and export it for subshells
     declare -g "$var_name"="$value"
+    export "$var_name"
     
     # Debug logging when FLOWSH_DEBUG=true
     if [[ "\${FLOWSH_DEBUG:-false}" == "true" ]]; then
-        echo "[DEBUG] $node_id: SET $var_name = '$value'" >&2
+        echo "[DEBUG] $node_id: SET $var_name = '$value' (exported)" >&2
     fi
 }