Added proc_run() and system() for processes and added to stdlib as class. (0.16.6)

examples/process_example.fun

@@ -0,0 +1,60 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-10-02
+ */
+
+/*
+ * Subprocess example using proc_run/system and the Process class.
+ */
+
+#include <io/process.fun>
+
+print("=== Built-ins ===")
+r = proc_run("echo Hello from Fun")
+print(r["out"])
+print(join(["exit code: ", to_string(r["code"])], ""))
+
+code = system("sh -c 'exit 3'")
+print(join(["system() exit code: ", to_string(code)], ""))
+
+print("=== Process class ===")
+p = Process()
+res = p.run("uname -s")
+print(join(["OS: ", res["out"]], ""))
+
+res2 = p.run_merge_stderr("sh -c 'echo out; echo err 1>&2; exit 1'")
+print("merged output:")
+print(res2["out"])
+print(join(["exit code: ", to_string(res2["code"])], ""))
+
+ok = p.check_call("true")
+print(join(["check_call(true): ", to_string(ok)], ""))
+
+ok2 = p.check_call("false")
+print(join(["check_call(false): ", to_string(ok2)], ""))
+
+/* Expected output:
+=== Built-ins ===
+Hello from Fun
+
+exit code: 0
+system() exit code: 3
+=== Process class ===
+OS: Linux
+
+merged output:
+out
+err
+
+exit code: 1
+check_call(true): 1
+check_call(false): 0
+*/