Added user input support and many fixes. (0.16.5)

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.16)
-project(fun VERSION 0.16.4 LANGUAGES C)
+project(fun VERSION 0.16.5 LANGUAGES C)
 
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)

README.md

@@ -6,22 +6,22 @@ Fun is a highly strict programming language, but also highly simple. It looks li
 
 Influenced by Bash, **[C](https://en.wikipedia.org/wiki/The_C_Programming_Language)**, Go, **[Lua](https://www.lua.org/)**, **[Python](https://www.python.org/)**, and Rust (Most influences came from linked languages).
 
-Fun is and will ever be 100% free under the terms of the [ISC-License](https://opensource.org/license/isc-license-txt).
+Fun is and will ever be 100% free under the terms of the [Apache-2.0-License](https://opensource.org/license/apache-2-0).
 
 ## Idea
 
-* Simplicity
-* Consistency
-* Joy in coding
-* Fun!
+- Simplicity
+- Consistency
+- Joy in coding
+- Fun!
 
 ## Characteristics
 
-* Dynamic and optionally statically typed
-* Type safety
-* Written in C
-* Internal libs are written with no_camel_case even when written in Fun
-* Only a minimal function set is written in C and most other core libraries are implemented in Fun
+- Dynamic and optionally statically typed
+- Type safety
+- Written in C and Fun
+- Internal libs are written with no_camel_case even when written in Fun, except class Names
+- Only a minimal function set is written in C, and most other core functions and libraries are implemented in Fun
 
 ## The Fun Manifesto
 
@@ -65,7 +65,7 @@ Fun may not change the world — but it will make programming a little more fun.
 
 ## Documentation
 
-Actually there does not exist any documenation. In the [examples/](https://git.xw3.org/fun/fun/src/branch/main/examples){:class="git"} directory should be an example of most Fun features.
+Actually, there does not exist any documentation. In the [examples/](https://git.xw3.org/fun/fun/src/branch/main/examples) directory should be an example of most Fun features.
 
 ## Development
 
@@ -103,7 +103,7 @@ This requires Cygwin to be installed and configured. I will not cover this here.
 - Every commit message must contain the version at the end in the following format (1.2.3)
 - Version numbering follows "[Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html)"
 
-### Developement systems
+### Development systems
 
 - [GNU](https://gnu.org/)/[Linux](https://kernel.org/) ([Arch](https://archlinux.org/)/[Artix](https://artixlinux.org/), [Debian](https://www.debian.org/)) using [GCC](https://gcc.gnu.org/) and the [GNU C library](https://www.gnu.org/software/libc/) ([glibc](https://en.wikipedia.org/wiki/Glibc))
 - GNU/Linux ([Alpine](https://alpinelinux.org/)) using GCC and the [musl libc](https://musl.libc.org/)

examples/include_local.fun

@@ -14,7 +14,7 @@
 
 // Demonstrates local include:
 // This resolves relative to the current working directory where 'fun' is executed.
-#include "include_local_util.fun"
+#include "examples/include_local_util.fun"
 
 print("== include local demo ==")
 greet("Fun")

examples/input_example.fun

@@ -0,0 +1,47 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-10-02
+ */
+
+/*
+ * Interactive input example using input() and Console wrapper.
+ */
+
+#include <io/console.fun>
+
+print("=== input() builtin ===")
+name = input("Enter your name: ")
+print(join(["Hello, ", name, "!"], ""))
+
+print("=== Console class ===")
+c = Console()
+city = c.ask("Your city")
+print(join(["Nice to meet you from ", city], ""))
+
+yn = c.ask_yes_no("Do you like Fun?")
+if yn
+  print("Great! 🎉")
+else
+  print("Give it a try, it grows on you.")
+
+/* Input given:
+Enter your name: Hanez
+Your city: Universe
+Do you like Fun? [y/n]: y
+*/
+
+/* Expected output:
+=== input() builtin ===
+Hello, Hanez!
+=== Console class ===
+Nice to meet you from Universe
+Great! 🎉
+*/

examples/stdlib_showcase.fun

@@ -52,3 +52,39 @@ bytes = [0x48,0x65,0x6c,0x6c,0x6f]             // "Hello"
 b64 = b64_encode_bytes(bytes)
 print(b64)                                     // "SGVsbG8="
 print(join(b64_decode_to_bytes(b64), ","))     // "72,101,108,108,111"
+
+/* Expected output:
+=== Arrays ===
+2,2,3
+4,3,2,2,1
+3
+0
+1,2,3,4
+1,2,3,4,5
+=== Strings ===
+[Hello World]
+1
+1
+a|b|c
+baNANA
+fun
+FUN
+hahaha
+=== Math ===
+5
+10
+6
+42
+243
+2
+9
+1
+3
+=== Range ===
+0,1,2,3,4
+3,4,5,6,7
+10,7,4,1
+=== Base64 ===
+SGVsbG8=
+72,101,108,108,111
+*/

lib/io/console.fun

@@ -0,0 +1,31 @@
+/*
+ * Console utilities: prompt, ask, and yes/no helpers built on input().
+ */
+
+#include <strings.fun>
+
+class Console()
+  // Print a prompt and read a line (no trailing newline)
+  fun prompt(this, text)
+    return input(to_string(text))
+
+  // Ask a question with ": " suffix; returns the user's response string
+  fun ask(this, question)
+    q = to_string(question)
+    if (len(q) == 0)
+      return input("")
+    else
+      return input(join([q, ": "], ""))
+
+  // Ask a yes/no question; returns 1 for yes, 0 for no
+  // Accepts: y, yes, n, no (case-insensitive). Keeps asking until valid.
+  fun ask_yes_no(this, question)
+    q = to_string(question)
+    while true
+      ans = input(join([q, " [y/n]: "], ""))
+      a = str_to_lower(ans)
+      if (a == "y" || a == "yes")
+        return 1
+      else if (a == "n" || a == "no")
+        return 0
+      // otherwise loop again

src/bytecode.h

@@ -114,6 +114,7 @@ typedef enum {
 
     // OS
     OP_ENV,           // pops name string; pushes value string (or "")
+    OP_INPUT_LINE,    // operand: 0=no prompt; 1=has prompt. Pops [prompt?]; pushes input string (no trailing newline)
 
     // Threads
     OP_THREAD_SPAWN,  // operand: 0=no args, 1=has args; pops [args?], fn; pushes thread id (int>0)

src/parser.c

@@ -641,6 +641,19 @@ static int emit_primary(Bytecode *bc, const char *src, size_t len, size_t *pos)
                 free(name);
                 return 1;
             }
+            if (strcmp(name, "input") == 0) {
+                (*pos)++; /* '(' */
+                int hasPrompt = 0;
+                skip_spaces(src, len, pos);
+                if (*pos < len && src[*pos] != ')') {
+                    if (!emit_expression(bc, src, len, pos)) { parser_fail(*pos, "input expects 0 or 1 argument"); free(name); return 0; }
+                    hasPrompt = 1;
+                }
+                if (!consume_char(src, len, pos, ')')) { parser_fail(*pos, "Expected ')' after input arg(s)"); free(name); return 0; }
+                bytecode_add_instruction(bc, OP_INPUT_LINE, hasPrompt ? 1 : 0);
+                free(name);
+                return 1;
+            }
             if (strcmp(name, "env") == 0) {
                 (*pos)++; /* '(' */
                 if (!emit_expression(bc, src, len, pos)) { parser_fail(*pos, "env expects 1 argument"); free(name); return 0; }

src/vm.c

@@ -289,6 +289,7 @@ void vm_run(VM *vm, Bytecode *entry) {
 
             #include "vm/io/read_file.c"
             #include "vm/io/write_file.c"
+            #include "vm/io/input_line.c"
 
             #include "vm/logic/and.c"
             #include "vm/logic/eq.c"

src/vm.h

@@ -33,7 +33,7 @@ static const char *opcode_names[] = {
     "ENUMERATE","ZIP",
     "MIN","MAX","CLAMP","ABS","POW","RANDOM_SEED","RANDOM_INT",
     "MAKE_MAP","KEYS","VALUES","HAS_KEY",
-    "READ_FILE","WRITE_FILE","ENV",
+    "READ_FILE","WRITE_FILE","ENV","INPUT_LINE",
     "THREAD_SPAWN","THREAD_JOIN","SLEEP_MS",
     "BAND","BOR","BXOR","BNOT","SHL","SHR","ROTL","ROTR"
 };

src/vm/io/input_line.c

@@ -0,0 +1,72 @@
+case OP_INPUT_LINE: {
+    /* operand: 0 = no prompt; 1 = has prompt (string or any value convertible to string) */
+    int has_prompt = inst.operand ? 1 : 0;
+    if (has_prompt) {
+        /* pop prompt value and print without newline */
+        Value pv = pop_value(vm);
+        char *pstr = value_to_string_alloc(&pv);
+        if (pstr) {
+            fputs(pstr, stdout);
+            fflush(stdout);
+            free(pstr);
+        }
+        free_value(pv);
+    }
+
+    /* read a line from stdin, dynamically grow buffer */
+    size_t cap = 128;
+    size_t len = 0;
+    char *buf = (char*)malloc(cap);
+    if (!buf) {
+        fprintf(stderr, "Runtime error: out of memory reading input");
+        push_value(vm, make_string(""));
+        break;
+    }
+
+    int ch;
+    while ((ch = fgetc(stdin)) != EOF) {
+        if (ch == '\r') {
+            /* Handle CRLF by consuming optional following '\n' */
+            int next = fgetc(stdin);
+            if (next != EOF && next != '\n') {
+                ungetc(next, stdin);
+            }
+            break;
+        }
+        if (ch == '\n') {
+            break;
+        }
+        if (len + 1 >= cap) {
+            cap *= 2;
+            char *nb = (char*)realloc(buf, cap);
+            if (!nb) {
+                free(buf);
+                fprintf(stderr, "Runtime error: out of memory reading input");
+                push_value(vm, make_string(""));
+                goto push_done;
+            }
+            buf = nb;
+        }
+        buf[len++] = (char)ch;
+    }
+
+    /* null-terminate */
+    if (len + 1 >= cap) {
+        char *nb = (char*)realloc(buf, len + 1);
+        if (!nb) {
+            free(buf);
+            fprintf(stderr, "Runtime error: out of memory finalizing input");
+            push_value(vm, make_string(""));
+            goto push_done;
+        }
+        buf = nb;
+    }
+    buf[len] = '\0';
+
+    /* push as Fun string */
+    push_value(vm, make_string(buf));
+    free(buf);
+
+push_done:
+    break;
+}