Added line numbers to prompt, simple GPA setup in main

README.md

@@ -0,0 +1,15 @@
+# topiku
+topiku is a simple [LISP](https://en.wikipedia.org/wiki/Lisp_(programming_language)) inspired language with [toki pona](https://tokipona.org/) keywords
+
+### Name
+The name `topiku` was created as short form of `toki pi kulupu ijo` - language of lists, but it was also retroactively expanded into `toki epiku` - the epic language.
+
+## Building
+To build `topiku` interpreter you need a [Zig](https://ziglang.org/) compiler (works with `master`) and [`editline`](https://github.com/troglobit/editline) installed.
+```sh
+> git clone https://git.ablecorp.us:443/der-teufel-programming/topiku.git
+> cd topiku
+> zig build
+```
+The executable is then found as `zig-out/bin/topiku`
+It is also possible to build and run using `zig build run` command.

src/main.zig

@@ -3,16 +3,23 @@ const prompt = @import("prompt.zig");
 
 pub fn main() anyerror!void {
     const stdout = std.io.getStdOut().writer();
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+
+    defer {
+        var notclear = gpa.deinit();
+        if (notclear) {
+            std.log.err("Detected memory leaks!!!", .{});
+        }
+    }
+
     try stdout.writeAll("topiku - toki pi kulupu ijo - ver. 0.0.1\n");
 
     prompt.init();
     defer prompt.deinit();
 
     while (true) {
-        
         var input = prompt.readline("topiku> ") orelse break;
-        defer std.c.free(&input);
-
-        try stdout.print(">>> {s}\n", .{input});
+        defer prompt.free(input);
+        try stdout.print("<{}>: {s}\n", .{ input.num, input.content });
     }
 }

src/prompt.zig

@@ -5,17 +5,39 @@ const ceditline = @cImport({
 const std = @import("std");
 const io = std.io;
 
-pub fn readline(prompt: [*c]const u8) ?[]u8 {
-    var line = ceditline.readline(@as([*c]const u8, prompt));
+const __sighandler = ?fn (c_int) callconv(.C) void;
+extern fn signal(sig: c_int, handler: __sighandler) __sighandler;
+
+var line_num: usize = 0;
+
+pub const Line = struct {
+    content: []u8,
+    num: usize,
+};
+
+pub fn readline(prompt: []const u8) ?Line {
+    var line = ceditline.readline(@as([*c]const u8, prompt.ptr));
     if (line == 0) {
         std.c.free(line);
         return null;
     }
-    return std.mem.sliceTo(line, 0);
+    line_num += 1;
+    return Line{ .content = std.mem.sliceTo(line, 0), .num = line_num };
+}
+
+pub fn free(line: Line) void {
+    std.c.free(line.content.ptr);
 }
 
 pub fn init() void {
     ceditline.rl_initialize();
+    _ = signal(std.os.SIG.INT, exit);
+    line_num = 0;
+}
+
+fn exit(_: c_int) callconv(.C) void {
+    deinit();
+    std.os.exit(0);
 }
 
 pub fn deinit() void {