Added line numbers to prompt, simple GPA setup in main

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 prompt.free(input);
-        
-        try stdout.print(">>> {s}\n", .{input});
+        try stdout.print("<{}>: {s}\n", .{ input.num, input.content });
     }
 }

src/prompt.zig

@@ -8,25 +8,34 @@ const io = std.io;
 const __sighandler = ?fn (c_int) callconv(.C) void;
 extern fn signal(sig: c_int, handler: __sighandler) __sighandler;
 
-pub fn readline(prompt: []const u8) ?[]u8 {
+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(slice: []u8) void {
-    std.c.free(slice.ptr);
+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 {
+fn exit(_: c_int) callconv(.C) void {
     deinit();
     std.os.exit(0);
 }