make tui example that uses primitive TEA

examples/tui/Main.roc

@@ -0,0 +1,15 @@
+app "echo"
+    packages { pf: "platform" }
+    imports [ pf.Program.{ Program } ]
+    provides [ main ] { Model } to pf
+
+
+Model : Str
+
+main : Program Model
+main =
+    { 
+        init: \{} -> "Hello World",
+        update: \model, new -> Str.concat model new,
+        view: \model -> Str.concat model "!",
+    }

examples/tui/platform/Package-Config.roc

@@ -0,0 +1,10 @@
+platform "folkertdev/foo"
+    requires { Model } { main : Effect {} }
+    exposes []
+    packages {}
+    imports []
+    provides [ mainForHost ]
+    effects fx.Effect { }
+
+mainForHost : { init : ({} -> Model) as Init, update : (Model, Str -> Model) as Update, view : (Model -> Str) as View } 
+mainForHost = main

examples/tui/platform/Program.roc

@@ -0,0 +1,10 @@
+interface Program
+    exposes [Program]
+    imports []
+
+Program model : 
+    { 
+        init : {} -> model,
+        update : model, Str -> model,
+        view : model -> Str,
+    }

examples/tui/platform/host.zig

@@ -0,0 +1,268 @@
+const std = @import("std");
+const str = @import("str");
+const RocStr = str.RocStr;
+const testing = std.testing;
+const expectEqual = testing.expectEqual;
+const expect = testing.expect;
+const maxInt = std.math.maxInt;
+
+comptime {
+    // This is a workaround for https://github.com/ziglang/zig/issues/8218
+    // which is only necessary on macOS.
+    //
+    // Once that issue is fixed, we can undo the changes in
+    // 177cf12e0555147faa4d436e52fc15175c2c4ff0 and go back to passing
+    // -fcompiler-rt in link.rs instead of doing this. Note that this
+    // workaround is present in many host.zig files, so make sure to undo
+    // it everywhere!
+    if (std.builtin.os.tag == .macos) {
+        _ = @import("compiler_rt");
+    }
+}
+
+const mem = std.mem;
+const Allocator = mem.Allocator;
+
+const Program = extern struct { init: RocStr, update: Unit, view: Unit };
+
+extern fn roc__mainForHost_1_exposed() Program;
+extern fn roc__mainForHost_size() i64;
+
+const ConstModel = [*]const u8;
+const MutModel = [*]u8;
+
+extern fn roc__mainForHost_1_Init_caller([*]u8, [*]u8, MutModel) void;
+extern fn roc__mainForHost_1_Init_size() i64;
+extern fn roc__mainForHost_1_Init_result_size() i64;
+
+fn allocate_model(allocator: *Allocator) MutModel {
+    const size = roc__mainForHost_1_Init_result_size();
+    const raw_output = allocator.allocAdvanced(u8, @alignOf(u64), @intCast(usize, size), .at_least) catch unreachable;
+    var output = @ptrCast([*]u8, raw_output);
+
+    return output;
+}
+
+fn init(allocator: *Allocator) ConstModel {
+    const closure: [*]u8 = undefined;
+    const output = allocate_model(allocator);
+
+    roc__mainForHost_1_Init_caller(closure, closure, output);
+
+    return output;
+}
+
+extern fn roc__mainForHost_1_Update_caller(ConstModel, *const RocStr, [*]u8, MutModel) void;
+extern fn roc__mainForHost_1_Update_size() i64;
+extern fn roc__mainForHost_1_Update_result_size() i64;
+
+fn update(allocator: *Allocator, model: ConstModel, msg: RocStr) ConstModel {
+    const closure: [*]u8 = undefined;
+    const output = allocate_model(allocator);
+
+    roc__mainForHost_1_Update_caller(model, &msg, closure, output);
+
+    return output;
+}
+
+extern fn roc__mainForHost_1_View_caller(ConstModel, [*]u8, *RocStr) void;
+extern fn roc__mainForHost_1_View_size() i64;
+extern fn roc__mainForHost_1_View_result_size() i64;
+
+fn view(input: ConstModel) RocStr {
+    const closure: [*]u8 = undefined;
+    var output: RocStr = undefined;
+
+    roc__mainForHost_1_View_caller(input, closure, &output);
+
+    return output;
+}
+
+const Align = 2 * @alignOf(usize);
+extern fn malloc(size: usize) callconv(.C) ?*align(Align) c_void;
+extern fn realloc(c_ptr: [*]align(Align) u8, size: usize) callconv(.C) ?*c_void;
+extern fn free(c_ptr: [*]align(Align) u8) callconv(.C) void;
+extern fn memcpy(dst: [*]u8, src: [*]u8, size: usize) callconv(.C) void;
+extern fn memset(dst: [*]u8, value: i32, size: usize) callconv(.C) void;
+
+const DEBUG: bool = false;
+
+export fn roc_alloc(size: usize, alignment: u32) callconv(.C) ?*c_void {
+    if (DEBUG) {
+        var ptr = malloc(size);
+        const stdout = std.io.getStdOut().writer();
+        stdout.print("alloc:   {d} (alignment {d}, size {d})\n", .{ ptr, alignment, size }) catch unreachable;
+        return ptr;
+    } else {
+        return malloc(size);
+    }
+}
+
+export fn roc_realloc(c_ptr: *c_void, new_size: usize, old_size: usize, alignment: u32) callconv(.C) ?*c_void {
+    if (DEBUG) {
+        const stdout = std.io.getStdOut().writer();
+        stdout.print("realloc: {d} (alignment {d}, old_size {d})\n", .{ c_ptr, alignment, old_size }) catch unreachable;
+    }
+
+    return realloc(@alignCast(Align, @ptrCast([*]u8, c_ptr)), new_size);
+}
+
+export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
+    if (DEBUG) {
+        const stdout = std.io.getStdOut().writer();
+        stdout.print("dealloc: {d} (alignment {d})\n", .{ c_ptr, alignment }) catch unreachable;
+    }
+
+    free(@alignCast(Align, @ptrCast([*]u8, c_ptr)));
+}
+
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    _ = tag_id;
+
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
+export fn roc_memcpy(dst: [*]u8, src: [*]u8, size: usize) callconv(.C) void {
+    return memcpy(dst, src, size);
+}
+
+export fn roc_memset(dst: [*]u8, value: i32, size: usize) callconv(.C) void {
+    return memset(dst, value, size);
+}
+
+const Unit = extern struct {};
+
+pub export fn main() callconv(.C) u8 {
+    const allocator = std.heap.page_allocator;
+
+    var ts1: std.os.timespec = undefined;
+    std.os.clock_gettime(std.os.CLOCK_REALTIME, &ts1) catch unreachable;
+
+    const program = roc__mainForHost_1_exposed();
+
+    call_the_closure(program);
+
+    var ts2: std.os.timespec = undefined;
+    std.os.clock_gettime(std.os.CLOCK_REALTIME, &ts2) catch unreachable;
+
+    const delta = to_seconds(ts2) - to_seconds(ts1);
+
+    const stderr = std.io.getStdErr().writer();
+    stderr.print("runtime: {d:.3}ms\n", .{delta * 1000}) catch unreachable;
+
+    return 0;
+}
+
+fn to_seconds(tms: std.os.timespec) f64 {
+    return @intToFloat(f64, tms.tv_sec) + (@intToFloat(f64, tms.tv_nsec) / 1_000_000_000.0);
+}
+
+fn call_the_closure(program: Program) void {
+    const allocator = std.heap.page_allocator;
+    const stdout = std.io.getStdOut().writer();
+    const stdin = std.io.getStdIn().reader();
+
+    var buf: [1000]u8 = undefined;
+
+    var model = init(allocator);
+
+    while (true) {
+        const line = (stdin.readUntilDelimiterOrEof(buf[0..], '\n') catch unreachable) orelse return;
+        const to_append = RocStr.init(line.ptr, line.len);
+
+        model = update(allocator, model, to_append);
+
+        const viewed = view(model);
+        for (viewed.asSlice()) |char| {
+            stdout.print("{c}", .{char}) catch unreachable;
+        }
+
+        stdout.print("\n", .{}) catch unreachable;
+    }
+
+    // The closure returns result, nothing interesting to do with it
+    return;
+}
+
+pub export fn roc_fx_putInt(int: i64) i64 {
+    const stdout = std.io.getStdOut().writer();
+
+    stdout.print("{d}", .{int}) catch unreachable;
+
+    stdout.print("\n", .{}) catch unreachable;
+
+    return 0;
+}
+
+export fn roc_fx_putLine(rocPath: str.RocStr) callconv(.C) void {
+    const stdout = std.io.getStdOut().writer();
+
+    for (rocPath.asSlice()) |char| {
+        stdout.print("{c}", .{char}) catch unreachable;
+    }
+
+    stdout.print("\n", .{}) catch unreachable;
+}
+
+const GetInt = extern struct {
+    value: i64,
+    error_code: bool,
+    is_error: bool,
+};
+
+comptime {
+    if (@sizeOf(usize) == 8) {
+        @export(roc_fx_getInt_64bit, .{ .name = "roc_fx_getInt" });
+    } else {
+        @export(roc_fx_getInt_32bit, .{ .name = "roc_fx_getInt" });
+    }
+}
+
+fn roc_fx_getInt_64bit() callconv(.C) GetInt {
+    if (roc_fx_getInt_help()) |value| {
+        const get_int = GetInt{ .is_error = false, .value = value, .error_code = false };
+        return get_int;
+    } else |err| switch (err) {
+        error.InvalidCharacter => {
+            return GetInt{ .is_error = true, .value = 0, .error_code = false };
+        },
+        else => {
+            return GetInt{ .is_error = true, .value = 0, .error_code = true };
+        },
+    }
+
+    return 0;
+}
+
+fn roc_fx_getInt_32bit(output: *GetInt) callconv(.C) void {
+    if (roc_fx_getInt_help()) |value| {
+        const get_int = GetInt{ .is_error = false, .value = value, .error_code = false };
+        output.* = get_int;
+    } else |err| switch (err) {
+        error.InvalidCharacter => {
+            output.* = GetInt{ .is_error = true, .value = 0, .error_code = false };
+        },
+        else => {
+            output.* = GetInt{ .is_error = true, .value = 0, .error_code = true };
+        },
+    }
+
+    return;
+}
+
+fn roc_fx_getInt_help() !i64 {
+    const stdin = std.io.getStdIn().reader();
+    var buf: [40]u8 = undefined;
+
+    const line: []u8 = (try stdin.readUntilDelimiterOrEof(&buf, '\n')) orelse "";
+
+    return std.fmt.parseInt(i64, line, 10);
+}
+
+fn readLine() []u8 {
+    const stdin = std.io.getStdIn().reader();
+    return (stdin.readUntilDelimiterOrEof(&line_buf, '\n') catch unreachable) orelse "";
+}