Initial commit;

Readline with history, simple input-echo;
Temporary name BYOL

.gitignore

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+zig-out/
+zig-cache/

build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard release options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
+    const mode = b.standardReleaseOptions();
+
+    const exe = b.addExecutable("tokiponalisp", "src/main.zig");
+    exe.setTarget(target);
+    exe.setBuildMode(mode);
+    exe.linkLibC();
+    exe.linkSystemLibrary("libeditline");
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_tests = b.addTest("src/main.zig");
+    exe_tests.setTarget(target);
+    exe_tests.setBuildMode(mode);
+
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&exe_tests.step);
+}

src/main.zig

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+const std = @import("std");
+const prompt = @import("prompt.zig");
+
+pub fn main() anyerror!void {
+    const stdout = std.io.getStdOut().writer();
+    try stdout.writeAll("BYOL Lispy - ver. 0.0.1\n");
+
+    prompt.init();
+    defer prompt.deinit();
+
+    while (true) {
+        
+        var input = prompt.readline("BYOL> ") orelse break;
+        defer std.c.free(&input);
+
+        try stdout.print("Echo> {s}\n", .{input});
+    }
+}

src/prompt.zig

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+const ceditline = @cImport({
+    @cInclude("stdio.h");
+    @cInclude("editline.h");
+});
+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));
+    if (line == 0) {
+        std.c.free(line);
+        return null;
+    }
+    return std.mem.sliceTo(line, 0);
+}
+
+pub fn init() void {
+    ceditline.rl_initialize();
+}
+
+pub fn deinit() void {
+    ceditline.rl_uninitialize();
+}