bun.sh/misctools/readlink-getfd.zig

const std = @import("std");

const path_handler = @import("../src/resolver/resolve_path.zig");
usingnamespace @import("../src/global.zig");

// zig build-exe -Drelease-fast --main-pkg-path ../ ./readlink-getfd.zig
pub fn main() anyerror!void {
    var stdout_ = std.io.getStdOut();
    var stderr_ = std.io.getStdErr();
    var output_source = Output.Source.init(stdout_, stderr_);
    Output.Source.set(&output_source);
    defer Output.flush();

    var args_buffer: [8096 * 2]u8 = undefined;
    var fixed_buffer = std.heap.FixedBufferAllocator.init(&args_buffer);
    var allocator = &fixed_buffer.allocator;

    var args = std.mem.span(try std.process.argsAlloc(allocator));

    const to_resolve = args[args.len - 1];
    const cwd = try std.process.getCwdAlloc(allocator);
    var parts = [1][]const u8{std.mem.span(to_resolve)};
    var joined_buf: [std.fs.MAX_PATH_BYTES]u8 = undefined;
    var joined = path_handler.joinAbsStringBuf(
        cwd,
        &joined_buf,
        &parts,
        .loose,
    );
    joined_buf[joined.len] = 0;
    const joined_z: [:0]const u8 = joined_buf[0..joined.len :0];

    var file = std.fs.openFileAbsoluteZ(joined_z, .{ .read = false }) catch |err| {
        switch (err) {
            error.NotDir, error.FileNotFound => {
                Output.prettyError("<r><red>404 Not Found<r>: <b>\"{s}\"<r>", .{joined_z});
                Output.flush();
                std.process.exit(1);
            },
            else => {
                return err;
            },
        }
    };

    var out_buffer: [std.fs.MAX_PATH_BYTES]u8 = undefined;
    var path = try std.os.getFdPath(file.handle, &out_buffer);

    Output.print("{s}", .{path});
}