Find files that have been modified in the last 24 hours

Gets the current working directory by calling fs.cwd(), and then iterates files using walk(), which will recursively iterate entries in the directory.

For each entry, we check if it's a file, and use statFile() to retrieve the file's metadata.

//! Find files that have been modified in the last 24 hours

const std = @import("std");
const builtin = @import("builtin");
const fs = std.fs;
const print = std.debug.print;

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();
    const allocator = gpa.allocator();

    var iter_dir = try fs.cwd().openDir("src", .{ .iterate = true });
    defer iter_dir.close();

    var walker = try iter_dir.walk(allocator);
    defer walker.deinit();

    const now = std.time.nanoTimestamp();
    while (try walker.next()) |entry| {
        if (entry.kind != .file) {
            continue;
        }

        const stat = try iter_dir.statFile(entry.path);
        const last_modified = stat.mtime;
        const duration = now - last_modified;
        if (duration < std.time.ns_per_hour * 24) {
            print("Last modified: {d} seconds ago, size:{d} bytes, filename: {s}\n", .{
                @divTrunc(duration, std.time.ns_per_s),
                stat.size,
                entry.path,
            });
        }
    }
}