Merge pull request #4 from zigcc/0103

add 01-03

Author: jiacai2050

examples/src/01-03.zig

@@ -0,0 +1,39 @@
+//! File names that have been modified in the last 24 hours
+
+const std = @import("std");
+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().openIterableDir(".", .{
+        .no_follow = true, // `true` means it won't dereference the symlinks.
+    });
+    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 file = try iter_dir.dir.openFile(entry.path, .{});
+        const md = try file.metadata();
+        const last_modified = md.modified();
+        const duration = now - last_modified;
+        if (duration < std.time.ns_per_hour * 24) {
+            print("Last modified: {d} seconds ago, read_only:{any}, size:{d} bytes, filename: {s}\n", .{
+                @divTrunc(duration, std.time.ns_per_s),
+                md.permissions().readOnly(),
+                md.size(),
+                entry.path,
+            });
+        }
+    }
+}

src/01-03-file-modified-24h-ago.md

@@ -0,0 +1,42 @@
+# File names that have been modified in the last 24 hours
+
+```zig
+const std = @import("std");
+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().openIterableDir(".", .{
+        .no_follow = true, // `true` means it won't dereference the symlinks.
+    });
+    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 file = try iter_dir.dir.openFile(entry.path, .{});
+        const md = try file.metadata();
+        const last_modified = md.modified();
+        const duration = now - last_modified;
+        if (duration < std.time.ns_per_hour * 24) {
+            print("Last modified: {d} seconds ago, read_only:{any}, size:{d} bytes, filename: {s}\n", .{
+                @divTrunc(duration, std.time.ns_per_s),
+                md.permissions().readOnly(),
+                md.size(),
+                entry.path,
+            });
+        }
+    }
+}
+
+```

src/SUMMARY.md

@@ -5,6 +5,7 @@
 - [File System]()
   - [Read file line by line](./01-01-read-file-line-by-line.md)
   - [Mmap file](./01-02-mmap-file.md)
+  - [Find File modified in the last 24 hours](./01-03-file-modified-24h-ago.md)
 
 - [Cryptography]()
   - [Calculate SHA-256 digest of a file](./02-01-sha-digest.md)