add/remove/edit functionality added

src/file_op.zig

@@ -53,13 +53,17 @@ pub fn readTasksFromFile(allocator: std.mem.Allocator, filename: []const u8) !Fi
         },
         else => return err, //propagate error
     }
-
     return FileRead{ .file = file, .tasks = tasks };
 }
 
 pub fn writeTasksToFile(file_system: FileRead) !void {
+    try file_system.file.setEndPos(0);
+    try file_system.file.seekTo(0);
+
     for (file_system.tasks.items) |item| {
-        try file_system.file.writeAll(item);
+        std.debug.print("{s}\n", .{item});
+        const clean_item = std.mem.trimLeft(u8, item, &[_]u8{0});
+        try file_system.file.writeAll(clean_item);
         try file_system.file.writeAll("\n");
     }
 }

src/interaction.zig

@@ -16,7 +16,7 @@ pub fn userInteraction(allocator: std.mem.Allocator, tasks: *std.ArrayList([]con
         defer allocator.free(input);
         std.debug.print("You entered: {s}\n", .{input});
 
-        const Case = enum { add, edit, delete, quit };
+        const Case = enum { add, edit, remove, quit };
         const case = std.meta.stringToEnum(Case, input) orelse return;
 
         switch (case) {
@@ -32,8 +32,44 @@ pub fn userInteraction(allocator: std.mem.Allocator, tasks: *std.ArrayList([]con
                     std.debug.print("Failed to add the specified task:\n{}\n", .{err});
                 };
             },
-            .edit => {},
-            .delete => {},
+            .edit => {
+                try stdout.print("Please enter task name: ", .{});
+                const task_name = getInput(allocator) catch |err| {
+                    std.debug.print("Error acquiring input:\n{}\n", .{err});
+                    continue;
+                };
+                defer allocator.free(task_name);
+
+                const id = getTaskIndex(tasks, task_name) catch {
+                    std.debug.print("Invalid task name...", .{});
+                    continue;
+                };
+                try stdout.print("Please enter new task name: ", .{});
+                const new_task_name = try getInput(allocator);
+                defer allocator.free(new_task_name);
+
+                const new_task_item = try allocator.dupe(u8, new_task_name);
+                // free existing memory alloc
+                allocator.free(tasks.items[id]);
+                tasks.items[id] = new_task_item;
+            },
+            .remove => {
+                try stdout.print("Please enter task name: ", .{});
+                const task_name = getInput(allocator) catch |err| {
+                    std.debug.print("Error acquiring input:\n{}\n", .{err});
+                    continue;
+                };
+                defer allocator.free(task_name);
+
+                const id = getTaskIndex(tasks, task_name) catch {
+                    std.debug.print("Invalid task name...", .{});
+                    continue;
+                };
+
+                // free existing memory alloc
+                allocator.free(tasks.items[id]);
+                _ = tasks.orderedRemove(id);
+            },
             .quit => break,
         }
     }
@@ -47,7 +83,7 @@ fn getInput(allocator: std.mem.Allocator) ![]const u8 {
     return std.mem.trim(u8, bare_line, "\r");
 }
 
-fn getTaskIndex(tasks: *std.ArrayList([]u8), task_name: []u8) !usize {
+fn getTaskIndex(tasks: *std.ArrayList([]const u8), task_name: []const u8) !usize {
     for (tasks.items, 0..) |value, i| {
         if (std.mem.eql(u8, task_name, value)) {
             return i;

src/main.zig

@@ -26,7 +26,6 @@ pub fn main() !void {
         std.debug.print("{s}\n", .{i});
     }
 
-    // todo push allocator in
     user_int.userInteraction(allocator, &file_res.tasks) catch |err| {
         std.debug.print("User Interaction error:\n{}\n", .{err});
         return err;