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Martin Vrhovšek
2025-02-09 19:31:27 +01:00
commit 15af4a8387
4 changed files with 289 additions and 0 deletions
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91
build.zig Normal file
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const std = @import("std");
// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) 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 optimization options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
// set a preferred release mode, allowing the user to decide how to optimize.
const optimize = b.standardOptimizeOption(.{});
// const lib = b.addStaticLibrary(.{
// .name = "todo",
// // In this case the main source file is merely a path, however, in more
// // complicated build scripts, this could be a generated file.
// .root_source_file = b.path("src/root.zig"),
// .target = target,
// .optimize = optimize,
// });
// This declares intent for the library to be installed into the standard
// location when the user invokes the "install" step (the default step when
// running `zig build`).
// b.installArtifact(lib);
const exe = b.addExecutable(.{
.name = "todo",
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
// This declares intent for the executable to be installed into the
// standard location when the user invokes the "install" step (the default
// step when running `zig build`).
b.installArtifact(exe);
// This *creates* a Run step in the build graph, to be executed when another
// step is evaluated that depends on it. The next line below will establish
// such a dependency.
const run_cmd = b.addRunArtifact(exe);
// By making the run step depend on the install step, it will be run from the
// installation directory rather than directly from within the cache directory.
// This is not necessary, however, if the application depends on other installed
// files, this ensures they will be present and in the expected location.
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
// Creates a step for unit testing. This only builds the test executable
// but does not run it.
// const lib_unit_tests = b.addTest(.{
// .root_source_file = b.path("src/root.zig"),
// .target = target,
// .optimize = optimize,
// });
// const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
const exe_unit_tests = b.addTest(.{
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
// Similar to creating the run step earlier, this exposes a `test` step to
// the `zig build --help` menu, providing a way for the user to request
// running the unit tests.
const test_step = b.step("test", "Run unit tests");
// test_step.dependOn(&run_lib_unit_tests.step);
test_step.dependOn(&run_exe_unit_tests.step);
}

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build.zig.zon Normal file
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.{
// This is the default name used by packages depending on this one. For
// example, when a user runs `zig fetch --save <url>`, this field is used
// as the key in the `dependencies` table. Although the user can choose a
// different name, most users will stick with this provided value.
//
// It is redundant to include "zig" in this name because it is already
// within the Zig package namespace.
.name = "todo",
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.0.0",
// This field is optional.
// This is currently advisory only; Zig does not yet do anything
// with this value.
//.minimum_zig_version = "0.11.0",
// This field is optional.
// Each dependency must either provide a `url` and `hash`, or a `path`.
// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
// Once all dependencies are fetched, `zig build` no longer requires
// internet connectivity.
.dependencies = .{
// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
//.example = .{
// // When updating this field to a new URL, be sure to delete the corresponding
// // `hash`, otherwise you are communicating that you expect to find the old hash at
// // the new URL.
// .url = "https://example.com/foo.tar.gz",
//
// // This is computed from the file contents of the directory of files that is
// // obtained after fetching `url` and applying the inclusion rules given by
// // `paths`.
// //
// // This field is the source of truth; packages do not come from a `url`; they
// // come from a `hash`. `url` is just one of many possible mirrors for how to
// // obtain a package matching this `hash`.
// //
// // Uses the [multihash](https://multiformats.io/multihash/) format.
// .hash = "...",
//
// // When this is provided, the package is found in a directory relative to the
// // build root. In this case the package's hash is irrelevant and therefore not
// // computed. This field and `url` are mutually exclusive.
// .path = "foo",
// // When this is set to `true`, a package is declared to be lazily
// // fetched. This makes the dependency only get fetched if it is
// // actually used.
// .lazy = false,
//},
},
// Specifies the set of files and directories that are included in this package.
// Only files and directories listed here are included in the `hash` that
// is computed for this package. Only files listed here will remain on disk
// when using the zig package manager. As a rule of thumb, one should list
// files required for compilation plus any license(s).
// Paths are relative to the build root. Use the empty string (`""`) to refer to
// the build root itself.
// A directory listed here means that all files within, recursively, are included.
.paths = .{
"build.zig",
"build.zig.zon",
"src",
// For example...
//"LICENSE",
//"README.md",
},
}

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src/file_op.zig Normal file
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const std = @import("std");
const fs = std.fs;
const FileRead = struct {
file: fs.File,
tasks: std.ArrayList([]u8),
};
pub fn readTasksFromFile(allocator: std.mem.Allocator, filename: []const u8) !FileRead {
var tasks = std.ArrayList([]u8).init(allocator);
var file = fs.cwd().openFile(filename, .{ .mode = .read_write }) catch |err| {
if (err == error.FileNotFound) {
std.debug.print("File not found: {s}\n", .{filename});
// todo needs to be closed eventually
const new_file = fs.cwd().createFile(filename, .{}) catch |e| {
std.debug.print("Failed to create the file: {}", .{e});
return e;
};
return FileRead{
.file = new_file,
.tasks = tasks,
};
} else {
std.debug.print("Failed to open the file: {s}, error: {}\n", .{ filename, err });
return err;
}
};
// wrap the file reader in a buffered reader
// since it's usually faster to read a bunch of bytes at once.
var buf_reader = std.io.bufferedReader(file.reader());
const reader = buf_reader.reader();
var line = std.ArrayList(u8).init(allocator);
defer line.deinit();
const writer = line.writer();
while (reader.streamUntilDelimiter(writer, '\n', null)) {
// clear the line so we can reuse it
defer line.clearRetainingCapacity();
const copy = try allocator.dupe(u8, line.items);
try tasks.append(copy);
} else |err| switch (err) {
error.EndOfStream => {
// end of file
if (line.items.len > 0) {
const copy = try allocator.dupe(u8, line.items);
try tasks.append(copy);
}
},
else => return err, //propagate error
}
return FileRead{ .file = file, .tasks = tasks };
}
pub fn writeTasksToFile(file_system: FileRead) !void {
for (file_system.tasks.items) |item| {
try file_system.file.writeAll(item);
try file_system.file.writeAll("\n");
}
}

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src/main.zig Normal file
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const std = @import("std");
const file_op = @import("file_op.zig");
pub fn main() !void {
const filename = "todo-db.txt";
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const allocator = gpa.allocator();
var file_res = file_op.readTasksFromFile(allocator, filename) catch |err| {
std.debug.print("Failed read or create file, exiting ...", .{});
return err;
};
defer {
for (file_res.tasks.items) |task| {
allocator.free(task);
}
file_res.tasks.deinit();
file_res.file.close();
}
std.debug.print("Reading from file:\n", .{});
for (file_res.tasks.items) |i| {
std.debug.print("{s}\n", .{i});
}
try userInteraction();
file_op.writeTasksToFile(file_res) catch |err| {
std.debug.print("Error while writing data to file:\n{}", .{err});
};
}
fn userInteraction() !void {
const stdin = std.io.getStdIn().reader();
const stdout = std.io.getStdOut().writer();
// var buf: [100]u8 = undefined;
while (true) {
try stdout.print("Please enter your choice add/remove/edit/quit: ", .{});
const bare_line = try stdin.readUntilDelimiterAlloc(std.heap.page_allocator, '\n', 8192);
defer std.heap.page_allocator.free(bare_line);
// windows legacy
const line = std.mem.trim(u8, bare_line, "\r");
std.debug.print("You entered: {s}\n", .{line});
const Case = enum { add, edit, delete, quit };
const case = std.meta.stringToEnum(Case, line) orelse return;
switch (case) {
.add => {},
.edit => {},
.delete => {},
.quit => break,
}
//break;
}
}