const std = @import("std"); const root = @import("../build.zig"); const debug = std.debug; const fmt = std.fmt; const fs = std.fs; const mem = std.mem; const Allocator = std.mem.Allocator; const Child = std.process.Child; const Build = std.Build; const LazyPath = std.Build.LazyPath; const Reader = fs.File.Reader; const RunStep = std.Build.RunStep; const Step = Build.Step; const Exercise = root.Exercise; pub fn addCliTests(b: *std.Build, exercises: []const Exercise) *Step { const step = b.step("test-cli", "Test the command line interface"); { // Test that `zig build -Dhealed -Dn=n` selects the nth exercise. const case_step = createCase(b, "case-1"); const tmp_path = makeTempPath(b) catch |err| { return fail(step, "unable to make tmp path: {s}\n", .{@errorName(err)}); }; const heal_step = HealStep.create(b, exercises, tmp_path); for (exercises[0 .. exercises.len - 1]) |ex| { const n = ex.number(); const cmd = b.addSystemCommand(&.{ b.graph.zig_exe, "build", "-Dhealed", b.fmt("-Dhealed-path={s}", .{tmp_path}), b.fmt("-Dn={}", .{n}), }); cmd.setName(b.fmt("zig build -Dhealed -Dn={}", .{n})); cmd.expectExitCode(0); cmd.step.dependOn(&heal_step.step); const stderr = cmd.captureStdErr(); const verify = CheckNamedStep.create(b, ex, stderr); verify.step.dependOn(&cmd.step); case_step.dependOn(&verify.step); } const cleanup = b.addRemoveDirTree(tmp_path); cleanup.step.dependOn(case_step); step.dependOn(&cleanup.step); } { // Test that `zig build -Dhealed` processes all the exercises in order. const case_step = createCase(b, "case-2"); const tmp_path = makeTempPath(b) catch |err| { return fail(step, "unable to make tmp path: {s}\n", .{@errorName(err)}); }; const heal_step = HealStep.create(b, exercises, tmp_path); heal_step.step.dependOn(case_step); // TODO: when an exercise is modified, the cache is not invalidated. const cmd = b.addSystemCommand(&.{ b.graph.zig_exe, "build", "-Dhealed", b.fmt("-Dhealed-path={s}", .{tmp_path}), }); cmd.setName("zig build -Dhealed"); cmd.expectExitCode(0); cmd.step.dependOn(&heal_step.step); const stderr = cmd.captureStdErr(); const verify = CheckStep.create(b, exercises, stderr); verify.step.dependOn(&cmd.step); const cleanup = b.addRemoveDirTree(tmp_path); cleanup.step.dependOn(&verify.step); step.dependOn(&cleanup.step); } { // Test that `zig build -Dn=n` prints the hint. const case_step = createCase(b, "case-3"); for (exercises[0 .. exercises.len - 1]) |ex| { if (ex.skip) continue; if (ex.hint) |hint| { const n = ex.number(); const cmd = b.addSystemCommand(&.{ b.graph.zig_exe, "build", b.fmt("-Dn={}", .{n}), }); cmd.setName(b.fmt("zig build -Dn={}", .{n})); cmd.expectExitCode(2); cmd.addCheck(.{ .expect_stderr_match = hint }); case_step.dependOn(&cmd.step); } } step.dependOn(case_step); } return step; } fn createCase(b: *Build, name: []const u8) *Step { const case_step = b.allocator.create(Step) catch @panic("OOM"); case_step.* = Step.init(.{ .id = .custom, .name = name, .owner = b, }); return case_step; } /// Checks the output of `zig build -Dn=n`. const CheckNamedStep = struct { step: Step, exercise: Exercise, stderr: LazyPath, pub fn create(owner: *Build, exercise: Exercise, stderr: LazyPath) *CheckNamedStep { const self = owner.allocator.create(CheckNamedStep) catch @panic("OOM"); self.* = .{ .step = Step.init(.{ .id = .custom, .name = "check-named", .owner = owner, .makeFn = make, }), .exercise = exercise, .stderr = stderr, }; return self; } fn make(step: *Step, _: std.Progress.Node) !void { const b = step.owner; const self: *CheckNamedStep = @alignCast(@fieldParentPtr("step", step)); const ex = self.exercise; const stderr_file = try fs.cwd().openFile( self.stderr.getPath(b), .{ .mode = .read_only }, ); defer stderr_file.close(); const stderr = stderr_file.reader(); { // Skip the logo. const nlines = mem.count(u8, root.logo, "\n"); var buf: [80]u8 = undefined; var lineno: usize = 0; while (lineno < nlines) : (lineno += 1) { _ = try readLine(stderr, &buf); } } try check_output(step, ex, stderr); } }; /// Checks the output of `zig build`. const CheckStep = struct { step: Step, exercises: []const Exercise, stderr: LazyPath, pub fn create( owner: *Build, exercises: []const Exercise, stderr: LazyPath, ) *CheckStep { const self = owner.allocator.create(CheckStep) catch @panic("OOM"); self.* = .{ .step = Step.init(.{ .id = .custom, .name = "check", .owner = owner, .makeFn = make, }), .exercises = exercises, .stderr = stderr, }; return self; } fn make(step: *Step, _: std.Progress.Node) !void { const b = step.owner; const self: *CheckStep = @alignCast(@fieldParentPtr("step", step)); const exercises = self.exercises; const stderr_file = try fs.cwd().openFile( self.stderr.getPath(b), .{ .mode = .read_only }, ); defer stderr_file.close(); const stderr = stderr_file.reader(); for (exercises) |ex| { if (ex.number() == 1) { // Skip the logo. const nlines = mem.count(u8, root.logo, "\n"); var buf: [80]u8 = undefined; var lineno: usize = 0; while (lineno < nlines) : (lineno += 1) { _ = try readLine(stderr, &buf); } } try check_output(step, ex, stderr); } } }; fn check_output(step: *Step, exercise: Exercise, reader: Reader) !void { const b = step.owner; var buf: [1024]u8 = undefined; if (exercise.skip) { { const actual = try readLine(reader, &buf) orelse "EOF"; const expect = b.fmt("Skipping {s}", .{exercise.main_file}); try check(step, exercise, expect, actual); } { const actual = try readLine(reader, &buf) orelse "EOF"; try check(step, exercise, "", actual); } return; } { const actual = try readLine(reader, &buf) orelse "EOF"; const expect = b.fmt("Compiling {s}...", .{exercise.main_file}); try check(step, exercise, expect, actual); } { const actual = try readLine(reader, &buf) orelse "EOF"; const expect = b.fmt("Checking {s}...", .{exercise.main_file}); try check(step, exercise, expect, actual); } { const actual = try readLine(reader, &buf) orelse "EOF"; const expect = switch (exercise.kind) { .exe => "PASSED:", .@"test" => "PASSED", }; try check(step, exercise, expect, actual); } // Skip the exercise output. const nlines = switch (exercise.kind) { .exe => 1 + mem.count(u8, exercise.output, "\n") + 1, .@"test" => 1, }; var lineno: usize = 0; while (lineno < nlines) : (lineno += 1) { _ = try readLine(reader, &buf) orelse @panic("EOF"); } } fn check( step: *Step, exercise: Exercise, expect: []const u8, actual: []const u8, ) !void { if (!mem.eql(u8, expect, actual)) { return step.fail("{s}: expected to see \"{s}\", found \"{s}\"", .{ exercise.main_file, expect, actual, }); } } fn readLine(reader: fs.File.Reader, buf: []u8) !?[]const u8 { if (try reader.readUntilDelimiterOrEof(buf, '\n')) |line| { return mem.trimRight(u8, line, " \r\n"); } return null; } /// Fails with a custom error message. const FailStep = struct { step: Step, error_msg: []const u8, pub fn create(owner: *Build, error_msg: []const u8) *FailStep { const self = owner.allocator.create(FailStep) catch @panic("OOM"); self.* = .{ .step = Step.init(.{ .id = .custom, .name = "fail", .owner = owner, .makeFn = make, }), .error_msg = error_msg, }; return self; } fn make(step: *Step, _: std.Progress.Node) !void { const b = step.owner; const self: *FailStep = @alignCast(@fieldParentPtr("step", step)); try step.result_error_msgs.append(b.allocator, self.error_msg); return error.MakeFailed; } }; /// A variant of `std.Build.Step.fail` that does not return an error so that it /// can be used in the configuration phase. It returns a FailStep, so that the /// error will be cleanly handled by the build runner. fn fail(step: *Step, comptime format: []const u8, args: anytype) *Step { const b = step.owner; const fail_step = FailStep.create(b, b.fmt(format, args)); step.dependOn(&fail_step.step); return step; } /// Heals the exercises. const HealStep = struct { step: Step, exercises: []const Exercise, work_path: []const u8, pub fn create(owner: *Build, exercises: []const Exercise, work_path: []const u8) *HealStep { const self = owner.allocator.create(HealStep) catch @panic("OOM"); self.* = .{ .step = Step.init(.{ .id = .custom, .name = "heal", .owner = owner, .makeFn = make, }), .exercises = exercises, .work_path = work_path, }; return self; } fn make(step: *Step, _: std.Progress.Node) !void { const b = step.owner; const self: *HealStep = @alignCast(@fieldParentPtr("step", step)); return heal(b.allocator, self.exercises, self.work_path); } }; /// Heals all the exercises. fn heal(allocator: Allocator, exercises: []const Exercise, work_path: []const u8) !void { const sep = std.fs.path.sep_str; const join = fs.path.join; const exercises_path = "exercises"; const patches_path = "patches" ++ sep ++ "patches"; for (exercises) |ex| { const name = ex.name(); const file = try join(allocator, &.{ exercises_path, ex.main_file }); const patch = b: { const patch_name = try fmt.allocPrint(allocator, "{s}.patch", .{name}); break :b try join(allocator, &.{ patches_path, patch_name }); }; const output = try join(allocator, &.{ work_path, ex.main_file }); const argv = &.{ "patch", "-i", patch, "-o", output, "-s", file }; var child = Child.init(argv, allocator); _ = try child.spawnAndWait(); } } /// This function is the same as the one in std.Build.makeTempPath, with the /// difference that returns an error when the temp path cannot be created. pub fn makeTempPath(b: *Build) ![]const u8 { const rand_int = std.crypto.random.int(u64); const tmp_dir_sub_path = "tmp" ++ fs.path.sep_str ++ Build.hex64(rand_int); const path = b.cache_root.join(b.allocator, &.{tmp_dir_sub_path}) catch @panic("OOM"); try b.cache_root.handle.makePath(tmp_dir_sub_path); return path; }