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 Build = std.build; const FileSource = std.Build.FileSource; 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"); // We should use a temporary path, but it will make the implementation of // `build.zig` more complex. const outdir = "patches/healed"; fs.cwd().makePath(outdir) catch |err| { return fail(step, "unable to make '{s}': {s}\n", .{ outdir, @errorName(err) }); }; heal(b.allocator, exercises, outdir) catch |err| { return fail(step, "unable to heal exercises: {s}\n", .{@errorName(err)}); }; { // Test that `zig build -Dn=n -Dhealed test` selects the nth exercise. const case_step = createCase(b, "case-1"); var i: usize = 0; for (exercises[0 .. exercises.len - 1]) |ex| { i += 1; if (ex.skip) continue; const cmd = b.addSystemCommand( &.{ b.zig_exe, "build", b.fmt("-Dn={}", .{i}), "-Dhealed", "test" }, ); cmd.setName(b.fmt("zig build -D={} -Dhealed test", .{i})); cmd.expectExitCode(0); // Some exercise output has an extra space character. if (ex.check_stdout) expectStdOutMatch(cmd, ex.output) else expectStdErrMatch(cmd, ex.output); case_step.dependOn(&cmd.step); } step.dependOn(case_step); } { // Test that `zig build -Dn=n -Dhealed test` skips disabled esercises. const case_step = createCase(b, "case-2"); var i: usize = 0; for (exercises[0 .. exercises.len - 1]) |ex| { i += 1; if (!ex.skip) continue; const cmd = b.addSystemCommand( &.{ b.zig_exe, "build", b.fmt("-Dn={}", .{i}), "-Dhealed", "test" }, ); cmd.setName(b.fmt("zig build -D={} -Dhealed test", .{i})); cmd.expectExitCode(0); cmd.expectStdOutEqual(""); expectStdErrMatch(cmd, b.fmt("{s} skipped", .{ex.main_file})); case_step.dependOn(&cmd.step); } step.dependOn(case_step); } { // Test that `zig build -Dhealed` process all the exercises in order. const case_step = createCase(b, "case-3"); // TODO: when an exercise is modified, the cache is not invalidated. const cmd = b.addSystemCommand(&.{ b.zig_exe, "build", "-Dhealed" }); cmd.setName("zig build -Dhealed"); cmd.expectExitCode(0); const stderr = cmd.captureStdErr(); const verify = CheckStep.create(b, exercises, stderr, true); verify.step.dependOn(&cmd.step); case_step.dependOn(&verify.step); step.dependOn(case_step); } { // Test that `zig build -Dhealed -Dn=1 start` process all the exercises // in order. const case_step = createCase(b, "case-4"); // TODO: when an exercise is modified, the cache is not invalidated. const cmd = b.addSystemCommand( &.{ b.zig_exe, "build", "-Dhealed", "-Dn=1", "start" }, ); cmd.setName("zig build -Dhealed -Dn=1 start"); cmd.expectExitCode(0); const stderr = cmd.captureStdErr(); const verify = CheckStep.create(b, exercises, stderr, false); verify.step.dependOn(&cmd.step); case_step.dependOn(&verify.step); step.dependOn(case_step); } // Don't add the cleanup step, since it may delete outdir while a test case // is running. //const cleanup = b.addRemoveDirTree(outdir); //step.dependOn(&cleanup.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; } // Check the output of `zig build` or `zig build -Dn=1 start`. const CheckStep = struct { step: Step, exercises: []const Exercise, stderr: FileSource, has_logo: bool, pub fn create( owner: *Build, exercises: []const Exercise, stderr: FileSource, has_logo: bool, ) *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, .has_logo = has_logo, }; return self; } fn make(step: *Step, _: *std.Progress.Node) !void { const b = step.owner; const self = @fieldParentPtr(CheckStep, "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 and self.has_logo) { // Skip the logo. var buf: [80]u8 = undefined; var lineno: usize = 0; while (lineno < 8) : (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 = "PASSED:"; try check(step, exercise, expect, actual); } // Skip the exercise output. const nlines = 1 + mem.count(u8, exercise.output, "\n") + 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; } }; // A step that will fail. 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 = @fieldParentPtr(FailStep, "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 all the exercises. fn heal(allocator: Allocator, exercises: []const Exercise, outdir: []const u8) !void { const join = fs.path.join; const exercises_path = "exercises"; const patches_path = "patches/patches"; for (exercises) |ex| { const name = ex.baseName(); // Use the POSIX patch variant. 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, &.{ outdir, ex.main_file }); const argv = &.{ "patch", "-i", patch, "-o", output, file }; var child = std.process.Child.init(argv, allocator); child.stdout_behavior = .Ignore; // the POSIX standard says that stdout is not used _ = try child.spawnAndWait(); } } // // Missing functions from std.Build.RunStep // /// Adds a check for stderr match. Does not add any other checks. pub fn expectStdErrMatch(self: *RunStep, bytes: []const u8) void { const new_check: RunStep.StdIo.Check = .{ .expect_stderr_match = self.step.owner.dupe(bytes), }; self.addCheck(new_check); } /// Adds a check for stdout match as well as a check for exit code 0, if /// there is not already an expected termination check. pub fn expectStdOutMatch(self: *RunStep, bytes: []const u8) void { const new_check: RunStep.StdIo.Check = .{ .expect_stdout_match = self.step.owner.dupe(bytes), }; self.addCheck(new_check); if (!self.hasTermCheck()) { self.expectExitCode(0); } }